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BoM Grass Valley Marine Weather Forecast

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Forecast for Tuesday, 15 September
Weather: Partly cloudy.
Winds: Easterly 20 to 25 knots.
Seas: 1.5 to 2 metres.
Swell: Southwesterly 2.5 to 3 metres.
Forecast for Wednesday, 16 September
Weather: Mostly sunny morning. The chance of a thunderstorm inshore in the afternoon and early evening.
Winds: Northeasterly 15 to 20 knots.
Seas: 1 to 2 metres.
Swell: Southwesterly 2 to 3 metres. Easterly around 1 metre inshore, increasing to 1 to 1.5 metres offshore during the morning.
Forecast for Thursday, 17 September
Weather: Sunny.
Winds: Northeasterly 15 to 20 knots tending northerly in the early morning then tending northwest to southwesterly 10 to 15 knots in the late afternoon.
Seas: 1 to 1.5 metres, decreasing below 1 metre around midday.
Swell: Southwesterly 1.5 to 2.5 metres. Easterly around 1 metre inshore, increasing to 1 to 1.5 metres offshore.
Forecast for Friday, 18 September
Weather: Partly cloudy. 70% chance of showers. The chance of a thunderstorm in the afternoon and evening.
Winds: West to northwesterly 10 to 15 knots tending north to northwesterly 15 to 20 knots during the morning.
Seas: Below 1 metre, increasing to 1 to 1.5 metres offshore during the afternoon or evening.
Swell: Southwesterly 1 to 1.5 metres inshore, increasing to 1.5 to 2.5 metres offshore. Easterly around 1 metre.

Forecast for Tuesday, 15 September
Weather: Sunny.
Winds: South to southeasterly 10 to 15 knots, reaching up to 20 knots offshore in the evening. Winds tending east to southeasterly in the evening.
Seas: Around 1 metre.
Swell: Southwesterly 1 to 2 metres inshore, increasing to 2 to 3 metres offshore.
Forecast for Wednesday, 16 September
Weather: Sunny morning. The chance of a thunderstorm inshore in the afternoon and early evening.
Winds: Easterly 10 to 15 knots tending northeasterly in the morning then becoming variable about 10 knots in the middle of the day.
Seas: Around 1 metre.
Swell: Southwesterly 1.5 to 2.5 metres.
Forecast for Thursday, 17 September
Weather: Partly cloudy.
Winds: East to northeasterly 10 to 15 knots turning north to northwesterly 15 to 20 knots early in the morning.
Seas: Around 1 metre.
Swell: Southwesterly 1 to 1.5 metres inshore, increasing to 1.5 to 2 metres offshore.
Forecast for Friday, 18 September
Weather: Cloudy. 95% chance of showers. The chance of a thunderstorm in the afternoon.
Winds: North to northwesterly 15 to 20 knots tending west to northwesterly 20 to 30 knots during the afternoon.
Seas: 1 to 1.5 metres, increasing to 1 to 2 metres during the morning.
Swell: Southwesterly 1.5 to 2 metres, tending westerly 1.5 to 2.5 metres during the morning.

Forecast for Tuesday, 15 September
Weather: Partly cloudy.
Winds: Easterly 20 to 25 knots.
Seas: 1.5 to 2 metres.
Swell: Southwesterly 2.5 to 3 metres.
Forecast for Wednesday, 16 September
Weather: Cloud clearing.
Winds: Northeasterly 15 to 25 knots.
Seas: 1.5 to 2 metres.
Swell: Southwesterly 2 to 3 metres. East to northeasterly around 1 metre, increasing to 1 to 1.5 metres west of Hopetoun.
Forecast for Thursday, 17 September
Weather: Sunny.
Winds: Northeasterly 15 to 25 knots turning northerly in the evening.
Seas: 1 to 2 metres, decreasing to 1 to 1.5 metres around midday, then increasing to 1 to 2 metres during the afternoon.
Swell: Southwesterly 1.5 to 2 metres, decreasing to 1.5 metres by early evening. East to northeasterly around 1 metre.
Forecast for Friday, 18 September
Weather: Partly cloudy. 50% chance of showers. The chance of a thunderstorm in the afternoon and evening.
Winds: North to northwesterly 15 to 20 knots tending northeast to southeasterly 10 to 15 knots during the day then tending north to northeasterly 15 to 20 knots during the evening.
Seas: 1 to 2 metres, decreasing to 1 metre during the morning.
Swell: Southwesterly 1.5 metres, increasing to 1 to 2 metres west of Hopetoun. Easterly around 1 metre.

Forecast for Tuesday, 15 September
Weather: Partly cloudy.
Winds: Easterly 20 to 25 knots.
Seas: 1.5 to 2 metres.
Swell: Southwesterly 2 to 2.5 metres.
Forecast for Wednesday, 16 September
Weather: Partly cloudy.
Winds: Easterly 20 to 25 knots.
Seas: 1.5 to 2 metres.
Swell: Southwesterly 2 to 2.5 metres.
Forecast for Thursday, 17 September
Weather: Sunny.
Winds: Northeasterly 15 to 25 knots.
Seas: 1.5 to 2 metres, decreasing to 1 to 1.5 metres during the morning.
Swell: Southwesterly 1.5 to 2.5 metres.
Forecast for Friday, 18 September
Weather: Sunny day. The chance of a thunderstorm in the afternoon and evening.
Winds: North to northeasterly 15 to 20 knots.
Seas: 1 to 1.5 metres.
Swell: Southwesterly 1 to 1.5 metres.

Forecast for Tuesday, 15 September
Weather: Mostly sunny.
Winds: Southerly 15 to 20 knots, reaching up to 25 knots south of Denham in the afternoon.
Seas: 1.5 metres, increasing to 1.5 to 2 metres south of Denham.
Swell: Southwesterly 2 to 3 metres.
Forecast for Wednesday, 16 September
Weather: Partly cloudy.
Winds: South to southwesterly 15 to 20 knots decreasing to about 10 knots in the late evening.
Seas: 1 to 1.5 metres, decreasing below 1 metre during the morning.
Swell: Southwesterly 2 to 3 metres.
Forecast for Thursday, 17 September
Weather: Cloud clearing.
Winds: Variable about 10 knots.
Seas: Below 1 metre.
Swell: Southwesterly 1.5 to 2.5 metres.
Forecast for Friday, 18 September
Weather: Partly cloudy.
Winds: North to northwesterly 10 to 15 knots shifting southwesterly 15 to 20 knots during the day.
Seas: Below 1 metre, increasing to 1 to 1.5 metres during the morning.
Swell: Southwesterly 1.5 to 2.5 metres.

Forecast for Tuesday, 15 September
Weather: Sunny.
Winds: Southerly 15 to 20 knots.
Seas: 1 to 1.5 metres.
Swell: Southwesterly 2 to 3 metres.
Forecast for Wednesday, 16 September
Weather: Sunny.
Winds: South to southeasterly 10 to 15 knots, reaching up to 20 knots offshore north of Geraldton early in the morning. Winds tending east to southeasterly in the early morning then turning south to southwesterly below 10 knots during the morning.
Seas: 1 to 1.5 metres, decreasing below 1 metre during the morning.
Swell: Southwesterly 2 to 3 metres.
Forecast for Thursday, 17 September
Weather: Partly cloudy.
Winds: Variable about 10 knots becoming northwesterly 10 to 15 knots in the early afternoon.
Seas: Below 1 metre.
Swell: Southwesterly 1.5 to 2 metres.
Forecast for Friday, 18 September
Weather: Cloudy. 70% chance of showers. The chance of a thunderstorm in the afternoon.
Winds: North to northwesterly 15 to 20 knots turning westerly during the morning.
Seas: Around 1 metre, increasing to 1 to 1.5 metres during the morning.
Swell: Southwesterly 1.5 to 2.5 metres, tending westerly 2 to 2.5 metres during the afternoon or evening.

Forecast for Tuesday, 15 September
Weather: Sunny.
Winds: Southerly 15 to 20 knots turning southeasterly in the evening.
Seas: Around 1 metre, increasing to 1 to 1.5 metres offshore during the afternoon.
Swell: Southwesterly 2.5 to 3 metres.
Forecast for Wednesday, 16 September
Weather: Sunny morning. The chance of a thunderstorm inshore in the afternoon and early evening.
Winds: Easterly 10 to 15 knots turning south to southeasterly below 10 knots in the middle of the day.
Seas: 1 to 1.5 metres, decreasing below 1 metre during the morning.
Swell: Southwesterly 2 to 3 metres, decreasing to 2 metres by early evening.
Forecast for Thursday, 17 September
Weather: Partly cloudy.
Winds: Variable about 10 knots becoming northwesterly 10 to 15 knots in the morning.
Seas: Below 1 metre.
Swell: Southwesterly 1.5 to 2 metres.
Forecast for Friday, 18 September
Weather: Cloudy. 90% chance of showers. The chance of a thunderstorm.
Winds: North to northwesterly 15 to 20 knots turning westerly 20 to 30 knots during the morning.
Seas: Around 1 metre, increasing to 1.5 to 2 metres during the morning.
Swell: Southwesterly 1.5 to 2 metres, tending westerly 2 to 2.5 metres during the morning.

Forecast for Tuesday, 15 September
Weather: Sunny.
Winds: East to southeasterly 10 to 15 knots, reaching up to 25 knots offshore east of Cape Leeuwin during the afternoon and evening.
Seas: Below 1 metre, increasing to 1 to 2 metres east of Cape Leeuwin.
Swell: Southwesterly 3 metres. East to southeasterly around 1 metre offshore.
Forecast for Wednesday, 16 September
Weather: Sunny morning. The chance of a thunderstorm inshore in the afternoon and early evening.
Winds: East to northeasterly 10 to 15 knots, reaching up to 20 knots offshore east of Cape Leeuwin during the morning. Winds becoming variable about 10 knots in the middle of the day then becoming northeast to southeasterly 10 to 15 knots in the late evening.
Seas: 1 to 2 metres, decreasing below 1 metre around midday.
Swell: Southwesterly 2 to 3 metres. East to southeasterly below 1 metre inshore, increasing to 1 to 1.5 metres offshore.
Forecast for Thursday, 17 September
Weather: Partly cloudy.
Winds: North to northeasterly 10 to 15 knots turning northwesterly 15 to 20 knots early in the morning.
Seas: Around 1 metre.
Swell: Southwesterly 1.5 to 2 metres. East to southeasterly below 1 metre inshore, increasing to around 1 metre offshore.
Forecast for Friday, 18 September
Weather: Cloudy. 90% chance of showers. The chance of a thunderstorm in the afternoon.
Winds: North to northwesterly 15 to 20 knots tending west to northwesterly 20 to 25 knots during the day.
Seas: 1 to 1.5 metres, increasing to 1.5 to 2.5 metres during the morning.
Swell: Southwesterly 1.5 to 2.5 metres.

Forecast for Tuesday, 15 September
Weather: Mostly sunny.
Winds: Southerly 15 to 20 knots, reaching up to 25 knots offshore north of Coral Bay in the evening.
Seas: Around 1 metre, increasing to 1 to 1.5 metres during the afternoon.
Swell: Southwesterly 2 to 2.5 metres.
Forecast for Wednesday, 16 September
Weather: Sunny.
Winds: Southerly 15 to 20 knots.
Seas: 1 to 1.5 metres, decreasing to 1 metre during the morning.
Swell: Southwesterly 2 to 2.5 metres.
Forecast for Thursday, 17 September
Weather: Mostly sunny.
Winds: Southerly 10 to 15 knots.
Seas: Around 1 metre.
Swell: Southwesterly 1.5 to 2 metres.
Forecast for Friday, 18 September
Weather: Mostly sunny.
Winds: South to southwesterly about 10 knots increasing to 15 to 20 knots during the day.
Seas: Below 1 metre, increasing to 1 to 1.5 metres during the afternoon or evening.
Swell: Southwesterly 1.5 to 2.5 metres.

Forecast for Tuesday, 15 September
Weather: Sunny.
Winds: Variable about 10 knots.
Seas: Below 1 metre.
Swell: Westerly below 1 metre.
Forecast for Wednesday, 16 September
Weather: Mostly sunny.
Winds: Variable about 10 knots becoming southeast to southwesterly 10 to 15 knots in the early morning then becoming variable about 10 knots in the morning.
Seas: Below 1 metre.
Swell: Westerly below 1 metre.
Forecast for Thursday, 17 September
Weather: Sunny.
Winds: Southeast to southwesterly 10 to 15 knots tending northeast to southeasterly in the morning then tending northwest to northeasterly in the early afternoon.
Seas: Below 1 metre.
Swell: Westerly below 1 metre.
Forecast for Friday, 18 September
Weather: Mostly sunny.
Winds: Variable about 10 knots becoming east to northeasterly 10 to 15 knots during the day then becoming variable about 10 knots during the afternoon.
Seas: Below 1 metre.
Swell: Westerly below 1 metre.

Forecast for Tuesday, 15 September
Weather: Sunny.
Winds: Southerly 15 to 20 knots turning east to southeasterly in the evening.
Seas: Around 1 metre, increasing to 1 to 1.5 metres during the afternoon.
Swell: Southwesterly 2.5 to 3 metres.
Forecast for Wednesday, 16 September
Weather: Sunny.
Winds: Easterly 10 to 15 knots turning south to southeasterly below 10 knots in the middle of the day then becoming east to southeasterly in the late evening.
Seas: Around 1 metre, decreasing below 0.5 metres during the afternoon.
Swell: Southwesterly 2 to 3 metres, decreasing to 2 metres by early evening.
Forecast for Thursday, 17 September
Weather: Partly cloudy.
Winds: Northeasterly 10 to 15 knots turning northwesterly during the morning.
Seas: Around 1 metre.
Swell: Southwesterly 1.5 to 2 metres.
Forecast for Friday, 18 September
Weather: Cloudy. 95% chance of showers. The chance of a thunderstorm.
Winds: North to northwesterly 15 to 20 knots tending west to northwesterly 20 to 30 knots during the day.
Seas: 1 to 1.5 metres, increasing to 1.5 to 2 metres during the morning.
Swell: Southwesterly 2 metres, tending westerly 2 to 2.5 metres during the morning.

Forecast for Tuesday, 15 September
Weather: Sunny.
Winds: West to southwesterly 10 to 15 knots, reaching up to 20 knots west of Port Hedland during the afternoon and evening.
Seas: Around 1 metre, increasing to 1 to 1.5 metres west of Port Hedland during the afternoon.
Swell: Westerly below 1 metre.
Forecast for Wednesday, 16 September
Weather: Partly cloudy.
Winds: Southeast to southwesterly 15 to 20 knots tending northeast to southeasterly in the morning then becoming variable about 10 knots in the late evening.
Seas: 1 to 1.5 metres, decreasing below 1 metre during the afternoon.
Swell: Westerly below 1 metre.
Forecast for Thursday, 17 September
Weather: Mostly sunny.
Winds: Variable about 10 knots becoming northeast to southeasterly 15 to 20 knots in the morning then tending northwest to northeasterly 10 to 15 knots in the evening.
Seas: Around 1 metre.
Swell: Westerly below 1 metre.
Forecast for Friday, 18 September
Weather: Cloud clearing.
Winds: Southeast to southwesterly 10 to 15 knots tending northwest to northeasterly during the morning then tending west to northwesterly during the evening.
Seas: Below 1 metre.
Swell: Westerly below 1 metre.

Forecast for Tuesday, 15 September
Weather: Sunny.
Winds: Southwesterly 15 to 20 knots.
Seas: 1 to 1.5 metres.
Swell: West to southwesterly around 1 metre inshore, increasing to 1.5 to 2 metres about offshore western waters.
Forecast for Wednesday, 16 September
Weather: Mostly sunny.
Winds: Southerly 10 to 15 knots, reaching up to 20 knots offshore early in the morning. Winds tending southwesterly in the middle of the day.
Seas: 1 to 1.5 metres, decreasing below 1 metre during the morning.
Swell: West to southwesterly around 1 metre inshore, increasing to 1.5 to 2 metres about offshore western waters.
Forecast for Thursday, 17 September
Weather: Sunny.
Winds: Southeast to southwesterly 10 to 15 knots becoming variable about 10 knots in the middle of the day.
Seas: Below 1 metre.
Swell: West to southwesterly around 1 metre inshore, increasing to 1 to 2 metres about offshore western waters.
Forecast for Friday, 18 September
Weather: Mostly sunny.
Winds: Variable below 10 knots becoming north to northwesterly 10 to 15 knots during the day then turning west to southwesterly during the afternoon.
Seas: Below 1 metre, increasing to around 1 metre west of Barrow Island.
Swell: West to southwesterly below 1 metre inshore, increasing to 1 to 1.5 metres offshore.

Forecast for Tuesday, 15 September
Weather: Sunny.
Winds: Variable about 10 knots becoming northwesterly 10 to 15 knots in the early afternoon then becoming variable about 10 knots in the evening.
Seas: Below 1 metre.
Swell: Westerly below 1 metre.
Forecast for Wednesday, 16 September
Weather: Partly cloudy.
Winds: Northwest to northeasterly 10 to 15 knots tending northwest to southwesterly in the early afternoon then becoming variable about 10 knots in the evening.
Seas: Below 1 metre.
Swell: Westerly below 1 metre.
Forecast for Thursday, 17 September
Weather: Mostly sunny.
Winds: Southeast to southwesterly 10 to 15 knots becoming variable about 10 knots in the middle of the day then becoming northwest to southwesterly 10 to 15 knots in the late afternoon.
Seas: Below 1 metre.
Swell: Westerly below 1 metre.
Forecast for Friday, 18 September
Weather: Mostly sunny.
Winds: Variable about 10 knots becoming west to northwesterly 10 to 15 knots during the afternoon then decreasing to about 10 knots during the evening.
Seas: Below 1 metre.
Swell: Westerly below 1 metre.
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