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BoM St Johns Marine Weather Forecast

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Forecast for Friday, 4 September
Weather: Partly cloudy.
Winds: Northwesterly 20 to 30 knots.
Seas: 1.5 metres.
Swell: Southwesterly 4 metres.
Forecast for Saturday, 5 September
Weather: Cloudy. 70% chance of showers.
Winds: Westerly 20 to 30 knots, reaching up to 35 knots during the morning. Winds turning southwesterly 15 to 20 knots in the late afternoon.
Seas: 2 to 3 metres, decreasing to 1 to 2 metres by early evening.
Swell: Southwesterly 4 to 5 metres.
Forecast for Sunday, 6 September
Weather: Cloudy.
Winds: Southwesterly 10 to 15 knots turning southerly during the afternoon and evening.
Seas: Around 1 metre.
Swell: Southwesterly 3 to 5 metres, decreasing to 3 metres by early evening.
Forecast for Monday, 7 September
Weather: Partly cloudy.
Winds: South to southeasterly 10 to 15 knots tending east to southeasterly during the day.
Seas: Below 1 metre.
Swell: Southwesterly 2 to 3 metres.

Forecast for Friday, 4 September
Weather: Clear.
Winds: West to southwesterly 20 to 25 knots, reaching up to 30 knots offshore.
Seas: Around 1 metre, increasing to 1.5 to 2 metres offshore.
Swell: Southwesterly 3 metres.
Forecast for Saturday, 5 September
Weather: Cloudy.
Winds: Southwesterly 15 to 25 knots, reaching up to 30 knots early in the morning. Winds becoming variable about 10 knots in the late afternoon.
Seas: 2 to 3 metres, decreasing to 1 to 1.5 metres around midday, then decreasing below 1 metre by early evening.
Swell: Southwesterly 3 metres, increasing to 3 to 4 metres during the morning.
Forecast for Sunday, 6 September
Weather: Mostly sunny.
Winds: East to northeasterly about 10 knots increasing to 15 to 20 knots in the early morning then tending east to southeasterly in the middle of the day.
Seas: Around 1 metre, increasing to 1 to 1.5 metres during the afternoon.
Swell: Southwesterly 3 to 4 metres, decreasing to 2.5 to 3 metres during the morning.
Forecast for Monday, 7 September
Weather: Cloudy. 70% chance of showers.
Winds: Easterly 15 to 25 knots.
Seas: 1.5 to 2 metres.
Swell: Southwesterly 2 to 2.5 metres.

Forecast for Friday, 4 September
Weather: Partly cloudy.
Winds: Northwesterly 10 to 15 knots, reaching up to 20 knots north of Port Vincent to Brighton.
Seas: Around 1 metre.
Swell: South to southwesterly below 1 metre.
Forecast for Saturday, 5 September
Weather: Partly cloudy. 80% chance of showers.
Winds: West to northwesterly 15 to 25 knots, reaching up to 30 knots during the day. Winds tending west to southwesterly 15 to 20 knots during the day.
Seas: 1 to 1.5 metres, increasing to 1.5 to 2.5 metres during the morning.
Swell: South to southwesterly below 1 metre.
Forecast for Sunday, 6 September
Weather: Cloudy.
Winds: South to southwesterly 10 to 15 knots decreasing to about 10 knots in the early morning.
Seas: Around 1 metre, decreasing below 0.5 metres during the morning.
Swell: South to southwesterly around 1 metre.
Forecast for Monday, 7 September
Weather: Partly cloudy.
Winds: Southerly 10 to 15 knots turning southeasterly during the day.
Seas: Below 1 metre.
Swell: South to southwesterly below 1 metre.

Forecast for Friday, 4 September
Weather: Partly cloudy.
Winds: Northwesterly 20 to 30 knots.
Seas: Around 1 metre, increasing to 1 to 1.5 metres through the Backstairs Passage.
Swell: West to southwesterly 1 to 1.5 metres, increasing to 1 to 2 metres inshore.
Forecast for Saturday, 5 September
Weather: Partly cloudy. 80% chance of showers.
Winds: West to northwesterly 20 to 30 knots, reaching up to 35 knots during the morning. Winds tending west to southwesterly 15 to 25 knots during the day.
Seas: 1 to 2 metres, increasing to 2 to 3 metres during the morning, then decreasing below 2 metres later in the evening.
Swell: West to southwesterly 1 to 2 metres, increasing to 2 to 3 metres during the morning.
Forecast for Sunday, 6 September
Weather: Cloudy.
Winds: Southwesterly 10 to 15 knots becoming variable about 10 knots in the morning.
Seas: 1 to 1.5 metres, decreasing below 1 metre during the morning.
Swell: West to southwesterly 2 to 3 metres, decreasing to 1 to 2 metres during the afternoon.
Forecast for Monday, 7 September
Weather: Partly cloudy.
Winds: South to southeasterly 10 to 15 knots tending east to southeasterly below 10 knots during the afternoon.
Seas: Below 1 metre.
Swell: West to southwesterly 1 to 1.5 metres, decreasing to around 1 metre during the morning.

Forecast for Friday, 4 September
Weather: Partly cloudy.
Winds: Northerly 15 to 20 knots.
Seas: Around 1 metre, increasing to 1.5 metres north of Beachport.
Swell: Southwesterly 4 to 5 metres.
Forecast for Saturday, 5 September
Weather: Cloudy. 95% chance of showers. The chance of a thunderstorm in the morning with possible squalls.
Winds: North to northwesterly 20 to 30 knots, reaching up to 35 knots during the morning. Winds turning west to southwesterly during the morning.
Seas: 1.5 to 2 metres, increasing to 2 to 3 metres during the morning.
Swell: Southwesterly 3 to 4 metres, tending westerly 4 metres during the afternoon, then tending west to southwesterly 4 metres by early evening.
Forecast for Sunday, 6 September
Weather: Cloudy. 50% chance of showers.
Winds: West to southwesterly 15 to 20 knots.
Seas: 1 to 2 metres, decreasing to 1 metre during the morning.
Swell: West to southwesterly 3 to 5 metres.
Forecast for Monday, 7 September
Weather: Partly cloudy.
Winds: Southwesterly 15 to 20 knots turning south to southeasterly below 10 knots during the day.
Seas: 1 to 1.5 metres, decreasing to 1 metre during the afternoon.
Swell: Southwesterly 2.5 to 3 metres.

Forecast for Friday, 4 September
Weather: Partly cloudy.
Winds: Westerly 20 to 30 knots.
Seas: 1.5 metres.
Swell: Southwesterly 3 to 4 metres.
Forecast for Saturday, 5 September
Weather: Cloudy. 50% chance of showers.
Winds: Westerly 25 to 30 knots, reaching up to 35 knots offshore early in the morning. Winds turning southwesterly 15 to 25 knots in the late morning then decreasing to 10 to 15 knots in the late afternoon.
Seas: 2 to 3 metres, decreasing to 1 to 1.5 metres by early evening.
Swell: Southwesterly 3 to 5 metres.
Forecast for Sunday, 6 September
Weather: Cloudy.
Winds: West to southwesterly about 10 knots becoming south to southeasterly in the early afternoon then increasing to 10 to 15 knots in the evening.
Seas: Below 1 metre.
Swell: Southwesterly 3 to 5 metres, decreasing to 2.5 to 3 metres during the afternoon.
Forecast for Monday, 7 September
Weather: Cloudy.
Winds: Southeasterly 10 to 15 knots turning easterly 15 to 20 knots during the afternoon.
Seas: Around 1 metre, increasing to 1 to 1.5 metres offshore.
Swell: Southwesterly 2 to 2.5 metres.

Forecast for Friday, 4 September
Weather: Partly cloudy. The chance of a thunderstorm with possible squalls.
Winds: Northwesterly 15 to 25 knots, reaching up to 30 knots west of Kangaroo Island.
Seas: Around 1 metre, increasing to 1.5 metres west of Kangaroo Island.
Swell: Southwesterly 4 metres.
Forecast for Saturday, 5 September
Weather: Cloudy. 95% chance of showers. The chance of a thunderstorm in the early morning.
Winds: West to northwesterly 20 to 30 knots, reaching up to 35 knots during the morning and early afternoon. Winds tending west to southwesterly during the morning and early afternoon.
Seas: 2 to 3 metres.
Swell: Southwesterly 4 metres, tending westerly 4 to 5 metres during the morning.
Forecast for Sunday, 6 September
Weather: Cloudy.
Winds: Southwesterly 15 to 20 knots.
Seas: 1 to 1.5 metres, decreasing below 1 metre during the morning.
Swell: Southwesterly 3 to 5 metres, decreasing to 3 metres by early evening.
Forecast for Monday, 7 September
Weather: Partly cloudy.
Winds: South to southwesterly 10 to 15 knots turning southeasterly during the morning.
Seas: Below 1 metre.
Swell: Southwesterly 2.5 to 3 metres.

Forecast for Friday, 4 September
Weather: Partly cloudy. The chance of a thunderstorm north of Cowell to Wallaroo.
Winds: West to northwesterly 10 to 15 knots, reaching up to 25 knots south of Cowell to Wallaroo.
Seas: Around 1 metre.
Swell: South to southwesterly 1 to 1.5 metres, increasing to 1.5 to 2.5 metres south of Cowell to Wallaroo.
Forecast for Saturday, 5 September
Weather: Cloudy. The chance of a thunderstorm north of Cowell to Wallaroo in the early morning.
Winds: West to northwesterly 20 to 25 knots, reaching up to 30 knots south of Cowell to Wallaroo during the morning and early afternoon. Winds tending west to southwesterly 15 to 25 knots during the morning and early afternoon.
Seas: 1 to 2 metres, increasing to 2 to 3 metres during the morning.
Swell: South to southwesterly 1.5 to 2.5 metres, decreasing to 1 to 1.5 metres around midday, then increasing to 1 to 2 metres by early evening.
Forecast for Sunday, 6 September
Weather: Partly cloudy.
Winds: West to southwesterly 10 to 15 knots decreasing to about 10 knots in the morning then tending southerly 10 to 15 knots in the early afternoon.
Seas: Around 1 metre.
Swell: South to southwesterly around 1 metre, increasing to 1.5 to 2.5 metres south of Cowell to Wallaroo.
Forecast for Monday, 7 September
Weather: Partly cloudy.
Winds: Southerly 10 to 15 knots turning southeasterly during the morning.
Seas: Below 1 metre.
Swell: South to southwesterly below 1 metre, increasing to 1 to 1.5 metres south of Cowell to Wallaroo.

Forecast for Friday, 4 September
Weather: Partly cloudy.
Winds: North to northwesterly 15 to 20 knots.
Seas: 1 to 1.5 metres.
Swell: Southwesterly 4 metres.
Forecast for Saturday, 5 September
Weather: Cloudy. 95% chance of showers. The chance of a thunderstorm south of Salt Creek in the morning.
Winds: Northwesterly 20 to 30 knots, reaching up to 35 knots offshore during the morning and early afternoon. Winds turning west to southwesterly during the morning.
Seas: 1.5 to 2 metres, increasing to 2 to 3 metres during the morning.
Swell: Southwesterly 3 to 4 metres, tending westerly 4 metres during the afternoon.
Forecast for Sunday, 6 September
Weather: Cloudy.
Winds: Southwesterly 15 to 20 knots.
Seas: 1 to 1.5 metres, decreasing below 1 metre during the morning.
Swell: Southwesterly 3 to 4 metres, decreasing to 3 metres later in the evening.
Forecast for Monday, 7 September
Weather: Partly cloudy.
Winds: South to southwesterly 10 to 15 knots turning southeasterly below 10 knots during the afternoon.
Seas: Below 1 metre.
Swell: Southwesterly 2 to 3 metres.

Forecast for Friday, 4 September
Weather: Clear.
Winds: Westerly 15 to 25 knots, reaching up to 30 knots south of Streaky Bay.
Seas: Around 1 metre, increasing to 1 to 1.5 metres south of Streaky Bay.
Swell: Southwesterly 3 metres.
Forecast for Saturday, 5 September
Weather: Cloudy.
Winds: West to southwesterly 20 to 25 knots, reaching up to 30 knots during the morning. Winds tending south to southwesterly below 10 knots during the afternoon and evening.
Seas: 2 to 3 metres, decreasing to 1 to 2 metres around midday, then decreasing to 1 metre by early evening.
Swell: Southwesterly 3 metres, increasing to 3 to 5 metres during the morning.
Forecast for Sunday, 6 September
Weather: Partly cloudy.
Winds: Variable about 10 knots becoming southeasterly 15 to 20 knots in the early afternoon.
Seas: Around 1 metre.
Swell: Southwesterly 3 to 5 metres, decreasing to 2.5 to 3 metres during the afternoon.
Forecast for Monday, 7 September
Weather: Partly cloudy.
Winds: East to southeasterly 15 to 20 knots.
Seas: 1 to 1.5 metres.
Swell: Southwesterly 2 to 2.5 metres.
Nuriootpa
▲ N
2 kn ENE
· 12 °C
Warnings
Within 100 km of St Johns SA
Severe
State Wide
Marine Severe
View all SA warnings
Temperature
St Johns
12 °C 19 °C 4pm 8 °C 3am
↓ Cooling
Now: 12 °C
Weather Now for St Johns
Shower or two.
12 °C
Feels like 12 °C
Wind
2 kn ENE
Humidity
89%
Pressure
1010 hPa
At Nuriootpa
Nearby Wind
50 km radius
N S W E 7 kn Roseworthy Eudunda 13 kn Mount Crawford 7 kn Edinburgh Airport
St Johns
2 kn ENE
Recent Locations
St Johns
2 kn ENE
 12°
Orchid Valley -
Sun
6:29am rise 5:58pm set
11 h 28 m of daylight
Now: 10:58pm
123 seconds more than yesterday
Moon
12:35amrise 10:25amset
47% illuminated
Last Quarter
Live Weather
Nearby
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2 kn ENE
 12°
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 13°
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7 kn NNE
 15°
Windiest in Australia
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29 kn NW
 10°
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Calm
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Hottest in Australia
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11 kn WNW
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25 kn WNW
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Wettest in Australia
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 14.8 mm
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