Hoser
My best advice would be to bring a 12.5m for the lighter days and a 10.0m for the windier stuff

Just joshin, where will you be sailing, as north is stronger than south, rivers and esturies less windy than the ocean

How much do you weigh, what boards, what type of sailing

Seabreezes here form around high pressure systems, so as the high pressure system nears the coast, you get strong seabreezes, 20 -30 knots, sometimes up to 35 kts, sometimes for days on end, then the breezes get lighter 18 to 25 kts for a day or two, then 15 - 20 kts, then 12 to 18 kts then just very light 8-15kts.
You can sail easterlies in the morning and seabreezes in the pm.
Be more specific and others may be able to help you more

Hardina (Exchange Student staying at Hardie's place)