August is the hottest month in Semiahmoo with an average temperature of 20°C (67°F) and the coldest is January at 4°C (39°F) with the most daily sunshine hours at 13 in July. The wettest month is October with an average of 82.5mm of rain. The best month to swim in the sea is in August when the average sea temperature is 14°C (57°F).
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Sunrise 07:31
Sunset 16:23
Sunrise 07:31
Sunset 16:23