Weather in Sarnia in August
How warm is it in Sarnia in August?
In August the typical daytime high in Sarnia is 27.2 °C on average, from 28.1 °C at the start to 26.1 °C at the end of the month.
That is 1.3 °C cooler than in July and 3.5 °C warmer than in September.
Click a day for more: afternoon and night, the usual range, records and how fast it is warming.
The average of the weather stations Bowling Green Wwtp (203 km) and Toronto (255 km); nearer ones count more.