Weather in Sarnia in July
How warm is it in Sarnia in July?
In July the typical daytime high in Sarnia is 28.4 °C on average, from 28.2 °C at the start to 28.1 °C at the end of the month.
That is 2.2 °C warmer than in June and 1.3 °C warmer than in August.
The last 10 years were 0.4 °C warmer than more than 40 years ago.
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.