Typical Weather

Sarnia · Canada

Weather in Sarnia in May

In May the typical daytime high in Sarnia is 20.6 °C on average, from 17.2 °C at the start to 23.9 °C at the end of the month.

The last 10 years were 0.6 °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.