Climate in Sarnia: average temperature by month
In Sarnia the warmest month is July, with 28.4 °C on average in the afternoon; the coolest is January, with 0.5 °C.
The average of the weather stations Bowling Green Wwtp (203 km) and Toronto (255 km); nearer ones count more.
| Month | Average high | Coolest to warmest day |
|---|---|---|
| January | 0.5 °C | -0.2 °C – 1.4 °C |
| February | 1.9 °C | 0.2 °C – 4.2 °C |
| March | 7.6 °C | 4.5 °C – 10.9 °C |
| April | 14.3 °C | 11.1 °C – 17.1 °C |
| May | 20.6 °C | 17.2 °C – 23.9 °C |
| June | 26.3 °C | 24.1 °C – 28.2 °C |
| July | 28.4 °C | 28.1 °C – 28.7 °C |
| August | 27.2 °C | 26.1 °C – 28.1 °C |
| September | 23.7 °C | 20.8 °C – 25.9 °C |
| October | 16.7 °C | 12.8 °C – 20.6 °C |
| November | 8.8 °C | 5.5 °C – 12.6 °C |
| December | 2.9 °C | 1.6 °C – 5.2 °C |