Canada
Sarnia sees feels-like daytime highs peak around 30.1°C in July and nighttime lows bottom out near -8.3°C in January. September is the wettest month (~67 mm), while February is the driest (~17 mm). For sunshine, August leads with about 66% clear skies.
Based on mild feels-like temperatures and low rain chances, the most comfortable months are June, September, and August — expect around 16.7–27°C with roughly 33% chance of rain on a given day in June.
| Month | Low / High °C | Rain % | Rainfall | Clear skies | Wind |
|---|---|---|---|---|---|
| January | -8.3° / -3.1° | 8% | 18 mm | 34% | 22.1 kph |
| February | -7.8° / -1.1° | 7% | 17 mm | 37% | 21.3 kph |
| March | -3.4° / 4.4° | 15% | 31 mm | 43% | 20.9 kph |
| April | 3.5° / 12.4° | 26% | 50 mm | 46% | 19.9 kph |
| May | 10° / 20.3° | 31% | 59 mm | 49% | 17.5 kph |
| June☀ | 16.7° / 27° | 33% | 62 mm | 56% | 15.3 kph |
| July | 19.6° / 30.1° | 33% | 61 mm | 64% | 14 kph |
| August☀ | 18.5° / 28.9° | 33% | 64 mm | 66% | 14 kph |
| September☀ | 14.4° / 24.4° | 32% | 67 mm | 63% | 16 kph |
| October | 7.2° / 15.5° | 27% | 57 mm | 56% | 18.8 kph |
| November | 0.6° / 6.9° | 20% | 45 mm | 45% | 20.7 kph |
| December | -5° / 0.1° | 14% | 29 mm | 38% | 21.8 kph |
Feels-like temperatures from long-term historical data; ☀ marks the most comfortable months (mild temperatures, low rain).
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