Climate averages 1991–2020
Sarnia weather
in June.
A warm, moderately wet month: the 3rd warmest and the wettest of the year.
Long-term climate patterns, not a forecast for a particular trip.
June is a warm month in Sarnia: daytime highs average 23.7°C and nights cool to about 15.9°C. By daytime temperature it is the 3rd warmest of the 12 months.
Expect about 87 mm of rain on roughly 11 days, which makes June a moderately wet month (the wettest month of the year). Daylight, from sunrise to sunset, lasts about 15 h 18 min on an average June day.
The nearest other city in this atlas is Clinton Township (61 km away). In June its highs average 24.7°C, 1.0°C warmer than Sarnia, with 87 mm of rain.
Among the 86 cities listed in Canada, Sarnia ranks 5th of 86 for the warmest June highs and joint 28th of 86 for the driest June (rainfall, lowest first). The mean June high of those 86 cities is 21.4°C; Sarnia is 2.3°C warmer than that mean.
From June to July, average highs rise by 2.4°C to 26.1°C, and monthly rainfall falls from 87 mm to 71 mm.
The annual picture
June in context
Monthly precipitation
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Sarnia climate table
| Month | Average highHigh / low | Average low | Precipitation mm/month | Wet days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | -1.2°C-7.8°C | -7.8°C | 57 | 9.6 | 9.49 h |
| February | -0.3°C-8.0°C | -8.0°C | 52 | 8.4 | 10.510 h |
| March | 4.6°C-3.7°C | -3.7°C | 57 | 9.6 | 11.912 h |
| April | 11.4°C2.8°C | 2.8°C | 85 | 11.4 | 13.413 h |
| May | 18.3°C9.7°C | 9.7°C | 85 | 12.0 | 14.615 h |
| June, selected | 23.7°C15.9°C | 15.9°C | 87 | 10.7 | 15.315 h |
| July | 26.1°C18.8°C | 18.8°C | 71 | 11.0 | 15.015 h |
| August | 25.2°C18.3°C | 18.3°C | 70 | 10.4 | 13.914 h |
| September | 21.7°C14.7°C | 14.7°C | 73 | 9.1 | 12.513 h |
| October | 14.7°C8.5°C | 8.5°C | 76 | 10.8 | 11.111 h |
| November | 7.7°C2.2°C | 2.2°C | 66 | 9.7 | 9.810 h |
| December | 1.8°C-3.3°C | -3.3°C | 56 | 9.4 | 9.19 h |
Precipitation (rain or snow, as water) is the average of the 30 separate monthly totals. A wet day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
June in nearby cities
- Clinton Township in JuneUnited States · 61 kmHigh 24.7°C · Low 16.5°C · 87 mm rain
- Shelby in JuneUnited States · 62 kmHigh 24.8°C · Low 15.9°C · 94 mm rain
- Sterling Heights in JuneUnited States · 68 kmHigh 24.9°C · Low 16.3°C · 87 mm rain
- Rochester Hills in JuneUnited States · 70 kmHigh 24.7°C · Low 15.6°C · 100 mm rain
- Warren in JuneUnited States · 74 kmHigh 25.0°C · Low 16.0°C · 87 mm rain
- Troy in JuneUnited States · 74 kmHigh 24.8°C · Low 15.9°C · 94 mm rain
- Southfield in JuneUnited States · 87 kmHigh 25.1°C · Low 15.9°C · 94 mm rain
- Waterford in JuneUnited States · 88 kmHigh 24.7°C · Low 15.3°C · 95 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Sarnia) is explained once on the Sarnia year overview and on the Sources, method and limits page.