Climate averages 1991–2020
Saint-Jean-sur-Richelieu weather
in August.
A warm, wet month: the 2nd warmest and the 10th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
August is a warm month in Saint-Jean-sur-Richelieu: daytime highs average 24.4°C and nights cool to about 16.3°C. By daytime temperature it is the 2nd warmest of the 12 months.
Expect about 108 mm of rain on roughly 12 days, which makes August a wet month (the 10th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 14 h 06 min on an average August day.
The nearest other city in this atlas is Longueuil (28 km away). In August its highs average 24.6°C, about as warm as Saint-Jean-sur-Richelieu, with 102 mm of rain.
Among the 86 cities listed in Canada, Saint-Jean-sur-Richelieu ranks joint 40th of 86 for the warmest August highs and 82nd of 86 for the driest August (rainfall, lowest first). The mean August high of those 86 cities is 23.8°C; Saint-Jean-sur-Richelieu is 0.6°C warmer than that mean.
From August to September, average highs fall by 4.1°C to 20.3°C, and monthly rainfall falls from 108 mm to 98 mm.
The annual picture
August 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
Saint-Jean-sur-Richelieu climate table
| Month | Average highHigh / low | Average low | Precipitation mm/month | Wet days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | -4.8°C-13.7°C | -13.7°C | 71 | 11.2 | 9.29 h |
| February | -3.2°C-12.7°C | -12.7°C | 60 | 9.3 | 10.410 h |
| March | 2.6°C-6.8°C | -6.8°C | 75 | 11.4 | 11.912 h |
| April | 10.7°C0.7°C | 0.7°C | 99 | 11.7 | 13.513 h |
| May | 18.4°C8.1°C | 8.1°C | 104 | 12.0 | 14.915 h |
| June | 23.1°C14.0°C | 14.0°C | 117 | 12.7 | 15.616 h |
| July | 25.4°C17.0°C | 17.0°C | 106 | 13.3 | 15.315 h |
| August, selected | 24.4°C16.3°C | 16.3°C | 108 | 12.3 | 14.114 h |
| September | 20.3°C12.1°C | 12.1°C | 98 | 10.7 | 12.613 h |
| October | 12.9°C5.8°C | 5.8°C | 113 | 12.0 | 11.011 h |
| November | 5.8°C-0.7°C | -0.7°C | 86 | 12.1 | 9.610 h |
| December | -0.9°C-8.1°C | -8.1°C | 83 | 12.5 | 8.89 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
August in nearby cities
- Longueuil in AugustCanada · 28 kmHigh 24.6°C · Low 16.5°C · 102 mm rain
- Montréal in AugustCanada · 34 kmHigh 23.5°C · Low 15.4°C · 102 mm rain
- Mercier–Hochelaga-Maisonneuve in AugustCanada · 37 kmHigh 24.6°C · Low 16.5°C · 102 mm rain
- Villeray–Saint-Michel–Parc-Extension in AugustCanada · 39 kmHigh 24.5°C · Low 16.0°C · 102 mm rain
- Laval in AugustCanada · 44 kmHigh 24.6°C · Low 16.3°C · 91 mm rain
- Pierrefonds-Roxboro in AugustCanada · 50 kmHigh 24.5°C · Low 16.7°C · 91 mm rain
- Repentigny in AugustCanada · 51 kmHigh 24.5°C · Low 16.3°C · 95 mm rain
- Terrebonne in AugustCanada · 53 kmHigh 24.5°C · Low 16.4°C · 96 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 Saint-Jean-sur-Richelieu) is explained once on the Saint-Jean-sur-Richelieu year overview and on the Sources, method and limits page.