Climate averages 1991–2020
Saint-Jean-sur-Richelieu weather
in October.
A cool, wet month: the 6th warmest and the 11th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
October is a cool month in Saint-Jean-sur-Richelieu: daytime highs average 12.9°C and nights cool to about 5.8°C. By daytime temperature it is the 6th warmest of the 12 months.
Expect about 113 mm of rain on roughly 12 days, which makes October a wet month (the 11th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 11 h 00 min on an average October day.
The nearest other city in this atlas is Longueuil (28 km away). In October its highs average 12.9°C, about as warm as Saint-Jean-sur-Richelieu, with 112 mm of rain.
Among the 86 cities listed in Canada, Saint-Jean-sur-Richelieu ranks joint 44th of 86 for the warmest October highs and 67th of 86 for the driest October (rainfall, lowest first). The mean October high of those 86 cities is 12.7°C; Saint-Jean-sur-Richelieu is 0.3°C warmer than that mean.
From October to November, average highs fall by 7.1°C to 5.8°C, and monthly rainfall falls from 113 mm to 86 mm.
The annual picture
October 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 | 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, selected | 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
October in nearby cities
- Longueuil in OctoberCanada · 28 kmHigh 12.9°C · Low 5.9°C · 112 mm rain
- Montréal in OctoberCanada · 34 kmHigh 11.8°C · Low 4.9°C · 112 mm rain
- Mercier–Hochelaga-Maisonneuve in OctoberCanada · 37 kmHigh 12.9°C · Low 5.8°C · 112 mm rain
- Villeray–Saint-Michel–Parc-Extension in OctoberCanada · 39 kmHigh 12.7°C · Low 5.4°C · 112 mm rain
- Laval in OctoberCanada · 44 kmHigh 12.8°C · Low 5.7°C · 107 mm rain
- Pierrefonds-Roxboro in OctoberCanada · 50 kmHigh 12.9°C · Low 6.1°C · 107 mm rain
- Repentigny in OctoberCanada · 51 kmHigh 12.8°C · Low 5.7°C · 106 mm rain
- Terrebonne in OctoberCanada · 53 kmHigh 12.7°C · Low 5.8°C · 107 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.