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Longueuil Weather by Month
Average temperatures, rainfall and humidity for Longueuil, Canada, month by month, built from OpenWeather’s historical records. Use it to see what a typical Longueuil month looks like before you travel — then check the live Longueuil forecast for the days ahead.
Warmest month
July
27°C average high
Coolest month
January
-12°C average low
Wettest month
June
64 mm of rain
Driest month
February
15 mm of rain
Average temperature and rainfall in Longueuil by month
Averages of the daily highs and lows recorded in each month, with total rainfall, mean humidity and mean wind speed.
| Month | Avg high | Avg low | Record low / high | Rainfall | Humidity | Wind |
|---|---|---|---|---|---|---|
| January | -4°C | -12°C | -29°C / 9°C | 17 mm | 78% | 14 km/h |
| February | -3°C | -12°C | -30°C / 14°C | 15 mm | 75% | 14 km/h |
| March | 3°C | -5°C | -28°C / 21°C | 35 mm | 71% | 14 km/h |
| April | 12°C | 2°C | -11°C / 27°C | 60 mm | 65% | 14 km/h |
| May | 20°C | 10°C | 0°C / 35°C | 53 mm | 64% | 13 km/h |
| June | 24°C | 15°C | 4°C / 36°C | 64 mm | 69% | 11 km/h |
| July | 27°C | 18°C | 8°C / 35°C | 52 mm | 71% | 11 km/h |
| August | 26°C | 16°C | 9°C / 35°C | 59 mm | 74% | 10 km/h |
| September | 22°C | 13°C | 1°C / 33°C | 46 mm | 75% | 10 km/h |
| October | 15°C | 7°C | -7°C / 30°C | 57 mm | 76% | 12 km/h |
| November | 6°C | -1°C | -18°C / 23°C | 40 mm | 76% | 13 km/h |
| December | 0°C | -7°C | -27°C / 17°C | 34 mm | 79% | 13 km/h |
Best time to visit Longueuil
The most comfortable time to visit Longueuil is generally June and August to September, balancing mild daytime temperatures against the driest stretch of the year. The city has strongly marked seasons and rain concentrates around June, totalling about 530 mm a year.
Travellers who prefer heat should aim for July, when highs average 27°C. June is the month to avoid if rain would spoil your plans — it averages 64 mm, roughly 4× the rainfall of the driest month (February).
Source: OpenWeather historical and statistical weather data. Values are long-term averages, not a forecast — see the Longueuil forecast for what is happening now.