Climate averages 1991–2020
Longueuil weather
in July.
A warm, wet month: the warmest and the 8th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
July is a warm month in Longueuil: daytime highs average 25.7°C and nights cool to about 17.3°C. By daytime temperature it is the warmest month of the year.
Expect about 101 mm of rain on roughly 13 days, which makes July a wet month (the 8th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 15 h 18 min on an average July day.
The nearest other city in this atlas is Mercier–Hochelaga-Maisonneuve (9 km away). In July its highs average 25.7°C, about as warm as Longueuil, with 101 mm of rain.
Among the 86 cities listed in Canada, Longueuil ranks joint 18th of 86 for the warmest July highs and joint 75th of 86 for the driest July (rainfall, lowest first). The mean July high of those 86 cities is 24.4°C; Longueuil is 1.3°C warmer than that mean.
From July to August, average highs fall by 1.1°C to 24.6°C, and monthly rainfall rises from 101 mm to 102 mm.
The annual picture
July 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
Longueuil climate table
| Month | Average highHigh / low | Average low | Precipitation mm/month | Wet days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | -5.3°C-14.2°C | -14.2°C | 74 | 10.5 | 9.19 h |
| February | -3.5°C-12.8°C | -12.8°C | 60 | 9.3 | 10.310 h |
| March | 2.4°C-6.9°C | -6.9°C | 74 | 10.3 | 11.912 h |
| April | 10.7°C0.7°C | 0.7°C | 103 | 11.7 | 13.513 h |
| May | 18.5°C8.3°C | 8.3°C | 100 | 11.9 | 14.915 h |
| June | 23.4°C14.3°C | 14.3°C | 108 | 12.2 | 15.616 h |
| July, selected | 25.7°C17.3°C | 17.3°C | 101 | 12.8 | 15.315 h |
| August | 24.6°C16.5°C | 16.5°C | 102 | 11.6 | 14.114 h |
| September | 20.4°C12.3°C | 12.3°C | 99 | 10.2 | 12.613 h |
| October | 12.9°C5.9°C | 5.9°C | 112 | 11.5 | 11.011 h |
| November | 5.6°C-0.7°C | -0.7°C | 88 | 11.9 | 9.610 h |
| December | -1.3°C-8.5°C | -8.5°C | 85 | 11.7 | 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
July in nearby cities
- Mercier–Hochelaga-Maisonneuve in JulyCanada · 9 kmHigh 25.7°C · Low 17.3°C · 101 mm rain
- Montréal in JulyCanada · 9 kmHigh 24.5°C · Low 16.2°C · 101 mm rain
- Villeray–Saint-Michel–Parc-Extension in JulyCanada · 12 kmHigh 25.5°C · Low 16.8°C · 101 mm rain
- Laval in JulyCanada · 18 kmHigh 25.6°C · Low 17.1°C · 87 mm rain
- Terrebonne in JulyCanada · 25 kmHigh 25.6°C · Low 17.2°C · 95 mm rain
- Repentigny in JulyCanada · 25 kmHigh 25.6°C · Low 17.1°C · 94 mm rain
- Saint-Jean-sur-Richelieu in JulyCanada · 28 kmHigh 25.4°C · Low 17.0°C · 106 mm rain
- Pierrefonds-Roxboro in JulyCanada · 29 kmHigh 25.6°C · Low 17.4°C · 87 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 Longueuil) is explained once on the Longueuil year overview and on the Sources, method and limits page.
Montréal, Villeray–Saint-Michel–Parc-Extension and Mercier–Hochelaga-Maisonneuve lie in the same rainfall cell, so their rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.