July is one of the warmer months of the year in Longueuil, with average highs near 26.1°C and lows around 16.3°C (mean 21.2°C). It is about average for rainfall, averaging 93 mm of rainfall and 75% relative humidity across the period.
July is one of the warmer months of the year in Longueuil. Across 45 years of records, the warmest July in Longueuil was 2020 — when the month averaged 24.8°C — while the coldest was 1992 at 18°C. Typical July days reach 26.1°C with nights near 16.3°C. The long-term trend is warming, about 0.5°C per decade.
July is about average for rainfall in Longueuil, averaging 93 mm of rainfall. The wettest July on record was 2023 with 165 mm, while the driest was 1989 at 48 mm.
Relative humidity in Longueuil during July averages 75%. The most humid July was 2009 at 83%, and the least humid was 2025 at 66%.
July receives about 5.7 kWh/m²/day of solar energy in Longueuil. The sunniest July was 2018 at 6.5 kWh/m²/day, and the cloudiest was 2009 at 4.9.
Average wind speed in Longueuil during July is 2.6 m/s. The windiest Julys were 1984, 1996 and 1997 at 3.1 m/s, while the calmest was 2023 at 2.1 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 20.7°C | 20.9°C | 20.4°C | 21.8°C | 22.9°C | +2.2°C |
| Avg High | 25.9°C | 25.9°C | 24.9°C | 26.7°C | 28.0°C | +2.1°C |
| Avg Low | 15.6°C | 16.0°C | 15.9°C | 16.8°C | 17.7°C | +2.1°C |
| Avg Rain | 86 mm | 95 mm | 107 mm | 85 mm | 93 mm | +7 mm |
July temperatures in Longueuil have risen by about 1.9°C between 1981–1985 and 2021–2025.
July has ranged from a record low of 7.2°C (1982) to a record high of 36.6°C (2020).
Rainfall in July is about average for rainfall, averaging 93 mm, with a wettest year of 165 mm.
One of the best times to visit Longueuil
July is one of the best times to visit Longueuil. Expect days averaging 26.1°C and nights around 16.3°C (mean 21.2°C) — warmer than Longueuil's yearly average — with higher rainfall (93 mm), so conditions are generally comfortable for sightseeing and outdoor plans.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 29.4°C | 23.8°C | 18.1°C | 34.6°C | 11.3°C | 63 mm | 66% | 2.5 m/s | 5.8 |
| 2024 | 28.3°C | 23.2°C | 18.1°C | 33.0°C | 13.4°C | 101 mm | 73% | 2.5 m/s | 5.9 |
| 2023 🌧️ | 26.7°C | 22.4°C | 18.0°C | 33.0°C | 11.0°C | 165 mm | 80% | 2.1 m/s | 5.1 |
| 2022 | 27.0°C | 21.7°C | 16.5°C | 31.3°C | 9.7°C | 69 mm | 71% | 2.8 m/s | 6.2 |
| 2021 | 26.1°C | 21.3°C | 16.4°C | 31.3°C | 11.8°C | 82 mm | 69% | 2.5 m/s | 5 |
| 2020 🔥 | 30.3°C | 24.8°C | 19.3°C | 36.6°C | 15.5°C | 79 mm | 68% | 2.8 m/s | 5.9 |
| 2019 | 27.9°C | 22.8°C | 17.7°C | 32.3°C | 12.9°C | 63 mm | 75% | 2.5 m/s | 6.2 |
| 2018 | 28.8°C | 23.4°C | 18.0°C | 33.5°C | 11.7°C | 85 mm | 71% | 2.6 m/s | 6.5 |
| 2017 | 24.3°C | 20.1°C | 15.9°C | 27.6°C | 10.2°C | 112 mm | 82% | 2.6 m/s | 5.5 |
| 2016 | 27.1°C | 21.8°C | 16.5°C | 32.1°C | 12.1°C | 91 mm | 73% | 2.7 m/s | 5.8 |
| 2015 | 26.2°C | 21.1°C | 16.0°C | 32.7°C | 10.0°C | 107 mm | 76% | 2.5 m/s | 5.7 |
| 2014 | 24.3°C | 20.0°C | 15.7°C | 30.6°C | 12.2°C | 104 mm | 80% | 2.8 m/s | 5.5 |
| 2013 | 26.1°C | 21.5°C | 16.9°C | 30.8°C | 10.9°C | 68 mm | 77% | 2.5 m/s | 6 |
| 2012 | 28.3°C | 22.5°C | 16.7°C | 34.1°C | 11.7°C | 65 mm | 66% | 2.4 m/s | 6.4 |
| 2011 | 26.9°C | 22.1°C | 17.3°C | 31.6°C | 13.9°C | 66 mm | 77% | 2.3 m/s | 6.2 |
| 2010 | 27.4°C | 22.5°C | 17.7°C | 33.3°C | 11.1°C | 85 mm | 74% | 2.6 m/s | 5.9 |
| 2009 | 23.2°C | 19.2°C | 15.3°C | 27.9°C | 9.3°C | 142 mm | 83% | 2.5 m/s | 4.9 |
| 2008 | 24.9°C | 20.6°C | 16.2°C | 29.8°C | 11.1°C | 122 mm | 81% | 2.5 m/s | 5.4 |
| 2007 | 24.3°C | 19.8°C | 15.3°C | 29.7°C | 8.8°C | 127 mm | 79% | 2.3 m/s | 5.5 |
| 2006 | 26.1°C | 21.7°C | 17.3°C | 29.6°C | 12.2°C | 112 mm | 83% | 2.7 m/s | 5.7 |
| 2005 | 26.2°C | 21.4°C | 16.5°C | 30.0°C | 11.2°C | 98 mm | 78% | 2.4 m/s | 6.1 |
| 2004 | 25.2°C | 20.8°C | 16.4°C | 30.3°C | 10.8°C | 145 mm | 79% | 2.3 m/s | 5.3 |
| 2003 | 25.7°C | 21.1°C | 16.5°C | 29.1°C | 12.8°C | 101 mm | 78% | 2.9 m/s | 5.4 |
| 2002 | 25.4°C | 20.7°C | 16.1°C | 31.4°C | 10.3°C | 78 mm | 79% | 2.9 m/s | 5.9 |
| 2001 | 24.7°C | 19.8°C | 14.9°C | 32.4°C | 8.6°C | 56 mm | 72% | 2.7 m/s | 5.7 |
| 2000 | 23.6°C | 19.1°C | 14.6°C | 27.2°C | 10.1°C | 88 mm | 79% | 2.5 m/s | 5.5 |
| 1999 | 28.5°C | 23.0°C | 17.5°C | 33.7°C | 12.2°C | 88 mm | 69% | 2.9 m/s | 5.9 |
| 1998 | 25.6°C | 20.9°C | 16.3°C | 30.8°C | 11.6°C | 114 mm | 76% | 2.8 m/s | 5.7 |
| 1997 | 26.0°C | 20.6°C | 15.2°C | 30.9°C | 10.6°C | 86 mm | 72% | 3.1 m/s | 5.8 |
| 1996 | 24.0°C | 19.6°C | 15.3°C | 27.1°C | 11.2°C | 110 mm | 80% | 3.1 m/s | 5.1 |
| 1995 | 28.0°C | 22.7°C | 17.4°C | 32.8°C | 11.8°C | 109 mm | 70% | 3 m/s | 5.6 |
| 1994 | 25.9°C | 21.3°C | 16.8°C | 30.2°C | 11.0°C | 74 mm | 81% | 2.6 m/s | 5.5 |
| 1993 | 26.1°C | 21.3°C | 16.6°C | 30.8°C | 11.1°C | 87 mm | 78% | 2.9 m/s | 5.5 |
| 1992 ❄️ | 22.8°C | 18.0°C | 13.3°C | 26.8°C | 7.7°C | 109 mm | 78% | 2.8 m/s | 5.4 |
| 1991 | 26.8°C | 21.2°C | 15.6°C | 32.9°C | 9.6°C | 64 mm | 69% | 2.8 m/s | 6.1 |
| 1990 | 25.0°C | 20.3°C | 15.6°C | 31.3°C | 9.2°C | 107 mm | 78% | 2.4 m/s | 5.8 |
| 1989 | 26.4°C | 20.9°C | 15.4°C | 32.2°C | 11.1°C | 48 mm | 73% | 2.4 m/s | 6.3 |
| 1988 | 27.2°C | 22.0°C | 16.8°C | 33.2°C | 9.0°C | 80 mm | 74% | 2.3 m/s | 5.4 |
| 1987 | 26.6°C | 21.4°C | 16.2°C | 32.8°C | 8.8°C | 131 mm | 75% | 2.5 m/s | 5.7 |
| 1986 | 23.9°C | 19.2°C | 14.5°C | 30.8°C | 9.5°C | 112 mm | 79% | 2.6 m/s | 5.3 |
| 1985 | 24.6°C | 19.6°C | 14.5°C | 30.2°C | 10.7°C | 107 mm | 76% | 2.8 m/s | 5.9 |
| 1984 | 25.4°C | 20.7°C | 16.0°C | 29.5°C | 11.2°C | 72 mm | 75% | 3.1 m/s | 5 |
| 1983 | 26.1°C | 20.8°C | 15.5°C | 30.6°C | 8.9°C | 69 mm | 76% | 2.9 m/s | — |
| 1982 | 26.5°C | 20.7°C | 15.0°C | 31.8°C | 7.2°C | 67 mm | 70% | 3 m/s | — |
| 1981 | 26.2°C | 21.1°C | 16.1°C | 29.9°C | 10.1°C | 89 mm | 76% | 2.7 m/s | — |
Actual recorded July data for each year, 1981–2025 — sourced from NASA POWER.
The average high in July is around 26.1°C with lows near 16.3°C (mean 21.2°C), based on 45 years of NASA POWER data.
July averages 93 mm of rainfall in Longueuil, about average for rainfall. The wettest on record was 165 mm in 2023.
The hottest July reached 36.6°C in 2020. The coldest dipped to 7.2°C in 1982.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average July temperatures have risen by about 1.9°C. Daytime highs moved from 25.8°C to 27.5°C and overnight lows from 15.4°C to 17.4°C over the same span.
July is one of the warmer months of the year in Longueuil and about average for rainfall, so plan for around 26.1°C daytime highs and 16.3°C at night.
Not quite — July is the 12th coolest month in Longueuil, averaging 21.2°C.
For July in Longueuil, pack light layers you can adjust through the day, with typical highs of 26.1°C and lows of 16.3°C. Bring an umbrella or light rain jacket too.
Relative humidity in July averages 75% — quite humid.
Average wind speed in July is 2.6 m/s. The windiest July on record averaged 3.1 m/s (1984).
The wettest July on record was 2023 with 165 mm. On average, July sees 93 mm.
All figures are derived from NASA POWER (Prediction Of Worldwide Energy Resources), based on MERRA-2 satellite reanalysis, covering 1981–2025.
Explore how the weather in Longueuil behaves each July, based on 45 years of NASA POWER climate data from 1981 to 2025. This page breaks down average temperatures, rainfall, humidity, wind and solar radiation for July specifically, along with year-by-year records and how the month has changed over the decades.
