May is one of the warmer months of the year in Joliette, with average highs near 17.2°C and lows around 5.6°C (mean 11.4°C). It is about average for rainfall, averaging 84 mm of rainfall and 78% relative humidity across the period.
May is one of the warmer months of the year in Joliette. Across 45 years of records, the warmest May in Joliette was 1998 — when the month averaged 14.6°C — while the coldest was 1997 at 8.3°C. Typical May days reach 17.2°C with nights near 5.6°C. The long-term trend is warming, about 0.3°C per decade.
May is about average for rainfall in Joliette, averaging 84 mm of rainfall. The wettest May on record was 1983 with 186 mm, while the driest was 2021 at 26 mm.
Relative humidity in Joliette during May averages 78%. The most humid May was 2011 at 86%, and the least humid was 1996 at 72%.
May receives about 5.3 kWh/m²/day of solar energy in Joliette. The sunniest Mays were 1992, 2018 and 2023 at 6.2 kWh/m²/day, and the cloudiest was 1984 at 4.2.
Average wind speed in Joliette during May is 1.2 m/s. The windiest May was 1997 at 1.4 m/s, while the calmest were 1982, 2003 and 2012 at 1 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 11.1°C | 11.3°C | 10.7°C | 12.1°C | 12.2°C | +1.1°C |
| Avg High | 16.8°C | 17.3°C | 16.4°C | 17.8°C | 18.2°C | +1.4°C |
| Avg Low | 5.4°C | 5.3°C | 5.1°C | 6.4°C | 6.2°C | +0.8°C |
| Avg Rain | 96 mm | 66 mm | 99 mm | 94 mm | 52 mm | -44 mm |
May temperatures in Joliette have risen by about 2.1°C between 1981–1985 and 2021–2025.
May has ranged from a record low of -5.2°C (2020) to a record high of 30.8°C (2010).
Rainfall in May is about average for rainfall, averaging 84 mm, with a wettest year of 186 mm.
A good time to visit Joliette
May is a good time to visit Joliette, with days averaging 17.2°C and nights around 5.6°C (mean 11.4°C, warmer than Joliette's yearly average) and higher rainfall. July and August are marginally more temperate, but May still suits most travellers.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 17.8°C | 12.3°C | 6.9°C | 25.3°C | -2.1°C | 71 mm | 78% | 1.1 m/s | 4.6 |
| 2024 | 19.5°C | 14.1°C | 8.7°C | 27.8°C | 2.4°C | 55 mm | 78% | 1.1 m/s | 5.3 |
| 2023 | 17.6°C | 11.2°C | 4.8°C | 28.2°C | -3.3°C | 48 mm | 73% | 1.3 m/s | 6.2 |
| 2022 | 19.9°C | 13.4°C | 7.0°C | 28.7°C | -1.8°C | 76 mm | 76% | 1.1 m/s | 5.8 |
| 2021 | 18.1°C | 12.0°C | 5.9°C | 29.1°C | -2.0°C | 26 mm | 73% | 1.1 m/s | 5.6 |
| 2020 | 16.2°C | 10.1°C | 4.1°C | 30.2°C | -5.2°C | 34 mm | 76% | 1.2 m/s | 6.1 |
| 2019 | 15.0°C | 9.7°C | 4.4°C | 21.7°C | -2.7°C | 102 mm | 80% | 1.1 m/s | 5 |
| 2018 | 18.8°C | 12.1°C | 5.4°C | 26.3°C | -1.1°C | 53 mm | 78% | 1.2 m/s | 6.2 |
| 2017 | 15.5°C | 10.8°C | 6.2°C | 26.6°C | -1.1°C | 156 mm | 84% | 1.3 m/s | 4.4 |
| 2016 | 17.6°C | 11.6°C | 5.7°C | 27.1°C | -2.4°C | 77 mm | 79% | 1.1 m/s | 5.4 |
| 2015 | 19.7°C | 13.4°C | 7.0°C | 25.5°C | -2.0°C | 88 mm | 78% | 1.2 m/s | 5.4 |
| 2014 | 17.3°C | 11.8°C | 6.3°C | 25.7°C | -1.8°C | 104 mm | 82% | 1.1 m/s | 5.3 |
| 2013 | 18.9°C | 12.9°C | 7.0°C | 26.3°C | -2.7°C | 100 mm | 78% | 1.2 m/s | 5.3 |
| 2012 | 19.2°C | 13.4°C | 7.6°C | 27.5°C | 0.5°C | 87 mm | 79% | 1 m/s | 5.2 |
| 2011 | 16.7°C | 11.8°C | 6.9°C | 25.0°C | 1.0°C | 130 mm | 86% | 1.2 m/s | 4.4 |
| 2010 | 19.4°C | 13.2°C | 7.0°C | 30.8°C | -2.2°C | 46 mm | 76% | 1.1 m/s | 6 |
| 2009 | 15.8°C | 10.2°C | 4.5°C | 24.7°C | -1.2°C | 94 mm | 79% | 1.2 m/s | 5.1 |
| 2008 | 15.7°C | 10.0°C | 4.3°C | 21.8°C | -2.5°C | 74 mm | 77% | 1.1 m/s | 5.7 |
| 2007 | 17.5°C | 11.1°C | 4.8°C | 27.5°C | -1.4°C | 60 mm | 76% | 1.2 m/s | 6 |
| 2006 | 17.3°C | 12.5°C | 7.6°C | 28.2°C | -2.9°C | 157 mm | 84% | 1.1 m/s | 4.5 |
| 2005 | 14.6°C | 9.3°C | 4.0°C | 23.6°C | -4.1°C | 55 mm | 80% | 1.2 m/s | 4.8 |
| 2004 | 17.0°C | 11.1°C | 5.2°C | 24.1°C | -4.0°C | 103 mm | 80% | 1.2 m/s | 5.2 |
| 2003 | 16.5°C | 10.9°C | 5.3°C | 24.5°C | -2.6°C | 104 mm | 79% | 1 m/s | 5.3 |
| 2002 | 14.5°C | 8.9°C | 3.3°C | 24.5°C | -2.1°C | 141 mm | 78% | 1.3 m/s | 4.8 |
| 2001 | 18.7°C | 12.9°C | 7.1°C | 26.4°C | 0.5°C | 77 mm | 79% | 1.1 m/s | 5.5 |
| 2000 | 16.2°C | 10.5°C | 4.8°C | 25.0°C | -3.3°C | 123 mm | 81% | 1.2 m/s | 4.7 |
| 1999 | 20.4°C | 14.0°C | 7.6°C | 28.4°C | -1.5°C | 57 mm | 74% | 1.1 m/s | 6.1 |
| 1998 🔥 | 20.5°C | 14.6°C | 8.7°C | 27.1°C | 2.8°C | 89 mm | 75% | 1.1 m/s | 5.7 |
| 1997 ❄️ | 13.8°C | 8.3°C | 2.8°C | 21.7°C | -3.3°C | 65 mm | 77% | 1.4 m/s | 4.5 |
| 1996 | 16.0°C | 9.9°C | 3.8°C | 25.9°C | -1.5°C | 44 mm | 72% | 1.2 m/s | 5.7 |
| 1995 | 17.7°C | 11.3°C | 5.0°C | 26.4°C | -4.8°C | 49 mm | 73% | 1.2 m/s | 5 |
| 1994 | 16.4°C | 10.1°C | 3.9°C | 27.1°C | -3.3°C | 75 mm | 76% | 1.3 m/s | 5.4 |
| 1993 | 17.2°C | 11.5°C | 5.7°C | 25.2°C | 0.2°C | 48 mm | 78% | 1.2 m/s | 4.7 |
| 1992 | 17.0°C | 10.4°C | 3.9°C | 25.9°C | -2.5°C | 59 mm | 77% | 1.1 m/s | 6.2 |
| 1991 | 18.9°C | 13.0°C | 7.2°C | 26.0°C | 0.4°C | 93 mm | 79% | 1.2 m/s | 5.4 |
| 1990 | 15.0°C | 9.6°C | 4.2°C | 22.4°C | -1.4°C | 83 mm | 79% | 1.2 m/s | 5.3 |
| 1989 | 17.3°C | 12.1°C | 6.9°C | 27.6°C | 0.0°C | 99 mm | 83% | 1.2 m/s | 4.4 |
| 1988 | 18.3°C | 12.2°C | 6.2°C | 24.1°C | -0.3°C | 60 mm | 79% | 1.1 m/s | 5.3 |
| 1987 | 16.8°C | 10.7°C | 4.5°C | 28.2°C | -5.0°C | 88 mm | 78% | 1.2 m/s | 5.3 |
| 1986 | 17.8°C | 12.2°C | 6.6°C | 27.1°C | -4.4°C | 133 mm | 81% | 1.2 m/s | 4.9 |
| 1985 | 16.4°C | 10.3°C | 4.2°C | 25.0°C | -2.9°C | 46 mm | 76% | 1.2 m/s | 5.6 |
| 1984 | 14.2°C | 9.3°C | 4.4°C | 22.3°C | -3.0°C | 109 mm | 81% | 1.3 m/s | 4.2 |
| 1983 🌧️ | 14.3°C | 9.1°C | 3.9°C | 20.0°C | -3.1°C | 186 mm | 84% | 1.1 m/s | — |
| 1982 | 18.7°C | 12.5°C | 6.3°C | 25.4°C | 0.8°C | 32 mm | 79% | 1 m/s | — |
| 1981 | 17.1°C | 11.1°C | 5.2°C | 24.0°C | -3.6°C | 113 mm | 80% | 1.1 m/s | — |
Actual recorded May data for each year, 1981–2025 — sourced from NASA POWER.
The average high in May is around 17.2°C with lows near 5.6°C (mean 11.4°C), based on 45 years of NASA POWER data.
May averages 84 mm of rainfall in Joliette, about average for rainfall. The wettest on record was 186 mm in 1983.
The hottest May reached 30.8°C in 2010. The coldest dipped to -5.2°C in 2020.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average May temperatures have risen by about 2.1°C. Daytime highs moved from 16.1°C to 18.6°C and overnight lows from 4.8°C to 6.7°C over the same span.
May is one of the warmer months of the year in Joliette and about average for rainfall, so plan for around 17.2°C daytime highs and 5.6°C at night.
Not quite — May is the 8th coolest month in Joliette, averaging 11.4°C.
For May in Joliette, pack warm layers and a jacket for chilly mornings, with typical highs of 17.2°C and lows of 5.6°C. Bring an umbrella or light rain jacket too.
Relative humidity in May averages 78% — quite humid.
Average wind speed in May is 1.2 m/s. The windiest May on record averaged 1.4 m/s (1997).
The wettest May on record was 1983 with 186 mm. On average, May sees 84 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 Joliette behaves each May, 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 May specifically, along with year-by-year records and how the month has changed over the decades.
