May is one of the warmer months of the year in Winnipeg, with average highs near 18.3°C and lows around 6°C (mean 12.2°C). It is a relatively wet time of year, averaging 70 mm of rainfall and 66% relative humidity across the period.
May is one of the warmer months of the year in Winnipeg. Across 45 years of records, the warmest May in Winnipeg was 2023 — when the month averaged 16.1°C — while the coldest was 2004 at 8.1°C. Typical May days reach 18.3°C with nights near 6°C. The long-term May temperature trend is broadly flat.
May is a relatively wet time of year in Winnipeg, averaging 70 mm of rainfall. The wettest May on record was 2004 with 167 mm, while the driest were 2020 and 2023 at 19 mm.
Relative humidity in Winnipeg during May averages 66%. The most humid May was 2022 at 75%, and the least humid was 2025 at 58%.
May receives about 5.6 kWh/m²/day of solar energy in Winnipeg. The sunniest May was 2025 at 6.5 kWh/m²/day, and the cloudiest was 2022 at 4.8.
Average wind speed in Winnipeg during May is 3.5 m/s. The windiest May was 1999 at 4.2 m/s, while the calmest were 1981 and 1995 at 2.9 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 12.8°C | 12.0°C | 11.1°C | 12.3°C | 13.0°C | +0.2°C |
| Avg High | 19.3°C | 18.4°C | 17.0°C | 18.2°C | 19.2°C | -0.1°C |
| Avg Low | 6.2°C | 5.6°C | 5.2°C | 6.4°C | 6.8°C | +0.6°C |
| Avg Rain | 55 mm | 66 mm | 82 mm | 79 mm | 62 mm | +7 mm |
May temperatures in Winnipeg have risen by about 1.6°C between 1981–1985 and 2021–2025.
May has ranged from a record low of -5.8°C (1989) to a record high of 34.4°C (2025).
Rainfall in May is a relatively wet time of year, averaging 70 mm, with a wettest year of 167 mm.
Daytime highs and overnight lows have shifted differently — highs fell about 0.1°C per decade while lows rose 0.2°C per decade, narrowing the gap between day and night.
A good time to visit Winnipeg
May is a good time to visit Winnipeg, with days averaging 18.3°C and nights around 6°C (mean 12.2°C, warmer than Winnipeg's yearly average) and moderate 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 | 22.5°C | 15.1°C | 7.7°C | 34.4°C | -0.9°C | 25 mm | 58% | 3.5 m/s | 6.5 |
| 2024 | 17.4°C | 12.0°C | 6.6°C | 27.2°C | 1.7°C | 101 mm | 71% | 3.4 m/s | 4.9 |
| 2023 🔥 | 22.6°C | 16.1°C | 9.7°C | 31.3°C | 0.0°C | 19 mm | 64% | 3.5 m/s | 5.9 |
| 2022 | 16.8°C | 11.2°C | 5.7°C | 23.6°C | -2.5°C | 158 mm | 75% | 3.8 m/s | 4.8 |
| 2021 | 18.8°C | 11.9°C | 5.1°C | 30.4°C | -1.6°C | 48 mm | 62% | 3.5 m/s | 6 |
| 2020 | 17.3°C | 11.5°C | 5.7°C | 27.6°C | -4.1°C | 19 mm | 63% | 3.6 m/s | 6.2 |
| 2019 | 16.6°C | 10.5°C | 4.4°C | 26.9°C | -2.9°C | 33 mm | 62% | 3.2 m/s | 6.1 |
| 2018 | 22.3°C | 15.4°C | 8.5°C | 30.4°C | -2.0°C | 53 mm | 63% | 3.1 m/s | 6.2 |
| 2017 | 17.7°C | 11.9°C | 6.1°C | 22.5°C | 0.8°C | 30 mm | 66% | 3.5 m/s | 5.8 |
| 2016 | 20.0°C | 14.0°C | 7.9°C | 31.5°C | -3.0°C | 62 mm | 65% | 3.2 m/s | 5.7 |
| 2015 | 17.6°C | 11.4°C | 5.1°C | 27.7°C | -1.5°C | 74 mm | 67% | 3.4 m/s | 5.6 |
| 2014 | 17.1°C | 11.6°C | 6.1°C | 30.5°C | -2.5°C | 72 mm | 71% | 3.1 m/s | 5.1 |
| 2013 | 17.2°C | 11.3°C | 5.4°C | 25.0°C | -4.7°C | 109 mm | 68% | 3.8 m/s | 5.3 |
| 2012 | 18.5°C | 12.8°C | 7.2°C | 27.8°C | 2.8°C | 110 mm | 67% | 3.5 m/s | 5.5 |
| 2011 | 16.7°C | 11.3°C | 5.9°C | 24.9°C | -4.2°C | 86 mm | 72% | 3.6 m/s | 5.1 |
| 2010 | 18.0°C | 12.7°C | 7.3°C | 27.7°C | -2.2°C | 165 mm | 69% | 3.3 m/s | 5.1 |
| 2009 | 14.5°C | 8.7°C | 2.9°C | 21.9°C | -3.1°C | 72 mm | 69% | 3.6 m/s | 5.6 |
| 2008 | 15.6°C | 9.5°C | 3.4°C | 24.3°C | -3.3°C | 50 mm | 64% | 3.3 m/s | 6.2 |
| 2007 | 19.3°C | 13.2°C | 7.1°C | 29.0°C | 1.1°C | 105 mm | 70% | 3.9 m/s | 5 |
| 2006 | 18.7°C | 13.1°C | 7.5°C | 28.7°C | -1.0°C | 60 mm | 70% | 3.3 m/s | 5.3 |
| 2005 | 16.3°C | 11.1°C | 5.8°C | 26.3°C | -3.1°C | 69 mm | 71% | 3.5 m/s | 4.9 |
| 2004 ❄️ 🌧️ | 13.5°C | 8.1°C | 2.7°C | 23.6°C | -5.0°C | 167 mm | 69% | 3.7 m/s | 4.9 |
| 2003 | 20.5°C | 13.8°C | 7.1°C | 26.2°C | -1.5°C | 79 mm | 59% | 3.4 m/s | 5.7 |
| 2002 | 15.2°C | 8.8°C | 2.4°C | 28.3°C | -3.4°C | 54 mm | 62% | 3.8 m/s | 6.1 |
| 2001 | 18.7°C | 13.1°C | 7.4°C | 25.2°C | 2.0°C | 109 mm | 71% | 3.8 m/s | 5.4 |
| 2000 | 18.1°C | 12.0°C | 5.9°C | 28.7°C | -0.9°C | 57 mm | 66% | 3.2 m/s | 5.4 |
| 1999 | 17.6°C | 12.3°C | 7.0°C | 27.8°C | 0.8°C | 131 mm | 69% | 4.2 m/s | 5 |
| 1998 | 20.7°C | 14.1°C | 7.5°C | 26.5°C | 2.2°C | 115 mm | 65% | 3.2 m/s | 6.1 |
| 1997 | 15.5°C | 9.2°C | 2.8°C | 27.0°C | -3.1°C | 42 mm | 65% | 3.5 m/s | 6 |
| 1996 | 16.6°C | 10.3°C | 4.0°C | 24.3°C | -3.1°C | 76 mm | 64% | 3 m/s | 5.7 |
| 1995 | 17.4°C | 11.1°C | 4.9°C | 30.5°C | -1.1°C | 56 mm | 66% | 2.9 m/s | 5.6 |
| 1994 | 20.1°C | 13.3°C | 6.5°C | 30.0°C | -1.3°C | 45 mm | 62% | 3.7 m/s | 6.1 |
| 1993 | 18.4°C | 12.0°C | 5.6°C | 28.4°C | -0.4°C | 37 mm | 61% | 3.4 m/s | 5.5 |
| 1992 | 19.0°C | 12.2°C | 5.4°C | 30.0°C | -2.0°C | 44 mm | 67% | 3.6 m/s | 5.8 |
| 1991 | 20.8°C | 14.7°C | 8.7°C | 29.7°C | -2.5°C | 70 mm | 67% | 3.3 m/s | 5.3 |
| 1990 | 17.5°C | 10.7°C | 4.0°C | 27.0°C | -4.7°C | 44 mm | 63% | 3.1 m/s | 6.2 |
| 1989 | 20.5°C | 13.4°C | 6.2°C | 29.8°C | -5.8°C | 48 mm | 61% | 3.4 m/s | 6 |
| 1988 | 21.5°C | 14.9°C | 8.2°C | 30.6°C | -0.4°C | 46 mm | 62% | 3.8 m/s | 5.7 |
| 1987 | 21.8°C | 14.9°C | 8.0°C | 31.4°C | 0.5°C | 46 mm | 62% | 3.5 m/s | 5.9 |
| 1986 | 20.0°C | 13.5°C | 7.0°C | 31.4°C | -4.6°C | 48 mm | 69% | 3.4 m/s | 6 |
| 1985 | 20.2°C | 13.7°C | 7.3°C | 28.2°C | 2.0°C | 117 mm | 66% | 3.4 m/s | 5.6 |
| 1984 | 16.7°C | 10.3°C | 4.0°C | 30.3°C | -3.6°C | 43 mm | 63% | 3.6 m/s | 5.9 |
| 1983 | 15.1°C | 8.9°C | 2.6°C | 22.4°C | -4.9°C | 45 mm | 64% | 3.8 m/s | — |
| 1982 | 18.9°C | 13.2°C | 7.5°C | 28.4°C | -1.5°C | 51 mm | 70% | 3.4 m/s | — |
| 1981 | 19.1°C | 12.2°C | 5.4°C | 27.8°C | -4.5°C | 54 mm | 60% | 2.9 m/s | — |
Actual recorded May data for each year, 1981–2025 — sourced from NASA POWER.
The average high in May is around 18.3°C with lows near 6°C (mean 12.2°C), based on 45 years of NASA POWER data.
May averages 70 mm of rainfall in Winnipeg, a relatively wet time of year. The wettest on record was 167 mm in 2004.
The hottest May reached 34.4°C in 2025. The coldest dipped to -5.8°C in 1989.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average May temperatures have risen by about 1.6°C. Daytime highs moved from 18°C to 19.6°C and overnight lows from 5.4°C to 7°C over the same span.
May is one of the warmer months of the year in Winnipeg and a relatively wet time of year, so plan for around 18.3°C daytime highs and 6°C at night.
Not quite — May is the 8th coolest month in Winnipeg, averaging 12.2°C.
For May in Winnipeg, pack warm layers and a jacket for chilly mornings, with typical highs of 18.3°C and lows of 6°C. Bring an umbrella or light rain jacket too.
Relative humidity in May averages 66% — moderately humid.
Average wind speed in May is 3.5 m/s. The windiest May on record averaged 4.2 m/s (1999).
The wettest May on record was 2004 with 167 mm. On average, May sees 70 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 Winnipeg 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.
