May is one of the warmer months of the year in Portage La Prairie, with average highs near 18.2°C and lows around 6.4°C (mean 12.3°C). It is a relatively wet time of year, averaging 72 mm of rainfall and 64% relative humidity across the period.
May is one of the warmer months of the year in Portage La Prairie. Across 45 years of records, the warmest Mays in Portage La Prairie were 2018 and 2023 — when the month averaged 16°C — while the coldest was 2004 at 8.6°C. Typical May days reach 18.2°C with nights near 6.4°C. The long-term May temperature trend is broadly flat.
May is a relatively wet time of year in Portage La Prairie, averaging 72 mm of rainfall. The wettest May on record was 2022 with 199 mm, while the driest was 2020 at 23 mm.
Relative humidity in Portage La Prairie during May averages 64%. The most humid May was 2022 at 75%, and the least humid was 2003 at 56%.
May receives about 5.7 kWh/m²/day of solar energy in Portage La Prairie. The sunniest May was 2018 at 6.3 kWh/m²/day, and the cloudiest was 2022 at 4.9.
Average wind speed in Portage La Prairie during May is 3.8 m/s. The windiest May was 1999 at 4.6 m/s, while the calmest was 1996 at 3.1 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 12.8°C | 12.1°C | 11.4°C | 12.5°C | 13.0°C | +0.2°C |
| Avg High | 19.1°C | 18.1°C | 17.1°C | 18.1°C | 18.8°C | -0.3°C |
| Avg Low | 6.5°C | 6.1°C | 5.7°C | 7.0°C | 7.2°C | +0.7°C |
| Avg Rain | 50 mm | 71 mm | 76 mm | 86 mm | 80 mm | +30 mm |
May temperatures in Portage La Prairie have risen by about 1.7°C between 1981–1985 and 2021–2025.
May has ranged from a record low of -5.5°C (1983) to a record high of 32.7°C (2025).
Rainfall in May is a relatively wet time of year, averaging 72 mm, with a wettest year of 199 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 Portage La Prairie
May is a good time to visit Portage La Prairie, with days averaging 18.2°C and nights around 6.4°C (mean 12.3°C, warmer than Portage La Prairie'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 | 21.9°C | 15.0°C | 8.0°C | 32.7°C | -0.5°C | 49 mm | 59% | 3.7 m/s | 6.2 |
| 2024 | 17.2°C | 12.0°C | 6.9°C | 27.2°C | 3.0°C | 121 mm | 71% | 3.7 m/s | 5 |
| 2023 | 21.8°C | 16.0°C | 10.2°C | 30.8°C | 0.7°C | 29 mm | 66% | 3.7 m/s | 5.8 |
| 2022 🌧️ | 16.3°C | 11.2°C | 6.0°C | 23.1°C | -2.0°C | 199 mm | 75% | 4.4 m/s | 4.9 |
| 2021 | 18.5°C | 12.1°C | 5.8°C | 30.3°C | -0.7°C | 57 mm | 58% | 3.7 m/s | 6.1 |
| 2020 | 16.9°C | 11.6°C | 6.2°C | 27.1°C | -3.1°C | 23 mm | 63% | 4 m/s | 6.1 |
| 2019 | 16.5°C | 10.7°C | 4.9°C | 28.8°C | -2.3°C | 35 mm | 60% | 3.6 m/s | 6.2 |
| 2018 🔥 | 22.7°C | 16.0°C | 9.3°C | 30.4°C | -1.3°C | 37 mm | 59% | 3.5 m/s | 6.3 |
| 2017 | 17.5°C | 12.1°C | 6.8°C | 23.8°C | 1.5°C | 51 mm | 66% | 3.9 m/s | 5.9 |
| 2016 | 20.2°C | 14.4°C | 8.5°C | 31.6°C | -1.9°C | 80 mm | 63% | 3.9 m/s | 5.7 |
| 2015 | 17.8°C | 11.8°C | 5.7°C | 28.5°C | -0.7°C | 77 mm | 63% | 3.8 m/s | 5.7 |
| 2014 | 17.2°C | 11.8°C | 6.4°C | 30.6°C | -1.8°C | 73 mm | 69% | 3.6 m/s | 5.5 |
| 2013 | 17.3°C | 11.8°C | 6.3°C | 26.0°C | -4.9°C | 124 mm | 66% | 4.3 m/s | 5.3 |
| 2012 | 18.4°C | 12.9°C | 7.5°C | 28.9°C | 3.4°C | 108 mm | 65% | 4 m/s | 5.4 |
| 2011 | 16.2°C | 11.4°C | 6.5°C | 24.4°C | -3.5°C | 95 mm | 71% | 4.1 m/s | 5.1 |
| 2010 | 17.3°C | 12.5°C | 7.7°C | 27.5°C | -0.7°C | 177 mm | 69% | 3.8 m/s | 5.1 |
| 2009 | 14.6°C | 9.0°C | 3.3°C | 22.1°C | -2.6°C | 75 mm | 69% | 3.9 m/s | 5.8 |
| 2008 | 15.9°C | 10.0°C | 4.1°C | 24.5°C | -2.0°C | 47 mm | 61% | 3.6 m/s | 6.1 |
| 2007 | 18.8°C | 13.0°C | 7.1°C | 29.0°C | 1.3°C | 92 mm | 69% | 4.3 m/s | 5 |
| 2006 | 19.1°C | 13.4°C | 7.7°C | 29.0°C | -0.4°C | 56 mm | 69% | 3.7 m/s | 5.4 |
| 2005 | 16.3°C | 11.2°C | 6.1°C | 26.0°C | -3.4°C | 73 mm | 69% | 4.1 m/s | 5.2 |
| 2004 ❄️ | 13.8°C | 8.6°C | 3.3°C | 23.6°C | -3.1°C | 136 mm | 67% | 4.1 m/s | 5.1 |
| 2003 | 20.5°C | 14.2°C | 7.9°C | 27.1°C | -0.5°C | 62 mm | 56% | 3.9 m/s | 5.7 |
| 2002 | 15.6°C | 9.3°C | 3.1°C | 28.2°C | -3.4°C | 37 mm | 58% | 4.2 m/s | 6.2 |
| 2001 | 18.6°C | 13.1°C | 7.7°C | 27.9°C | 3.2°C | 113 mm | 69% | 4.2 m/s | 5.6 |
| 2000 | 17.7°C | 12.1°C | 6.4°C | 28.4°C | -0.3°C | 74 mm | 64% | 3.6 m/s | 5.5 |
| 1999 | 17.3°C | 12.1°C | 7.0°C | 28.3°C | 1.2°C | 158 mm | 69% | 4.6 m/s | 5 |
| 1998 | 20.1°C | 13.9°C | 7.8°C | 27.0°C | 2.0°C | 101 mm | 65% | 3.5 m/s | 5.9 |
| 1997 | 15.4°C | 9.4°C | 3.4°C | 26.5°C | -2.8°C | 48 mm | 65% | 3.8 m/s | 6.1 |
| 1996 | 15.9°C | 10.3°C | 4.6°C | 23.8°C | -2.6°C | 72 mm | 64% | 3.1 m/s | 5.5 |
| 1995 | 17.0°C | 11.1°C | 5.2°C | 29.6°C | -0.9°C | 59 mm | 65% | 3.3 m/s | 5.5 |
| 1994 | 20.2°C | 13.6°C | 7.0°C | 29.2°C | -0.8°C | 45 mm | 60% | 4.1 m/s | 6.1 |
| 1993 | 18.1°C | 12.1°C | 6.0°C | 28.0°C | 0.5°C | 68 mm | 60% | 3.6 m/s | 5.7 |
| 1992 | 19.1°C | 12.5°C | 5.9°C | 31.2°C | -0.2°C | 39 mm | 64% | 3.9 m/s | 5.9 |
| 1991 | 20.2°C | 14.6°C | 9.0°C | 29.9°C | -1.8°C | 73 mm | 66% | 3.7 m/s | 5.3 |
| 1990 | 17.3°C | 11.0°C | 4.7°C | 26.8°C | -4.9°C | 46 mm | 62% | 3.4 m/s | 6 |
| 1989 | 20.5°C | 13.8°C | 7.1°C | 29.7°C | -4.1°C | 42 mm | 57% | 3.7 m/s | 6 |
| 1988 | 21.3°C | 14.8°C | 8.3°C | 31.5°C | -1.1°C | 49 mm | 62% | 4 m/s | 5.3 |
| 1987 | 22.1°C | 15.2°C | 8.4°C | 31.6°C | 1.5°C | 38 mm | 59% | 3.9 m/s | 5.9 |
| 1986 | 19.7°C | 13.5°C | 7.2°C | 31.1°C | -3.5°C | 49 mm | 68% | 3.9 m/s | 6.1 |
| 1985 | 20.2°C | 14.1°C | 8.0°C | 26.9°C | 3.3°C | 65 mm | 64% | 3.7 m/s | 5.7 |
| 1984 | 16.5°C | 10.4°C | 4.2°C | 31.4°C | -5.3°C | 36 mm | 62% | 3.9 m/s | 5.7 |
| 1983 | 15.2°C | 8.9°C | 2.5°C | 23.8°C | -5.5°C | 43 mm | 64% | 4.1 m/s | — |
| 1982 | 18.4°C | 12.9°C | 7.5°C | 28.7°C | -1.6°C | 66 mm | 70% | 3.7 m/s | — |
| 1981 | 18.1°C | 11.9°C | 5.6°C | 28.4°C | -4.0°C | 60 mm | 62% | 3.3 m/s | — |
Actual recorded May data for each year, 1981–2025 — sourced from NASA POWER.
The average high in May is around 18.2°C with lows near 6.4°C (mean 12.3°C), based on 45 years of NASA POWER data.
May averages 72 mm of rainfall in Portage La Prairie, a relatively wet time of year. The wettest on record was 199 mm in 2022.
The hottest May reached 32.7°C in 2025. The coldest dipped to -5.5°C in 1983.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average May temperatures have risen by about 1.7°C. Daytime highs moved from 17.7°C to 19.1°C and overnight lows from 5.6°C to 7.4°C over the same span.
May is one of the warmer months of the year in Portage La Prairie and a relatively wet time of year, so plan for around 18.2°C daytime highs and 6.4°C at night.
Not quite — May is the 8th coolest month in Portage La Prairie, averaging 12.3°C.
For May in Portage La Prairie, pack warm layers and a jacket for chilly mornings, with typical highs of 18.2°C and lows of 6.4°C. Bring an umbrella or light rain jacket too.
Relative humidity in May averages 64% — moderately humid.
Average wind speed in May is 3.8 m/s. The windiest May on record averaged 4.6 m/s (1999).
The wettest May on record was 2022 with 199 mm. On average, May sees 72 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 Portage La Prairie 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.
