May is one of the warmer months of the year in High River, with average highs near 16.8°C and lows around 3.5°C (mean 10.2°C). It is a relatively wet time of year, averaging 64 mm of rainfall and 60% relative humidity across the period.
May is one of the warmer months of the year in High River. Across 45 years of records, the warmest May in High River was 2023 — when the month averaged 14.7°C — while the coldest was 1996 at 6.8°C. Typical May days reach 16.8°C with nights near 3.5°C. The long-term May temperature trend is broadly flat.
May is a relatively wet time of year in High River, averaging 64 mm of rainfall. The wettest May on record was 1981 with 139 mm, while the driest was 2001 at 15 mm.
Relative humidity in High River during May averages 60%. The most humid May was 1981 at 70%, and the least humid was 2001 at 45%.
May receives about 5.8 kWh/m²/day of solar energy in High River. The sunniest Mays were 1998, 2001 and 2005 at 6.5 kWh/m²/day, and the cloudiest were 2010 and 2024 at 5.2.
Average wind speed in High River during May is 1.5 m/s. The windiest May was 2001 at 1.8 m/s, while the calmest was 2014 at 1.2 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 10.4°C | 10.0°C | 9.9°C | 10.0°C | 10.6°C | +0.2°C |
| Avg High | 17.2°C | 16.7°C | 16.5°C | 16.6°C | 17.4°C | +0.2°C |
| Avg Low | 3.7°C | 3.3°C | 3.3°C | 3.5°C | 3.9°C | +0.2°C |
| Avg Rain | 54 mm | 76 mm | 56 mm | 69 mm | 64 mm | +10 mm |
May temperatures in High River have risen by about 1.3°C between 1981–1985 and 2021–2025.
May has ranged from a record low of -5.8°C (2013) to a record high of 33.2°C (1986).
Rainfall in May is a relatively wet time of year, averaging 64 mm, with a wettest year of 139 mm.
A good time to visit High River
May is a good time to visit High River, with days averaging 16.8°C and nights around 3.5°C (mean 10.2°C, warmer than High River'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 | 19.8°C | 12.4°C | 5.0°C | 30.1°C | 0.1°C | 63 mm | 60% | 1.4 m/s | 6.4 |
| 2024 | 15.0°C | 9.0°C | 2.9°C | 25.9°C | -4.0°C | 94 mm | 67% | 1.5 m/s | 5.2 |
| 2023 🔥 | 22.1°C | 14.7°C | 7.3°C | 28.9°C | 2.6°C | 28 mm | 58% | 1.3 m/s | 6.4 |
| 2022 | 15.6°C | 9.1°C | 2.5°C | 22.1°C | -2.2°C | 38 mm | 58% | 1.5 m/s | 5.7 |
| 2021 | 15.7°C | 9.2°C | 2.7°C | 27.1°C | -2.5°C | 60 mm | 60% | 1.5 m/s | 5.6 |
| 2020 | 16.0°C | 9.4°C | 2.7°C | 24.6°C | -4.5°C | 103 mm | 64% | 1.5 m/s | 5.6 |
| 2019 | 15.3°C | 8.9°C | 2.6°C | 25.2°C | -3.9°C | 78 mm | 66% | 1.4 m/s | 5.4 |
| 2018 | 20.5°C | 13.7°C | 6.8°C | 28.7°C | 0.2°C | 43 mm | 61% | 1.5 m/s | 6.3 |
| 2017 | 18.4°C | 11.6°C | 4.9°C | 26.9°C | -0.7°C | 69 mm | 63% | 1.5 m/s | 6.1 |
| 2016 | 17.5°C | 10.7°C | 3.9°C | 27.9°C | -1.8°C | 77 mm | 58% | 1.5 m/s | 6.1 |
| 2015 | 16.1°C | 9.3°C | 2.6°C | 24.7°C | -3.7°C | 41 mm | 60% | 1.4 m/s | 6.1 |
| 2014 | 15.6°C | 9.1°C | 2.6°C | 25.1°C | -5.1°C | 72 mm | 65% | 1.2 m/s | 5.6 |
| 2013 | 17.7°C | 11.2°C | 4.6°C | 26.9°C | -5.8°C | 94 mm | 60% | 1.4 m/s | 5.7 |
| 2012 | 16.3°C | 9.7°C | 3.1°C | 28.0°C | -2.4°C | 51 mm | 57% | 1.5 m/s | 5.8 |
| 2011 | 15.0°C | 8.6°C | 2.2°C | 21.0°C | -1.9°C | 90 mm | 64% | 1.6 m/s | 5.4 |
| 2010 | 13.5°C | 7.5°C | 1.5°C | 26.6°C | -4.8°C | 74 mm | 60% | 1.6 m/s | 5.2 |
| 2009 | 16.7°C | 9.8°C | 2.9°C | 28.0°C | -4.1°C | 40 mm | 56% | 1.5 m/s | 6.2 |
| 2008 | 16.5°C | 10.3°C | 4.1°C | 29.5°C | -1.6°C | 106 mm | 64% | 1.5 m/s | 5.3 |
| 2007 | 17.2°C | 10.4°C | 3.6°C | 25.2°C | -0.2°C | 108 mm | 63% | 1.5 m/s | 5.7 |
| 2006 | 18.2°C | 11.5°C | 4.8°C | 29.4°C | -3.4°C | 43 mm | 60% | 1.5 m/s | 6.1 |
| 2005 | 17.7°C | 10.6°C | 3.5°C | 23.4°C | -4.7°C | 32 mm | 57% | 1.6 m/s | 6.5 |
| 2004 | 14.4°C | 8.3°C | 2.1°C | 23.4°C | -4.1°C | 84 mm | 64% | 1.4 m/s | 5.4 |
| 2003 | 15.1°C | 9.0°C | 2.9°C | 28.3°C | -3.5°C | 46 mm | 63% | 1.4 m/s | 5.5 |
| 2002 | 13.9°C | 7.3°C | 0.8°C | 23.6°C | -5.7°C | 65 mm | 62% | 1.7 m/s | 5.4 |
| 2001 | 19.3°C | 12.1°C | 4.9°C | 31.0°C | -0.7°C | 15 mm | 45% | 1.8 m/s | 6.5 |
| 2000 | 16.4°C | 9.7°C | 2.9°C | 22.3°C | -2.0°C | 22 mm | 53% | 1.4 m/s | 5.9 |
| 1999 | 15.8°C | 9.4°C | 3.0°C | 28.2°C | -4.4°C | 53 mm | 55% | 1.6 m/s | 5.8 |
| 1998 | 19.6°C | 12.7°C | 5.7°C | 26.1°C | 1.4°C | 91 mm | 57% | 1.5 m/s | 6.5 |
| 1997 | 16.5°C | 9.7°C | 2.8°C | 26.5°C | -3.7°C | 104 mm | 62% | 1.6 m/s | 5.6 |
| 1996 ❄️ | 12.7°C | 6.8°C | 0.9°C | 22.5°C | -5.7°C | 66 mm | 67% | 1.4 m/s | 5.3 |
| 1995 | 16.1°C | 9.2°C | 2.4°C | 29.1°C | -2.8°C | 90 mm | 62% | 1.4 m/s | 5.8 |
| 1994 | 17.9°C | 11.1°C | 4.2°C | 27.1°C | -0.9°C | 66 mm | 61% | 1.4 m/s | 5.6 |
| 1993 | 18.8°C | 11.7°C | 4.5°C | 27.6°C | -1.7°C | 60 mm | 61% | 1.5 m/s | 5.9 |
| 1992 | 18.4°C | 10.8°C | 3.3°C | 29.3°C | -4.4°C | 59 mm | 55% | 1.6 m/s | 5.9 |
| 1991 | 15.9°C | 9.6°C | 3.2°C | 24.7°C | -3.9°C | 79 mm | 63% | 1.4 m/s | 5.5 |
| 1990 | 15.7°C | 9.4°C | 3.1°C | 26.5°C | -2.4°C | 94 mm | 64% | 1.5 m/s | 5.6 |
| 1989 | 16.7°C | 9.9°C | 3.0°C | 24.4°C | -1.3°C | 44 mm | 54% | 1.6 m/s | 5.9 |
| 1988 | 19.9°C | 12.7°C | 5.6°C | 29.5°C | -2.2°C | 26 mm | 47% | 1.7 m/s | 5.9 |
| 1987 | 19.6°C | 12.3°C | 5.0°C | 28.1°C | -4.3°C | 17 mm | 51% | 1.6 m/s | 6.1 |
| 1986 | 17.9°C | 11.1°C | 4.3°C | 33.2°C | -5.2°C | 60 mm | 61% | 1.5 m/s | 5.8 |
| 1985 | 18.8°C | 11.8°C | 4.7°C | 27.5°C | -0.9°C | 52 mm | 57% | 1.4 m/s | 6.2 |
| 1984 | 14.6°C | 8.3°C | 1.9°C | 26.6°C | -2.5°C | 51 mm | 59% | 1.6 m/s | 5.7 |
| 1983 | 16.7°C | 9.8°C | 2.9°C | 26.8°C | -2.9°C | 31 mm | 62% | 1.5 m/s | — |
| 1982 | 15.0°C | 8.4°C | 1.8°C | 25.4°C | -4.1°C | 67 mm | 61% | 1.7 m/s | — |
| 1981 🌧️ | 15.5°C | 9.7°C | 4.0°C | 23.5°C | -0.4°C | 139 mm | 70% | 1.5 m/s | — |
Actual recorded May data for each year, 1981–2025 — sourced from NASA POWER.
The average high in May is around 16.8°C with lows near 3.5°C (mean 10.2°C), based on 45 years of NASA POWER data.
May averages 64 mm of rainfall in High River, a relatively wet time of year. The wettest on record was 139 mm in 1981.
The hottest May reached 33.2°C in 1986. The coldest dipped to -5.8°C in 2013.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average May temperatures have risen by about 1.3°C. Daytime highs moved from 16.1°C to 17.6°C and overnight lows from 3.1°C to 4.1°C over the same span.
May is one of the warmer months of the year in High River and a relatively wet time of year, so plan for around 16.8°C daytime highs and 3.5°C at night.
Not quite — May is the 8th coolest month in High River, averaging 10.2°C.
For May in High River, pack warm layers and a jacket for chilly mornings, with typical highs of 16.8°C and lows of 3.5°C. Bring an umbrella or light rain jacket too.
Relative humidity in May averages 60% — moderately humid.
Average wind speed in May is 1.5 m/s. The windiest May on record averaged 1.8 m/s (2001).
The wettest May on record was 1981 with 139 mm. On average, May sees 64 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 High River 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.
