May is one of the warmer months of the year in Red Deer, with average highs near 16.1°C and lows around 3.6°C (mean 9.9°C). It is a relatively wet time of year, averaging 65 mm of rainfall and 65% relative humidity across the period.
May is one of the warmer months of the year in Red Deer. Across 45 years of records, the warmest May in Red Deer was 2023 — when the month averaged 14.9°C — while the coldest was 1996 at 6.8°C. Typical May days reach 16.1°C with nights near 3.6°C. The long-term trend is warming, about 0.2°C per decade.
May is a relatively wet time of year in Red Deer, averaging 65 mm of rainfall. The wettest May on record was 2016 with 124 mm, while the driest was 1988 at 20 mm.
Relative humidity in Red Deer during May averages 65%. The most humid May was 1996 at 72%, and the least humid was 1988 at 52%.
May receives about 5.7 kWh/m²/day of solar energy in Red Deer. The sunniest Mays were 1998 and 2015 at 6.4 kWh/m²/day, and the cloudiest was 1996 at 4.8.
Average wind speed in Red Deer during May is 2.9 m/s. The windiest May was 2001 at 3.5 m/s, while the calmest was 2014 at 2.4 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 9.8°C | 9.8°C | 9.3°C | 10.1°C | 10.5°C | +0.7°C |
| Avg High | 16.3°C | 16.0°C | 15.4°C | 16.3°C | 16.9°C | +0.6°C |
| Avg Low | 3.4°C | 3.6°C | 3.1°C | 3.9°C | 4.1°C | +0.7°C |
| Avg Rain | 58 mm | 68 mm | 63 mm | 69 mm | 66 mm | +8 mm |
May temperatures in Red Deer have risen by about 1.6°C between 1981–1985 and 2021–2025.
May has ranged from a record low of -6.9°C (1996) to a record high of 31.3°C (1986).
Rainfall in May is a relatively wet time of year, averaging 65 mm, with a wettest year of 124 mm.
A good time to visit Red Deer
May is a good time to visit Red Deer, with days averaging 16.1°C and nights around 3.6°C (mean 9.9°C, warmer than Red Deer's yearly average) and moderate rainfall. August and July 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 | 18.7°C | 11.8°C | 4.9°C | 29.9°C | 0.0°C | 83 mm | 66% | 2.9 m/s | 6 |
| 2024 | 14.8°C | 9.0°C | 3.2°C | 25.5°C | -2.9°C | 86 mm | 69% | 3.1 m/s | 5.3 |
| 2023 🔥 | 22.1°C | 14.9°C | 7.6°C | 28.1°C | 2.6°C | 34 mm | 61% | 2.7 m/s | 6.2 |
| 2022 | 15.4°C | 9.2°C | 3.1°C | 22.5°C | -1.9°C | 32 mm | 64% | 2.6 m/s | 5.9 |
| 2021 | 15.1°C | 9.1°C | 3.0°C | 24.1°C | -3.7°C | 76 mm | 67% | 2.8 m/s | 5.6 |
| 2020 | 15.3°C | 9.1°C | 3.0°C | 24.8°C | -3.3°C | 87 mm | 68% | 3.1 m/s | 5.5 |
| 2019 | 15.2°C | 9.1°C | 3.0°C | 26.3°C | -4.0°C | 48 mm | 65% | 2.6 m/s | 5.7 |
| 2018 | 19.9°C | 13.4°C | 6.8°C | 27.0°C | 1.3°C | 83 mm | 64% | 2.8 m/s | 6.2 |
| 2017 | 18.1°C | 11.9°C | 5.6°C | 26.8°C | -0.3°C | 59 mm | 66% | 2.9 m/s | 6 |
| 2016 🌧️ | 16.7°C | 10.4°C | 4.0°C | 27.1°C | -2.0°C | 124 mm | 64% | 3 m/s | 5.7 |
| 2015 | 16.7°C | 9.5°C | 2.4°C | 24.9°C | -3.8°C | 29 mm | 57% | 2.9 m/s | 6.4 |
| 2014 | 14.2°C | 8.7°C | 3.2°C | 24.4°C | -4.3°C | 64 mm | 68% | 2.4 m/s | 5.5 |
| 2013 | 18.0°C | 11.6°C | 5.2°C | 26.5°C | -5.4°C | 88 mm | 63% | 2.7 m/s | 5.8 |
| 2012 | 15.4°C | 9.2°C | 3.1°C | 26.1°C | -1.4°C | 54 mm | 63% | 2.8 m/s | 5.8 |
| 2011 | 15.9°C | 9.7°C | 3.5°C | 22.7°C | -1.2°C | 52 mm | 63% | 3 m/s | 5.8 |
| 2010 | 13.1°C | 7.7°C | 2.2°C | 27.9°C | -4.0°C | 88 mm | 66% | 2.8 m/s | 4.9 |
| 2009 | 15.3°C | 8.5°C | 1.8°C | 24.9°C | -4.5°C | 36 mm | 61% | 2.9 m/s | 6.1 |
| 2008 | 16.0°C | 9.9°C | 3.9°C | 25.9°C | -3.9°C | 77 mm | 69% | 2.9 m/s | 5.5 |
| 2007 | 15.4°C | 9.2°C | 3.0°C | 23.9°C | -0.4°C | 111 mm | 71% | 3.2 m/s | 5.6 |
| 2006 | 17.3°C | 11.2°C | 5.0°C | 29.3°C | -2.7°C | 50 mm | 65% | 2.9 m/s | 5.9 |
| 2005 | 16.5°C | 10.1°C | 3.8°C | 22.3°C | -4.9°C | 59 mm | 64% | 3 m/s | 6.3 |
| 2004 | 13.7°C | 8.0°C | 2.3°C | 24.5°C | -6.9°C | 56 mm | 64% | 2.7 m/s | 5.5 |
| 2003 | 13.9°C | 8.4°C | 2.8°C | 26.0°C | -4.3°C | 82 mm | 69% | 2.9 m/s | 5.5 |
| 2002 | 13.3°C | 7.1°C | 0.8°C | 23.0°C | -6.3°C | 72 mm | 63% | 3.1 m/s | 5.7 |
| 2001 | 18.1°C | 11.5°C | 4.9°C | 28.2°C | -1.4°C | 38 mm | 52% | 3.5 m/s | 5.9 |
| 2000 | 14.7°C | 8.7°C | 2.7°C | 21.9°C | -1.8°C | 49 mm | 63% | 2.7 m/s | 5.6 |
| 1999 | 14.4°C | 8.8°C | 3.1°C | 27.2°C | -3.0°C | 61 mm | 64% | 2.8 m/s | 5.4 |
| 1998 | 20.4°C | 13.5°C | 6.5°C | 26.5°C | 1.5°C | 47 mm | 57% | 2.7 m/s | 6.4 |
| 1997 | 15.6°C | 9.4°C | 3.3°C | 24.9°C | -3.6°C | 65 mm | 66% | 2.8 m/s | 5.3 |
| 1996 ❄️ | 12.1°C | 6.8°C | 1.4°C | 22.0°C | -6.9°C | 57 mm | 72% | 2.5 m/s | 4.8 |
| 1995 | 16.5°C | 9.7°C | 3.0°C | 29.0°C | -2.5°C | 49 mm | 63% | 2.5 m/s | 5.8 |
| 1994 | 16.9°C | 10.8°C | 4.6°C | 26.0°C | -1.7°C | 78 mm | 64% | 2.8 m/s | 5.4 |
| 1993 | 18.3°C | 11.5°C | 4.8°C | 29.6°C | -0.4°C | 55 mm | 62% | 3 m/s | 5.7 |
| 1992 | 15.3°C | 9.0°C | 2.7°C | 27.3°C | -3.8°C | 96 mm | 66% | 2.7 m/s | 5.3 |
| 1991 | 15.6°C | 9.6°C | 3.7°C | 23.3°C | -4.1°C | 96 mm | 66% | 2.7 m/s | 5.6 |
| 1990 | 15.0°C | 9.0°C | 3.1°C | 23.6°C | -3.0°C | 74 mm | 69% | 2.8 m/s | 5.6 |
| 1989 | 15.6°C | 9.1°C | 2.7°C | 24.5°C | -1.9°C | 62 mm | 62% | 2.9 m/s | 5.8 |
| 1988 | 19.7°C | 12.5°C | 5.2°C | 29.9°C | -1.9°C | 20 mm | 52% | 3 m/s | 5.5 |
| 1987 | 18.0°C | 10.9°C | 3.9°C | 27.4°C | -5.7°C | 49 mm | 61% | 2.7 m/s | 5.9 |
| 1986 | 16.6°C | 10.1°C | 3.7°C | 31.3°C | -5.9°C | 74 mm | 69% | 3 m/s | 5.6 |
| 1985 | 17.2°C | 10.8°C | 4.5°C | 25.6°C | -1.7°C | 49 mm | 63% | 2.7 m/s | 6 |
| 1984 | 13.1°C | 7.5°C | 1.9°C | 22.2°C | -3.2°C | 74 mm | 69% | 3 m/s | 4.9 |
| 1983 | 15.2°C | 9.0°C | 2.8°C | 24.9°C | -3.9°C | 37 mm | 70% | 2.8 m/s | — |
| 1982 | 15.1°C | 8.4°C | 1.7°C | 25.0°C | -3.6°C | 57 mm | 64% | 3.3 m/s | — |
| 1981 | 15.9°C | 10.3°C | 4.6°C | 23.4°C | -1.7°C | 100 mm | 70% | 2.8 m/s | — |
Actual recorded May data for each year, 1981–2025 — sourced from NASA POWER.
The average high in May is around 16.1°C with lows near 3.6°C (mean 9.9°C), based on 45 years of NASA POWER data.
May averages 65 mm of rainfall in Red Deer, a relatively wet time of year. The wettest on record was 124 mm in 2016.
The hottest May reached 31.3°C in 1986. The coldest dipped to -6.9°C in 1996.
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 15.3°C to 17.2°C and overnight lows from 3.1°C to 4.4°C over the same span.
May is one of the warmer months of the year in Red Deer and a relatively wet time of year, so plan for around 16.1°C daytime highs and 3.6°C at night.
Not quite — May is the 8th coolest month in Red Deer, averaging 9.9°C.
For May in Red Deer, pack warm layers and a jacket for chilly mornings, with typical highs of 16.1°C and lows of 3.6°C. Bring an umbrella or light rain jacket too.
Relative humidity in May averages 65% — moderately humid.
Average wind speed in May is 2.9 m/s. The windiest May on record averaged 3.5 m/s (2001).
The wettest May on record was 2016 with 124 mm. On average, May sees 65 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 Red Deer 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.
