May is one of the warmer months of the year in Medicine Hat, with average highs near 18.7°C and lows around 5.7°C (mean 12.2°C). It is a relatively wet time of year, averaging 50 mm of rainfall and 55% relative humidity across the period.
May is one of the warmer months of the year in Medicine Hat. Across 45 years of records, the warmest May in Medicine Hat was 2023 — when the month averaged 16.6°C — while the coldest was 1996 at 8.8°C. Typical May days reach 18.7°C with nights near 5.7°C. The long-term May temperature trend is broadly flat.
May is a relatively wet time of year in Medicine Hat, averaging 50 mm of rainfall. The wettest May on record was 2024 with 120 mm, while the driest was 2015 at 16 mm.
Relative humidity in Medicine Hat during May averages 55%. The most humid May was 2024 at 66%, and the least humid was 2001 at 41%.
May receives about 5.9 kWh/m²/day of solar energy in Medicine Hat. The sunniest May was 1998 at 6.7 kWh/m²/day, and the cloudiest was 2010 at 5.2.
Average wind speed in Medicine Hat during May is 3.4 m/s. The windiest May was 2001 at 4.4 m/s, while the calmest was 1996 at 2.8 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 12.5°C | 12.0°C | 11.9°C | 12.0°C | 12.8°C | +0.3°C |
| Avg High | 19.2°C | 18.6°C | 18.3°C | 18.3°C | 19.1°C | -0.1°C |
| Avg Low | 5.9°C | 5.5°C | 5.5°C | 5.7°C | 6.4°C | +0.5°C |
| Avg Rain | 55 mm | 48 mm | 43 mm | 57 mm | 50 mm | -5 mm |
May temperatures in Medicine Hat have risen by about 1.1°C between 1981–1985 and 2021–2025.
May has ranged from a record low of -5.8°C (1996) to a record high of 33.6°C (1986).
Rainfall in May is a relatively wet time of year, averaging 50 mm, with a wettest year of 120 mm.
A good time to visit Medicine Hat
May is a good time to visit Medicine Hat, with days averaging 18.7°C and nights around 5.7°C (mean 12.2°C, warmer than Medicine Hat'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 | 21.1°C | 14.6°C | 8.1°C | 31.0°C | 2.7°C | 23 mm | 56% | 3.2 m/s | 6.2 |
| 2024 🌧️ | 16.5°C | 10.8°C | 5.0°C | 27.2°C | -2.3°C | 120 mm | 66% | 3.3 m/s | 5.5 |
| 2023 🔥 | 23.6°C | 16.6°C | 9.6°C | 31.6°C | 3.9°C | 31 mm | 52% | 2.9 m/s | 6.2 |
| 2022 | 18.2°C | 11.9°C | 5.5°C | 25.2°C | -0.6°C | 37 mm | 51% | 3.5 m/s | 5.8 |
| 2021 | 16.9°C | 11.1°C | 5.3°C | 30.0°C | -2.9°C | 53 mm | 57% | 3.4 m/s | 5.5 |
| 2020 | 18.5°C | 11.8°C | 5.1°C | 28.5°C | -2.3°C | 34 mm | 55% | 3.5 m/s | 5.8 |
| 2019 | 17.3°C | 10.9°C | 4.5°C | 30.4°C | -3.1°C | 33 mm | 55% | 3 m/s | 5.8 |
| 2018 | 22.8°C | 15.8°C | 8.7°C | 30.1°C | 0.7°C | 46 mm | 55% | 3 m/s | 6.3 |
| 2017 | 20.5°C | 13.7°C | 6.8°C | 30.8°C | 1.5°C | 32 mm | 53% | 3.5 m/s | 6.3 |
| 2016 | 18.7°C | 12.4°C | 6.0°C | 29.8°C | -1.8°C | 74 mm | 57% | 3.3 m/s | 5.9 |
| 2015 | 18.9°C | 11.8°C | 4.6°C | 27.5°C | -2.1°C | 16 mm | 48% | 3.1 m/s | 6.4 |
| 2014 | 17.7°C | 11.4°C | 5.2°C | 28.9°C | -4.1°C | 41 mm | 57% | 2.9 m/s | 5.7 |
| 2013 | 19.0°C | 12.9°C | 6.8°C | 28.5°C | -4.5°C | 106 mm | 59% | 3.1 m/s | 5.8 |
| 2012 | 17.6°C | 11.6°C | 5.6°C | 30.7°C | -0.9°C | 55 mm | 55% | 3.7 m/s | 5.7 |
| 2011 | 16.3°C | 10.4°C | 4.4°C | 22.8°C | -0.8°C | 60 mm | 62% | 3.3 m/s | 5.4 |
| 2010 | 14.5°C | 9.2°C | 3.9°C | 29.5°C | -3.1°C | 103 mm | 62% | 3.5 m/s | 5.2 |
| 2009 | 18.4°C | 11.6°C | 4.9°C | 30.5°C | -2.7°C | 28 mm | 52% | 3.4 m/s | 6.3 |
| 2008 | 18.5°C | 12.3°C | 6.1°C | 29.0°C | -1.3°C | 52 mm | 58% | 3.2 m/s | 5.4 |
| 2007 | 18.9°C | 12.6°C | 6.3°C | 28.3°C | 2.3°C | 51 mm | 59% | 3.6 m/s | 5.5 |
| 2006 | 19.6°C | 13.6°C | 7.6°C | 31.1°C | -3.4°C | 56 mm | 59% | 3.7 m/s | 5.8 |
| 2005 | 18.5°C | 11.7°C | 5.0°C | 26.5°C | -5.4°C | 20 mm | 53% | 3.7 m/s | 6.6 |
| 2004 | 15.9°C | 9.9°C | 3.8°C | 26.0°C | -3.2°C | 63 mm | 59% | 3.3 m/s | 5.6 |
| 2003 | 17.0°C | 11.0°C | 4.9°C | 29.6°C | -3.5°C | 61 mm | 60% | 3.5 m/s | 5.8 |
| 2002 | 16.6°C | 9.9°C | 3.2°C | 28.8°C | -4.3°C | 48 mm | 51% | 4 m/s | 6.2 |
| 2001 | 21.1°C | 14.3°C | 7.5°C | 33.0°C | 1.9°C | 20 mm | 41% | 4.4 m/s | 6.4 |
| 2000 | 18.7°C | 12.3°C | 6.0°C | 26.4°C | 0.3°C | 28 mm | 48% | 3.5 m/s | 6.1 |
| 1999 | 16.8°C | 10.9°C | 5.1°C | 31.0°C | -1.8°C | 65 mm | 55% | 3.7 m/s | 5.6 |
| 1998 | 21.4°C | 14.5°C | 7.6°C | 28.5°C | 1.8°C | 35 mm | 48% | 3.3 m/s | 6.7 |
| 1997 | 18.9°C | 12.2°C | 5.4°C | 27.8°C | -1.0°C | 47 mm | 54% | 3.7 m/s | 5.6 |
| 1996 ❄️ | 14.5°C | 8.8°C | 3.0°C | 20.0°C | -5.8°C | 49 mm | 64% | 2.8 m/s | 5.3 |
| 1995 | 17.9°C | 11.0°C | 4.2°C | 30.7°C | -3.2°C | 47 mm | 55% | 2.9 m/s | 6.1 |
| 1994 | 19.5°C | 12.9°C | 6.4°C | 28.9°C | 0.5°C | 49 mm | 57% | 3.3 m/s | 5.7 |
| 1993 | 20.5°C | 13.6°C | 6.7°C | 29.8°C | 1.2°C | 29 mm | 52% | 3.1 m/s | 6.1 |
| 1992 | 20.2°C | 13.1°C | 6.1°C | 30.0°C | -2.0°C | 34 mm | 50% | 3.4 m/s | 5.7 |
| 1991 | 18.1°C | 11.7°C | 5.4°C | 26.6°C | -4.4°C | 68 mm | 57% | 3.2 m/s | 5.8 |
| 1990 | 18.0°C | 11.5°C | 5.0°C | 26.4°C | -3.6°C | 58 mm | 57% | 3.2 m/s | 5.9 |
| 1989 | 18.7°C | 11.9°C | 5.1°C | 28.2°C | -0.3°C | 56 mm | 52% | 3.7 m/s | 5.8 |
| 1988 | 22.5°C | 15.3°C | 8.0°C | 32.4°C | -0.1°C | 21 mm | 44% | 3.7 m/s | 5.7 |
| 1987 | 20.8°C | 14.2°C | 7.6°C | 28.4°C | -2.4°C | 23 mm | 52% | 3.7 m/s | 6.2 |
| 1986 | 18.6°C | 12.1°C | 5.6°C | 33.6°C | -2.6°C | 94 mm | 62% | 3.7 m/s | 5.8 |
| 1985 | 21.2°C | 14.3°C | 7.4°C | 28.2°C | 1.6°C | 48 mm | 51% | 3.2 m/s | 6.3 |
| 1984 | 17.3°C | 11.0°C | 4.7°C | 31.6°C | -1.9°C | 34 mm | 53% | 3.9 m/s | 5.9 |
| 1983 | 18.0°C | 11.3°C | 4.5°C | 29.4°C | -4.1°C | 40 mm | 57% | 3.4 m/s | — |
| 1982 | 16.5°C | 9.9°C | 3.3°C | 28.9°C | -1.7°C | 101 mm | 59% | 3.7 m/s | — |
| 1981 | 19.0°C | 12.8°C | 6.7°C | 27.3°C | 0.2°C | 80 mm | 58% | 3.4 m/s | — |
Actual recorded May data for each year, 1981–2025 — sourced from NASA POWER.
The average high in May is around 18.7°C with lows near 5.7°C (mean 12.2°C), based on 45 years of NASA POWER data.
May averages 50 mm of rainfall in Medicine Hat, a relatively wet time of year. The wettest on record was 120 mm in 2024.
The hottest May reached 33.6°C in 1986. The coldest dipped to -5.8°C in 1996.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average May temperatures have risen by about 1.1°C. Daytime highs moved from 18.4°C to 19.3°C and overnight lows from 5.3°C to 6.7°C over the same span.
May is one of the warmer months of the year in Medicine Hat and a relatively wet time of year, so plan for around 18.7°C daytime highs and 5.7°C at night.
Not quite — May is the 8th coolest month in Medicine Hat, averaging 12.2°C.
For May in Medicine Hat, pack warm layers and a jacket for chilly mornings, with typical highs of 18.7°C and lows of 5.7°C. Bring an umbrella or light rain jacket too.
Relative humidity in May averages 55% — moderately humid.
Average wind speed in May is 3.4 m/s. The windiest May on record averaged 4.4 m/s (2001).
The wettest May on record was 2024 with 120 mm. On average, May sees 50 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 Medicine Hat 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.
