May is one of the warmer months of the year in Gravenhurst, with average highs near 18°C and lows around 5.4°C (mean 11.7°C). It is about average for rainfall, averaging 52 mm of rainfall and 72% relative humidity across the period.
May is one of the warmer months of the year in Gravenhurst. Across 45 years of records, the warmest May in Gravenhurst was 2024 — when the month averaged 15.2°C — while the coldest was 1997 at 6.9°C. Typical May days reach 18°C with nights near 5.4°C. The long-term trend is warming, about 0.5°C per decade.
May is about average for rainfall in Gravenhurst, averaging 52 mm of rainfall. The wettest May on record was 1983 with 131 mm, while the driest was 2021 at 8 mm.
Relative humidity in Gravenhurst during May averages 72%. The most humid May was 2004 at 82%, and the least humid was 2023 at 58%.
May receives about 5.5 kWh/m²/day of solar energy in Gravenhurst. The sunniest May was 2023 at 6.4 kWh/m²/day, and the cloudiest was 1984 at 4.3.
Average wind speed in Gravenhurst during May is 0.4 m/s. The windiest Mays were 2023, 2024 and 2025, among others at 0.4 m/s, while the calmest were 2007, 2011 and 2018, among others at 0.3 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 11.3°C | 11.1°C | 10.6°C | 13.0°C | 12.9°C | +1.6°C |
| Avg High | 17.3°C | 17.3°C | 16.5°C | 19.7°C | 19.7°C | +2.4°C |
| Avg Low | 5.3°C | 4.8°C | 4.7°C | 6.2°C | 6.1°C | +0.8°C |
| Avg Rain | 65 mm | 64 mm | 67 mm | 32 mm | 18 mm | -46 mm |
May temperatures in Gravenhurst have risen by about 3.2°C between 1981–1985 and 2021–2025.
May has ranged from a record low of -4.9°C (2020) to a record high of 32.6°C (2010).
Rainfall in May is about average for rainfall, averaging 52 mm, with a wettest year of 131 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0.7°C per decade while lows rose 0.3°C per decade, widening the gap between day and night.
A good time to visit Gravenhurst
May is a good time to visit Gravenhurst, with days averaging 18°C and nights around 5.4°C (mean 11.7°C, warmer than Gravenhurst'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 | 18.6°C | 12.3°C | 6.0°C | 28.8°C | 0.0°C | 24 mm | 67% | 0.4 m/s | 5.3 |
| 2024 🔥 | 22.0°C | 15.2°C | 8.5°C | 29.9°C | 3.8°C | 24 mm | 67% | 0.4 m/s | 5.7 |
| 2023 | 19.9°C | 12.5°C | 5.1°C | 31.9°C | -1.1°C | 21 mm | 58% | 0.4 m/s | 6.4 |
| 2022 | 21.4°C | 14.0°C | 6.6°C | 31.4°C | 0.8°C | 20 mm | 64% | 0.4 m/s | 5.9 |
| 2021 | 19.2°C | 12.3°C | 5.4°C | 29.0°C | -3.8°C | 8 mm | 60% | 0.4 m/s | 5.9 |
| 2020 | 17.2°C | 11.1°C | 4.9°C | 31.8°C | -4.9°C | 12 mm | 66% | 0.4 m/s | 5.7 |
| 2019 | 16.1°C | 10.0°C | 3.9°C | 24.2°C | -1.3°C | 55 mm | 74% | 0.4 m/s | 4.7 |
| 2018 | 21.9°C | 14.3°C | 6.7°C | 31.4°C | -0.9°C | 28 mm | 66% | 0.3 m/s | 6.2 |
| 2017 | 16.5°C | 11.0°C | 5.6°C | 26.5°C | -1.7°C | 54 mm | 74% | 0.4 m/s | 4.8 |
| 2016 | 19.3°C | 12.4°C | 5.6°C | 30.3°C | -2.2°C | 16 mm | 67% | 0.4 m/s | 6.2 |
| 2015 | 20.8°C | 13.7°C | 6.5°C | 28.5°C | -1.6°C | 26 mm | 67% | 0.4 m/s | 5.7 |
| 2014 | 18.7°C | 12.1°C | 5.5°C | 25.8°C | -2.3°C | 25 mm | 70% | 0.4 m/s | 5.6 |
| 2013 | 20.6°C | 13.7°C | 6.8°C | 29.0°C | -0.2°C | 34 mm | 65% | 0.4 m/s | 6 |
| 2012 | 22.2°C | 15.0°C | 7.7°C | 31.7°C | 0.8°C | 17 mm | 63% | 0.4 m/s | 5.8 |
| 2011 | 19.4°C | 12.9°C | 6.4°C | 29.7°C | -1.0°C | 38 mm | 73% | 0.3 m/s | 4.5 |
| 2010 | 21.4°C | 14.4°C | 7.5°C | 32.6°C | -2.0°C | 30 mm | 67% | 0.4 m/s | 5.9 |
| 2009 | 16.8°C | 10.3°C | 3.9°C | 23.7°C | -1.2°C | 41 mm | 71% | 0.4 m/s | 5.8 |
| 2008 | 14.8°C | 9.2°C | 3.6°C | 21.2°C | -1.2°C | 60 mm | 73% | 0.4 m/s | 5.5 |
| 2007 | 18.8°C | 11.8°C | 4.8°C | 27.3°C | -1.5°C | 38 mm | 68% | 0.3 m/s | 6 |
| 2006 | 18.8°C | 12.9°C | 7.1°C | 32.1°C | -0.5°C | 38 mm | 73% | 0.4 m/s | 5.2 |
| 2005 | 16.5°C | 10.1°C | 3.8°C | 24.3°C | -3.0°C | 15 mm | 71% | 0.4 m/s | 6 |
| 2004 | 15.9°C | 10.3°C | 4.7°C | 25.2°C | -3.5°C | 121 mm | 82% | 0.3 m/s | 4.7 |
| 2003 | 15.5°C | 10.3°C | 5.2°C | 20.4°C | -1.3°C | 73 mm | 81% | 0.3 m/s | 4.9 |
| 2002 | 13.5°C | 8.0°C | 2.5°C | 23.5°C | -3.2°C | 121 mm | 80% | 0.4 m/s | 5.2 |
| 2001 | 17.6°C | 12.1°C | 6.5°C | 24.0°C | 0.5°C | 87 mm | 79% | 0.3 m/s | 5.7 |
| 2000 | 16.6°C | 10.8°C | 5.0°C | 23.3°C | -0.2°C | 78 mm | 80% | 0.3 m/s | 4.8 |
| 1999 | 19.9°C | 13.2°C | 6.6°C | 26.4°C | 1.4°C | 75 mm | 70% | 0.3 m/s | 5.9 |
| 1998 | 21.3°C | 14.8°C | 8.3°C | 30.2°C | 2.7°C | 32 mm | 71% | 0.4 m/s | 6 |
| 1997 ❄️ | 12.0°C | 6.9°C | 1.8°C | 21.4°C | -3.3°C | 61 mm | 79% | 0.4 m/s | 4.8 |
| 1996 | 16.0°C | 9.5°C | 2.9°C | 24.2°C | -2.7°C | 51 mm | 69% | 0.4 m/s | 5.6 |
| 1995 | 17.7°C | 11.1°C | 4.5°C | 23.9°C | -3.4°C | 42 mm | 69% | 0.3 m/s | 5.5 |
| 1994 | 16.1°C | 10.0°C | 3.9°C | 25.6°C | -2.3°C | 114 mm | 74% | 0.4 m/s | 5.4 |
| 1993 | 17.2°C | 11.0°C | 4.8°C | 27.9°C | -0.9°C | 83 mm | 74% | 0.3 m/s | 5.2 |
| 1992 | 17.9°C | 11.2°C | 4.6°C | 25.9°C | -0.4°C | 42 mm | 69% | 0.4 m/s | 6 |
| 1991 | 19.6°C | 13.4°C | 7.2°C | 27.1°C | -2.8°C | 72 mm | 77% | 0.3 m/s | 5.8 |
| 1990 | 15.6°C | 9.7°C | 3.8°C | 23.1°C | -3.1°C | 71 mm | 72% | 0.4 m/s | 5.2 |
| 1989 | 17.7°C | 11.7°C | 5.8°C | 27.6°C | -0.8°C | 49 mm | 73% | 0.4 m/s | 5.1 |
| 1988 | 20.4°C | 13.5°C | 6.5°C | 29.2°C | -0.3°C | 46 mm | 66% | 0.3 m/s | 5.8 |
| 1987 | 20.0°C | 13.2°C | 6.5°C | 28.8°C | -2.1°C | 26 mm | 66% | 0.3 m/s | 5.8 |
| 1986 | 19.0°C | 13.1°C | 7.2°C | 28.2°C | -3.6°C | 45 mm | 74% | 0.3 m/s | 5.4 |
| 1985 | 16.6°C | 10.7°C | 4.7°C | 23.3°C | -3.5°C | 74 mm | 81% | 0.3 m/s | 5.4 |
| 1984 | 13.6°C | 8.4°C | 3.3°C | 22.1°C | -3.0°C | 67 mm | 79% | 0.4 m/s | 4.3 |
| 1983 🌧️ | 13.6°C | 8.2°C | 2.8°C | 22.3°C | -4.1°C | 131 mm | 81% | 0.4 m/s | — |
| 1982 | 19.2°C | 13.2°C | 7.1°C | 23.9°C | 0.1°C | 60 mm | 81% | 0.3 m/s | — |
| 1981 | 16.0°C | 10.1°C | 4.2°C | 26.3°C | -3.3°C | 84 mm | 76% | 0.3 m/s | — |
Actual recorded May data for each year, 1981–2025 — sourced from NASA POWER.
The average high in May is around 18°C with lows near 5.4°C (mean 11.7°C), based on 45 years of NASA POWER data.
May averages 52 mm of rainfall in Gravenhurst, about average for rainfall. The wettest on record was 131 mm in 1983.
The hottest May reached 32.6°C in 2010. The coldest dipped to -4.9°C in 2020.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average May temperatures have risen by about 3.2°C. Daytime highs moved from 15.8°C to 20.2°C and overnight lows from 4.4°C to 6.3°C over the same span.
May is one of the warmer months of the year in Gravenhurst and about average for rainfall, so plan for around 18°C daytime highs and 5.4°C at night.
Not quite — May is the 8th coolest month in Gravenhurst, averaging 11.7°C.
For May in Gravenhurst, pack warm layers and a jacket for chilly mornings, with typical highs of 18°C and lows of 5.4°C. Bring an umbrella or light rain jacket too.
Relative humidity in May averages 72% — moderately humid.
Average wind speed in May is 0.4 m/s. The windiest May on record averaged 0.4 m/s (1983).
The wettest May on record was 1983 with 131 mm. On average, May sees 52 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 Gravenhurst 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.
