May is one of the warmer months of the year in Orillia, with average highs near 16.9°C and lows around 6°C (mean 11.5°C). It is about average for rainfall, averaging 55 mm of rainfall and 74% relative humidity across the period.
May is one of the warmer months of the year in Orillia. Across 45 years of records, the warmest Mays in Orillia were 1998 and 2024 — when the month averaged 14.8°C — while the coldest was 1997 at 7°C. Typical May days reach 16.9°C with nights near 6°C. The long-term trend is warming, about 0.4°C per decade.
May is about average for rainfall in Orillia, averaging 55 mm of rainfall. The wettest May on record was 2002 with 147 mm, while the driest was 2021 at 12 mm.
Relative humidity in Orillia during May averages 74%. The most humid May was 2004 at 84%, and the least humid was 2023 at 63%.
May receives about 5.5 kWh/m²/day of solar energy in Orillia. The sunniest May was 2023 at 6.4 kWh/m²/day, and the cloudiest was 1984 at 4.3.
Average wind speed in Orillia during May is 1.3 m/s. The windiest Mays were 2017, 2020 and 2025, among others at 1.5 m/s, while the calmest were 1982 and 2007 at 1 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 11.2°C | 11.0°C | 10.4°C | 12.5°C | 12.6°C | +1.4°C |
| Avg High | 16.6°C | 16.6°C | 15.5°C | 18.1°C | 18.2°C | +1.6°C |
| Avg Low | 5.8°C | 5.5°C | 5.3°C | 7.0°C | 7.0°C | +1.2°C |
| Avg Rain | 53 mm | 60 mm | 77 mm | 46 mm | 27 mm | -26 mm |
May temperatures in Orillia have risen by about 3°C between 1981–1985 and 2021–2025.
May has ranged from a record low of -3.2°C (1983) to a record high of 30.8°C (2006).
Rainfall in May is about average for rainfall, averaging 55 mm, with a wettest year of 147 mm.
A good time to visit Orillia
May is a good time to visit Orillia, with days averaging 16.9°C and nights around 6°C (mean 11.5°C, warmer than Orillia'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 | 17.2°C | 12.0°C | 6.8°C | 26.7°C | 1.4°C | 44 mm | 72% | 1.5 m/s | 5.3 |
| 2024 | 20.2°C | 14.8°C | 9.3°C | 28.0°C | 4.7°C | 31 mm | 71% | 1.3 m/s | 5.7 |
| 2023 | 18.3°C | 12.2°C | 6.0°C | 30.7°C | 0.7°C | 22 mm | 63% | 1.2 m/s | 6.4 |
| 2022 | 19.5°C | 13.5°C | 7.6°C | 28.6°C | 1.5°C | 28 mm | 70% | 1.3 m/s | 5.9 |
| 2021 | 18.2°C | 12.3°C | 6.5°C | 28.0°C | -1.4°C | 12 mm | 64% | 1.4 m/s | 5.9 |
| 2020 | 15.8°C | 10.7°C | 5.7°C | 28.5°C | -2.9°C | 22 mm | 70% | 1.5 m/s | 5.7 |
| 2019 | 14.6°C | 9.6°C | 4.6°C | 21.0°C | -0.3°C | 69 mm | 81% | 1.4 m/s | 4.7 |
| 2018 | 20.4°C | 13.9°C | 7.4°C | 28.1°C | -0.2°C | 37 mm | 72% | 1.2 m/s | 6.2 |
| 2017 | 15.0°C | 10.7°C | 6.4°C | 24.3°C | 0.8°C | 88 mm | 79% | 1.5 m/s | 4.8 |
| 2016 | 18.1°C | 12.4°C | 6.7°C | 28.2°C | 0.5°C | 22 mm | 72% | 1.3 m/s | 6.2 |
| 2015 | 20.0°C | 13.8°C | 7.6°C | 26.4°C | 0.1°C | 31 mm | 69% | 1.4 m/s | 5.7 |
| 2014 | 17.1°C | 11.7°C | 6.3°C | 24.1°C | 1.3°C | 34 mm | 76% | 1.3 m/s | 5.6 |
| 2013 | 18.7°C | 13.1°C | 7.5°C | 27.4°C | 1.3°C | 49 mm | 72% | 1.4 m/s | 6 |
| 2012 | 20.5°C | 14.5°C | 8.5°C | 30.6°C | 2.8°C | 29 mm | 68% | 1.2 m/s | 5.8 |
| 2011 | 16.7°C | 11.6°C | 6.5°C | 26.8°C | 0.8°C | 61 mm | 81% | 1.2 m/s | 4.5 |
| 2010 | 19.4°C | 13.7°C | 8.0°C | 30.0°C | -0.9°C | 44 mm | 71% | 1.3 m/s | 5.9 |
| 2009 | 15.4°C | 9.9°C | 4.4°C | 21.5°C | -0.4°C | 58 mm | 76% | 1.4 m/s | 5.8 |
| 2008 | 13.7°C | 9.0°C | 4.2°C | 20.1°C | -0.3°C | 79 mm | 77% | 1.4 m/s | 5.5 |
| 2007 | 17.8°C | 11.7°C | 5.6°C | 27.3°C | -0.1°C | 50 mm | 71% | 1 m/s | 6 |
| 2006 | 17.5°C | 12.4°C | 7.4°C | 30.8°C | 0.4°C | 52 mm | 76% | 1.3 m/s | 5.2 |
| 2005 | 15.7°C | 10.2°C | 4.7°C | 24.2°C | -1.6°C | 14 mm | 71% | 1.1 m/s | 6 |
| 2004 | 15.1°C | 10.1°C | 5.0°C | 24.2°C | -2.6°C | 112 mm | 84% | 1.2 m/s | 4.7 |
| 2003 | 14.2°C | 9.7°C | 5.2°C | 18.3°C | -0.2°C | 78 mm | 82% | 1.2 m/s | 4.9 |
| 2002 🌧️ | 12.8°C | 8.1°C | 3.3°C | 22.1°C | -1.8°C | 147 mm | 81% | 1.5 m/s | 5.2 |
| 2001 | 16.7°C | 11.6°C | 6.5°C | 23.8°C | 0.7°C | 92 mm | 78% | 1.2 m/s | 5.7 |
| 2000 | 16.4°C | 11.3°C | 6.2°C | 23.5°C | 0.6°C | 91 mm | 79% | 1.3 m/s | 4.8 |
| 1999 | 18.8°C | 12.9°C | 7.0°C | 28.1°C | 1.5°C | 63 mm | 69% | 1.2 m/s | 5.9 |
| 1998 🔥 | 20.6°C | 14.8°C | 9.1°C | 29.7°C | 4.4°C | 33 mm | 70% | 1.2 m/s | 6 |
| 1997 ❄️ | 11.4°C | 7.0°C | 2.6°C | 20.0°C | -2.3°C | 61 mm | 79% | 1.5 m/s | 4.8 |
| 1996 | 14.9°C | 9.3°C | 3.7°C | 23.6°C | -1.7°C | 61 mm | 72% | 1.2 m/s | 5.6 |
| 1995 | 16.9°C | 11.0°C | 5.0°C | 24.7°C | -2.1°C | 33 mm | 68% | 1.3 m/s | 5.5 |
| 1994 | 15.3°C | 9.8°C | 4.3°C | 26.3°C | -1.0°C | 110 mm | 73% | 1.3 m/s | 5.4 |
| 1993 | 16.5°C | 10.8°C | 5.1°C | 27.5°C | 0.7°C | 71 mm | 71% | 1.3 m/s | 5.2 |
| 1992 | 17.5°C | 11.3°C | 5.2°C | 27.0°C | 0.8°C | 36 mm | 67% | 1.1 m/s | 6 |
| 1991 | 19.2°C | 13.6°C | 8.0°C | 27.0°C | -1.5°C | 71 mm | 77% | 1.2 m/s | 5.8 |
| 1990 | 15.2°C | 9.9°C | 4.6°C | 23.8°C | -1.3°C | 62 mm | 70% | 1.4 m/s | 5.2 |
| 1989 | 17.1°C | 11.7°C | 6.2°C | 27.1°C | -0.1°C | 34 mm | 70% | 1.3 m/s | 5.1 |
| 1988 | 19.5°C | 13.2°C | 7.0°C | 27.7°C | -0.4°C | 34 mm | 64% | 1.2 m/s | 5.8 |
| 1987 | 19.2°C | 13.2°C | 7.1°C | 28.3°C | -1.7°C | 20 mm | 65% | 1.3 m/s | 5.8 |
| 1986 | 18.6°C | 13.1°C | 7.5°C | 27.1°C | -3.1°C | 35 mm | 72% | 1.3 m/s | 5.4 |
| 1985 | 16.1°C | 10.9°C | 5.6°C | 22.2°C | -1.6°C | 63 mm | 80% | 1.2 m/s | 5.4 |
| 1984 | 12.7°C | 8.1°C | 3.4°C | 21.1°C | -2.2°C | 54 mm | 80% | 1.3 m/s | 4.3 |
| 1983 | 12.7°C | 7.9°C | 3.2°C | 19.8°C | -3.2°C | 102 mm | 82% | 1.4 m/s | — |
| 1982 | 18.3°C | 12.9°C | 7.4°C | 23.0°C | 1.1°C | 50 mm | 79% | 1 m/s | — |
| 1981 | 15.5°C | 10.1°C | 4.8°C | 25.1°C | -1.7°C | 84 mm | 75% | 1.2 m/s | — |
Actual recorded May data for each year, 1981–2025 — sourced from NASA POWER.
The average high in May is around 16.9°C with lows near 6°C (mean 11.5°C), based on 45 years of NASA POWER data.
May averages 55 mm of rainfall in Orillia, about average for rainfall. The wettest on record was 147 mm in 2002.
The hottest May reached 30.8°C in 2006. The coldest dipped to -3.2°C in 1983.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average May temperatures have risen by about 3°C. Daytime highs moved from 15.1°C to 18.7°C and overnight lows from 4.9°C to 7.2°C over the same span.
May is one of the warmer months of the year in Orillia and about average for rainfall, so plan for around 16.9°C daytime highs and 6°C at night.
Not quite — May is the 8th coolest month in Orillia, averaging 11.5°C.
For May in Orillia, pack warm layers and a jacket for chilly mornings, with typical highs of 16.9°C and lows of 6°C. Bring an umbrella or light rain jacket too.
Relative humidity in May averages 74% — moderately humid.
Average wind speed in May is 1.3 m/s. The windiest May on record averaged 1.5 m/s (1997).
The wettest May on record was 2002 with 147 mm. On average, May sees 55 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 Orillia 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.
