May is one of the warmer months of the year in Sudbury, with average highs near 16.6°C and lows around 4.2°C (mean 10.4°C). It is about average for rainfall, averaging 71 mm of rainfall and 77% relative humidity across the period.
May is one of the warmer months of the year in Sudbury. Across 45 years of records, the warmest May in Sudbury was 1998 — when the month averaged 13.5°C — while the coldest was 1997 at 6.6°C. Typical May days reach 16.6°C with nights near 4.2°C. The long-term May temperature trend is broadly flat.
May is about average for rainfall in Sudbury, averaging 71 mm of rainfall. The wettest May on record was 1983 with 153 mm, while the driest was 2005 at 19 mm.
Relative humidity in Sudbury during May averages 77%. The most humid May was 2004 at 82%, and the least humid was 1999 at 70%.
May receives about 5.4 kWh/m²/day of solar energy in Sudbury. The sunniest May was 1998 at 6.2 kWh/m²/day, and the cloudiest was 1984 at 4.3.
Average wind speed in Sudbury during May is 0.7 m/s. The windiest Mays were 2013, 2015 and 2017, among others at 0.7 m/s, while the calmest were 2023, 2024 and 2025, among others at 0.6 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 10.5°C | 10.3°C | 9.7°C | 10.7°C | 10.7°C | +0.2°C |
| Avg High | 16.5°C | 16.7°C | 15.7°C | 17.0°C | 17.2°C | +0.7°C |
| Avg Low | 4.5°C | 4.0°C | 3.7°C | 4.5°C | 4.2°C | -0.3°C |
| Avg Rain | 77 mm | 65 mm | 84 mm | 68 mm | 53 mm | -25 mm |
May temperatures in Sudbury have risen by about 1.5°C between 1981–1985 and 2021–2025.
May has ranged from a record low of -5.5°C (2020) to a record high of 30°C (1986).
Rainfall in May is about average for rainfall, averaging 71 mm, with a wettest year of 153 mm.
A good time to visit Sudbury
May is a good time to visit Sudbury, with days averaging 16.6°C and nights around 4.2°C (mean 10.4°C, warmer than Sudbury'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 | 16.2°C | 10.0°C | 3.7°C | 23.8°C | -3.7°C | 62 mm | 78% | 0.6 m/s | 5.5 |
| 2024 | 18.5°C | 12.1°C | 5.8°C | 26.0°C | 1.2°C | 56 mm | 78% | 0.6 m/s | 5.9 |
| 2023 | 17.6°C | 10.8°C | 4.0°C | 27.8°C | -3.4°C | 67 mm | 73% | 0.6 m/s | 6 |
| 2022 | 18.4°C | 11.7°C | 5.1°C | 27.4°C | -1.8°C | 47 mm | 75% | 0.6 m/s | 5.6 |
| 2021 | 17.1°C | 10.5°C | 3.8°C | 27.7°C | -4.4°C | 40 mm | 71% | 0.6 m/s | 5.7 |
| 2020 | 15.1°C | 8.8°C | 2.6°C | 27.6°C | -5.5°C | 43 mm | 76% | 0.6 m/s | 5.6 |
| 2019 | 13.9°C | 8.1°C | 2.4°C | 19.9°C | -3.0°C | 95 mm | 81% | 0.6 m/s | 4.8 |
| 2018 | 18.8°C | 11.9°C | 5.0°C | 26.7°C | -4.2°C | 75 mm | 76% | 0.6 m/s | 6.1 |
| 2017 | 14.9°C | 9.4°C | 3.8°C | 23.2°C | -3.0°C | 92 mm | 80% | 0.7 m/s | 4.9 |
| 2016 | 17.3°C | 10.6°C | 4.0°C | 25.8°C | -3.8°C | 40 mm | 77% | 0.6 m/s | 6 |
| 2015 | 16.9°C | 11.0°C | 5.1°C | 22.7°C | -2.3°C | 109 mm | 79% | 0.7 m/s | 5.1 |
| 2014 | 15.8°C | 10.1°C | 4.5°C | 23.5°C | -2.1°C | 83 mm | 82% | 0.6 m/s | 5 |
| 2013 | 17.5°C | 10.9°C | 4.4°C | 24.8°C | -2.8°C | 75 mm | 75% | 0.7 m/s | 5.9 |
| 2012 | 18.9°C | 11.9°C | 5.0°C | 25.0°C | -0.3°C | 26 mm | 72% | 0.6 m/s | 6 |
| 2011 | 16.4°C | 10.4°C | 4.3°C | 25.6°C | -1.0°C | 48 mm | 78% | 0.7 m/s | 5 |
| 2010 | 19.5°C | 13.0°C | 6.5°C | 29.9°C | -2.8°C | 34 mm | 73% | 0.6 m/s | 5.8 |
| 2009 | 14.6°C | 8.4°C | 2.1°C | 20.7°C | -3.8°C | 109 mm | 78% | 0.7 m/s | 5.7 |
| 2008 | 14.3°C | 8.3°C | 2.3°C | 21.7°C | -2.5°C | 93 mm | 79% | 0.7 m/s | 5.2 |
| 2007 | 18.0°C | 11.2°C | 4.3°C | 26.8°C | -1.6°C | 43 mm | 73% | 0.7 m/s | 6.1 |
| 2006 | 17.8°C | 12.2°C | 6.6°C | 28.1°C | -2.3°C | 93 mm | 80% | 0.6 m/s | 5.1 |
| 2005 | 16.3°C | 10.1°C | 3.8°C | 24.5°C | -5.0°C | 19 mm | 71% | 0.6 m/s | 5.8 |
| 2004 | 14.5°C | 8.7°C | 3.0°C | 21.6°C | -3.8°C | 106 mm | 82% | 0.7 m/s | 4.8 |
| 2003 | 15.6°C | 10.0°C | 4.4°C | 21.3°C | -2.8°C | 92 mm | 80% | 0.6 m/s | 5 |
| 2002 | 12.8°C | 7.0°C | 1.1°C | 21.8°C | -3.0°C | 88 mm | 79% | 0.7 m/s | 5.1 |
| 2001 | 16.9°C | 11.2°C | 5.5°C | 22.8°C | -0.4°C | 125 mm | 81% | 0.6 m/s | 5.3 |
| 2000 | 16.2°C | 10.1°C | 3.9°C | 23.5°C | -4.0°C | 72 mm | 78% | 0.7 m/s | 5.4 |
| 1999 | 19.6°C | 12.7°C | 5.9°C | 28.1°C | -0.7°C | 66 mm | 70% | 0.7 m/s | 6 |
| 1998 🔥 | 20.3°C | 13.5°C | 6.7°C | 25.8°C | 2.3°C | 57 mm | 73% | 0.7 m/s | 6.2 |
| 1997 ❄️ | 11.9°C | 6.6°C | 1.2°C | 22.1°C | -3.3°C | 62 mm | 79% | 0.7 m/s | 5 |
| 1996 | 14.7°C | 8.4°C | 2.1°C | 23.1°C | -4.1°C | 29 mm | 73% | 0.6 m/s | 6 |
| 1995 | 16.6°C | 10.3°C | 4.0°C | 26.0°C | -3.2°C | 84 mm | 76% | 0.6 m/s | 5 |
| 1994 | 16.4°C | 9.7°C | 3.1°C | 26.2°C | -3.8°C | 73 mm | 72% | 0.7 m/s | 5.8 |
| 1993 | 16.3°C | 10.3°C | 4.4°C | 28.0°C | -2.4°C | 91 mm | 76% | 0.6 m/s | 4.5 |
| 1992 | 16.7°C | 9.6°C | 2.6°C | 25.3°C | -3.5°C | 39 mm | 71% | 0.7 m/s | 6.1 |
| 1991 | 19.2°C | 12.8°C | 6.4°C | 27.6°C | -5.1°C | 63 mm | 76% | 0.7 m/s | 5.7 |
| 1990 | 15.4°C | 9.3°C | 3.2°C | 23.0°C | -3.5°C | 91 mm | 73% | 0.7 m/s | 4.9 |
| 1989 | 17.0°C | 11.2°C | 5.4°C | 25.4°C | -1.3°C | 62 mm | 79% | 0.7 m/s | 5 |
| 1988 | 18.4°C | 11.8°C | 5.2°C | 28.2°C | -3.1°C | 77 mm | 76% | 0.7 m/s | 5.8 |
| 1987 | 18.0°C | 11.4°C | 4.8°C | 27.1°C | -5.0°C | 65 mm | 72% | 0.7 m/s | 5.4 |
| 1986 | 18.3°C | 12.5°C | 6.7°C | 30.0°C | -4.1°C | 81 mm | 77% | 0.7 m/s | 4.9 |
| 1985 | 16.1°C | 10.3°C | 4.5°C | 22.2°C | -3.9°C | 65 mm | 80% | 0.6 m/s | 5.5 |
| 1984 | 13.5°C | 7.8°C | 2.2°C | 18.7°C | -4.0°C | 98 mm | 78% | 0.7 m/s | 4.3 |
| 1983 🌧️ | 13.1°C | 7.3°C | 1.5°C | 21.1°C | -5.4°C | 153 mm | 80% | 0.7 m/s | — |
| 1982 | 18.5°C | 12.7°C | 6.9°C | 23.7°C | -0.1°C | 40 mm | 80% | 0.6 m/s | — |
| 1981 | 15.5°C | 9.3°C | 3.1°C | 24.4°C | -5.0°C | 55 mm | 77% | 0.7 m/s | — |
Actual recorded May data for each year, 1981–2025 — sourced from NASA POWER.
The average high in May is around 16.6°C with lows near 4.2°C (mean 10.4°C), based on 45 years of NASA POWER data.
May averages 71 mm of rainfall in Sudbury, about average for rainfall. The wettest on record was 153 mm in 1983.
The hottest May reached 30°C in 1986. The coldest dipped to -5.5°C in 2020.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average May temperatures have risen by about 1.5°C. Daytime highs moved from 15.3°C to 17.6°C and overnight lows from 3.6°C to 4.5°C over the same span.
May is one of the warmer months of the year in Sudbury and about average for rainfall, so plan for around 16.6°C daytime highs and 4.2°C at night.
Not quite — May is the 8th coolest month in Sudbury, averaging 10.4°C.
For May in Sudbury, pack warm layers and a jacket for chilly mornings, with typical highs of 16.6°C and lows of 4.2°C. Bring an umbrella or light rain jacket too.
Relative humidity in May averages 77% — quite humid.
Average wind speed in May is 0.7 m/s. The windiest May on record averaged 0.7 m/s (1981).
The wettest May on record was 1983 with 153 mm. On average, May sees 71 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 Sudbury 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.
