April is one of the cooler months of the year in Sudbury, with average highs near 8.6°C and lows around -2.5°C (mean 3.1°C). It is about average for rainfall, averaging 65 mm of rainfall and 80% relative humidity across the period.
April is one of the cooler months of the year in Sudbury. Across 45 years of records, the warmest April in Sudbury was 1987 — when the month averaged 6.9°C — while the coldest was 2018 at -1.4°C. Typical April days reach 8.6°C with nights near -2.5°C. The long-term trend is cooling, about 0.2°C per decade.
April is about average for rainfall in Sudbury, averaging 65 mm of rainfall. The wettest April on record was 2024 with 131 mm, while the driest was 1986 at 24 mm.
Relative humidity in Sudbury during April averages 80%. The most humid April was 1985 at 94%, and the least humid was 1998 at 73%.
April receives about 4.6 kWh/m²/day of solar energy in Sudbury. The sunniest April was 1998 at 5.4 kWh/m²/day, and the cloudiest was 2024 at 3.8.
Average wind speed in Sudbury during April is 1 m/s. The windiest Aprils were 2013, 2018 and 2024, among others at 1.1 m/s, while the calmest were 2016, 2021 and 2022, among others at 0.9 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 3.3°C | 3.2°C | 3.3°C | 2.2°C | 3.5°C | +0.2°C |
| Avg High | 9.0°C | 8.8°C | 8.8°C | 7.6°C | 9.1°C | +0.1°C |
| Avg Low | -2.3°C | -2.4°C | -2.3°C | -3.3°C | -2.1°C | +0.2°C |
| Avg Rain | 66 mm | 51 mm | 62 mm | 75 mm | 76 mm | +10 mm |
April temperatures in Sudbury have risen by about 1.4°C between 1981–1985 and 2021–2025.
April has ranged from a record low of -19.3°C (1985) to a record high of 26°C (1990).
Rainfall in April is about average for rainfall, averaging 65 mm, with a wettest year of 131 mm.
A good time to visit Sudbury
April is a good time to visit Sudbury, with days averaging 8.6°C and nights around -2.5°C (mean 3.1°C, close to Sudbury's yearly average) and moderate rainfall. July and August are marginally more temperate, but April still suits most travellers.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 8.2°C | 2.2°C | -3.9°C | 20.4°C | -18.3°C | 73 mm | 79% | 1 m/s | 4.5 |
| 2024 🌧️ | 10.0°C | 4.4°C | -1.2°C | 17.1°C | -8.2°C | 131 mm | 79% | 1.1 m/s | 3.8 |
| 2023 | 10.0°C | 4.2°C | -1.6°C | 26.0°C | -12.5°C | 95 mm | 81% | 1 m/s | 3.9 |
| 2022 | 7.9°C | 2.8°C | -2.4°C | 15.3°C | -7.2°C | 59 mm | 77% | 0.9 m/s | 4.1 |
| 2021 | 11.0°C | 5.4°C | -0.1°C | 22.7°C | -8.2°C | 48 mm | 77% | 0.9 m/s | 4.3 |
| 2020 | 7.4°C | 2.1°C | -3.2°C | 13.7°C | -10.6°C | 48 mm | 77% | 1 m/s | 4.8 |
| 2019 | 7.0°C | 1.9°C | -3.1°C | 17.8°C | -13.9°C | 84 mm | 83% | 1 m/s | 4 |
| 2018 ❄️ | 4.0°C | -1.4°C | -6.7°C | 17.1°C | -16.8°C | 67 mm | 83% | 1.1 m/s | 4.5 |
| 2017 | 9.7°C | 4.2°C | -1.4°C | 20.6°C | -4.7°C | 108 mm | 82% | 1 m/s | 4.1 |
| 2016 | 5.5°C | -0.2°C | -6.0°C | 19.7°C | -16.6°C | 43 mm | 80% | 0.9 m/s | 5.1 |
| 2015 | 8.0°C | 2.6°C | -2.8°C | 17.9°C | -14.9°C | 68 mm | 83% | 1 m/s | 4.9 |
| 2014 | 5.3°C | 0.7°C | -3.9°C | 11.6°C | -12.0°C | 88 mm | 85% | 1 m/s | 4.3 |
| 2013 | 6.4°C | 1.3°C | -3.8°C | 20.0°C | -11.9°C | 92 mm | 81% | 1.1 m/s | 3.9 |
| 2012 | 9.4°C | 3.4°C | -2.5°C | 16.9°C | -5.8°C | 47 mm | 74% | 1 m/s | 5 |
| 2011 | 8.3°C | 2.9°C | -2.5°C | 17.4°C | -6.0°C | 101 mm | 76% | 1 m/s | 4.5 |
| 2010 | 12.5°C | 6.2°C | -0.2°C | 19.9°C | -7.1°C | 47 mm | 74% | 1 m/s | 5 |
| 2009 | 7.8°C | 2.4°C | -2.9°C | 21.2°C | -10.0°C | 97 mm | 84% | 1 m/s | 4.6 |
| 2008 | 10.4°C | 4.7°C | -0.9°C | 22.5°C | -17.6°C | 71 mm | 82% | 1 m/s | 4.8 |
| 2007 | 8.1°C | 3.0°C | -2.1°C | 20.1°C | -14.0°C | 63 mm | 81% | 1 m/s | 4.2 |
| 2006 | 11.5°C | 5.3°C | -0.8°C | 20.4°C | -7.4°C | 64 mm | 79% | 0.9 m/s | 5 |
| 2005 | 11.3°C | 5.0°C | -1.2°C | 23.0°C | -5.0°C | 56 mm | 75% | 1.1 m/s | 5 |
| 2004 | 8.5°C | 2.9°C | -2.7°C | 19.8°C | -11.6°C | 54 mm | 80% | 1 m/s | 4.4 |
| 2003 | 6.7°C | 0.9°C | -5.0°C | 17.3°C | -18.0°C | 53 mm | 77% | 1 m/s | 4.4 |
| 2002 | 6.4°C | 1.5°C | -3.4°C | 21.7°C | -15.8°C | 61 mm | 85% | 0.9 m/s | 4.4 |
| 2001 | 8.6°C | 3.5°C | -1.5°C | 18.1°C | -4.8°C | 75 mm | 84% | 1 m/s | 4.4 |
| 2000 | 8.9°C | 3.3°C | -2.4°C | 18.7°C | -7.8°C | 25 mm | 75% | 1 m/s | 5 |
| 1999 | 11.2°C | 4.9°C | -1.5°C | 20.2°C | -5.6°C | 25 mm | 74% | 1 m/s | 5.1 |
| 1998 | 11.8°C | 5.3°C | -1.2°C | 20.8°C | -6.4°C | 35 mm | 73% | 1 m/s | 5.4 |
| 1997 | 7.6°C | 2.0°C | -3.5°C | 15.6°C | -14.0°C | 40 mm | 80% | 0.9 m/s | 5.1 |
| 1996 | 4.8°C | 0.1°C | -4.5°C | 15.6°C | -12.0°C | 81 mm | 82% | 1.1 m/s | 4.2 |
| 1995 | 6.4°C | 1.1°C | -4.1°C | 12.6°C | -14.9°C | 89 mm | 76% | 1 m/s | 4.1 |
| 1994 | 9.2°C | 3.4°C | -2.3°C | 22.3°C | -9.4°C | 38 mm | 76% | 1.1 m/s | 4.7 |
| 1993 | 8.7°C | 3.3°C | -2.0°C | 15.0°C | -6.7°C | 78 mm | 77% | 1.1 m/s | 4.2 |
| 1992 | 7.2°C | 1.9°C | -3.3°C | 15.3°C | -11.3°C | 43 mm | 82% | 0.9 m/s | 5.2 |
| 1991 | 10.5°C | 5.0°C | -0.6°C | 19.9°C | -9.6°C | 58 mm | 83% | 1.1 m/s | 4.4 |
| 1990 | 10.2°C | 4.7°C | -0.8°C | 26.0°C | -7.8°C | 28 mm | 78% | 1.1 m/s | 4.4 |
| 1989 | 7.3°C | 1.9°C | -3.5°C | 15.2°C | -8.7°C | 51 mm | 80% | 0.9 m/s | 4.6 |
| 1988 | 9.5°C | 3.9°C | -1.8°C | 17.7°C | -5.9°C | 75 mm | 81% | 0.9 m/s | 4.2 |
| 1987 🔥 | 13.1°C | 6.9°C | 0.7°C | 24.4°C | -8.6°C | 41 mm | 75% | 1 m/s | 4.7 |
| 1986 | 11.5°C | 5.4°C | -0.6°C | 24.1°C | -7.9°C | 24 mm | 80% | 1.1 m/s | 4.7 |
| 1985 | 4.9°C | 0.3°C | -4.4°C | 21.0°C | -19.3°C | 105 mm | 94% | 0.9 m/s | 5 |
| 1984 | 11.5°C | 5.5°C | -0.5°C | 20.7°C | -7.3°C | 59 mm | 81% | 1.1 m/s | 4.7 |
| 1983 | 7.5°C | 2.5°C | -2.5°C | 18.9°C | -7.9°C | 66 mm | 82% | 1 m/s | — |
| 1982 | 5.6°C | -0.3°C | -6.2°C | 18.9°C | -19.2°C | 66 mm | 84% | 1.1 m/s | — |
| 1981 | 9.7°C | 4.0°C | -1.7°C | 15.2°C | -7.8°C | 108 mm | 78% | 1.1 m/s | — |
Actual recorded April data for each year, 1981–2025 — sourced from NASA POWER.
The average high in April is around 8.6°C with lows near -2.5°C (mean 3.1°C), based on 45 years of NASA POWER data.
April averages 65 mm of rainfall in Sudbury, about average for rainfall. The wettest on record was 131 mm in 2024.
The hottest April reached 26°C in 1990. The coldest dipped to -19.3°C in 1985.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average April temperatures have risen by about 1.4°C. Daytime highs moved from 7.8°C to 9.4°C and overnight lows from -3.1°C to -1.8°C over the same span.
April is one of the cooler months of the year in Sudbury and about average for rainfall, so plan for around 8.6°C daytime highs and -2.5°C at night.
Not quite — April is the 6th coolest month in Sudbury, averaging 3.1°C.
For April in Sudbury, pack warm layers and a jacket for chilly mornings, with typical highs of 8.6°C and lows of -2.5°C. Bring an umbrella or light rain jacket too.
Relative humidity in April averages 80% — quite humid.
Average wind speed in April is 1 m/s. The windiest April on record averaged 1.1 m/s (1981).
The wettest April on record was 2024 with 131 mm. On average, April 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 Sudbury behaves each April, 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 April specifically, along with year-by-year records and how the month has changed over the decades.
