March is one of the cooler months of the year in Oshawa, with average highs near 3.4°C and lows around -4.9°C (mean -0.8°C). It is one of the drier months, averaging 43 mm of rainfall and 82% relative humidity across the period.
March is one of the cooler months of the year in Oshawa. Across 45 years of records, the warmest March in Oshawa was 2012 — when the month averaged 4.7°C — while the coldest was 2014 at -5.4°C. Typical March days reach 3.4°C with nights near -4.9°C. The long-term trend is warming, about 0.3°C per decade.
March is one of the drier months in Oshawa, averaging 43 mm of rainfall. The wettest March on record was 2002 with 92 mm, while the driest was 1981 at 12 mm.
Relative humidity in Oshawa during March averages 82%. The most humid March was 2003 at 88%, and the least humid was 2021 at 74%.
March receives about 3.4 kWh/m²/day of solar energy in Oshawa. The sunniest Marchs were 1999, 2009 and 2021 at 4 kWh/m²/day, and the cloudiest was 2004 at 2.7.
Average wind speed in Oshawa during March is 4.2 m/s. The windiest Marchs were 1985 and 2017 at 4.9 m/s, while the calmest were 1987, 2003 and 2016 at 3.6 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | -1.2°C | -1.1°C | -1.0°C | -0.7°C | 1.1°C | +2.3°C |
| Avg High | 3.1°C | 3.2°C | 2.9°C | 3.3°C | 5.4°C | +2.3°C |
| Avg Low | -5.5°C | -5.3°C | -4.9°C | -4.8°C | -3.2°C | +2.3°C |
| Avg Rain | 33 mm | 36 mm | 60 mm | 44 mm | 42 mm | +8 mm |
March temperatures in Oshawa have risen by about 2.6°C between 1981–1985 and 2021–2025.
March has ranged from a record low of -28.2°C (2003) to a record high of 23.6°C (2012).
Rainfall in March is one of the drier months, averaging 43 mm, with a wettest year of 92 mm.
A quieter season to visit Oshawa
If your dates are flexible, the more temperate months of July and August tend to be the most comfortable for visiting Oshawa. That said, March — with days averaging 3.4°C and nights around -4.9°C (mean -0.8°C) and moderate rainfall (43 mm) — can still be rewarding for travellers who don't mind the cooler conditions, and often means fewer crowds.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 5.5°C | 0.9°C | -3.6°C | 15.8°C | -17.5°C | 51 mm | 80% | 4.6 m/s | 3.2 |
| 2024 | 6.5°C | 2.4°C | -1.7°C | 14.9°C | -8.0°C | 40 mm | 79% | 4.3 m/s | 3.5 |
| 2023 | 3.8°C | 0.2°C | -3.5°C | 8.6°C | -8.5°C | 54 mm | 80% | 4.5 m/s | 2.9 |
| 2022 | 3.8°C | -0.2°C | -4.2°C | 15.2°C | -12.5°C | 43 mm | 82% | 4.4 m/s | 3.1 |
| 2021 | 6.6°C | 1.4°C | -3.8°C | 15.8°C | -14.1°C | 34 mm | 74% | 4.5 m/s | 4 |
| 2020 | 6.1°C | 1.8°C | -2.4°C | 17.7°C | -11.8°C | 29 mm | 82% | 4.2 m/s | 3.2 |
| 2019 | 1.9°C | -1.8°C | -5.6°C | 9.4°C | -14.6°C | 43 mm | 81% | 4.2 m/s | 3.3 |
| 2018 | 2.5°C | -1.1°C | -4.8°C | 8.7°C | -10.3°C | 32 mm | 79% | 4.3 m/s | 3.6 |
| 2017 | 1.9°C | -2.0°C | -5.8°C | 13.5°C | -14.9°C | 60 mm | 79% | 4.9 m/s | 3.3 |
| 2016 | 4.5°C | 0.8°C | -2.9°C | 15.2°C | -13.7°C | 63 mm | 84% | 3.6 m/s | 3.1 |
| 2015 | 0.6°C | -3.6°C | -7.9°C | 6.1°C | -21.9°C | 26 mm | 80% | 4.1 m/s | 3.5 |
| 2014 ❄️ | -0.7°C | -5.4°C | -10.2°C | 11.7°C | -21.0°C | 35 mm | 82% | 4.3 m/s | 3.3 |
| 2013 | 2.9°C | -0.8°C | -4.5°C | 11.2°C | -10.6°C | 20 mm | 81% | 4.2 m/s | 3.4 |
| 2012 🔥 | 9.3°C | 4.7°C | 0.1°C | 23.6°C | -13.7°C | 31 mm | 81% | 4 m/s | 3.6 |
| 2011 | 2.4°C | -1.3°C | -5.1°C | 11.2°C | -12.2°C | 76 mm | 81% | 4.3 m/s | 3.4 |
| 2010 | 7.6°C | 3.0°C | -1.5°C | 14.5°C | -7.5°C | 50 mm | 79% | 3.9 m/s | 3.5 |
| 2009 | 3.7°C | -0.4°C | -4.6°C | 12.7°C | -17.6°C | 92 mm | 82% | 3.8 m/s | 4 |
| 2008 | 0.8°C | -2.7°C | -6.2°C | 8.3°C | -13.4°C | 87 mm | 84% | 4.4 m/s | 3.2 |
| 2007 | 2.8°C | -1.3°C | -5.3°C | 16.8°C | -22.7°C | 47 mm | 84% | 4.5 m/s | 3.1 |
| 2006 | 3.6°C | -0.7°C | -4.9°C | 17.3°C | -13.9°C | 43 mm | 82% | 4.2 m/s | 3.8 |
| 2005 | 1.7°C | -2.0°C | -5.6°C | 13.7°C | -14.2°C | 26 mm | 84% | 3.8 m/s | 3.5 |
| 2004 | 4.2°C | 0.8°C | -2.7°C | 14.6°C | -13.3°C | 64 mm | 86% | 4.1 m/s | 2.7 |
| 2003 | 1.8°C | -3.0°C | -7.8°C | 14.0°C | -28.2°C | 65 mm | 88% | 3.6 m/s | 3.2 |
| 2002 🌧️ | 2.4°C | -1.6°C | -5.5°C | 11.9°C | -15.3°C | 92 mm | 83% | 4.6 m/s | 3.2 |
| 2001 | 1.6°C | -1.9°C | -5.3°C | 8.5°C | -13.0°C | 50 mm | 85% | 3.9 m/s | 2.8 |
| 2000 | 6.6°C | 2.5°C | -1.6°C | 17.3°C | -6.5°C | 31 mm | 81% | 4.2 m/s | 3.2 |
| 1999 | 2.9°C | -1.6°C | -6.2°C | 16.3°C | -19.1°C | 39 mm | 81% | 4.4 m/s | 4 |
| 1998 | 4.3°C | 0.7°C | -2.8°C | 19.7°C | -14.3°C | 54 mm | 84% | 4.4 m/s | 3.2 |
| 1997 | 1.9°C | -2.2°C | -6.2°C | 15.1°C | -12.9°C | 49 mm | 83% | 4.6 m/s | 3.1 |
| 1996 | 1.4°C | -2.7°C | -6.7°C | 11.7°C | -15.0°C | 16 mm | 75% | 4.2 m/s | 3.6 |
| 1995 | 5.6°C | 0.7°C | -4.3°C | 18.4°C | -16.2°C | 38 mm | 80% | 3.7 m/s | 3.4 |
| 1994 | 3.0°C | -1.1°C | -5.1°C | 13.8°C | -12.1°C | 25 mm | 82% | 3.9 m/s | 3.6 |
| 1993 | 2.3°C | -1.8°C | -6.0°C | 16.8°C | -18.2°C | 22 mm | 85% | 3.9 m/s | 3.1 |
| 1992 | 1.6°C | -2.6°C | -6.9°C | 9.2°C | -15.8°C | 38 mm | 79% | 4.3 m/s | 3.5 |
| 1991 | 4.4°C | 0.0°C | -4.4°C | 13.0°C | -13.8°C | 55 mm | 83% | 4.4 m/s | 3.3 |
| 1990 | 4.4°C | 0.1°C | -4.1°C | 18.4°C | -15.6°C | 19 mm | 79% | 3.9 m/s | 3.3 |
| 1989 | 2.1°C | -2.3°C | -6.7°C | 18.3°C | -21.1°C | 30 mm | 79% | 4.2 m/s | 3 |
| 1988 | 3.3°C | -1.2°C | -5.7°C | 13.8°C | -16.6°C | 21 mm | 76% | 4.3 m/s | 3.6 |
| 1987 | 6.1°C | 1.2°C | -3.6°C | 13.6°C | -16.2°C | 25 mm | 79% | 3.6 m/s | 3.6 |
| 1986 | 4.3°C | -0.2°C | -4.8°C | 18.1°C | -19.6°C | 25 mm | 84% | 4.6 m/s | 3.3 |
| 1985 | 3.3°C | -1.2°C | -5.7°C | 13.4°C | -13.5°C | 50 mm | 81% | 4.9 m/s | 3.2 |
| 1984 | -0.8°C | -4.9°C | -9.0°C | 8.2°C | -20.2°C | 36 mm | 85% | 4.6 m/s | 3.3 |
| 1983 | 4.0°C | 0.2°C | -3.5°C | 10.1°C | -14.0°C | 54 mm | 84% | 4.4 m/s | — |
| 1982 | 1.7°C | -2.5°C | -6.7°C | 14.5°C | -20.9°C | 46 mm | 87% | 4.6 m/s | — |
| 1981 | 4.0°C | 0.0°C | -4.0°C | 18.4°C | -11.5°C | 12 mm | 79% | 4.2 m/s | — |
Actual recorded March data for each year, 1981–2025 — sourced from NASA POWER.
The average high in March is around 3.4°C with lows near -4.9°C (mean -0.8°C), based on 45 years of NASA POWER data.
March averages 43 mm of rainfall in Oshawa, one of the drier months. The wettest on record was 92 mm in 2002.
The hottest March reached 23.6°C in 2012. The coldest dipped to -28.2°C in 2003.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average March temperatures have risen by about 2.6°C. Daytime highs moved from 2.4°C to 5.2°C and overnight lows from -5.8°C to -3.4°C over the same span.
March is one of the cooler months of the year in Oshawa and one of the drier months, so plan for around 3.4°C daytime highs and -4.9°C at night.
Not quite — March is the 4th coolest month in Oshawa, averaging -0.8°C.
For March in Oshawa, pack warm layers and a jacket for chilly mornings, with typical highs of 3.4°C and lows of -4.9°C.
Relative humidity in March averages 82% — quite humid.
Average wind speed in March is 4.2 m/s. The windiest March on record averaged 4.9 m/s (1985).
The wettest March on record was 2002 with 92 mm. On average, March sees 43 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 Oshawa behaves each March, 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 March specifically, along with year-by-year records and how the month has changed over the decades.
