Oshawa Climate by Month
Oshawa, Ontario, Canada
Warm summers and freezing winters, with rain spread through the year.
Warm summers and freezing winters, with rain spread through the year: that's Oshawa's climate in short. Expect highs of 79°F (26°C) in July and 30°F (-1°C) in January, with the coldest nights (January) near 16°F (-9°C). About 35 in (879 mm) of rain falls in a typical year, with no clear rainy season.
- Warmest month
- 79°F(26°C)
- Average high, July
- Coldest nights
- 16°F(-9°C)
- Average low, January
- Rain per year
- 35 in(879 mm)
- No clear rainy season
- Humidity
- 78%
- Sunniest: June
Best and worst months in Oshawa
Best for weatherThe most comfortable weather comes from June to August, with highs around 77°F (25°C) and about 3.1 in (79 mm) of rain a month.
Least pleasantJanuary is the least pleasant month: it's the coldest, with highs of only 30°F (-1°C).
Comfort combines how close the afternoon high is to 75°F (24°C) with how much rain falls and how humid it is. See where the weather is best in June.
Temperature and rain through the year
Highs and lows (°F)
Average highAverage low
Rain (in per month)
Oshawa weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 30°F(-1°C) | 16°F(-9°C) | 2.6 in(65 mm) | 95% | 1.4 |
| FebFebruary | 32°F(0°C) | 18°F(-8°C) | 2.3 in(59 mm) | 88% | 2.2 |
| MarMarch | 40°F(5°C) | 26°F(-3°C) | 2.0 in(51 mm) | 62% | 3.4 |
| AprApril | 52°F(11°C) | 36°F(2°C) | 3.2 in(82 mm) | 61% | 4.3 |
| MayMay | 65°F(18°C) | 47°F(8°C) | 3.3 in(84 mm) | 66% | 5.4 |
| JunJuneBest | 74°F(24°C) | 56°F(13°C) | 3.3 in(84 mm) | 75% | 5.9 |
| JulJulyBest | 79°F(26°C) | 61°F(16°C) | 2.9 in(74 mm) | 72% | 5.8 |
| AugAugustBest | 78°F(26°C) | 60°F(16°C) | 3.1 in(79 mm) | 75% | 5.2 |
| SepSeptember | 71°F(22°C) | 53°F(12°C) | 3.2 in(82 mm) | 79% | 4.0 |
| OctOctober | 58°F(14°C) | 42°F(6°C) | 3.0 in(76 mm) | 82% | 2.3 |
| NovNovember | 46°F(8°C) | 33°F(0°C) | 3.1 in(78 mm) | 87% | 1.4 |
| DecDecember | 35°F(2°C) | 23°F(-5°C) | 2.6 in(65 mm) | 91% | 1.1 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
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