Ottawa Climate by Month
Ottawa, Ontario, Canada
Warm summers and bitterly cold winters, with rain spread through the year.
The climate in Ottawa is one of warm summers and bitterly cold winters, with rain spread through the year. Afternoon highs range from 22°F (-5°C) in January to 81°F (27°C) in July, and January nights average 6°F (-14°C). About 37 in (949 mm) of rain falls in a typical year, with no clear rainy season.
- Warmest month
- 81°F(27°C)
- Average high, July
- Coldest nights
- 6°F(-14°C)
- Average low, January
- Rain per year
- 37 in(949 mm)
- No clear rainy season
- Humidity
- 76%
- Sunniest: July
Best and worst months in Ottawa
Best for weatherThe most comfortable weather comes in June and September, with highs around 74°F (23°C) and about 3.4 in (87 mm) of rain a month.
Least pleasantJanuary is the least pleasant month: it's the coldest, with highs of only 22°F (-5°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)
Ottawa weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 22°F(-5°C) | 6°F(-14°C) | 2.4 in(62 mm) | 100% | 1.4 |
| FebFebruary | 26°F(-3°C) | 8°F(-14°C) | 2.2 in(57 mm) | 93% | 2.4 |
| MarMarch | 37°F(3°C) | 19°F(-7°C) | 2.5 in(63 mm) | 78% | 3.4 |
| AprApril | 52°F(11°C) | 33°F(1°C) | 3.1 in(78 mm) | 65% | 4.5 |
| MayMay | 67°F(19°C) | 46°F(8°C) | 3.4 in(87 mm) | 58% | 5.3 |
| JunJuneBest | 76°F(25°C) | 56°F(13°C) | 3.6 in(92 mm) | 64% | 5.7 |
| JulJuly | 81°F(27°C) | 60°F(16°C) | 3.8 in(96 mm) | 66% | 5.7 |
| AugAugust | 79°F(26°C) | 59°F(15°C) | 3.6 in(92 mm) | 70% | 5.0 |
| SepSeptemberBest | 72°F(22°C) | 51°F(11°C) | 3.2 in(82 mm) | 75% | 3.9 |
| OctOctober | 57°F(14°C) | 40°F(5°C) | 3.5 in(89 mm) | 78% | 2.3 |
| NovNovember | 43°F(6°C) | 29°F(-1°C) | 3.0 in(75 mm) | 69% | 1.4 |
| DecDecember | 29°F(-1°C) | 16°F(-9°C) | 3.0 in(76 mm) | 95% | 1.1 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
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