Temperature
Cold by day, freezing at night.
Ottawa is usually most comfortable in May and September. Typical daytime highs range from 24–80°F across the year. Rain varies by season.

Cold by day, freezing at night.
Some precipitation is expected this month.
Sunshine is limited, with cloud often dominating.
Humidity is rarely noticeable in the cool air.
In November, afternoons feel about 32° and nights feel near 25°.
Mostly cloudy skies this month.
Calm winds are typical in November.
November late afternoons are around 39°F, easing to about 36°F in early evening.
| Month | High°F | Low°F | Rainin | Wet days | Sunh | Humidity% |
|---|---|---|---|---|---|---|
| Jan | 24 | 8 | 2.8 | 11 | 5.3 | 77 |
| Feb | 28 | 10 | 2.4 | 10 | 6.7 | 73 |
| Mar | 38 | 21 | 2.9 | 10 | 8.0 | 68 |
| Apr | 54 | 35 | 3.7 | 11 | 8.8 | 63 |
| May | 68 | 47 | 3.6 | 12 | 10.2 | 65 |
| Jun | 76 | 56 | 4.1 | 12 | 11.3 | 71 |
| Jul | 80 | 61 | 3.9 | 12 | 12.1 | 74 |
| Aug | 78 | 59 | 3.7 | 11 | 11.0 | 77 |
| Sep | 71 | 52 | 3.5 | 10 | 8.9 | 79 |
| Oct | 56 | 41 | 3.8 | 12 | 6.5 | 78 |
| Nov | 42 | 30 | 3.1 | 11 | 4.9 | 79 |
| Dec | 30 | 18 | 3.4 | 12 | 4.4 | 81 |
Similar climates
Want a side-by-side climate view? Compare Ottawa with Chicago.
Typical monthly values are based on long-term climate records. Useful for planning, not a forecast. Check the weather before you travel.
Sunshine: source type is not yet identified at metric level.
Local microclimates can vary by beach, neighborhood, trail, or elevation.
Last updated: Jun 1, 2026
Data & methodology