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Ottawa Weather and climate
Data source：Meteostat
Update date：2025-09
Ottawa year round climate
- Spring (March–May): Average -0.1–14.8°C, the climate gradually warms, but early spring can still be chilly, with occasional rainfall. Snow is possible in March. April brings warmer weather and blooming flowers, while May offers pleasant temperatures. Common activities: flower viewing, outdoor walks, cycling. Suggested clothing: layers, including warm base layers, a light jacket, and comfortable shoes.
- Summer (June–August): Average 18.8–21.7°C, warm and humid climate with frequent rainfall, especially in August. Common activities: boating, picnics, hiking. Suggested clothing: light and breathable clothing, rain gear.
- Autumn (September–November): Average 16.3–2.9°C, temperatures gradually decrease, the weather is dry and comfortable, with occasional rainfall. The vibrant fall foliage is a highlight of autumn. Common activities: leaf peeping, outdoor activities such as hiking. Suggested clothing: warm jacket, comfortable long pants and shoes.
- Winter (December–February): Average -8.5–-2.7°C, cold climate with frequent snow and ice, low temperatures require adequate warmth. Common activities: skiing, ice skating, indoor activities. Suggested clothing: heavy warm clothing, including a down jacket, warm hat, gloves and scarf, waterproof and snow-proof shoes.
Ottawa climatological average
Annual average temperature: approx. 8°C / Annual rainfall: approx. 956 mm / Summer humidity: 65%–75% / Rainiest month: August
Ottawa monthly average temperature and precipitation
Month
Air temperature (°C)
Precipitation (mm)
January
-8.5°C
59.7
February
-6.7°C
44.1
March
-0.1°C
54.8
April
7°C
100.9
May
14.8°C
76.9
June
18.8°C
112.6
July
21.7°C
109.5
August
19.8°C
142.5
September
16.3°C
54.1
October
10.1°C
57.5
November
2.9°C
51.2
December
-2.7°C
92.4
Ottawa weather for the next seven days
10/10
Friday
Sunny
14°C/-0.7°C
10/11
Saturday
Partly Cloudy
19.9°C/6.1°C
10/12
Sunday
Overcast
14.4°C/7.1°C
10/13
Monday
Overcast
12°C/8°C
10/14
Tuesday
Partly Cloudy
17.3°C/8.3°C
10/15
Wednesday
Partly Cloudy
15.3°C/6.7°C
10/16
Thursday
Overcast
11.3°C/6.2°C
