Ottawa Weather
Ottawa weather today, the 14-day forecast, and average temperature, rain and what to wear for every month — compared against Hong Kong. Best months to visit: May, Jun, Jul, Aug, Sep and Oct.
Ottawa current weather
Ottawa now (local time 06:30)
4°C
Fog
- Feels like
- 1°
- Humidity
- 97%
- Wind
- 5 km/h
Next 7 days · what to wear
1° – 20°C
Rain likely on 1 of 7 days
👕 A sweater plus a coat or windbreaker; big day–night swing, so dress in layers.
Ottawa 14-day forecast
Today
10/4
🌫️
16°
3°
💧29%
Mon
10/5
☁️
12°
3°
💧13%
Tue
10/6
☁️
11°
1°
💧1%
Wed
10/7
🌦️
20°
6°
💧64%
Thu
10/8
🌦️
17°
9°
💧24%
Fri
10/9
☁️
14°
6°
💧24%
Sat
10/10
⛅
13°
3°
💧14%
Sun
10/11
☁️
22°
5°
💧4%
Mon
10/12
☁️
17°
9°
💧27%
Tue
10/13
🌦️
15°
8°
💧30%
Wed
10/14
🌧️
16°
11°
💧24%
Thu
10/15
🌦️
15°
8°
💧22%
Fri
10/16
🌦️
10°
4°
💧26%
Sat
10/17
☁️
7°
1°
💧27%
Best time to visit Ottawa
On temperature and rainfall, the most comfortable months in Ottawa are May, Jun, Jul, Aug, Sep and Oct. The hottest month is July (average high 26°C) and the coldest is January (average low -16°C).
Ottawa climate by month
| Month | Avg high | Avg low | Rain | Humidity | vs Hong Kong |
|---|---|---|---|---|---|
| Jan | -6°C | -16°C | 61 mm | 95% | -28°C |
| Feb | -4°C | -15°C | 55 mm | 94% | -27°C |
| Mar | 2°C | -8°C | 64 mm | 87% | -23°C |
| Apr | 11°C | 0°C | 85 mm | 78% | -18°C |
| MayBest | 19°C | 7°C | 85 mm | 77% | -14°C |
| JunBest | 24°C | 13°C | 104 mm | 79% | -10°C |
| JulBest | 26°C | 16°C | 98 mm | 79% | -8°C |
| AugBest | 25°C | 15°C | 88 mm | 78% | -9°C |
| SepBest | 22°C | 10°C | 87 mm | 78% | -12°C |
| OctBest | 13°C | 4°C | 99 mm | 81% | -18°C |
| Nov | 5°C | -3°C | 73 mm | 85% | -21°C |
| Dec | -2°C | -11°C | 80 mm | 92% | -25°C |
Data: NASA POWER 2001–2020 climatology (MERRA-2, elevation-corrected); Hong Kong comparison uses HKO 1991–2020 normals.
Ottawa weather month by month: what to wear
Ottawa in OctoberBest monthThis month
October in Ottawa is chilly: average highs of 13°C and lows of 4°C, around 99 mm of rain (some rain) and 81% humidity — about 18°C colder than Hong Kong. It's one of the most comfortable months of the year to visit.
👕 A sweater plus a coat or windbreaker; big day–night swing, so dress in layers.
Ottawa in November
November in Ottawa is cold: average highs of 5°C and lows of -3°C, around 73 mm of rain (mostly dry) and 85% humidity — about 21°C colder than Hong Kong.
👕 A warm coat over a sweater, plus a scarf.
Ottawa in December
December in Ottawa is freezing: average highs of -2°C and lows of -11°C, around 80 mm of rain (some rain) and 92% humidity — about 25°C colder than Hong Kong.
👕 A heavy down jacket, thermals, gloves, a hat and non-slip shoes; snow is possible.
Ottawa in January
January in Ottawa is freezing: average highs of -6°C and lows of -16°C, around 61 mm of rain (mostly dry) and 95% humidity — about 28°C colder than Hong Kong.
👕 A heavy down jacket, thermals, gloves, a hat and non-slip shoes; big day–night swing, so dress in layers; snow is possible.
Ottawa in February
February in Ottawa is freezing: average highs of -4°C and lows of -15°C, around 55 mm of rain (mostly dry) and 94% humidity — about 27°C colder than Hong Kong.
👕 A heavy down jacket, thermals, gloves, a hat and non-slip shoes; big day–night swing, so dress in layers; snow is possible.
Ottawa in March
March in Ottawa is freezing: average highs of 2°C and lows of -8°C, around 64 mm of rain (mostly dry) and 87% humidity — about 23°C colder than Hong Kong.
👕 A down jacket, thermal base layers, scarf and gloves; big day–night swing, so dress in layers; snow is possible.
Ottawa in April
April in Ottawa is chilly: average highs of 11°C and lows of 0°C, around 85 mm of rain (some rain) and 78% humidity — about 18°C colder than Hong Kong.
👕 A sweater plus a coat or windbreaker; big day–night swing, so dress in layers.
Ottawa in MayBest month
May in Ottawa is mild and cool: average highs of 19°C and lows of 7°C, around 85 mm of rain (some rain) and 77% humidity — about 14°C colder than Hong Kong. It's one of the most comfortable months of the year to visit.
👕 Long sleeves with a light jacket or sweater; big day–night swing, so dress in layers.
Ottawa in JuneBest month
June in Ottawa is pleasantly warm: average highs of 24°C and lows of 13°C, around 104 mm of rain (some rain) and 79% humidity — about 10°C colder than Hong Kong. It's one of the most comfortable months of the year to visit.
👕 Short sleeves with a light long-sleeve or jacket for cool mornings and evenings; big day–night swing, so dress in layers.
Ottawa in JulyBest month
July in Ottawa is warm to hot: average highs of 26°C and lows of 16°C, around 98 mm of rain (some rain) and 79% humidity — about 8°C colder than Hong Kong. It's one of the most comfortable months of the year to visit.
👕 Short sleeves, plus a light layer for air-conditioned interiors; big day–night swing, so dress in layers.
Ottawa in AugustBest month
August in Ottawa is pleasantly warm: average highs of 25°C and lows of 15°C, around 88 mm of rain (some rain) and 78% humidity — about 9°C colder than Hong Kong. It's one of the most comfortable months of the year to visit.
👕 Short sleeves, plus a light layer for air-conditioned interiors; big day–night swing, so dress in layers.
Ottawa in SeptemberBest month
September in Ottawa is pleasantly warm: average highs of 22°C and lows of 10°C, around 87 mm of rain (some rain) and 78% humidity — about 12°C colder than Hong Kong. It's one of the most comfortable months of the year to visit.
👕 Short sleeves with a light long-sleeve or jacket for cool mornings and evenings; big day–night swing, so dress in layers.
FAQ
›What is the best time to visit Ottawa?
On temperature and rainfall, the most comfortable months in Ottawa are May, Jun, Jul, Aug, Sep and Oct. The hottest month is July (average high 26°C) and the coldest is January (average low -16°C).
›What's the weather like in Ottawa in October, and what should I wear?
October in Ottawa is chilly: average highs of 13°C and lows of 4°C, around 99 mm of rain (some rain) and 81% humidity — about 18°C colder than Hong Kong. It's one of the most comfortable months of the year to visit. What to wear: A sweater plus a coat or windbreaker; big day–night swing, so dress in layers.
›What's the weather like in Ottawa in November, and what should I wear?
November in Ottawa is cold: average highs of 5°C and lows of -3°C, around 73 mm of rain (mostly dry) and 85% humidity — about 21°C colder than Hong Kong. What to wear: A warm coat over a sweater, plus a scarf.
›When is the rainy season in Ottawa?
Ottawa is wettest in June, with about 104 mm on average, and driest in February, with about 55 mm.
›How cold does Ottawa get? Does it snow?
The coldest month is January, averaging -6°C by day and -16°C at night. Nights regularly drop below freezing and snow is possible.
Planning a trip to Ottawa?
More Canada weather
Popular destinations in October
Forecast data: Open-Meteo.com (CC BY 4.0), refreshed every 3 hours. Hottest month: July; coldest: January.