Ottawa Weather Forecast
Ottawa weather: 51°F, mainly clear. Hourly forecast, 14-day outlook, UV, air quality and the best time to visit.
Summary
Ottawa is a city in Ontario. Ottawa is known for Parliament Hill and the Rideau Canal. It has a population of about 1 million.
Right now it is 51°F (11°C) in Ottawa with mainly clear. It feels like 49°F. Today runs from 49°F to 67°F. Chance of precipitation is 4%. Sightseeing conditions score 9/10 - excellent - go now.
The best time to visit Ottawa is September. The climate is subarctic. January, February and December tend to be the least comfortable months. July is the warmest month with average highs near 80°F, while January is the coldest with lows near 9°F.
The closest major airport is Montreal-Trudeau International Airport (YUL), about 95 mi away. Nearby highlights include Mont-Tremblant National Park, Algonquin Provincial Park, Franconia Notch State Park and Watkins Glen State Park.
In plain terms. Today is slightly cooler than average for September. The forecast high of 67°F is 5.4°F below the 72°F typical for this month. The best window to be outside is roughly 3 PM to 6 PM, when temperature, rain chance and wind line up best. hiking is the strongest bet in Ottawa today at 9.7/10. No weather-related travel disruption is expected today. Roads and airports should run normally.
Compiled from this page's own data: atlas facts plus live Open-Meteo readings.
Weather in Ottawa right now
Source: Open-Meteo. Updated 4:07 AM, Sep 17 local time.
See the Ottawa forecast by time range
Next 24 hours
Hour-by-hour temperature, precipitation chance and wind.
16-day forecast for Ottawa
Daily highs and lows, precipitation and UV.
| Day | Conditions | High / Low | Precip | Wind | UV |
|---|---|---|---|---|---|
| Thu, Sep 17 | ☁️ Overcast | 67° / 49° | 4% | 5 mph | 5 |
| Fri, Sep 18 | ☁️ Overcast | 61° / 48° | 1% | 12 mph | 5 |
| Sat, Sep 19 | ☁️ Overcast | 61° / 41° | 4% | 7 mph | 5 |
| Sun, Sep 20 | ☁️ Overcast | 67° / 42° | 30% | 11 mph | 5 |
| Mon, Sep 21 | ☁️ Overcast | 60° / 41° | 2% | 11 mph | 4 |
| Tue, Sep 22 | ☁️ Overcast | 61° / 42° | 4% | 10 mph | 5 |
| Wed, Sep 23 | ☁️ Overcast | 65° / 42° | 17% | 8 mph | 5 |
| Thu, Sep 24 | 🌦️ Drizzle | 54° / 49° | 19% · 0,2 in | 6 mph | 1 |
| Fri, Sep 25 | 🌦️ Light drizzle | 54° / 46° | 12% · 0,0 in | 17 mph | 1 |
| Sat, Sep 26 | ☁️ Overcast | 51° / 44° | 9% | 14 mph | 3 |
| Sun, Sep 27 | ☁️ Overcast | 68° / 40° | 13% | 10 mph | 5 |
| Mon, Sep 28 | ☁️ Overcast | 76° / 51° | 16% | 13 mph | 3 |
| Tue, Sep 29 | 🌦️ Light drizzle | 78° / 60° | 13% · 0,0 in | 9 mph | 4 |
| Wed, Sep 30 | 🌦️ Light drizzle | 83° / 61° | 27% · 0,0 in | 9 mph | 4 |
| Thu, Oct 1 | 🌦️ Drizzle | 68° / 58° | 19% · 0,2 in | 6 mph | 2 |
| Fri, Oct 2 | ☀️ Clear sky | -- / -- | 29% | -- | — |
Climate in Ottawa month by month
Average high, average low and total rainfall, based on three years of reanalysis data.
| Month | Avg high | Avg low | Rainfall | Rating |
|---|---|---|---|---|
| January | 23° | 9° | 2,4 in | ★★☆☆☆ |
| February | 27° | 9° | 1,9 in | ★★☆☆☆ |
| March | 40° | 22° | 3,1 in | ★★☆☆☆ |
| April | 52° | 34° | 5,0 in | ★★★☆☆ |
| May | 65° | 48° | 3,4 in | ★★★★☆ |
| June | 76° | 59° | 5,4 in | ★★★★☆ |
| July | 80° | 64° | 4,4 in | ★★★★☆ |
| August | 77° | 61° | 4,1 in | ★★★★☆ |
| September | 72° | 55° | 1,5 in | ★★★★☆ |
| October | 60° | 45° | 2,9 in | ★★★★☆ |
| November | 42° | 31° | 2,4 in | ★★★☆☆ |
| December | 29° | 17° | 3,5 in | ★★☆☆☆ |
Climate type: Subarctic. Source: Open-Meteo archive (ERA5).
Weather map for Ottawa
Animated model layers. Pick a layer to load it.
Animated layers by Windy. For pin-level detail and nearby places, see the interactive map below.
Air quality and pollen in Ottawa
Air quality: Open-Meteo (CAMS). US AQI scale.
Sun, twilight and moon
Golden and blue hour are the standard photographic approximation around sunrise and sunset.
Best time to visit Ottawa
Go in September. These months score highest on comfortable temperatures, low rainfall and useful daylight.
Hardest months: January, February and December - expect the least comfortable mix of heat, cold or rain.
Explore Ottawa
Every topic we hold for this place, and the same topic for the places around it.
Weather for related places
Frequently asked questions
Where is Ottawa?
Ottawa is a city in Ontario. Its coordinates are 45.4215, -75.6972. It lies in North America.
What is the weather like in Ottawa right now?
It is currently 51°F (11°C) with mainly clear. Humidity is 90% and wind is 4 mph.
When is the best time to visit Ottawa?
September offer the most comfortable conditions in Ottawa, which has a subarctic climate. January, February and December are usually the hardest months for outdoor plans.
What time zone is Ottawa in?
Ottawa observes America/Toronto (UTC-04:00). The local time is 4:07 AM.
How many people live in Ottawa?
Ottawa has a population of approximately 1 million.
What is the nearest airport to Ottawa?
The closest airports are Montreal-Trudeau International Airport (YUL), 95 mi away and Toronto Pearson International Airport (YYZ), 228 mi away.
What are the top things to do in Ottawa?
Popular options include Mont-Tremblant National Park, Algonquin Provincial Park, Franconia Notch State Park, Watkins Glen State Park, CN Tower and Letchworth State Park.
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| Place data | USPOTUS Atlas dataset (cities-supported) - coordinates, hierarchy and facts. |
|---|---|
| Forecast and observations | Open-Meteo (ECMWF and national models). |
| Air quality and pollen | Copernicus CAMS via Open-Meteo. US AQI scale. |
| Climate averages | ERA5 reanalysis via the Open-Meteo archive, aggregated over 3 years. |
| Method | Scores, comparisons and advice on this page are computed from the inputs above. Distances are straight-line. Nothing is estimated where data is missing - the block is simply not shown. |
Last updated September 17, 2026 at 4:07 AM local time. Live blocks refresh every 15 minutes; climate averages monthly.
