Ottawa Weather Forecast
Ottawa weather: 52°F, clear. Hourly forecast, 14-day outlook, UV, air quality and the best time to visit.
14-day forecast for Ottawa
Daily highs and lows, precipitation and UV.
| Day | Conditions | High / Low | Precip | Wind | UV |
|---|---|---|---|---|---|
| Thu, Sep 17 | ☁️ Overcast | 68° / 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 |
The two-week trend
Warming. The second half of the window averages 35°F warmer than the days immediately ahead.
The window averages 65°F against a September normal of 72°F - 39°F below.
The next 7 days look unusually dry - roughly 0% of a normal September week (0,0 in against 0,4 in).
What this means for Ottawa
Today is slightly cooler than average for September. The forecast high of 68°F is 4.5°F below the 72°F typical for this month.
Rain is very unlikely today - plans do not need a backup.
No weather-related travel disruption is expected today. Roads and airports should run normally.
Northern Hemisphere, so peak summer falls in June to August.
The gap between the warmest and coldest month averages 88°F.
What to pack, what to skip
- A warm mid-layer and gloves for early mornings and evenings
- If your dates are flexible, avoid January, February and December - historically the least comfortable months here.
See the Ottawa forecast by time range
Ottawa weather - more answers
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 52°F (11°C) with clear. Humidity is 90% and wind is 1 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 3:37 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 3:37 AM local time. Live blocks refresh every 15 minutes; climate averages monthly.
