🇨🇦 Weather in Ottawa
Map Overlays:
Hourly Forecast for Ottawa
23:00
18°
14%
00:00
16°
13%
01:00
16°
12%
02:00
16°
27%
03:00
16°
12%
04:00
15°
13%
05:00
15°
14%
06:00
15°
18%
07:00
16°
21%
08:00
17°
14%
09:00
19°
8%
10:00
20°
15%
11:00
21°
6%
12:00
22°
6%
13:00
21°
14%
14:00
21°
14%
15:00
22°
8%
16:00
22°
7%
17:00
20°
31%
18:00
18°
25%
19:00
18°
25%
20:00
18°
26%
21:00
17°
20%
22:00
17°
24%
14-Day Forecast for Ottawa
2026-09-03
Sunny
26° /
18°
2026-09-04
Overcast
22° /
15°
2026-09-05
Overcast
22° /
12°
2026-09-06
Sunny
22° /
10°
2026-09-07
Sunny
24° /
12°
2026-09-08
Overcast
18° /
7°
2026-09-09
Overcast
12° /
10°
Additional Forecasts for Ottawa
Air Quality
💨 US EPA Index 1 (Good)
CO (Carbon Monoxide) 296.0 μg/m³
O₃ (Ozone) 39.0 μg/m³
NO₂ (Nitrogen Dioxide) 17.2 μg/m³
SO₂ (Sulphur Dioxide) 2.1 μg/m³
PM2.5 (Fine particles) 9.3 μg/m³
PM10 (Coarse particles) 9.3 μg/m³
Historical Weather
Weather Forecasts for Other Cities in Canada
Weather in Ottawa — FAQ
Answers refreshed each request based on current conditions in Ottawa.
What is the weather like right now in Ottawa?
Right now in Ottawa, Canada the temperature is 18.3°C (feels like 19.1°C), with clear. Relative humidity is 87% and wind is 6.5 km/h.
What is today's high and low temperature in Ottawa?
Today's forecast high in Ottawa is 25.9°C and the overnight low is 18.0°C. The diurnal range — high minus low — depends on cloud cover; clear days swing more than overcast ones.
Will it rain in Ottawa today?
The chance of precipitation in Ottawa today is 77%. Forecast accuracy is highest within the next 6 hours and decreases steadily out to 14 days.
How often does the weather here update?
Current observations refresh every 15-60 minutes from the nearest monitoring stations operated by national meteorological agencies. The hourly forecast updates approximately every hour; the 7- and 14-day outlook is recomputed several times per day.
What does 'feels like' temperature mean?
Feels-like (apparent) temperature accounts for humidity, wind chill and direct sunshine — variables that change how the human body perceives heat or cold. On hot, humid days it can be 3-7°C above the actual reading; on cold windy days it can be 5-15°C below.
Why does the temperature in Ottawa differ from nearby cities?
Even short distances can change temperatures noticeably. Ottawa's reading reflects altitude, proximity to large bodies of water, urban heat island effects, and the exact location of the monitoring stations supplying the data. Coastal cities are typically milder and more humid than inland equivalents.