easeweather.com

Weather in Ottawa for August 2025

Your guide to Ottawa weather in August - trends and predictions
  • In general, the average temperature in Ottawa at the beginning of August is 24.7 °C. As the month progressed, temperatures tended to noticeably cool down, reaching an average of 22.6 °C by the end of August.

  • Ottawa experiences an exceptionally high level of rainfall in August, with more than 20 rainy days on average.

  • New! Chat with our AI weatherman - it’s amazing and free.
Average dry days
10
Dry days
Average rainy days
21
Rainy days
Average snowy days
0
Snow days
Average temperatures
23°/13°
Temperatures
Average wind speed
15 km/h
Avg max wind
Average humidity
77 %
Avg humidity

Ottawa in August average weather

Move between months or click on a day
Select a date

You can click on date

Access Ottawa weather forecasts with a simple click. Select any date for comprehensive insights on temperature, rainfall, and wind conditions.
Got it

Temperatures trend during August in Ottawa

See the weather trend as well as the moving average line

August weather day by day

Click on a date for more information
Date Weather Temperatures Rain UV More
1 Aug. Patchy rain possible
Patchy rain possible
25° /14° 0.6 mm 6
2 Aug. Overcast
Overcast
27° /15° 0 mm 7
3 Aug. Moderate or heavy rain shower
Moderate or heavy rain shower
26° /17° 19 mm 6
4 Aug. Patchy rain possible
Patchy rain possible
27° /16° 2.1 mm 6
5 Aug. Overcast
Overcast
23° /13° 3.3 mm 5
6 Aug. Overcast
Overcast
24° /12° 0 mm 6
7 Aug. Moderate or heavy rain shower
Moderate or heavy rain shower
21° /13° 7.9 mm 5
8 Aug. Moderate or heavy rain shower
Moderate or heavy rain shower
21° /13° 21.6 mm 5
9 Aug. Patchy rain possible
Patchy rain possible
24° /16° 10.3 mm 6
10 Aug. Moderate or heavy rain shower
Moderate or heavy rain shower
22° /13° 12 mm 5
11 Aug. Patchy rain possible
Patchy rain possible
21° /12° 4.2 mm 5
12 Aug. Moderate or heavy rain shower
Moderate or heavy rain shower
22° /12° 11.7 mm 5
13 Aug. Patchy rain possible
Patchy rain possible
24° /13° 0.8 mm 5
14 Aug. Patchy rain possible
Patchy rain possible
25° /14° 1 mm 6
15 Aug. Patchy rain possible
Patchy rain possible
25° /15° 0.3 mm 6
16 Aug. Patchy rain possible
Patchy rain possible
27° /16° 0.5 mm 6
17 Aug. Patchy rain possible
Patchy rain possible
24° /17° 7.6 mm 6
18 Aug. Moderate or heavy rain shower
Moderate or heavy rain shower
22° /16° 18.3 mm 5
19 Aug. Overcast
Overcast
19° /12° 1.6 mm 4
20 Aug. Cloudy
Cloudy
21° /11° 0.3 mm 5
21 Aug. Patchy rain possible
Patchy rain possible
21° /11° 0.9 mm 5
22 Aug. Patchy rain possible
Patchy rain possible
21° /11° 0.4 mm 5
23 Aug. Patchy rain possible
Patchy rain possible
24° /13° 0.1 mm 6
24 Aug. Patchy rain possible
Patchy rain possible
23° /13° 1.4 mm 5
25 Aug. Fog
Fog
23° /14° 2.4 mm 6
26 Aug. Light rain shower
Light rain shower
23° /15° 6.5 mm 6
27 Aug. Cloudy
Cloudy
25° /12° 0.2 mm 6
28 Aug. Mist
Mist
22° /12° 1.6 mm 5
29 Aug. Patchy rain possible
Patchy rain possible
23° /9° 0.9 mm 6
30 Aug. Moderate or heavy rain with thunder
Moderate or heavy rain with thunder
20° /10° 0.8 mm 5
31 Aug. Partly cloudy
Partly cloudy
22° /11° 2 mm 6
Next
Important Notice
Our weather forecast for Ottawa in August is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Ottawa forecast closer to your planned date for the most up-to-date weather information.

Ottawa in August - FAQ

What are the expected maximum and minimum temperatures in Ottawa during August?
Enjoy moderate daytime temperatures of up to 23° and cooler nights around 13°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Ottawa during August?
Significant rainfall exceeding 193.9 mm is expected in Ottawa during August, occurring over more than 21 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Ottawa during August?
The average wind speed in Ottawa during August is 15 km/h, suggesting breezy to windy conditions, depending on your activities.

August rainfall patterns in Ottawa

Explore the daily rainfall trends and prepare for Ottawas August weather 💧

UV exposure in Ottawa during August

Stay informed about UV levels for safe outdoor activities throughout the month of August ☀️
Top locations in Ottawa
Select a location for an accurate weather forecast
More Locations

Quick links

Location coordinates Where is Ottawa?

Get accurate weather forecasts for Ottawa, located at latitude 45.411 and longitude -75.698. Stay updated with localized weather information tailored for Ottawa.

Related locations
Select a location for accurate weather forecast
More Locations
Found a mistake?
We appreciate your attention to details. Tell us here.