Ottawa in August
7.8out of 10
Yes, a good time to go
Warm and comfortable: highs around 28°C. Frequent rain: about 10 rainy days.
28°CAvg high
18°CAvg low
10Rainy days (89 mm)
13:40 hDaylight
06:10Sunrise · 19:49 Sunset
Why this score
- Warm and comfortable: highs around 28°C
- Frequent rain: about 10 rainy days
What to wear and pack
- T-shirts and light layers
- Shorts or a light skirt
- Rain jacket or compact umbrella
How reliable is the forecast?
Rainfall in August is fairly consistent from year to year (2.3 days). Averages cover 30 years (1991–2020). Individual days can differ a lot.
Year at a glance
Weather by month
| Month | Avg high | Avg low | Rainfall | Rainy days | Humidity | Sunshine | Score |
|---|---|---|---|---|---|---|---|
| January | 0°C | -8°C | 55 mm | 8 | – | – | 4.0 |
| February | 3°C | -5°C | 51 mm | 7 | – | – | 4.6 |
| March | 10°C | 0°C | 72 mm | 10 | – | – | 5.7 |
| April | 17°C | 6°C | 109 mm | 12 | – | – | 6.5 |
| May | 23°C | 12°C | 122 mm | 13 | – | – | 7.1 |
| June | 27°C | 17°C | 112 mm | 12 | – | – | 7.3 |
| July | 29°C | 19°C | 97 mm | 11 | – | – | 7.6 |
| August | 28°C | 18°C | 89 mm | 10 | – | – | 7.8 |
| September | 25°C | 14°C | 79 mm | 8 | – | – | 8.0 |
| October | 18°C | 7°C | 78 mm | 9 | – | – | 7.3 |
| November | 10°C | 1°C | 68 mm | 9 | – | – | 5.9 |
| December | 3°C | -4°C | 56 mm | 8 | – | – | 4.5 |
Frequently asked questions
How hot is Ottawa in August?
Daytime highs average 28°C and nights about 18°C.
When is the best time to visit Ottawa?
The best months are September, August, July.