Ottawa in May
7.1out of 10
Possible, with caveats
Warm and comfortable: highs around 23°C. Frequent rain: about 13 rainy days.
23°CAvg high
12°CAvg low
13Rainy days (122 mm)
14:19 hDaylight
05:42Sunrise · 20:01 Sunset
Why this score
- Warm and comfortable: highs around 23°C
- Frequent rain: about 13 rainy days
- Rain varies a lot between years (±4.1 days)
What to wear and pack
- T-shirts and light layers
- A light jacket for cooler evenings
- Rain jacket or compact umbrella
How reliable is the forecast?
Rain in May varies a lot between years (±4.1 rainy days), so check the forecast closer to your trip. 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 May?
Daytime highs average 23°C and nights about 12°C.
When is the best time to visit Ottawa?
The best months are September, August, July.