Monthly climate averages for Ottawa. Based on 10-year ERA5 reanalysis data.
Dfb Warm-Summer Continental
Climate OverviewCanada in May has mild conditions, with highs averaging 20°C (68°F) and noticeably cooler mornings. Rain falls on about 11 days this month. Temperatures drop noticeably between day and night.
This month falls at the end of Spring.
Compared to April, this month is about 8°C warmer with 1 fewer rainy days. Temperatures will rise further into June.
Daytime temperatures around 20°C (68°F) are ideal for full-day outdoor exploration.
Rain usually comes in shorter passing showers rather than all-day rain.
Weather conditions this month are among the best of the year, making it a popular time for outdoor activities.
Dress in layers — a mix of long sleeves, light sweaters, and a versatile jacket works best for changeable conditions. Temperatures drop significantly at night, so pack layers you can add or remove throughout the day. A waterproof jacket and shoes are non-negotiable — showers are frequent.
| Month | Temp | Feels Like | Rain | Sun | Humidity | Status | Details |
|---|---|---|---|---|---|---|---|
| January | -4°C / -12°C | -8°C / -17°C | 10days (72 mm) Wet | 5.2h Fair | 78% Humid | Poor | View Details |
| February | -2°C / -12°C | -7°C / -18°C | 11days (67 mm) Wet | 6.6h Fair | 73% Muggy | Poor | View Details |
| March | 5°C / -5°C | 1°C / -10°C | 13days (86 mm) Wet | 7.9h Good | 68% Muggy | Poor | View Details |
| April | 12°C / 2°C | 9°C / -2°C | 12days (108 mm) Wet | 9h Good | 63% Muggy | Poor | View Details |
| May best | 20°C / 8°C | 19°C / 5°C | 11days (82 mm) Wet | 10.8h Excellent | 63% Muggy | Good | View Details |
| June best | 24°C / 14°C | 25°C / 13°C | 13days (103 mm) Wet | 11.5h Excellent | 71% Muggy | Excellent | View Details |
| July best | 27°C / 16°C | 29°C / 17°C | 12days (110 mm) Wet | 12.2h Excellent | 75% Muggy | Excellent | View Details |
| August best | 25°C / 15°C | 27°C / 15°C | 12days (109 mm) Wet | 10.8h Excellent | 78% Humid | Excellent | View Details |
| September best | 22°C / 10°C | 21°C / 9°C | 8days (69 mm) Wet | 9.6h Good | 78% Humid | Excellent | View Details |
| October | 15°C / 5°C | 13°C / 2°C | 11days (89 mm) Wet | 7.1h Good | 78% Humid | Fair | View Details |
| November | 6°C / -1°C | 2°C / -5°C | 12days (72 mm) Wet | 5.3h Fair | 77% Humid | Poor | View Details |
| December | 0°C / -7°C | -5°C / -12°C | 14days (95 mm) Wet | 3.7h Poor | 80% Humid | Poor | View Details |
Last updated:
We use cookies to analyze traffic and improve your experience. No personal data is sold or shared with advertisers.
We use Google Analytics to understand how visitors use WorldStats. This helps us improve content and performance. Analytics cookies track page views and session data — no personally identifiable information is collected. You can change your preference at any time from the footer.
