Ottawa
May
Weather in Ottawa for May 2025
Your guide to Ottawa weather in May - trends and predictions
In general, the average temperature in Ottawa at the beginning of May is 13.7 °C. As the month progressed, temperatures tended to significantly warm up, reaching an average of 21 °C by the end of May.
With an average of 5 rainy days, Ottawa experiences minimal rainfall in May.
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26
Dry days
5
Rainy days
0
Snow days
20°/6°
Temperatures
15 km/h
Avg max wind
75 %
Avg humidity
Ottawa in May average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  12° | 2  13° | 3 11° | 4  11° | |||
| 5 12° | 6  18° | 7  19° | 8  14° | 9 14° | 10  17° | 11 18° |
| 12 17° | 13 15° | 14 18° | 15 21° | 16 16° | 17 16° | 18 17° |
| 19 21° | 20 19° | 21 21° | 22 21° | 23 22° | 24 13° | 25 17° |
| 26 20° | 27 21° | 28 22° | 29 20° | 30 22° | 31 25° |
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Temperatures trend during May in Ottawa
See the weather trend as well as the moving average line
May weather day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 May | Moderate or heavy rain shower | 12° /4° | 23.8 mm | 3 | |
| 2 May | Heavy rain at times | 13° /6° | 4.6 mm | 3 | |
| 3 May | Moderate or heavy rain shower | 11° /5° | 5.3 mm | 3 | |
| 4 May | Patchy rain possible | 11° /6° | 3.7 mm | 3 | |
| 5 May | Patchy rain possible | 12° /7° | 3.6 mm | 3 | |
| 6 May | Cloudy | 18° /7° | 0.3 mm | 4 | |
| 7 May | Overcast | 19° /7° | 0 mm | 5 | |
| 8 May | Sunny | 14° /6° | 1.1 mm | 4 | |
| 9 May | Sunny | 14° /4° | 0.5 mm | 4 | |
| 10 May | Partly cloudy | 17° /5° | 0.1 mm | 5 | |
| 11 May | Partly cloudy | 18° /7° | 2.1 mm | 5 | |
| 12 May | Cloudy | 17° /9° | 0.6 mm | 4 | |
| 13 May | Partly cloudy | 15° /6° | 2.6 mm | 5 | |
| 14 May | Partly cloudy | 18° /7° | 2.1 mm | 5 | |
| 15 May | Partly cloudy | 21° /7° | 0.1 mm | 5 | |
| 16 May | Heavy rain at times | 16° /7° | 2.4 mm | 4 | |
| 17 May | Sunny | 16° /6° | 0.6 mm | 5 | |
| 18 May | Sunny | 17° /7° | 1.2 mm | 5 | |
| 19 May | Overcast | 21° /7° | 0 mm | 5 | |
| 20 May | Moderate or heavy rain shower | 19° /13° | 16.1 mm | 4 | |
| 21 May | Patchy rain possible | 21° /12° | 3.3 mm | 5 | |
| 22 May | Sunny | 21° /8° | 1.3 mm | 6 | |
| 23 May | Sunny | 22° /9° | 0.1 mm | 6 | |
| 24 May | Moderate or heavy rain shower | 13° /6° | 8 mm | 3 | |
| 25 May | Sunny | 17° /4° | 0.7 mm | 5 | |
| 26 May | Overcast | 20° /7° | 0 mm | 5 | |
| 27 May | Sunny | 21° /9° | 8.1 mm | 6 | |
| 28 May | Sunny | 22° /10° | 2.9 mm | 6 | |
| 29 May | Sunny | 20° /9° | 0 mm | 5 | |
| 30 May | Sunny | 22° /7° | 0 mm | 6 | |
| 31 May | Sunny | 25° /10° | 0 mm | 7 | |
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Important Notice
Our weather forecast for Ottawa in May 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 May - FAQ
What are the expected maximum and minimum temperatures in Ottawa during May?
Enjoy moderate daytime temperatures of up to 20° and cooler nights around 6°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Ottawa during May?
Significant rainfall exceeding 167.5 mm is expected in Ottawa during May, occurring over more than 5 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Ottawa during May?
The average wind speed in Ottawa during May is 15 km/h, suggesting breezy to windy conditions, depending on your activities.
May rainfall patterns in Ottawa
Explore the daily rainfall trends and prepare for Ottawas May weather 💧
UV exposure in Ottawa during May
Stay informed about UV levels for safe outdoor activities throughout the month of May ☀️
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