The climate in Ottawa during May can be summarized as mild and reasonably dry.
May is in the spring in Ottawa and is typically the 5th warmest month of the year. Daytime maximum temperatures average around a cool 18°C (65°F), whilst at night 7°C (45°F) is normal.
|Daytime temperature||18.4°C 65.1°F|
|Nightly temperature||7°C 44.6°F|
|Average temperature||12.7°C 54.9°F|
|Daily sunshine||7.9 hrs|
|Avg rainfall||73 mm 2.9 ins|
|Rainy days||12 days|
|Sea temperature||5.6°C 42.1°F|
|Windspeed||12.6kph 8 mph|
On average May is the 6th driest month of the year in Ottawa with around 73mm 2.9 inches of rain making it a reasonably dry time to visit. This rainfall is typically spread over 12 days, although this may vary considerably.
On the flip side this corresponds to an average of 7.9 hours of sunshine per day.
The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in May 2019.
|Hottest month:||July||25.9°C 78.6°F|
|Driest month:||February||58mm 2.3ins|
|Coldest month:||January||-6.6°C 20.1°F|
|Wettest month:||July||88mm 3.5ins|