May weather forecastOttawa, Canada
May
Weather in May
By the time May dances into Ottawa's calendar, it carries the warmth and freshness of spring to its zenith. The weather becomes significantly benign with pleasant temperatures, increasing daylight hours and an evident reduction in wind speed. The city truly comes alive, with everything from the public parks to private gardens showcasing the region's biodiversity. Residents and visitors alike can enjoy outdoor activities, basking in warmth and relishing the gentle breezes.Temperature
The start of May in Ottawa brings a distinct shift in the average high-temperature, escalating from April's frosty 9.1°C (48.4°F) to a refreshing 17.7°C (63.9°F). During May, the average low-temperature is a chilly 7.1°C (44.8°F).Humidity
With an average relative humidity of 77%, May is the least humid month.Rainfall
In Ottawa, in May, it is raining for 16.4 days, with typically 73mm (2.87") of accumulated precipitation. In Ottawa, during the entire year, the rain falls for 149.6 days and collects up to 772mm (30.39") of precipitation.Snowfall
January through May, October through December are months with snowfall. May is the last month it regularly snows. During 0.4 snowfall days, in May, Ottawa aggregates 2mm (0.08") of snow. Throughout the year, in Ottawa, Canada, there are 83.3 snowfall days, and 1135mm (44.69") of snow is accumulated.Daylight
In May, the average length of the day in Ottawa is 14h and 55min.On the first day of the month, sunrise is at 5:49 am and sunset at 8:09 pm. On the last day of May, sunrise is at 5:17 am and sunset at 8:43 pm EDT.
Sunshine
In Ottawa, the average sunshine in May is 8.6h.UV index
The average daily maximum UV index in May is 4. A UV Index value of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV radiation for ordinary individuals.Note: The maximum UV index, 4 during May, leads to the following recommendations:
Act with care - The need to guard against sun damage is communicated. Limiting exposure to the direct Sun during midday hours can help prevent harmful UV radiation effects. Stay sun-safe with clothing that is both closely woven and worn loosely. Take to heart! Snow reflection can almost magnify the Sun's UV radiation twofold.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in May
Ottawa, Canada
- Average high temperature in May: 17.7°C
The warmest month (with the highest average high temperature) is July (25.3°C).
The month with the lowest average high temperature is January (-6.3°C).
- Average low temperature in May: 7.1°C
The month with the highest average low temperature is July (14.5°C).
The coldest month (with the lowest average low temperature) is January (-14.5°C).
Average pressure in May
Ottawa, Canada
- Average pressure in May: 1014.8mbar
The month with the highest atmospheric pressure is March (1018mbar).
The month with the lowest atmospheric pressure is June (1012.5mbar).
Average wind speed in May
Ottawa, Canada
- Average wind speed in May: 11.7km/h
The windiest month (with the highest average wind speed) is April (14km/h).
The calmest month (with the lowest average wind speed) is July (9.8km/h).
Average humidity in May
Ottawa, Canada
- Average humidity in May: 77%
The months with the highest relative humidity are January and February (91%).
The month with the lowest relative humidity is May (77%).
Average rainfall in May
Ottawa, Canada
- Average rainfall in May: 73mm
The wettest month (with the highest rainfall) is October (78mm).
The driest month (with the least rainfall) is September (54mm).
Average rainfall days in May
Ottawa, Canada
- Average rainfall days in May: 16.4 days
The month with the highest number of rainy days is July (17.1 days).
The month with the least rainy days is February (5.9 days).
Average snowfall in May
Ottawa, Canada
- Average snowfall in May: 2mm
The month with the highest snowfall is January (321mm).
The months with the least snowfall are June, July, August and September (0mm).
Average snowfall days in May
Ottawa, Canada
- Average snowfall days in May: 0.4 days
The month with the highest number of snowfall days is January (19.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in May /
Average sunshine in May
Ottawa, Canada
- Average daylight in May: 14h and 54min
The month with the longest days is June (Average daylight: 15h and 36min).
The month with the shortest days is December (Average daylight: 8h and 48min).
- Average sunshine in May: 8h and 36min
The month with the most sunshine is July (Average sunshine: 10h and 12min).
The month with the least sunshine is February (Average sunshine: 2h and 48min).
Average sunshine days in May
Ottawa, Canada
- Average sunshine days in May: 12.7 days
The month with the most sunshine days is September (15 days).
The month with the least sunshine days is February (9.1 days).
Average UV index in May
Ottawa, Canada
- Average UV index in May: 4
The months with the highest UV index are June, July and August (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 1).
Average cloud cover in May
Ottawa, Canada
- Average cloud cover in May: 43
The months with the most cloud cover are January and February (Cloud cover 69).
The month with the least cloud cover is July (Cloud cover 32).
Average visibility in May
Ottawa, Canada
- Average visibility in May: 9km
The months with the highest visibility are April, May, June, July, August and October (9km).
The months with the lowest visibility are January and February (7km).
