August weather forecastOttawa, Canada
August
Weather in August
As August strolls into Ottawa, it carries the last hints of summer along. There's a slight slip in temperatures from July's peak, yet the weather remains hospitable for outdoor activities. Despite the impending arrival of autumn, August keeps up the summer spirit with its warm days and balmy nights. It is during this time of the year that Ottawa experiences a fine blend of summer's warmth and autumn's cool.Temperature
As Ottawa, Canada, welcomes August, the average high-temperature stabilizes at a still warm 24°C (75.2°F), showing little deviation from July's 25.3°C (77.5°F). During the month of August, an average temperature of 13.7°C (56.7°F) is noted during the nights.Humidity
In Ottawa, the average relative humidity in August is 81%.Rainfall
In Ottawa, in August, during 15.9 rainfall days, 68mm (2.68") of precipitation is typically accumulated. In Ottawa, during the entire year, the rain falls for 149.6 days and collects up to 772mm (30.39") of precipitation.Snowfall
In Ottawa, snow does not fall in June through September.Daylight
The average length of the day in August in Ottawa is 14h and 3min.On the first day of the month, sunrise is at 5:47 am and sunset at 8:30 pm. On the last day of August, sunrise is at 6:23 am and sunset at 7:41 pm EDT.
Sunshine
The average sunshine in August is 9.9h.UV index
June through August, with an average maximum UV index of 5, are months with the highest UV index in Ottawa. A UV Index reading of 3 to 5 represents a medium health hazard from unsafe exposure to UV radiation for the ordinary person.Note: The average daily UV index of 5 in August transforms into the following instructions:
Make use of precautions - Suggestions to resist sunburn are communicated. The Sun's UV radiation is especially harmful around midday, so reduce exposure and stay safe. For minimizing sun-related eye damage, always choose sunglasses with UVA and UVB coverage.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in August
Ottawa, Canada
- Average high temperature in August: 24°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 August: 13.7°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 August
Ottawa, Canada
- Average pressure in August: 1014.1mbar
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 August
Ottawa, Canada
- Average wind speed in August: 10km/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 August
Ottawa, Canada
- Average humidity in August: 81%
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 August
Ottawa, Canada
- Average rainfall in August: 68mm
The wettest month (with the highest rainfall) is October (78mm).
The driest month (with the least rainfall) is September (54mm).
Average rainfall days in August
Ottawa, Canada
- Average rainfall days in August: 15.9 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 August
Ottawa, Canada
- Average snowfall in August: 0mm
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 August
Ottawa, Canada
- Average snowfall days in August: 0 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 August /
Average sunshine in August
Ottawa, Canada
- Average daylight in August: 14h and 0min
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 August: 9h and 54min
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 August
Ottawa, Canada
- Average sunshine days in August: 13.2 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 August
Ottawa, Canada
- Average UV index in August: 5
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 August
Ottawa, Canada
- Average cloud cover in August: 34
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 August
Ottawa, Canada
- Average visibility in August: 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).
