Weather for Ottawa in August is typically good with an average maximum temperature of +77°F during the day, and approximately 4 sunny days monthly. Typically, there are about 7 rainy days with the total average precipitation that falls in August around 84 mm. Expect good weather and pack accordingly to enjoy the outdoors. Search flightsin one click on Avionero.
Average weather
☀️
+77°F
Avg. max. temperature
+39°F
Min.
+97°F
Max.
84 mm
Total precipitation
72%
Avg. humidity
2 m/s
Avg. wind
4 ☀️
Sunny Days
20 ⛅️
Cloudy
7 🌦
Rainy
Our opinion: Ottawa has good weather in August.
Average temperature in Ottawa in August
Here are the expected maximum, average and minimum temperatures in Ottawa for August based on the historical data.
Last Year
Historical Data
The temperature in August is +79°F on average, with a range between a maximum of +90°F during the day and a minimum of +52°F at night.
The average maximum temperature goes down 33% by the end of the month, compared with the beginning of the month, from +84°F to +72°F.
Is Ottawa warm or cold in August?
Ottawa is typically warm in August.
Maximum temperatures go up compared to the previous month from +81°F to +77°F. The minimum temperature also goes down from +61°F to +59°F.
It’s generally warm, but pack a long-sleeve shirt for evenings.
August is one of the warmest months in Ottawa, here is the comparison with other months:
Climate in Ottawa in August
Ottawa weather looks like this, on average, in August and the surrounding months.
July
August
September
Avg. temperature
+81°F
+77°F
+70°F
Min. temperature
+43°F
+39°F
+27°F
Max. temperature
+97°F
+97°F
+95°F
Rainfall
90 mm
84 mm
90 mm
Wind
2 m/s
2 m/s
2 m/s
Humidity
68%
72%
75%
Air pressure
1012 HPa
1014 HPa
1015 HPa
Sunny days
4
4
5
Cloudy days
18
20
18
Rainy days
9
7
7
Snowy days
0
0
0
August weather is still as good as in July.It’s getting colder in August. From +81°F in the day, the average maximum temperature lowers to +77°F.As August arrives, the amount of rainfall goes down. On average, the rainfall volume decreases from 90 mm to 84 mm.Humidity rises from 68% to 72%.The average wind speed doesn’t change much during August, staying around 2 m/s.The amount of sunny days stay about the same, averaging 4 sunny days during the month.
September brings much the same weather, it remains good.
Wind speed in Ottawa in August based on historical data.
Last Year
Historical Data
The average wind speed is 3 m/s getting up to 4 m/s which is a light breeze; barely moving the tree leaves.
The average wind speed in Ottawa is gradually increasing during August, going from 4 m/s to 4 m/s over the course of the month.
Rain
Amount of rainfall in mm during August in Ottawa based on historical data.
Last Year
Historical Data
Typically, there is a 48% chance of rain on an average day in August, with total rainfall of approximately 133 mm. The maximum amount of rainfall per day is around 22 mm, which is considered light rain.August is a pretty wet month with over 15 rainy days, so don’t forget to pack an umbrella, raincoat, and a pair of wellies.
Here’s how August is compared with other months in the amount of precipitation, total mm:
Ottawa wettest month is June, where a typical day has a 30% chance of precipitation and 91 mm of rainfall per day. February, on the other hand, is the driest month with a mere 3% chance of precipitation and 11 mm of rainfall per day.
How was the weather last August in Ottawa?
This is the weather in Ottawa in August 2023:
1 August
☁️
+84°F
2 August
☁️
+78°F
3 August
☁️
+81°F
4 August
🌧️
+83°F
5 August
☁️
+84°F
6 August
☀️
+90°F
7 August
☁️
+88°F
8 August
🌧️
+75°F
9 August
🌧️
+66°F
10 August
☁️
+78°F
11 August
☀️
+77°F
12 August
☀️
+73°F
13 August
☀️
+78°F
14 August
☀️
+79°F
15 August
☀️
+81°F
16 August
☁️
+81°F
17 August
☁️
+82°F
18 August
☁️
+80°F
19 August
☁️
+86°F
20 August
☁️
+86°F
21 August
☁️
+78°F
22 August
🌧️
+77°F
23 August
🌧️
+73°F
24 August
☁️
+83°F
25 August
☁️
+75°F
26 August
🌧️
+68°F
27 August
☁️
+73°F
28 August
☁️
+80°F
29 August
☁️
+87°F
30 August
☁️
+78°F
31 August
☁️
+72°F
In August 2023 Ottawa had 6 sunny days, 19 cloudy days, and 4 rainy days. The average maximum temperature was +79°F, with an absolute maximum of +90°F and a minimum of +66°F. The average humidity was 76%, with a maximum of 100% and a minimum of 39%. The average wind speed was 3 m/s, with a maximum of 10 m/s and a minimum of 0 m/s.
Are you planning a trip in August?
Climate Change Over the Years
This is how Ottawa climate has changed over the last 43 years.
The climate in Ottawa in August has not changed that much over the last 43 years.
The average temperature was the lowest in 1986 (+74°F) and the highest in 2021 (+85°F). The driest year was 1980 with only 34 mm of rainfall, and the wettest year was 2020 with 319 mm.
FAQ
Frequently asked questions about the weather in Ottawa in August:
Is August a good time to visit Ottawa?
August is a really good time to go to Ottawa. The weather is nice so plan your packing around outdoor activities and exploring. Check out other good time to visit Ottawa.
Can you sunbathe in Ottawa in August?
August is warm in Ottawa. You may enjoy some beach or pool time in the day, but pack something a tad warmer for the evening.
Is Ottawa rainy in August?
Ottawa is often rainy in August. You may get a bit damp when outside, so pack an umbrella, and maybe even a raincoat.
Is it sunny in Ottawa in August?
Usually, it’s not very sunny in Ottawa in August, often it’s pretty cloudy. Pack for any eventuality; layering can help reduce the number of bulky items needed.
For this page, we’ve looked at the typical weather in Ottawa, based on historical hourly weather data from January 1, 1979, to December 31, 2022.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.