In general the best time to visit Ottawa is probably July, when the weather is usually great. The hottest months are June, July, August, while the coldest months are January, February, December.
May, June, July, August, September usually has good weather. Average maximum temperature reaches +27°C during July.
In January, February, March, April, October, November, December the weather is average. Expect around 27 rainy days, and the precipitation amounts to approximately 89 mm in October.
Climate in Ottawa
Here is the detailed breakdown of the climate in Ottawa for each month:
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Maximum Temperature
+13°C
+13°C
+27°C
+32°C
+35°C
+36°C
+36°C
+36°C
+35°C
+28°C
+23°C
+17°C
Average Maximum Temperature
-5°C
-3°C
+3°C
+12°C
+20°C
+24°C
+27°C
+25°C
+21°C
+13°C
+6°C
-1°C
Minimum Temperature
-36°C
-31°C
-29°C
-18°C
-5°C
0°C
+6°C
+4°C
-3°C
-8°C
-20°C
-33°C
Humidity, %
73
69
66
61
62
67
68
72
75
75
76
78
Rain, mm
13
11
28
71
85
91
90
84
90
89
54
22
Snow, mm
47
47
38
16
0
0
0
0
0
5
26
50
Average wind speed, m/s
3
3
3
3
3
2
2
2
2
2
3
3
Sunny Days
3
3
5
4
3
3
4
4
5
3
2
2
Cloud Days
22
19
19
17
20
18
18
20
18
19
20
21
Rainy Days
1
1
3
7
8
9
9
7
7
8
5
2
Snowy Days
5
5
4
2
0
0
0
0
0
1
3
6
Average Temperature
Here are the average maximum and minimum temperatures in Ottawa during the whole year:
The hottest month in Ottawa is July with average maximum temperature going up to +27°C. The coldest month is January with the lowest temperatures of -14°C.
Humidity
The temperature feels different depending on humidity. Here is how humidity in Ottawa looks throughout the year, in %:
The most humid month in Ottawa is December with average humidity going up to 78%. The least humid month is April with an average humidity of 61%.
Rain
Amount of rainfall in mm. in Ottawa during the whole year based on historical data:
The sunniest and driest month is March with approximately 5 sunny days and a total precipitation of around 28 mm. The rainiest and wettest month is June with approximately 9 rainy days and 91 mm of total precipitation.
Snow
Amount of snow in mm. in Ottawa during the whole year based on historical data:
The snowiest month is December with approximately 6 snowy days.
FAQ
Frequently asked questions about the weather in Ottawa:
What is the hottest month in Ottawa?
The hottest month in Ottawa is July with average maximum temperature of +27°C.
What is the coldest month in Ottawa?
The coldest month in Ottawa is January with minimum temperatures of -14°C.
Is Ottawa worth visiting in winter?
Winter in Ottawa could be a good time to visit, as the weather is generally ok.
When does it rain the least in Ottawa?
if you're looking to visit Ottawa when it rains the least, you should plan your trip for June, September, July. During this time, rainfall is rare with the driest month being February with only 11 mm of rain.
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.