Weather in Ottawa in August

General weather information about Ottawa

Average annual temperature is 8.1 °C

Absolute maximum temperature: 33.5 °C

Absolute minimum temperature: -31.6 °C

Number of sunny days: 124 days

Number of rainy days: 188 days

Number of snow days: 53 days

Look at detailed online map of Ottawa

* Weather data for Ottawa Canada is based on climate observations for 2026 year

Ottawa air temperature forecast for each month

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Absolute maximum temperature (°C)	4.5	11.0	7.6	27.5	31.6	33.5	32.2	27.0	32.1	29.1	14.3	9.7
Average daytime temperature (°C)	-1.2	-0.3	3.3	13.7	19.6	24.9	26.7	23.9	23.2	16.0	5.2	2.0
Average temperature (°C)	-5.0	-6.6	-1.3	6.8	12.9	19.0	21.8	19.1	17.6	12.0	1.3	-1.3
Average night temperature (°C)	-8.5	-11.4	-5.2	1.0	6.4	13.6	17.5	15.2	13.1	8.8	-1.8	-3.8
Absolute minimum temperature (°C)	-19.4	-31.6	-12.9	-10.0	1.1	8.8	13.1	10.7	7.6	-1.6	-8.5	-14.5

Ottawa monthly weather indicators

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Daylight maximum duration (h)	9.0	11.0	12.0	14.0	15.0	15.0	15.0	14.0	13.0	11.0	10.0	8.0
Daylight mean duration (h)	9.2	10.4	11.9	13.5	14.9	15.6	15.3	14.1	12.5	11.0	9.5	8.8
Daylight minimum duration (h)	8.0	9.0	11.0	12.0	14.0	15.0	14.0	13.0	11.0	10.0	9.0	8.0
Sunshine mean duration (h)	3.2	5.3	6.5	8.1	11.0	10.3	11.5	10.0	9.8	5.3	4.8	2.5
Precipitation (mm)	117	85	84	90	93	102	218	120	17	99	44	95
Sunny days	6	7	11	12	21	10	1	7	19	10	11	9
Rainy days	8	9	9	18	10	20	30	24	11	21	12	16
Snow days	17	12	11	0	0	0	0	0	0	0	7	6

Ottawa - weather forecast by months

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Best time to visit Ottawa:

The best time to visit Ottawa during the most sunny months:

May — 11.0(h)
June — 10.3(h)
July — 11.5(h)
August — 10.0(h)
September — 9.8(h)

Months with the longest average daylight duration in Ottawa:

June — 15.6(h)
July — 15.3(h)

The largest precipitation sum in Ottawa is at

July — 218(mm)

Weather forecast in the closest to Ottawa admin centers