Oshawa climate

Name: Oshawa
Address: CA

Oshawa is warmest in July, with average highs of 25 °C, and coldest in February, when nights average -8.1 °C. June is the wettest month (88 mm) and February the driest (52 mm). Figures are 1991–2020 climate normals.

Across a full year Oshawa averages 892 mm of rain, 40 days above 25 °C and 115 days below freezing.

Canada · population 175,383 · 1991–2020 normals

Temperature below 0 °C to above 30 °C Rain band height is that month’s share of the wettest month

Warmest month July 25 °C
Coldest month February -8.1 °C
Driest month February 52 mm
Wettest month June 88 mm
Least cloud August 50 % cloud
Hottest on record July 34 °C
Coldest on record January -26 °C

What to expectOshawa through the year

Oshawa has a clear annual cycle: average daily highs run from -0.7 °C in February to 25 °C in July, a swing of 26 °C in mean temperature across the year.

Counted across a normal year, 40 days a year reach 25 °C, 2 of them reach 30 °C, 115 nights drop below freezing. The warmest reading in the 1991–2020 record is 34 °C, in July.

Rain is spread fairly evenly through the year, from 52 mm in February to 88 mm in June. There is no dry season to aim for.

Month by month

Month	Avg high	Rainfall	Cloud
January	-1.2 °C	67 mm	73 %
February	-0.7 °C	52 mm	68 %
March	3.6 °C	61 mm	63 %
April	10.0 °C	83 mm	63 %
May	16.4 °C	76 mm	60 %
June	21.9 °C	88 mm	57 %
July	25.2 °C	82 mm	51 %
August	24.7 °C	76 mm	50 %
September	21.0 °C	80 mm	52 %
October	14.1 °C	85 mm	61 %
November	7.4 °C	73 mm	69 %
December	2.0 °C	69 mm	74 %

Temperature month by month

Month	Avg high	Avg low	Mean	Record high	Record low	Days above 25 °C	Days above 30 °C	Days below 0 °C
January	-1.2 °C	-8.0 °C	-4.8 °C	13.9 °C	-26.0 °C	0	0	27
February	-0.7 °C	-8.1 °C	-4.8 °C	15.2 °C	-24.8 °C	0	0	26
March	3.6 °C	-3.8 °C	-0.6 °C	20.0 °C	-23.9 °C	0	0	24
April	10.0 °C	2.3 °C	5.8 °C	22.5 °C	-10.8 °C	0	0	8
May	16.4 °C	8.7 °C	12.4 °C	27.4 °C	-2.6 °C	1	0	0
June	21.9 °C	14.7 °C	18.2 °C	31.3 °C	5.9 °C	6	0	0
July	25.2 °C	18.1 °C	21.6 °C	33.6 °C	10.9 °C	15	1	0
August	24.7 °C	18.0 °C	21.3 °C	32.7 °C	10.7 °C	14	1	0
September	21.0 °C	14.6 °C	17.7 °C	30.2 °C	3.9 °C	4	0	0
October	14.1 °C	8.4 °C	11.0 °C	25.9 °C	-3.5 °C	0	0	0
November	7.4 °C	2.1 °C	4.6 °C	17.6 °C	-13.4 °C	0	0	8
December	2.0 °C	-3.4 °C	-0.9 °C	14.8 °C	-25.2 °C	0	0	22

Rain, sun and wind month by month

Month	Rainfall	Wet days	Daylight	Cloud cover	Humidity	Wind
January	67 mm	10	9.3 h/day	73 %	74 %	22 km/h
February	52 mm	8	10 h/day	68 %	73 %	21 km/h
March	61 mm	10	12 h/day	63 %	70 %	20 km/h
April	83 mm	11	13 h/day	63 %	68 %	21 km/h
May	76 mm	11	15 h/day	60 %	71 %	18 km/h
June	88 mm	11	15 h/day	57 %	73 %	17 km/h
July	82 mm	11	15 h/day	51 %	72 %	17 km/h
August	76 mm	10	14 h/day	50 %	73 %	16 km/h
September	80 mm	9	13 h/day	52 %	73 %	18 km/h
October	85 mm	11	11 h/day	61 %	73 %	20 km/h
November	73 mm	10	9.7 h/day	69 %	74 %	21 km/h
December	69 mm	10	8.9 h/day	74 %	75 %	21 km/h

How Oshawa compares

The same four figures for nearby destinations, so the numbers above have something to be read against. Summer high is the warmest month's average high; winter low is the coldest month's average low.

Destination	Summer high	Winter low	Rain per year	Days above 25 °C
Oshawa	25 °C	-8.1 °C	892 mm	40
Markham · Canada	26 °C	-9.3 °C	888 mm	51
Toronto · Canada	25 °C	-8.1 °C	806 mm	43
Vaughan · Canada	26 °C	-9.4 °C	812 mm	53
Etobicoke · Canada	26 °C	-7.9 °C	804 mm	52
Mississauga · Canada	26 °C	-8.6 °C	881 mm	57
Brampton · Canada	26 °C	-9.6 °C	828 mm	60

Where Oshawa ranks

Ranking	Position	Value
The coolest places in North America in May	8thof 50	16 °C
The coolest places in North America in April	10thof 50	10.0 °C
The coolest places in North America in February	15thof 50	-0.7 °C
The coolest places in North America in March	16thof 50	3.6 °C
The coolest places in North America year-round	16thof 50	12 °C
The coolest places in North America in January	23rdof 50	-1.2 °C

Planning a trip? See the best time to visit Oshawa.

QuestionsCommon questions about Oshawa’s climate

When is the best time to visit Oshawa?

That depends on what you want, so the honest answer is a comparison rather than a single month. June, July, August sit closest to 20 °C on average, July is the warmest month and February the driest. The month-by-month table above has the full picture.

How hot does Oshawa get?

In July, the warmest month, daily highs average 25 °C. About 2 days a year pass 30 °C. The highest value in the 1991–2020 record is 34 °C.

How cold does it get in winter?

Nights average -8.1 °C in February, the coldest month. A normal year has 115 nights below freezing.

Which month is wettest in Oshawa?

June, averaging 88 mm over 11 days with rain. The driest month is February with 52 mm. The year as a whole averages 892 mm.

Are these figures a forecast?

No. They are 1991–2020 climate normals: the average of thirty years, which describes what a month is usually like in Oshawa rather than what any particular week will bring. Individual years can differ substantially from the normal.

Data sources and method

ERA5 / ERA5-Land reanalysis — Copernicus Climate Change Service (C3S), ECMWF. Copernicus Licence
Open-Meteo — Open-Meteo.com. CC BY 4.0
NOAA OISST v2.1 — NOAA Physical Sciences Laboratory. Public domain
GeoNames — GeoNames.org. CC BY 4.0

Normal period: 1991–2020
Dataset version: era5-1991-2020-scores1.1
Last processed: 1 August 2026

Measured values come from ERA5 reanalysis and are reproduced unchanged. Calculated by us: monthly rankings, daylight hours, beach and comfort scores. Full formulas are on the methodology page.

Contains modified Copernicus Climate Change Service information 2026. Neither the European Commission nor ECMWF is responsible for any use that may be made of the Copernicus information or data it contains.