What is the hottest month in Oshawa?

July — average highs around 78° with lows near 65°.

What is the coldest month in Oshawa?

January, when nights typically drop to 19° and days top out near 31°.

What is the rainiest month in Oshawa?

April, averaging about 4.3 in of precipitation; the driest is February at roughly 2.8 in.

How warm is Oshawa over the year?

The annual mean is 48°, with about 39 in of precipitation in a typical year (1991-2020 normals).

Oshawa Climate — Monthly Normals 1991-2020

Climate in Oshawa

The typical year in Oshawa (Ontario), from 1991-2020 normals. For what's happening now, see the current forecast; a month ahead — the 30-day outlook.

Annual mean temp

9.1°C

average across 12 months

Annual precipitation

984 mm

yearly total

Warmest month

Jul

⌀ max 25°C

Coldest month

Jan

⌀ min -7°C

Temperatures by month

typical high (orange) · typical low (blue)

Jan

19° … 31°

Feb

20° … 34°

Mar

27° … 41°

Apr

36° … 50°

May

48° … 62°

Jun

58° … 72°

Jul

65° … 78°

Aug

64° … 77°

Sep

58° … 71°

Oct

47° … 59°

Nov

35° … 45°

Dec

27° … 37°

Precipitation by month

monthly totals across the year

Jan

79 mm

Feb

70 mm

Mar

77 mm

Apr

108 mm

May

72 mm

Jun

77 mm

Jul

79 mm

Aug

82 mm

Sep

73 mm

Oct

99 mm

Nov

73 mm

Dec

95 mm

The short version

RegionOntario

Latitude43.9001°N

Annual mean9.1°C

Annual precipitation984 mm

More cities · climate

View all →

Markham Ontario

34 km →

Richmond Hill Ontario

Toronto Ontario

Vaughan Ontario

Etobicoke Ontario

Mississauga Ontario

Brampton Ontario

Oakville Ontario

Barrie Ontario

Burlington Ontario

Hamilton Ontario

Buffalo New York

Weather map — Oshawa

Oshawa →

Source · 1991-2020 normals

Oshawa, ON Climate