What is the hottest month in London?

July — average highs around 80° with lows near 63°.

What is the coldest month in London?

February, when nights typically drop to 19° and days top out near 35°.

What is the rainiest month in London?

July, averaging about 4.4 in of precipitation; the driest is September at roughly 2.6 in.

How warm is London over the year?

The annual mean is 49°, with about 41 in of precipitation in a typical year (1991-2020 normals).

London Climate — Monthly Normals 1991-2020

Climate in London

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

Annual mean temp

9.5°C

average across 12 months

Annual precipitation

1037 mm

yearly total

Warmest month

Jul

⌀ max 26°C

Coldest month

Feb

⌀ min -7°C

Temperatures by month

typical high (orange) · typical low (blue)

Jan

19° … 31°

Feb

19° … 35°

Mar

28° … 44°

Apr

36° … 54°

May

48° … 68°

Jun

59° … 77°

Jul

63° … 80°

Aug

62° … 78°

Sep

57° … 73°

Oct

46° … 60°

Nov

34° … 46°

Dec

27° … 37°

Precipitation by month

monthly totals across the year

Jan

85 mm

Feb

73 mm

Mar

80 mm

Apr

106 mm

May

73 mm

Jun

95 mm

Jul

112 mm

Aug

94 mm

Sep

65 mm

Oct

99 mm

Nov

69 mm

Dec

86 mm

The short version

RegionOntario

Latitude42.9834°N

Annual mean9.5°C

Annual precipitation1037 mm

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Weather map — London

London →

Source · 1991-2020 normals

London, ON Climate