Sarnia Climate: Weather by Month and Best Time to Visit

Best months for Sarnia: September, August, June, July.

Best time to visit

Year at a glance

Jan 3.8 Feb 4.0 Mar 4.8 Apr 6.0 May 6.9 Jun 7.6 Jul 7.6 Aug 7.7 Sep 7.9 Oct 6.5 Nov 5.5 Dec 4.2

Weather by month

Month	Avg high	Avg low	Rainfall	Rainy days	Humidity	Sunshine	Score
January	-1°C	-7°C	58 mm	10	–	–	3.8
February	0°C	-6°C	52 mm	8	–	–	4.0
March	5°C	-3°C	56 mm	10	–	–	4.8
April	12°C	4°C	85 mm	11	–	–	6.0
May	19°C	10°C	85 mm	12	–	–	6.9
June	24°C	16°C	87 mm	11	–	–	7.6
July	27°C	19°C	71 mm	11	–	–	7.6
August	26°C	18°C	70 mm	10	–	–	7.7
September	22°C	14°C	72 mm	9	–	–	7.9
October	15°C	8°C	76 mm	11	–	–	6.5
November	8°C	2°C	66 mm	10	–	–	5.5
December	2°C	-3°C	56 mm	10	–	–	4.2