Dumbarton Climate: Weather by Month and Best Time to Visit

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

Best time to visit

Year at a glance

Jan 3.8 Feb 4.3 Mar 4.7 Apr 5.3 May 5.8 Jun 6.1 Jul 6.1 Aug 5.9 Sep 6.0 Oct 5.0 Nov 4.5 Dec 4.0

Weather by month

Month	Avg high	Avg low	Rainfall	Rainy days	Humidity	Sunshine	Score
January	6°C	2°C	148 mm	18	–	–	3.8
February	7°C	2°C	121 mm	16	–	–	4.3
March	8°C	3°C	106 mm	16	–	–	4.7
April	11°C	4°C	84 mm	14	–	–	5.3
May	14°C	6°C	86 mm	15	–	–	5.8
June	16°C	9°C	90 mm	15	–	–	6.1
July	18°C	11°C	102 mm	16	–	–	6.1
August	17°C	11°C	113 mm	17	–	–	5.9
September	15°C	9°C	101 mm	14	–	–	6.0
October	12°C	7°C	142 mm	16	–	–	5.0
November	9°C	4°C	132 mm	17	–	–	4.5
December	6°C	2°C	142 mm	17	–	–	4.0