Boulder Climate: Weather by Month and Best Time to Visit

Best months for Boulder: September, June.

Best time to visit

Year at a glance

Jan 4.7 Feb 4.7 Mar 5.5 Apr 5.9 May 6.2 Jun 7.2 Jul 7.1 Aug 7.1 Sep 7.8 Oct 6.9 Nov 5.6 Dec 4.7

Weather by month

Month	Avg high	Avg low	Rainfall	Rainy days	Humidity	Sunshine	Score
January	4°C	-9°C	23 mm	6	–	–	4.7
February	5°C	-9°C	26 mm	7	–	–	4.7
March	10°C	-5°C	50 mm	9	–	–	5.5
April	13°C	-1°C	77 mm	11	–	–	5.9
May	18°C	3°C	103 mm	16	–	–	6.2
June	24°C	8°C	77 mm	14	–	–	7.2
July	27°C	12°C	75 mm	15	–	–	7.1
August	26°C	11°C	71 mm	15	–	–	7.1
September	22°C	7°C	54 mm	10	–	–	7.8
October	16°C	1°C	47 mm	8	–	–	6.9
November	8°C	-5°C	33 mm	6	–	–	5.6
December	3°C	-9°C	23 mm	5	–	–	4.7