You can expect about 3 to 8 days of rain in Longmont during the month of May. It’s a good idea to bring along your umbrella so that you don’t get caught in poor weather.

Please note that Longmont can expect a few days of snow in May.

Our weather forecast can give you a great sense of what weather to expect in Longmont in May 2026.

If you’re planning to visit Longmont in the near future, we highly recommend that you review the 14 day weather forecast for Longmont before you arrive.

Temperatures

21° / 7°

Rainy Days

Snowy Days

Dry Days

Rainfall

103

Sun Hours

11.1

Hrs

Sun	Mon	Tue	Wed	Thu	Fri	Sat
					1 18° /6°	2 17° /4°
3 18° /3°	4 20° /5°	5 17° /5°	6 4° /-2°	7 19° /-2°	8 22° /4°	9 24° /8°
10 21° /4°	11 29° /8°	12 32° /13°	13 29° /14°	14 22° /8°	15 26° /9°	16 27° /12°
17 26° /12°	18 29° /11°	19 31° /12°	20 19° /6°	21 18° /6°	22 20° /6°	23 23° /8°
24 18° /7°	25 21° /8°	26 22° /9°	27 25° /10°	28 25° /11°	29 23° /10°	30 24° /9°
31 21° /8°

Explore the weather in Longmont in other months

Longmont annual weather

Month	Temperatures	Rainy Days	Dry Days	Snowy Days	Rainfall	Weather	More details
January	6° / -4°	2	20	8	21 mm	Awful	Longmont in January
February	6° / -5°	3	15	11	35 mm	Awful	Longmont in February
March	12° / 0°	3	21	7	56 mm	Bad	Longmont in March
April	16° / 3°	4	21	6	64 mm	Ok	Longmont in April
May	21° / 7°	7	22	2	103 mm	Bad	Longmont in May
June	30° / 14°	3	27	0	44 mm	Good	Longmont in June
July	32° / 17°	3	28	0	60 mm	Good	Longmont in July
August	32° / 16°	1	30	0	35 mm	Good	Longmont in August
September	28° / 13°	2	28	0	35 mm	Perfect	Longmont in September
October	18° / 5°	2	26	3	33 mm	Ok	Longmont in October
November	12° / 0°	2	23	5	23 mm	Bad	Longmont in November
December	6° / -5°	2	21	7	19 mm	Awful	Longmont in December