Weather & Climate 

Longmont, Colorado, enjoys a semi-arid climate with over 300 days of sunshine annually, making it an ideal year-round destination for outdoor enthusiasts. Summers are warm and dry, with average highs in the upper 80s°F (around 30°C), while winters are cool, often bringing snow and crisp mountain air. The proximity to the Rockies keeps the weather dynamic, with afternoon thunderstorms common in late summer. Thanks to the abundant sunshine, even winter days can be mild and pleasant, primarily when the sun reflects off the snow, offering bright and inviting conditions.

Average Temps

Month

High/Low

Precipitation (Inches)

January

45°/14°

0.56

February

47°/17°

0.57

March

57°/26°

1.17

April

63°/32°

2.04

May

73°/41°

1.97

June

84°/51°

1.75

July

91°/55°

1.69

August

88°/54°

1.95

September

80°/46°

1.26

October

66°/33°

1.04

November

54°/24°

0.75

December

45°/15°

0.46


Source: NOAA

Order a Visitors Guide

Sign up here to receive a physical copy of our brand new 2024-2025 Visitor's Guide.

Request Guide

Subscribe

Keep up-to-date with Longmont area happenings, news, events, itineraries, things to do and more.

Sign Up