Longmont, CO Weather Forecast
Local 7-day forecast
Chance Showers And Thunderstorms
Track current conditions, temperature changes, wind, and the full daily outlook for Longmont, CO in one place.
A chance of showers and thunderstorms. Partly sunny. High near 87, with temperatures falling to around 82 in the afternoon. North northeast wind around 7 mph. Chance of precipitation is 40%. New rainfall amounts less than a tenth of an inch possible.
Local Weather Overview
This forecast page for Longmont, CO is designed for quick trip planning, giving you a clean read on daytime highs, overnight lows, and changing conditions across the upcoming forecast window. Latest sync: Aug 25, 2026 6:27 PM MDT.
The active forecast window currently covers Aug 25 to Aug 31, 2026 for Longmont, CO.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Aug 25 to Aug 31, 2026
- Latest sync
- Aug 25, 2026 6:27 PM MDT
- Forecast office
- BOU
- Source
- NOAA / NWS
Daily Outlook
This Week in Longmont
Saturday looks like the warmest upcoming period in Longmont at 95 degrees F.
Wednesday Night is the coolest period ahead with temperatures near 58 degrees F.
The strongest winds are forecast for Saturday at about 3 to 9 mph W.
Precipitation is mentioned in 8 upcoming forecast periods.
Forecast Details
- Last updated
- Aug 25, 2026 6:27 PM MDT
- Coverage
- 8 days
- Time zone
- America/Denver
- Forecast office
- BOU
- Radar station
- KFTG
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
A chance of showers and thunderstorms before 9pm. Partly cloudy, with a low around 59. Northwest wind around 6 mph. Chance of precipitation is 30%.
A chance of showers and thunderstorms after noon. Mostly sunny. High near 86, with temperatures falling to around 84 in the afternoon. East northeast wind 2 to 6 mph. Chance of precipitation is 40%.
A slight chance of showers and thunderstorms before 9pm. Partly cloudy, with a low around 58. West northwest wind 1 to 6 mph. Chance of precipitation is 20%.
A slight chance of showers and thunderstorms after noon. Mostly sunny, with a high near 89. East northeast wind 1 to 5 mph. Chance of precipitation is 20%.
Partly cloudy, with a low around 61.
Mostly sunny, with a high near 94.
Mostly cloudy, with a low around 62.
Mostly sunny, with a high near 95.
Mostly cloudy, with a low around 62.
A chance of showers and thunderstorms after noon. Partly sunny, with a high near 89.
A slight chance of showers and thunderstorms before midnight. Mostly cloudy, with a low around 58.
A chance of showers and thunderstorms after noon. Partly sunny, with a high near 87.
Mostly cloudy, with a low around 58.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
This Afternoon
Aug 25
|
Chance Showers And Thunderstorms
|
87°F |
7 mph
NNE
|
|
Tonight
Aug 25
|
Chance Showers And Thunderstorms then Partly Cloudy
|
59°F |
6 mph
NW
|
|
Wednesday
Aug 26
|
Mostly Sunny then Chance Showers And Thunderstorms
|
86°F |
2 to 6 mph
ENE
|
|
Wednesday Night
Aug 26
|
Slight Chance Showers And Thunderstorms then Partly Cloudy
|
58°F |
1 to 6 mph
WNW
|
|
Thursday
Aug 27
|
Mostly Sunny then Slight Chance Showers And Thunderstorms
|
89°F |
1 to 5 mph
ENE
|
|
Thursday Night
Aug 27
|
Partly Cloudy
|
61°F |
5 mph
SW
|
|
Friday
Aug 28
|
Mostly Sunny
|
94°F |
1 to 5 mph
WNW
|
|
Friday Night
Aug 28
|
Mostly Cloudy
|
62°F |
5 mph
W
|
|
Saturday
Aug 29
|
Mostly Sunny
|
95°F |
3 to 9 mph
W
|
|
Saturday Night
Aug 29
|
Mostly Cloudy
|
62°F |
2 to 8 mph
W
|
|
Sunday
Aug 30
|
Partly Sunny then Chance Showers And Thunderstorms
|
89°F |
2 to 7 mph
WSW
|
|
Sunday Night
Aug 30
|
Slight Chance Showers And Thunderstorms then Mostly Cloudy
|
58°F |
2 to 6 mph
WNW
|
|
Monday
Aug 31
|
Partly Sunny then Chance Showers And Thunderstorms
|
87°F |
2 to 6 mph
E
|
|
Monday Night
Aug 31
|
Mostly Cloudy
|
58°F |
2 to 6 mph
SW
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Longmont.
