Colorado · NWS BOU office

Longmont, CO weather

It is 38°F and clear at Vance Brand Airport as of Oct 28, 2:55 AM MDT. Overnight: Partly Cloudy, low near 38°F. Forecast from the National Weather Service, issued Oct 28, 12:46 AM MDT.

Updated Oct 28, 3:16 AM MDT (snapshot)

Current conditions

Temperature

38°F

Clear · feels like 35°F

Wind

W 3 mph

Humidity 84% · dew point 33°F

Pressure · visibility

29.97 inHg

Visibility 7 mi

Observed at Vance Brand Airport (KLMO), Oct 28, 2:55 AM MDT. Station readings can lag or be missing.

Alerts for this area

No active NWS alerts cover the Longmont forecast zone right now.

Around the NWS BOU forecast area

No active alerts in zones served by the BOU office near Longmont.

From the alert snapshot of Oct 28, 2026, 5:12 AM EDT. Colorado has 3 active alerts: see them all.

For official warnings, check weather.gov and your local authorities. OpenForecast repeats National Weather Service alerts and may be delayed or incomplete. Follow instructions from emergency officials.

Next 24 hours

Hourly forecast for Longmont (local time)
TimeTempForecastPrecip. chanceWind
Wed 5 AM38°FMostly Cloudy0%WSW 2 mph
Wed 6 AM38°FMostly Cloudy0%SW 2 mph
Wed 7 AM38°FCloudy0%SW 1 mph
Wed 8 AM39°FMostly Cloudy0%WNW 1 mph
Wed 9 AM44°FPartly Sunny0%NW 2 mph
Wed 10 AM51°FMostly Sunny0%NW 1 mph
Wed 11 AM57°FMostly Sunny0%NE 1 mph
Wed 12 PM64°FMostly Sunny0%E 2 mph
Wed 1 PM66°FMostly Sunny0%SSE 3 mph
Wed 2 PM67°FMostly Sunny0%SSE 6 mph
Wed 3 PM69°FMostly Sunny0%SE 8 mph
Wed 4 PM67°FMostly Sunny0%SSE 7 mph
Wed 5 PM66°FMostly Sunny0%SE 5 mph
Wed 6 PM62°FPartly Cloudy0%ESE 3 mph
Wed 7 PM56°FPartly Cloudy0%SSE 3 mph
Wed 8 PM53°FPartly Cloudy0%WNW 2 mph
Wed 9 PM51°FPartly Cloudy0%WNW 2 mph
Wed 10 PM48°FPartly Cloudy0%NW 2 mph
Wed 11 PM46°FPartly Cloudy0%NW 2 mph
Thu 12 AM44°FPartly Cloudy0%NNW 2 mph
Thu 1 AM43°FMostly Cloudy0%N 2 mph
Thu 2 AM41°FMostly Clear0%NNW 2 mph
Thu 3 AM40°FMostly Clear0%NW 2 mph
Thu 4 AM39°FMostly Clear0%WNW 2 mph

Hourly values come from the NWS gridded forecast for the 2.5 km grid square that covers the city's center point. Conditions elsewhere in Longmont can differ.

7-day forecast

Overnight

Low 38°F

Partly cloudy, with a low around 38. West southwest wind around 2 mph.

Wednesday

High 69°F·Low 37°F

Mostly sunny. High near 69, with temperatures falling to around 66 in the afternoon. Southeast wind 1 to 8 mph.

Wednesday Night: Partly cloudy, with a low around 37. Northwest wind around 3 mph.

Thursday

High 67°F·Low 39°F

Mostly sunny, with a high near 67. Southeast wind around 3 mph.

Thursday Night: Partly cloudy, with a low around 39. North northwest wind 0 to 3 mph.

Friday

High 64°F·Low 41°F

Partly sunny, with a high near 64.

Friday Night: Mostly cloudy, with a low around 41.

Saturday

High 63°F·Low 41°F

Mostly sunny, with a high near 63.

Saturday Night: Partly cloudy, with a low around 41.

Sunday

High 59°F·Low 43°F

A chance of rain showers after 11am. Mostly cloudy, with a high near 59.

Sunday Night: Rain showers likely. Mostly cloudy, with a low around 43.

Monday

High 54°F·Low 39°F

Rain showers likely. Mostly cloudy, with a high near 54.

Monday Night: A chance of rain showers. Mostly cloudy, with a low around 39.

Tuesday

High 55°F

A slight chance of rain showers before 5pm. Mostly sunny, with a high near 55.

Nearby cities

Larger cities in the area

Other cities in Boulder County

See every city we cover in Colorado, or check all active alerts.

About this forecast

Forecast office
Longmont is served by the National Weather Service BOU forecast office, forecast zone COZ039, county zone COC013.
Location used
The Census Bureau's internal point for Longmont (40.1682, -105.1005), in Boulder County. Population: 99,818 (2024 estimate), number 13 of the 33 Colorado cities on this site.
Radar
Nearest NWS radar: KFTG. View it on radar.weather.gov.

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Sources

  • Forecast, hourly forecast, observations and alerts: National Weather Service API, api.weather.gov/points/40.1682,-105.1005 (forecast issued Oct 28, 12:46 AM MDT).
  • Official forecast page: forecast.weather.gov.
  • City location and population: U.S. Census Bureau, Vintage 2024 population estimates and 2024 Gazetteer files.
  • Snapshot taken Oct 28, 2026. The NWS and Census Bureau do not endorse OpenForecast.

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