See exactly when rain will start and stop with a minute-by-minute precipitation nowcast for the next hour.
12°
Overcast
Feels Like: 12°
Min: 11°
Max: 29°
The next few hours will be overcast, with today reaching 29°C and dropping to 16°C. The coming days will be mostly clear throughout the day.
Compare today's weather with yesterday's data and track temperature trends over time.
Hourly Forecast
Daylight Hours
06:48
Sunrise
19:00
Sunset
Moon
Waxing Crescent
12:43
Moonrise
21:10
Moonset
Daily Forecast
Today
Thursday
Friday
Saturday
Sunday
Monday
Tuesday
Wednesday
Thursday
Friday
Air Quality Data Available
Upgrade to access real-time air quality data for Longmont.
UV Index
Humidity
Weather in Longmont today, September 16, 2026
Longmont stays under cloudy skies on September 16, 2026, with only brief brighter breaks. Plan for a day that feels grey more often than open. Cloud leads the morning, peaking close to 100% near 05:00. Sunshine has little room until later in the day.
The temperature range runs from about 11°C up to 29°C. Expect humidity between 24% and 84%, most humid near 20:00. Airflow remains manageable, reaching about 5.5 km/h around 19:00.
Through the afternoon cloud remains the main feature, with cover near 100% around 12:00. Bright spells should stay limited even as the day wears on. Horizontal visibility sits around 15.4 km, briefly nearer 7.5 km. Daylight runs from 06:48 to 19:00, lasting 12 hours 12 minutes of sunlight today.
In short, cloud leads the story in Longmont on September 16, 2026; expect limited sun and a peak around 29°C.
Frequently asked questions about weather in Longmont
How warm does it get in Longmont?
The warmest month in Longmont is July, with average high temperatures of 32°C. The average temperature during this period is around 23°C.
How cold does it get in Longmont?
The coldest month in Longmont is January, with average low temperatures of -7°C. The average temperature during this period is around -2°C.
What is the wettest time of year in Longmont?
The wettest month in Longmont is May, with an average of 107mm of precipitation.
What is the driest time of year in Longmont?
The driest month in Longmont is December, with an average of 18mm of precipitation.
Explore more weather forecasts
- Erie, Colorado
- New York City, New York
- Firestone, Colorado
- Los Angeles, California
- Frederick, Colorado
- Brooklyn, New York
- Lafayette, Colorado
- Chicago, Illinois
- Louisville, Colorado
- Houston, Texas
- Boulder, Colorado
- Queens, New York
- Superior, Colorado
- Phoenix, Arizona
- Johnstown, Colorado
- Philadelphia, Pennsylvania
