Excessive Rainfall and Tropical Storm in the South; Severe Thunderstorms in the Midwest

Excessive rainfall may produce considerable, potentially life-threatening, flooding across the lower Mississippi River Valley and central Great Lakes region through tonight. Tropical Storm Arthur will move northeastward along the Texas coast today and then move inland over southwestern Louisiana by tonight. An outbreak of severe thunderstorms is expected across portions of Illinois and Indiana. Read More >

Hazardous Weather Conditions

Air Quality Alert

Current conditions at

Vance Brand Airport (KLMO)

Lat: 40.16°NLon: 105.16°WElev: 5039ft.

Fair

91°F

33°C

Humidity	17%
Wind Speed	SE 7 mph
Barometer	29.73 in
Dewpoint	40°F (4°C)
Visibility	10.00 mi
Heat Index	87°F (31°C)
Last update	17 Jun 4:15 pm MDT

More Information:

Local Forecast Office More Local Wx 3 Day History Hourly Weather Forecast

Extended Forecast for

Longmont CO

Tonight
Low: 54 °F
Mostly Clear
and Breezy
then Mostly
Clear
Thursday
High: 89 °F
Sunny
Thursday Night
Low: 57 °F
Increasing
Clouds
Juneteenth
High: 90 °F
Gradual
Clearing
Friday Night
Low: 58 °F
Mostly Clear
Saturday
High: 96 °F
Mostly Sunny
then Mostly
Sunny and
Breezy
Saturday Night
Low: 58 °F
Mostly Clear
and Breezy
then Mostly
Clear
Sunday
High: 90 °F
Sunny then
Slight Chance
T-storms
Sunday Night
Low: 55 °F
Chance
T-storms then
Partly Cloudy

Detailed Forecast

Tonight

Mostly clear, with a low around 54. Breezy, with a northwest wind 10 to 15 mph becoming light and variable after midnight. Winds could gust as high as 24 mph.

Thursday

Sunny, with a high near 89. Calm wind becoming east northeast 5 to 8 mph in the morning.

Thursday Night

Increasing clouds, with a low around 57. East wind 5 to 8 mph becoming northwest in the evening. Winds could gust as high as 16 mph.

Juneteenth

Cloudy through mid morning, then gradual clearing, with a high near 90. North wind 6 to 9 mph becoming east in the afternoon. Winds could gust as high as 18 mph.

Friday Night

Mostly clear, with a low around 58. East wind 5 to 7 mph becoming calm in the evening. Winds could gust as high as 15 mph.

Saturday

Mostly sunny, with a high near 96. Breezy.

Saturday Night

Mostly clear, with a low around 58. Breezy.

Sunday

A slight chance of showers and thunderstorms after noon. Mostly sunny, with a high near 90.

Sunday Night

A chance of showers and thunderstorms before midnight. Mostly cloudy, with a low around 55.

Monday

A chance of showers and thunderstorms after noon. Mostly sunny, with a high near 85.