Dangerous Heat and Heavy Rainfall into the Weekend

Hot temperatures and high humidity are forecast to continue across the mid-Mississippi Valley into this weekend. Heat Advisories remain in effect. Heavy to excessive rainfall occurring at times through the weekend could bring areas of flooding to parts of the northern Rockies, upper Midwest, central Great Lakes, and southern New England. Read More >

Hazardous Weather Conditions

Flood Watch in effect from September 18, 06:00 PM MDT until September 19, 06:00 PM MDT

Current conditions at

Helena Regional Airport (KHLN)

Lat: 46.60445°NLon: 111.9892°WElev: 3874.0ft.

Overcast

70°F

21°C

Humidity	46%
Wind Speed	N 6 MPH
Barometer	30.08 in (1018.63 mb)
Dewpoint	48°F (9°C)
Visibility	10.00 mi
Last update	18 Sep 06:35 PM MDT

More Information:

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

Extended Forecast for

2 Miles NNW Helena MT

Flood Watch until September 19, 06:00pm

Click here for hazard details and duration

Flood Watch

Flood Watch until September 19, 06:00pm
NOW until 6:00pm Sat
Flood Watch
Tonight
Low: 51 °F
Showers
Saturday
High: 61 °F
Rain then
Showers
Likely
Saturday Night
Low: 47 °F
Chance Rain
Sunday
High: 73 °F
Mostly Sunny
Sunday Night
Low: 46 °F
Mostly Clear
Monday
High: 77 °F
Sunny
Monday Night
Low: 48 °F
Mostly Clear
Tuesday
High: 78 °F
Sunny

Detailed Forecast

Tonight

Showers and possibly a thunderstorm. Low around 51. West northwest wind 8 to 13 mph becoming light and variable. Winds could gust as high as 18 mph. Chance of precipitation is 100%. New rainfall amounts between 1 and 2 inches possible.

Saturday

Rain and possibly a thunderstorm before 3pm, then rain likely. High near 61. North northwest wind 3 to 7 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.

Saturday Night

A 30 percent chance of rain, mainly before 8pm. Mostly cloudy, with a low around 47. West northwest wind around 5 mph becoming calm in the evening.

Sunday

Mostly sunny, with a high near 73. Calm wind becoming east around 5 mph in the afternoon.

Sunday Night

Mostly clear, with a low around 46. Light and variable wind.

Monday

Sunny, with a high near 77. Calm wind becoming west southwest 5 to 7 mph in the afternoon.

Monday Night

Mostly clear, with a low around 48. West southwest wind 3 to 6 mph.

Tuesday

Sunny, with a high near 78. Calm wind becoming east around 5 mph in the afternoon.