National Weather Service Forecast for: Johnstown CO
Issued by: National Weather Service Denver-Boulder, CO
Updated: 11:47 am MST Nov 1, 2026
 
Tonight

Tonight: A slight chance of rain before 11pm, then a chance of rain after 2am. Mostly cloudy, with a low around 45. Northwest wind around 5 mph becoming light and variable after midnight. Chance of precipitation is 30%.
Chance Rain

 Monday

Monday: Rain likely, mainly between 8am and 11am. Mostly cloudy, with a high near 55. Breezy, with a north northwest wind 6 to 11 mph increasing to 18 to 23 mph in the afternoon. Winds could gust as high as 38 mph. Chance of precipitation is 60%.
Rain Likely
and Breezy

 Monday
Night
Monday Night: A 20 percent chance of rain before 11pm. Cloudy, then gradually becoming partly cloudy, with a low around 42. Breezy, with a north northwest wind 15 to 22 mph, with gusts as high as 41 mph.
Breezy.
Slight Chance
Rain then
Partly Cloudy
 Tuesday

Tuesday: Sunny, with a high near 60. Northwest wind 5 to 9 mph becoming light and variable in the afternoon. Winds could gust as high as 17 mph.
Sunny

 Tuesday
Night
Tuesday Night: Mostly clear, with a low around 36. Light and variable wind.
Mostly Clear

 Wednesday

Wednesday: Mostly sunny, with a high near 55.
Mostly Sunny

 Wednesday
Night
Wednesday Night: A 20 percent chance of showers before 11pm. Mostly cloudy, with a low around 36.
Slight Chance
Showers then
Mostly Cloudy
 Thursday

Thursday: Sunny, with a high near 56.
Sunny

 Thursday
Night
Thursday Night: Partly cloudy, with a low around 35.
Partly Cloudy
Lo 45 °F Hi 55 °F Lo 42 °F Hi 60 °F Lo 36 °F Hi 55 °F Lo 36 °F Hi 56 °F Lo 35 °F

 

Tonight
 
 A slight chance of rain before 11pm, then a chance of rain after 2am. Mostly cloudy, with a low around 45. Northwest wind around 5 mph becoming light and variable after midnight. Chance of precipitation is 30%.
Monday
 
 Rain likely, mainly between 8am and 11am. Mostly cloudy, with a high near 55. Breezy, with a north northwest wind 6 to 11 mph increasing to 18 to 23 mph in the afternoon. Winds could gust as high as 38 mph. Chance of precipitation is 60%.
Monday Night
 
 A 20 percent chance of rain before 11pm. Cloudy, then gradually becoming partly cloudy, with a low around 42. Breezy, with a north northwest wind 15 to 22 mph, with gusts as high as 41 mph.
Tuesday
 
 Sunny, with a high near 60. Northwest wind 5 to 9 mph becoming light and variable in the afternoon. Winds could gust as high as 17 mph.
Tuesday Night
 
 Mostly clear, with a low around 36. Light and variable wind.
Wednesday
 
 Mostly sunny, with a high near 55.
Wednesday Night
 
 A 20 percent chance of showers before 11pm. Mostly cloudy, with a low around 36.
Thursday
 
 Sunny, with a high near 56.
Thursday Night
 
 Partly cloudy, with a low around 35.
Friday
 
 Mostly sunny, with a high near 57.
Friday Night
 
 Partly cloudy, with a low around 36.
Saturday
 
 Mostly sunny, with a high near 55.
Saturday Night
 
 Partly cloudy, with a low around 34.
Sunday
 
 Sunny, with a high near 59.

 

Forecast from NOAA-NWS for Johnstown CO.