National Weather Service Forecast for: Johnstown CO
Issued by: National Weather Service Denver-Boulder, CO
Updated: 12:47 pm MDT Apr 6, 2026
 
This
Afternoon
This Afternoon: Mostly sunny, with a high near 70. Breezy, with an east wind 9 to 16 mph, with gusts as high as 23 mph.
Mostly Sunny
and Breezy

Tonight

Tonight: Mostly cloudy, with a low around 34. Breezy, with an east wind 12 to 17 mph becoming light  after midnight. Winds could gust as high as 26 mph.
Mostly Cloudy
and Breezy
then Mostly
Cloudy
Tuesday

Tuesday: A 20 percent chance of showers after 3pm.  Mostly cloudy, then gradually becoming sunny, with a high near 71. Light east wind becoming south southeast 5 to 10 mph in the afternoon. Winds could gust as high as 15 mph.
Partly Sunny
then Slight
Chance
Showers
Tuesday
Night
Tuesday Night: A 20 percent chance of showers before midnight.  Partly cloudy, with a low around 39. South wind 6 to 9 mph becoming west after midnight. Winds could gust as high as 17 mph.
Slight Chance
Showers then
Partly Cloudy
Wednesday

Wednesday: Mostly sunny, with a high near 72. Breezy, with a west wind 6 to 15 mph becoming east northeast in the afternoon. Winds could gust as high as 26 mph.
Sunny then
Mostly Sunny
and Breezy
Wednesday
Night
Wednesday Night: A 20 percent chance of showers before midnight.  Partly cloudy, with a low around 37.
Slight Chance
Showers then
Partly Cloudy
Thursday

Thursday: A 30 percent chance of showers after noon.  Partly sunny, with a high near 72.
Mostly Sunny
then Chance
Showers
Thursday
Night
Thursday Night: A chance of showers before midnight.  Mostly cloudy, with a low around 41.
Chance
Showers then
Partly Cloudy
Friday

Friday: A chance of showers after noon.  Mostly cloudy, with a high near 70.
Mostly Cloudy
then Chance
Showers
Hi 70 °F Lo 34 °F Hi 71 °F Lo 39 °F Hi 72 °F Lo 37 °F Hi 72 °F Lo 41 °F Hi 70 °F

Hazardous Weather Outlook
 

This Afternoon
 
Mostly sunny, with a high near 70. Breezy, with an east wind 9 to 16 mph, with gusts as high as 23 mph.
Tonight
 
Mostly cloudy, with a low around 34. Breezy, with an east wind 12 to 17 mph becoming light after midnight. Winds could gust as high as 26 mph.
Tuesday
 
A 20 percent chance of showers after 3pm. Mostly cloudy, then gradually becoming sunny, with a high near 71. Light east wind becoming south southeast 5 to 10 mph in the afternoon. Winds could gust as high as 15 mph.
Tuesday Night
 
A 20 percent chance of showers before midnight. Partly cloudy, with a low around 39. South wind 6 to 9 mph becoming west after midnight. Winds could gust as high as 17 mph.
Wednesday
 
Mostly sunny, with a high near 72. Breezy, with a west wind 6 to 15 mph becoming east northeast in the afternoon. Winds could gust as high as 26 mph.
Wednesday Night
 
A 20 percent chance of showers before midnight. Partly cloudy, with a low around 37.
Thursday
 
A 30 percent chance of showers after noon. Partly sunny, with a high near 72.
Thursday Night
 
A chance of showers before midnight. Mostly cloudy, with a low around 41.
Friday
 
A chance of showers after noon. Mostly cloudy, with a high near 70.
Friday Night
 
A chance of showers, mainly before midnight. Mostly cloudy, with a low around 42.
Saturday
 
A chance of showers. Mostly cloudy, with a high near 75.
Saturday Night
 
A chance of showers. Mostly cloudy, with a low around 43.
Sunday
 
A chance of showers. Partly sunny, with a high near 73.

 

Forecast from NOAA-NWS for Johnstown CO.