National Weather Service Forecast for: Johnstown CO
Issued by: National Weather Service Denver-Boulder, CO
Updated: 12:46 pm MDT May 26, 2026
 
This
Afternoon
This Afternoon: A 20 percent chance of showers and thunderstorms after 3pm. Partly sunny, with a high near 83. Windy, with a south southeast wind 22 to 25 mph, with gusts as high as 38 mph.
Slight Chance
T-storms and
Windy

 Tonight

Tonight: A slight chance of showers and thunderstorms before 9pm, then a chance of showers between 9pm and midnight. Mostly cloudy, with a low around 54. Breezy, with a south southeast wind 15 to 20 mph becoming light and variable after midnight. Winds could gust as high as 31 mph. Chance of precipitation is 30%.
Chance
Showers and
Breezy then
Mostly Cloudy
 Wednesday

Wednesday: A slight chance of showers between 11am and noon, then a chance of showers and thunderstorms after noon. Mostly cloudy, with a high near 76. Breezy, with a light and variable wind becoming southeast 10 to 15 mph in the morning. Winds could gust as high as 24 mph. Chance of precipitation is 50%.
Slight Chance
Showers then
Chance
T-storms and
Breezy
 Wednesday
Night
Wednesday Night: A 40 percent chance of showers and thunderstorms, mainly before 9pm. Mostly cloudy, with a low around 53. South southeast wind 6 to 11 mph becoming light and variable after midnight. Winds could gust as high as 18 mph.
Chance
T-storms then
Mostly Cloudy

 Thursday

Thursday: A 30 percent chance of showers and thunderstorms after noon. Partly sunny, with a high near 80. Light and variable wind becoming southeast 8 to 13 mph in the morning. Winds could gust as high as 23 mph.
Mostly Cloudy
then Chance
T-storms

 Thursday
Night
Thursday Night: A 40 percent chance of showers and thunderstorms before midnight. Mostly cloudy, with a low around 53.
Chance
T-storms then
Partly Cloudy

 Friday

Friday: A 40 percent chance of showers and thunderstorms after noon. Partly sunny, with a high near 83.
Mostly Sunny
then Chance
T-storms

 Friday
Night
Friday Night: A chance of showers and thunderstorms before midnight. Mostly cloudy, with a low around 53.
Chance
T-storms then
Mostly Cloudy

 Saturday

Saturday: A chance of showers and thunderstorms after noon. Partly sunny, with a high near 81.
Mostly Sunny
then Chance
T-storms
Hi 83 °F Lo 54 °F Hi 76 °F Lo 53 °F Hi 80 °F Lo 53 °F Hi 83 °F Lo 53 °F Hi 81 °F

 

This Afternoon
 
 A 20 percent chance of showers and thunderstorms after 3pm. Partly sunny, with a high near 83. Windy, with a south southeast wind 22 to 25 mph, with gusts as high as 38 mph.
Tonight
 
 A slight chance of showers and thunderstorms before 9pm, then a chance of showers between 9pm and midnight. Mostly cloudy, with a low around 54. Breezy, with a south southeast wind 15 to 20 mph becoming light and variable after midnight. Winds could gust as high as 31 mph. Chance of precipitation is 30%.
Wednesday
 
 A slight chance of showers between 11am and noon, then a chance of showers and thunderstorms after noon. Mostly cloudy, with a high near 76. Breezy, with a light and variable wind becoming southeast 10 to 15 mph in the morning. Winds could gust as high as 24 mph. Chance of precipitation is 50%.
Wednesday Night
 
 A 40 percent chance of showers and thunderstorms, mainly before 9pm. Mostly cloudy, with a low around 53. South southeast wind 6 to 11 mph becoming light and variable after midnight. Winds could gust as high as 18 mph.
Thursday
 
 A 30 percent chance of showers and thunderstorms after noon. Partly sunny, with a high near 80. Light and variable wind becoming southeast 8 to 13 mph in the morning. Winds could gust as high as 23 mph.
Thursday Night
 
 A 40 percent chance of showers and thunderstorms before midnight. Mostly cloudy, with a low around 53.
Friday
 
 A 40 percent chance of showers and thunderstorms after noon. Partly sunny, with a high near 83.
Friday Night
 
 A chance of showers and thunderstorms before midnight. Mostly cloudy, with a low around 53.
Saturday
 
 A chance of showers and thunderstorms after noon. Partly sunny, with a high near 81.
Saturday Night
 
 A chance of showers and thunderstorms before midnight, then a slight chance of showers. Partly cloudy, with a low around 51.
Sunday
 
 A chance of showers and thunderstorms. Mostly sunny, with a high near 81.
Sunday Night
 
 A chance of showers and thunderstorms. Mostly cloudy, with a low around 51.
Monday
 
 A chance of showers and thunderstorms. Partly sunny, with a high near 80.

 

Forecast from NOAA-NWS for Johnstown CO.