National Weather Service Forecast for: Johnstown CO
Issued by: National Weather Service Denver-Boulder, CO
Updated: 2:04 pm MDT Jun 9, 2025
 
This
Afternoon
This Afternoon: Sunny, with a high near 82. Northeast wind around 6 mph.
Sunny

 Tonight

Tonight: Clear, with a low around 52. East northeast wind around 6 mph becoming calm in the evening.
Clear

 Tuesday

Tuesday: Sunny, with a high near 89. Calm wind becoming southeast 5 to 7 mph in the afternoon.
Sunny

 Tuesday
Night
Tuesday Night: Partly cloudy, with a low around 56. Southeast wind 5 to 7 mph becoming west northwest after midnight.
Partly Cloudy

 Wednesday

Wednesday: A 30 percent chance of showers and thunderstorms after noon. Mostly sunny, with a high near 87. Light and variable wind becoming west northwest 5 to 9 mph in the morning. Winds could gust as high as 17 mph.
Mostly Sunny
then Chance
T-storms
 Wednesday
Night
Wednesday Night: A slight chance of showers and thunderstorms before 9pm, then a slight chance of showers between 9pm and midnight. Partly cloudy, with a low around 56. Chance of precipitation is 20%.
Slight Chance
T-storms then
Partly Cloudy
 Thursday

Thursday: A 20 percent chance of showers and thunderstorms after noon. Mostly sunny, with a high near 87.
Sunny then
Slight Chance
T-storms
 Thursday
Night
Thursday Night: A slight chance of showers and thunderstorms before midnight. Partly cloudy, with a low around 56.
Slight Chance
T-storms then
Mostly Clear
 Friday

Friday: A slight chance of showers and thunderstorms after noon. Mostly sunny, with a high near 88.
Sunny then
Slight Chance
T-storms
Hi 82 °F Lo 52 °F Hi 89 °F Lo 56 °F Hi 87 °F Lo 56 °F Hi 87 °F Lo 56 °F Hi 88 °F

Hazardous Weather Outlook
 

This Afternoon
 
 Sunny, with a high near 82. Northeast wind around 6 mph.
Tonight
 
 Clear, with a low around 52. East northeast wind around 6 mph becoming calm in the evening.
Tuesday
 
 Sunny, with a high near 89. Calm wind becoming southeast 5 to 7 mph in the afternoon.
Tuesday Night
 
 Partly cloudy, with a low around 56. Southeast wind 5 to 7 mph becoming west northwest after midnight.
Wednesday
 
 A 30 percent chance of showers and thunderstorms after noon. Mostly sunny, with a high near 87. Light and variable wind becoming west northwest 5 to 9 mph in the morning. Winds could gust as high as 17 mph.
Wednesday Night
 
 A slight chance of showers and thunderstorms before 9pm, then a slight chance of showers between 9pm and midnight. Partly cloudy, with a low around 56. Chance of precipitation is 20%.
Thursday
 
 A 20 percent chance of showers and thunderstorms after noon. Mostly sunny, with a high near 87.
Thursday Night
 
 A slight chance of showers and thunderstorms before midnight. Partly cloudy, with a low around 56.
Friday
 
 A slight chance of showers and thunderstorms after noon. Mostly sunny, with a high near 88.
Friday Night
 
 Partly cloudy, with a low around 57.
Saturday
 
 Mostly sunny, with a high near 91.
Saturday Night
 
 Partly cloudy, with a low around 58.
Sunday
 
 Mostly sunny, with a high near 92.

 

Forecast from NOAA-NWS for Johnstown CO.