| National Weather Service Forecast for:
Johnstown CO Issued by: National Weather Service Denver-Boulder, CO |
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| Updated: 12:46 pm MDT Sep 12, 2026 | ||||||||||||||||||
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| Tonight |
Mostly clear, with a low around 55. North northwest wind 3 to 5 mph. |
| Sunday |
A chance of showers, with thunderstorms also possible after 3pm. Increasing clouds, with a high near 92. Light and variable wind becoming southeast 6 to 11 mph in the afternoon. Winds could gust as high as 18 mph. Chance of precipitation is 30%. |
| Sunday Night |
A slight chance of showers and thunderstorms. Mostly cloudy, with a low around 60. West southwest wind 5 to 9 mph becoming east northeast in the evening. Winds could gust as high as 15 mph. Chance of precipitation is 20%. |
| Monday |
A slight chance of showers between noon and 3pm, then a slight chance of showers and thunderstorms after 3pm. Partly sunny, with a high near 87. Calm wind becoming southwest 5 to 7 mph in the afternoon. Chance of precipitation is 20%. |
| Monday Night |
A 30 percent chance of showers, mainly after midnight. Mostly cloudy, with a low around 54. North wind 5 to 11 mph, with gusts as high as 18 mph. |
| Tuesday |
A slight chance of showers, then a chance of showers and thunderstorms after noon. Partly sunny, with a high near 74. Chance of precipitation is 40%. |
| Tuesday Night |
A 40 percent chance of showers and thunderstorms before midnight. Mostly cloudy, with a low around 53. |
| Wednesday |
A slight chance of showers and thunderstorms after noon. Mostly sunny, with a high near 82. |
| Wednesday Night |
A chance of showers and thunderstorms before midnight, then a slight chance of showers. Mostly cloudy, with a low around 54. |
| Thursday |
A chance of showers, with thunderstorms also possible after noon. Partly sunny, with a high near 75. |
| Thursday Night |
A chance of showers. Mostly cloudy, with a low around 52. |
| Friday |
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 79. |
| Friday Night |
A slight chance of showers. Partly cloudy, with a low around 51. |
| Saturday |
Mostly sunny, with a high near 78. |
Forecast from NOAA-NWS for Johnstown CO.