Colorado · NWS BOU office

Johnstown, CO weather

It is 39°F and clear at Fort Collins/Loveland - Northern Colorado Regional Airport as of Oct 28, 6:00 AM MDT. Today: Patchy Fog then Partly Sunny, high near 69°F. Forecast from the National Weather Service, issued Oct 28, 4:06 AM MDT.

Updated Oct 28, 6:32 AM MDT (snapshot)

Current conditions

Temperature

39°F

Clear

Wind

Calm

Humidity 93% · dew point 37°F

Pressure · visibility

29.97 inHg

Visibility 8 mi

Observed at Fort Collins/Loveland - Northern Colorado Regional Airport (KFNL), Oct 28, 6:00 AM MDT. Station readings can lag or be missing.

Alerts for this area

No active NWS alerts cover the Johnstown forecast zone right now.

Around the NWS BOU forecast area

No active alerts in zones served by the BOU office near Johnstown.

From the alert snapshot of Oct 28, 2026, 8:14 AM EDT. Colorado has 4 active alerts: see them all.

For official warnings, check weather.gov and your local authorities. OpenForecast repeats National Weather Service alerts and may be delayed or incomplete. Follow instructions from emergency officials.

Next 24 hours

Hourly forecast for Johnstown (local time)
TimeTempForecastPrecip. chanceWind
Wed 6 AM36°FPatchy Fog0%WSW 2 mph
Wed 7 AM36°FMostly Cloudy0%WSW 2 mph
Wed 8 AM38°FMostly Cloudy0%W 2 mph
Wed 9 AM42°FMostly Cloudy0%W 3 mph
Wed 10 AM49°FPartly Sunny0%NNW 2 mph
Wed 11 AM56°FMostly Sunny0%N 2 mph
Wed 12 PM62°FMostly Sunny0%ENE 2 mph
Wed 1 PM65°FSunny0%E 3 mph
Wed 2 PM67°FSunny0%SE 6 mph
Wed 3 PM69°FMostly Sunny0%SE 7 mph
Wed 4 PM67°FSunny0%SE 8 mph
Wed 5 PM65°FMostly Sunny0%SE 7 mph
Wed 6 PM61°FPartly Cloudy0%ESE 7 mph
Wed 7 PM54°FPartly Cloudy0%ESE 6 mph
Wed 8 PM51°FPartly Cloudy0%S 3 mph
Wed 9 PM49°FPartly Cloudy0%W 2 mph
Wed 10 PM48°FPartly Cloudy0%NW 2 mph
Wed 11 PM45°FPartly Cloudy0%N 3 mph
Thu 12 AM44°FPartly Cloudy0%N 5 mph
Thu 1 AM42°FPartly Cloudy0%N 3 mph
Thu 2 AM40°FPartly Cloudy0%NW 3 mph
Thu 3 AM39°FMostly Clear0%NW 3 mph
Thu 4 AM38°FMostly Clear0%NW 3 mph
Thu 5 AM38°FMostly Clear0%NW 3 mph

Hourly values come from the NWS gridded forecast for the 2.5 km grid square that covers the city's center point. Conditions elsewhere in Johnstown can differ.

7-day forecast

Today

High 69°F·Low 36°F

Patchy fog before 7am. Partly sunny. High near 69, with temperatures falling to around 65 in the afternoon. South wind 2 to 8 mph.

Tonight: Partly cloudy. Low around 36, with temperatures rising to around 38 overnight. Northwest wind 2 to 7 mph.

Thursday

High 66°F·Low 37°F

Mostly sunny. High near 66, with temperatures falling to around 64 in the afternoon. North northwest wind around 3 mph.

Thursday Night: Partly cloudy, with a low around 37. North wind around 3 mph.

Friday

High 62°F·Low 40°F

Partly sunny, with a high near 62. North northeast wind around 5 mph.

Friday Night: Mostly cloudy, with a low around 40.

Saturday

High 62°F·Low 40°F

Mostly sunny, with a high near 62.

Saturday Night: Partly cloudy, with a low around 40.

Sunday

High 59°F·Low 42°F

A chance of rain showers after 5pm. Mostly cloudy, with a high near 59.

Sunday Night: Rain showers likely. Mostly cloudy, with a low around 42.

Monday

High 54°F·Low 37°F

Rain showers likely. Partly sunny, with a high near 54.

Monday Night: A chance of rain showers. Mostly cloudy, with a low around 37.

Tuesday

High 55°F·Low 36°F

A slight chance of rain showers. Mostly sunny, with a high near 55.

Tuesday Night: A slight chance of rain showers before 11pm. Partly cloudy, with a low around 36.

Nearby cities

Larger cities in the area

Other cities in Weld County

See every city we cover in Colorado, or check all active alerts.

About this forecast

Forecast office
Johnstown is served by the National Weather Service BOU forecast office, forecast zone COZ043, county zone COC123.
Location used
The Census Bureau's internal point for Johnstown (40.3072, -104.9112), in Weld County. Population: 20,639 (2024 estimate), number 32 of the 33 Colorado cities on this site.
Radar
Nearest NWS radar: KFTG. View it on radar.weather.gov.

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Sources

  • Forecast, hourly forecast, observations and alerts: National Weather Service API, api.weather.gov/points/40.3072,-104.9112 (forecast issued Oct 28, 4:06 AM MDT).
  • Official forecast page: forecast.weather.gov.
  • City location and population: U.S. Census Bureau, Vintage 2024 population estimates and 2024 Gazetteer files.
  • Snapshot taken Oct 28, 2026. The NWS and Census Bureau do not endorse OpenForecast.

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