Johnstown, Wyoming Weather
Monsoon storms drench the south. Day 15 of summer. Read this microseason across nine climate regions →
Johnstown weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 5Overcast——93°58°—
- MondayJul 6Overcast43%—89°62°-4°
- TuesdayJul 7Showers43%0.28″91°66°+2°
- WednesdayJul 8Light Drizzle13%—92°62°+1°
- ThursdayJul 9Overcast12%—93°65°+1°
- FridayJul 10Clear——96°66°+3°
- SaturdayJul 11Clear——100°67°+4°
AQI 42 (Good), driven by PM2.5. AQI down 26 over the last 6 hours — air quality is improving sharply. PM2.5 at 17.9 µg/m³, PM10 at 85.7 µg/m³ — typical background levels with no transport signature.
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion.
What's driving it
PM × Wind × Precip
PM2.5 at 17.9 µg/m³, PM10 at 85.7 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.21
- Wind
- light
- Recent rain
- 0h in last 6h
- Pattern
- background
Trends
Seven days of AQI and PM2.5.
Hourly air-quality data from the Copernicus Atmosphere Monitoring Service, charted across the past and next several days. Dashed lines mark the AQI breakpoints at 50 (Good → Moderate) and 100 (Moderate → Unhealthy for Sensitive Groups).
If the first of July be rainy weather, 'twill rain more or less for four weeks together.
- Moonrise
- 11:36 PM
- Moonset
- 11:29 AM
- In sign
- ♓︎ Pisces
Monsoon storms drench the south
Johnstown at a glance
- Today vs. normal: 6°F below the seasonal normal for this latitude
- Last frost: May 5 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
15-Day Forecast — Johnstown
- Sun93°58°1%
- Mon89°62°43%
- Tue91°66°43%
- Wed92°62°13%
- Thu93°65°12%
- Fri96°66°2%
- Sat100°67°2%
- Sun105°72°4%
- Mon101°75°8%
- Tue106°72°16%
- Wed100°74°22%
- Thu100°72°32%
- Fri104°72°40%
- Sat108°74°42%
- Sun90°69°27%
Forecast data from Open-Meteo (CC BY 4.0).
Right now in the garden
Peak growing season
As of July 5, the growing season is at its peak — frost is months away. Continue succession-planting beans and summer squash. Start fall brassicas (broccoli, cabbage, kale) from seed indoors for transplanting in late summer.
SPC Convective Outlook
Storm Prediction Center — Johnstown
SPC includes Johnstown in the general thunderstorm area tomorrow — no severe risk, but storms are possible.
- TODAYNONENo severe risk
- TOMORROWTSTMGeneral Thunderstorms
- DAY 3TSTMGeneral Thunderstorms
Thunderstorms possible. Not severe, but capable of producing lightning and brief heavy rain.
Source: NOAA / NWS Storm Prediction Center categorical convective outlook. Outlooks are re-issued multiple times per day; this page reflects the most recent SPC polygons covering the city’s coordinates.
ZIP codes in Johnstown
- 82516