Johnstown, Ohio Weather
Cicadas claim the scorching afternoon. Day 14 of summer. Read this microseason across nine climate regions →
Johnstown weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Overcast37%—92°70°—
- SundayJul 5Heavy Rain36%2.2″85°71°-7°
- MondayJul 6Thunderstorm37%—79°65°-6°
- TuesdayJul 7Light Drizzle19%—77°63°-2°
- WednesdayJul 8Light Drizzle14%—85°64°+8°
- ThursdayJul 9Thunderstorm49%—82°66°-3°
- FridayJul 10Thunderstorm50%—77°69°-5°
AQI 35 (Good), driven by PM2.5. AQI down 6 over the last 6 hours (gradual decline). PM2.5 at 7.2 µg/m³, PM10 at 8.0 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 during the projected peak around 8 PM.
What's driving it
Ozone × UV × Sky
Ozone at AQI 38 now. With UV 3.8 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 19 around 1 PM.
- Present
- AQI 38
- UV peak
- 3.8 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 19
PM × Wind × Precip
PM2.5 at 7.2 µg/m³, PM10 at 8.0 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.90
- 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
- 11:25 PM
- Moonset
- 10:35 AM
- In sign
- ♓︎ Pisces
Cicadas claim the scorching afternoon
Johnstown at a glance
- Today vs. normal: 8°F above the seasonal normal for this latitude
- Last frost: April 17 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
ZIP code: 43031
16-Day Forecast — Johnstown
- Sat92°70°37%
- Sun85°71°36%
- Mon79°65°37%
- Tue77°63°19%
- Wed85°64°14%
- Thu82°66°49%
- Fri77°69°50%
- Sat84°67°40%
- Sun71°61°28%
- Mon63°54°13%
- Tue76°60°13%
- Wed82°64°29%
- Thu84°67°31%
- Fri84°69°21%
- Sat84°68°45%
- Sun86°69°26%
Forecast data from Open-Meteo (CC BY 4.0).
Right now in the garden
Peak growing season
As of July 4, 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 has placed Johnstown in the Marginal Risk category for severe thunderstorms today.
- TODAYMRGLMarginal Risk
- TOMORROWTSTMGeneral Thunderstorms
- DAY 3TSTMGeneral Thunderstorms
Isolated severe storms possible. Limited threat for hail or damaging wind.
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
- 43031