Johnsonville, Illinois Weather
Cicadas claim the scorching afternoon. Day 14 of summer. Read this microseason across nine climate regions →
Johnsonville weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Partly Cloudy21%—93°70°—
- SundayJul 5Light Drizzle25%0.02″86°72°-7°
- MondayJul 6Thunderstorm14%—87°70°+1°
- TuesdayJul 7Overcast11%—84°67°-3°
- WednesdayJul 8Clear12%—86°66°+2°
- ThursdayJul 9Thunderstorm32%—88°71°+2°
- FridayJul 10Thunderstorm36%0.18″84°71°-4°
AQI 47 (Good), driven by Ozone. AQI flat over the last 6 hours (within ±3 points). Ozone at AQI 43 now. With UV 4.9 peaking around 1 PM under partly cloudy skies, surface ozone likely climbs to AQI 20 around 1 PM.
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion.
What's driving it
Ozone × UV × Sky
Ozone at AQI 43 now. With UV 4.9 peaking around 1 PM under partly cloudy skies, surface ozone likely climbs to AQI 20 around 1 PM.
- Present
- AQI 43
- UV peak
- 4.9 at 1 PM
- Sky at peak
- partly cloudy
- Projected peak
- AQI 20
PM × Wind × Precip
PM2.5 at 5.7 µg/m³, PM10 at 6.0 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.95
- 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
- 10:47 PM
- Moonset
- 10:02 AM
- In sign
- ♓︎ Pisces
Cicadas claim the scorching afternoon
Johnsonville at a glance
- Today vs. normal: 12°F above the seasonal normal for this latitude
- Last frost: April 7 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
ZIP code: 62850
16-Day Forecast — Johnsonville
- Sat93°70°21%
- Sun86°72°25%
- Mon87°70°14%
- Tue84°67°11%
- Wed86°66°12%
- Thu88°71°32%
- Fri84°71°36%
- Sat87°72°29%
- Sun76°62°13%
- Mon73°58°7%
- Tue78°60°12%
- Wed81°63°10%
- Thu82°65°16%
- Fri79°70°19%
- Sat85°70°23%
- Sun87°73°17%
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 — Johnsonville
SPC has placed Johnsonville in the Slight Risk category for severe thunderstorms today.
- TODAYSLGTSlight Risk
- TOMORROWTSTMGeneral Thunderstorms
- DAY 3TSTMGeneral Thunderstorms
Scattered severe storms possible. A few tornadoes, hail, and damaging wind gusts possible.
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 Johnsonville
- 62850