Herrin, Illinois Weather
Cicadas claim the scorching afternoon. Day 14 of summer. Read this microseason across nine climate regions →
Herrin weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Showers19%0.24″95°72°—
- SundayJul 5Rain28%0.41″84°70°-11°
- MondayJul 6Heavy Drizzle28%—90°71°+6°
- TuesdayJul 7Overcast21%—88°69°-2°
- WednesdayJul 8Clear18%—91°66°+3°
- ThursdayJul 9Overcast29%—94°72°+3°
- FridayJul 10Light Showers36%0.14″91°73°-3°
AQI 55 (Moderate), driven by Ozone. AQI flat over the last 6 hours (within ±3 points). Ozone at AQI 38 now. With UV 3.3 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 17 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 38 now. With UV 3.3 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 17 around 1 PM.
- Present
- AQI 38
- UV peak
- 3.3 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 17
PM × Wind × Precip
PM2.5 at 6.4 µg/m³ (AQI 36) with a 0.91 fine-to-coarse ratio and 6 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.91
- Wind
- light
- Recent rain
- 0h in last 6h
- Pattern
- stagnant smoke
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
- 10:48 PM
- Moonset
- 10:04 AM
- In sign
- ♓︎ Pisces
Cicadas claim the scorching afternoon
Herrin at a glance
- Today vs. normal: 5°F above the seasonal normal for this latitude
- Last frost: April 3 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
ZIP code: 62948
16-Day Forecast — Herrin
- Sat95°72°19%
- Sun84°70°28%
- Mon90°71°28%
- Tue88°69°21%
- Wed91°66°18%
- Thu94°72°29%
- Fri91°73°36%
- Sat91°70°17%
- Sun80°65°12%
- Mon78°58°4%
- Tue80°60°5%
- Wed87°64°7%
- Thu84°65°13%
- Fri83°69°11%
- Sat84°70°19%
- Sun91°72°23%
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 — Herrin
SPC has placed Herrin 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 Herrin
- 62948
- 62933