Calhoun, Illinois Weather
Heat settles and the rain begins. Day 90 of spring. Read this microseason across nine climate regions →
Calhoun weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 16Light Drizzle53%0.01″80°57°—
- WednesdayJun 17Thunderstorm33%—85°61°+5°
- ThursdayJun 18Rain56%0.28″80°63°-5°
- FridayJun 19Overcast——79°60°-1°
- SaturdayJun 20Overcast——80°60°+1°
- SundayJun 21Thunderstorm72%0.01″80°62°0°
- MondayJun 22Overcast72%—75°59°-5°
AQI 46 (Good), driven by Ozone. AQI flat over the last 6 hours (within ±3 points). Ozone at AQI 36. Overcast through the UV peak window (cloud cover ~100%) — afternoon ozone should stay flat.
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 36. Overcast through the UV peak window (cloud cover ~100%) — afternoon ozone should stay flat.
- Present
- AQI 36
- UV peak
- 0.0 at 1 PM
- Sky at peak
- overcast
- Projected peak
- AQI 4
PM × Wind × Precip
PM2.5 at 5.9 µg/m³ (AQI 33) with a 0.89 fine-to-coarse ratio and 1 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.89
- Wind
- calm
- 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).
A summer fog for fair, a winter fog for rain.
- Moonrise
- 7:56 AM
- Moonset
- 10:24 PM
- In sign
- ♋︎ Cancer
Heat settles and the rain begins
Calhoun at a glance
- Today vs. normal: 10°F below the seasonal normal for this latitude
- Last frost: April 8 (climatological average for this latitude)
- Microseason: Jun 16–20
- Planting window: Stake and prune tomato suckers. Watch for squash vine borers.
16-Day Forecast — Calhoun
- Tue80°57°53%
- Wed85°61°33%
- Thu80°63°56%
- Fri79°60°5%
- Sat80°60°5%
- Sun80°62°72%
- Mon75°59°72%
- Tue78°57°5%
- Wed77°63°4%
- Thu84°63°14%
- Fri87°66°25%
- Sat91°70°29%
- Sun91°71°32%
- Mon90°71°49%
- Tue91°73°37%
- Wed89°71°35%
Forecast data from Open-Meteo (CC BY 4.0).
Right now in the garden
Peak growing season
As of June 17, 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 — Calhoun
SPC has placed Calhoun in the Slight Risk category for severe thunderstorms tomorrow.
- TODAYMRGLMarginal Risk
- TOMORROWSLGTSlight Risk
- 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 Calhoun
- 62419