Delavan, Illinois Weather
Cicadas claim the scorching afternoon. Day 14 of summer. Read this microseason across nine climate regions →
Delavan weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Rain61%0.17″85°68°—
- SundayJul 5Overcast16%—81°70°-4°
- MondayJul 6Overcast——82°65°+1°
- TuesdayJul 7Mostly Clear——80°61°-2°
- WednesdayJul 8Light Drizzle10%—84°63°+4°
- ThursdayJul 9Drizzle36%0.05″83°70°-1°
- FridayJul 10Light Drizzle36%—78°68°-5°
AQI 28 (Good), driven by PM2.5. AQI down 12 over the last 6 hours (gradual decline). PM2.5 at 5.5 µg/m³ (AQI 31) with a 0.92 fine-to-coarse ratio and 6 mph wind — combustion smoke trapped in calm air, not road dust.
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
PM × Wind × Precip
PM2.5 at 5.5 µg/m³ (AQI 31) with a 0.92 fine-to-coarse ratio and 6 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.92
- 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
- 10:53 PM
- Moonset
- 10:04 AM
- In sign
- ♓︎ Pisces
Cicadas claim the scorching afternoon
Delavan at a glance
- Today vs. normal: 5°F above the seasonal normal for this latitude
- Last frost: April 18 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
ZIP code: 61734
16-Day Forecast — Delavan
- Sat86°68°61%
- Sun81°70°16%
- Mon82°65°5%
- Tue80°61°5%
- Wed84°63°10%
- Thu83°70°36%
- Fri78°68°36%
- Sat83°66°25%
- Sun71°59°9%
- Mon74°57°6%
- Tue75°60°9%
- Wed78°63°16%
- Thu82°65°20%
- Fri82°69°29%
- Sat85°70°32%
- Sun86°72°35%
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 — Delavan
SPC has placed Delavan 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 Delavan
- 61734