Eureka, Illinois Weather
Cicadas claim the scorching afternoon. Day 14 of summer. Read this microseason across nine climate regions →
Eureka weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Rain57%0.39″85°68°—
- SundayJul 5Overcast15%—82°69°-3°
- MondayJul 6Mostly Clear——81°64°-1°
- TuesdayJul 7Overcast——80°60°-1°
- WednesdayJul 8Light Drizzle——83°63°+3°
- ThursdayJul 9Heavy Drizzle48%0.08″82°69°-1°
- FridayJul 10Overcast48%—76°65°-6°
AQI 27 (Good), driven by PM2.5. AQI down 8 over the last 6 hours (gradual decline). PM2.5 at 8.4 µg/m³, PM10 at 9.4 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 10 PM.
What's driving it
Ozone × UV × Sky
Ozone at AQI 32 now. With UV 3.3 peaking around 1 PM under partly cloudy skies, surface ozone likely climbs to AQI 10 around 1 PM.
- Present
- AQI 32
- UV peak
- 3.3 at 1 PM
- Sky at peak
- partly cloudy
- Projected peak
- AQI 10
PM × Wind × Precip
PM2.5 at 8.4 µg/m³, PM10 at 9.4 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.89
- 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
- 10:53 PM
- Moonset
- 10:02 AM
- In sign
- ♓︎ Pisces
Cicadas claim the scorching afternoon
Eureka at a glance
- Today vs. normal: 9°F above the seasonal normal for this latitude
- Last frost: April 20 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
ZIP code: 61530
16-Day Forecast — Eureka
- Sat85°68°57%
- Sun82°69°15%
- Mon81°64°9%
- Tue80°60°2%
- Wed83°63°5%
- Thu82°69°48%
- Fri76°65°48%
- Sat82°65°14%
- Sun70°59°7%
- Mon73°56°10%
- Tue74°60°10%
- Wed78°62°16%
- Thu81°64°20%
- Fri81°69°29%
- Sat85°70°32%
- Sun84°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 — Eureka
SPC has placed Eureka 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 Eureka
- 61530