Seneca, Illinois Weather
Cicadas claim the afternoon. Day 14 of summer. Read this microseason across nine climate regions →
Seneca weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Heavy Rain80%1.6″85°72°—
- SundayJul 5Foggy16%—80°69°-5°
- MondayJul 6Mostly Clear——80°64°0°
- TuesdayJul 7Overcast——81°59°+1°
- WednesdayJul 8Overcast23%—81°64°0°
- ThursdayJul 9Thunderstorm35%0.08″81°67°0°
- FridayJul 10Overcast28%—79°63°-2°
AQI 31 (Good), driven by PM2.5. AQI down 7 over the last 6 hours (gradual decline). PM2.5 at 5.5 µg/m³, PM10 at 6.1 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.
What's driving it
PM × Wind × Precip
PM2.5 at 5.5 µg/m³, PM10 at 6.1 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.90
- 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
- 10:51 PM
- Moonset
- 9:59 AM
- In sign
- ♓︎ Pisces
Cicadas claim the afternoon
Seneca at a glance
- Today vs. normal: 7°F above the seasonal normal for this latitude
- Last frost: April 24 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
ZIP code: 61360
16-Day Forecast — Seneca
- Sat85°71°80%
- Sun80°69°16%
- Mon80°64°4%
- Tue81°59°3%
- Wed81°64°23%
- Thu81°67°35%
- Fri79°63°28%
- Sat82°64°14%
- Sun69°59°7%
- Mon73°56°11%
- Tue78°60°12%
- Wed79°62°26%
- Thu82°65°21%
- Fri82°69°29%
- Sat86°70°23%
- Sun82°72°31%
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 — Seneca
SPC has placed Seneca in the Marginal Risk category for severe thunderstorms today.
- TODAYMRGLMarginal Risk
- TOMORROWTSTMGeneral Thunderstorms
- DAY 3TSTMGeneral Thunderstorms
Isolated severe storms possible. Limited threat for hail or damaging wind.
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 Seneca
- 60450
- 61360