Swansea, Illinois Weather
Cicadas claim the scorching afternoon. Day 14 of summer. Read this microseason across nine climate regions →
Swansea weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Light Drizzle26%0.02″96°75°—
- SundayJul 5Rain21%0.29″83°72°-13°
- MondayJul 6Overcast21%—87°69°+4°
- TuesdayJul 7Overcast——85°67°-2°
- WednesdayJul 8Overcast12%—90°66°+5°
- ThursdayJul 9Light Drizzle30%—95°71°+5°
- FridayJul 10T-storm w/ Hail44%0.02″91°72°-4°
AQI 37 (Good), driven by PM2.5. AQI flat over the last 6 hours (within ±3 points). PM2.5 at 9.3 µg/m³, PM10 at 10.1 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 during the projected peak around 10 PM.
What's driving it
Ozone × UV × Sky
Ozone at AQI 40 now. With UV 6.4 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 34 around 1 PM.
- Present
- AQI 40
- UV peak
- 6.4 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 34
PM × Wind × Precip
PM2.5 at 9.3 µg/m³, PM10 at 10.1 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.92
- 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
- 10:52 PM
- Moonset
- 10:07 AM
- In sign
- ♓︎ Pisces
Cicadas claim the scorching afternoon
Swansea at a glance
- Today vs. normal: 16°F above the seasonal normal for this latitude
- Last frost: April 7 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
16-Day Forecast — Swansea
- Sat96°75°26%
- Sun83°72°21%
- Mon87°69°21%
- Tue85°67°7%
- Wed90°66°12%
- Thu95°71°30%
- Fri91°72°44%
- Sat89°73°23%
- Sun79°63°8%
- Mon77°59°6%
- Tue79°61°10%
- Wed82°64°12%
- Thu83°66°14%
- Fri82°68°10%
- Sat86°70°13%
- Sun91°72°16%
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 — Swansea
SPC has placed Swansea 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 Swansea
- 62226