Swansea, Illinois Weather
Heat settles and the rain begins. Day 90 of spring. Read this microseason across nine climate regions →
Swansea weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 17Thunderstorm41%0.02″92°63°—
- ThursdayJun 18Overcast32%—80°64°-12°
- FridayJun 19Overcast——80°60°0°
- SaturdayJun 20Overcast12%—83°61°+3°
- SundayJun 21Showers76%0.10″79°64°-4°
- MondayJun 22Overcast76%—76°60°-3°
- TuesdayJun 23Light Drizzle——73°59°-3°
AQI 40 (Good), driven by PM2.5. AQI down 6 over the last 6 hours (gradual decline). PM2.5 at 6.3 µg/m³ (AQI 35) with a 0.91 fine-to-coarse ratio and 2 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.
What's driving it
PM × Wind × Precip
PM2.5 at 6.3 µg/m³ (AQI 35) with a 0.91 fine-to-coarse ratio and 2 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.91
- 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
- 8:04 AM
- Moonset
- 10:32 PM
- In sign
- ♋︎ Cancer
Heat settles and the rain begins
Swansea at a glance
- Today vs. normal: 8°F below the seasonal normal for this latitude
- Last frost: April 7 (climatological average for this latitude)
- Microseason: Jun 16–20
- Planting window: Stake and prune tomato suckers. Watch for squash vine borers.
15-Day Forecast — Swansea
- Wed92°63°41%
- Thu80°64°32%
- Fri80°60°8%
- Sat83°61°12%
- Sun79°64°76%
- Mon76°60°76%
- Tue73°59°7%
- Wed77°65°6%
- Thu84°63°12%
- Fri90°67°19%
- Sat95°72°30%
- Sun95°74°39%
- Mon93°74°32%
- Tue94°74°32%
- Wed87°73°32%
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 — Swansea
SPC has placed Swansea in the Enhanced Risk category for severe thunderstorms tomorrow.
- TODAYTSTMGeneral Thunderstorms
- TOMORROWENHEnhanced Risk
- DAY 3TSTMGeneral Thunderstorms
Numerous severe storms likely. Tornadoes, large hail, and damaging wind gusts possible across the area. Track NWS warnings if storms develop.
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