Westchester, Illinois Weather
Fireflies rise from the lawn. Day 77 of spring. Read this microseason across nine climate regions →
Westchester weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 4Overcast——87°61°—
- FridayJun 5Heavy Showers44%1.2″81°69°-6°
- SaturdayJun 6Drizzle56%—85°69°+4°
- SundayJun 7Showers18%—83°67°-2°
- MondayJun 8Light Showers40%0.22″70°67°-13°
- TuesdayJun 9Light Showers34%—89°69°+19°
- WednesdayJun 10Heavy Drizzle25%0.01″91°73°+2°
Ozone at AQI 117 — peak already passed at 1 PM under partly cloudy skies. AQI up 19 in the last 6 hours — air quality is degrading. Levels should ease through evening.
CAUTION Sensitive groups (children, elderly, respiratory conditions) should limit prolonged outdoor exertion.
What's driving it
Ozone × UV × Sky
Ozone at AQI 117 — peak already passed at 1 PM under partly cloudy skies. Levels should ease through evening.
- Present
- AQI 117
- UV peak
- 5.5 at earlier today
- Sky at peak
- partly cloudy
- Projected peak
- AQI 117
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
- 4:27 AM
- Moonset
- 1:47 PM
- In sign
- ♒︎ Aquarius
Fireflies rise from the lawn
Westchester at a glance
- Today vs. normal: 13°F above the seasonal normal for this latitude
- Last frost: April 27 (climatological average for this latitude)
- Microseason: Jun 1–5
- Planting window: Harvest spring lettuce before it bolts. Sow heat-tolerant greens.
Right now in the garden
Peak growing season
As of June 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 — Westchester
SPC has placed Westchester in the Marginal Risk category for severe thunderstorms tomorrow.
- TODAYNONENo severe risk
- TOMORROWMRGLMarginal Risk
- 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.