Westfield, Illinois Weather
Heat settles and the rain begins. Day 90 of spring. Read this microseason across nine climate regions →
Westfield weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 16Light Drizzle41%—73°56°—
- WednesdayJun 17Thunderstorm55%0.02″83°56°+10°
- ThursdayJun 18Light Drizzle31%—73°63°-10°
- FridayJun 19Overcast——77°57°+4°
- SaturdayJun 20Overcast——80°58°+3°
- SundayJun 21Heavy Showers65%0.72″72°61°-8°
- MondayJun 22Overcast65%—72°54°0°
AQI 48 (Good), driven by Ozone. AQI up 8 over the last 6 hours (gradual rise). Ozone at AQI 38. Overcast through the UV peak window (cloud cover ~86%) — afternoon ozone should stay flat.
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion.
What's driving it
Ozone × UV × Sky
Ozone at AQI 38. Overcast through the UV peak window (cloud cover ~86%) — afternoon ozone should stay flat.
- Present
- AQI 38
- UV peak
- 0.0 at 1 PM
- Sky at peak
- overcast
- Projected peak
- AQI 5
PM × Wind × Precip
PM2.5 at 5.0 µg/m³, PM10 at 5.6 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).
A summer fog for fair, a winter fog for rain.
- Moonrise
- 7:53 AM
- Moonset
- 10:27 PM
- In sign
- ♋︎ Cancer
Heat settles and the rain begins
Westfield at a glance
- Today vs. normal: 9°F below the seasonal normal for this latitude
- Last frost: April 13 (climatological average for this latitude)
- Microseason: Jun 16–20
- Planting window: Stake and prune tomato suckers. Watch for squash vine borers.
16-Day Forecast — Westfield
- Tue73°56°41%
- Wed83°56°55%
- Thu73°63°31%
- Fri77°57°4%
- Sat80°58°6%
- Sun72°61°65%
- Mon72°54°65%
- Tue74°55°12%
- Wed76°62°10%
- Thu81°62°12%
- Fri84°65°24%
- Sat89°68°42%
- Sun90°69°39%
- Mon89°72°42%
- Tue88°72°55%
- Wed83°71°46%
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 — Westfield
SPC has placed Westfield in the Enhanced Risk category for severe thunderstorms tomorrow.
- TODAYSLGTSlight Risk
- TOMORROWENHEnhanced Risk
- DAY 3NONENo severe risk
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 Westfield
- 62474