Sleepy Hollow, Illinois Weather
Cicadas claim the afternoon. Day 14 of summer. Read this microseason across nine climate regions →
Sleepy Hollow weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Light Showers76%0.17″82°68°—
- SundayJul 5Overcast19%—79°64°-3°
- MondayJul 6Overcast——79°61°0°
- TuesdayJul 7Overcast——81°58°+2°
- WednesdayJul 8Overcast14%—81°62°0°
- ThursdayJul 9Light Drizzle48%0.01″77°64°-4°
- FridayJul 10Overcast44%—79°62°+2°
AQI 32 (Good), driven by Ozone. AQI flat over the last 6 hours (within ±3 points). Ozone at AQI 36 now. With UV 2.7 peaking around 1 PM under partly cloudy skies, surface ozone likely climbs to AQI 9 around 1 PM.
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 36 now. With UV 2.7 peaking around 1 PM under partly cloudy skies, surface ozone likely climbs to AQI 9 around 1 PM.
- Present
- AQI 36
- UV peak
- 2.7 at 1 PM
- Sky at peak
- partly cloudy
- Projected peak
- AQI 9
PM × Wind × Precip
PM2.5 at 5.0 µg/m³, PM10 at 5.9 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.85
- Wind
- light
- Recent rain
- 1h 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
- 9:57 AM
- In sign
- ♓︎ Pisces
Cicadas claim the afternoon
Sleepy Hollow at a glance
- Today vs. normal: 6°F above the seasonal normal for this latitude
- Last frost: April 29 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
16-Day Forecast — Sleepy Hollow
- Sat82°68°76%
- Sun79°64°19%
- Mon79°61°2%
- Tue81°58°1%
- Wed81°62°14%
- Thu77°64°48%
- Fri79°62°44%
- Sat82°61°12%
- Sun67°59°8%
- Mon73°55°8%
- Tue79°60°7%
- Wed79°63°26%
- Thu83°66°19%
- Fri83°68°26%
- Sat87°69°21%
- Sun85°70°32%
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 — Sleepy Hollow
SPC has placed Sleepy Hollow in the Marginal Risk category for severe thunderstorms today.
- TODAYMRGLMarginal Risk
- TOMORROWTSTMGeneral Thunderstorms
- DAY 3NONENo severe risk
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 Sleepy Hollow
- 60118