Saybrook, Illinois Weather
Cicadas claim the scorching afternoon. Day 14 of summer. Read this microseason across nine climate regions →
Saybrook weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Heavy Rain74%0.89″88°70°—
- SundayJul 5Drizzle24%0.03″82°68°-6°
- MondayJul 6Partly Cloudy13%—81°65°-1°
- TuesdayJul 7Overcast——80°60°-1°
- WednesdayJul 8Overcast——81°61°+1°
- ThursdayJul 9T-storm w/ Hail42%0.07″83°69°+2°
- FridayJul 10Foggy42%—77°68°-6°
AQI 29 (Good), driven by PM2.5. AQI down 6 over the last 6 hours (gradual decline). PM2.5 at 7.1 µg/m³, PM10 at 7.9 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 38 now. With UV 5.7 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 29 around 1 PM.
- Present
- AQI 38
- UV peak
- 5.7 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 29
PM × Wind × Precip
PM2.5 at 7.1 µg/m³, PM10 at 7.9 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.90
- 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
- 10:49 PM
- Moonset
- 10:00 AM
- In sign
- ♓︎ Pisces
Cicadas claim the scorching afternoon
Saybrook at a glance
- Today vs. normal: 9°F above the seasonal normal for this latitude
- Last frost: April 19 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
ZIP code: 61770
16-Day Forecast — Saybrook
- Sat88°70°74%
- Sun82°68°24%
- Mon81°65°13%
- Tue80°60°3%
- Wed81°61°6%
- Thu83°69°42%
- Fri77°68°42%
- Sat81°65°12%
- Sun70°58°7%
- Mon71°55°7%
- Tue77°58°11%
- Wed79°62°23%
- Thu81°65°23%
- Fri80°69°20%
- Sat84°70°24%
- Sun80°72°35%
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 — Saybrook
SPC has placed Saybrook 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 Saybrook
- 61770