New Haven, Illinois Weather
Sun climbs to its northern throne. Day 88 of spring. Read this microseason across nine climate regions →
New Haven weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 15Overcast——77°55°—
- TuesdayJun 16Overcast28%—82°58°+5°
- WednesdayJun 17Thunderstorm28%—82°61°0°
- ThursdayJun 18Thunderstorm60%0.10″79°63°-3°
- FridayJun 19Overcast54%—77°59°-2°
- SaturdayJun 20Overcast——79°59°+2°
- SundayJun 21Showers36%0.66″72°63°-7°
AQI 21 (Good), driven by Ozone. Ozone at AQI 43. Overcast through the UV peak window (cloud cover ~69%) — afternoon ozone should stay flat.
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 43. Overcast through the UV peak window (cloud cover ~69%) — afternoon ozone should stay flat.
- Present
- AQI 43
- UV peak
- 7.5 at 1 PM
- Sky at peak
- overcast
- Projected peak
- AQI 22
PM × Wind × Precip
PM2.5 at 6.1 µg/m³ (AQI 34) with a 0.90 fine-to-coarse ratio and 4 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.90
- 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
- 5:34 AM
- Moonset
- 8:30 PM
- In sign
- ♋︎ Cancer
Sun climbs to its northern throne
New Haven at a glance
- Today vs. normal: 4°F below the seasonal normal for this latitude
- Last frost: April 3 (climatological average for this latitude)
- Microseason: Jun 11–15
- Planting window: Stake and prune tomato suckers. Watch for squash vine borers.
16-Day Forecast — New Haven
- Mon77°55°0%
- Tue82°58°28%
- Wed82°61°28%
- Thu79°63°60%
- Fri77°59°54%
- Sat79°59°7%
- Sun72°63°36%
- Mon72°62°51%
- Tue74°58°34%
- Wed78°58°17%
- Thu85°63°13%
- Fri89°71°19%
- Sat88°72°35%
- Sun91°74°39%
- Mon91°71°24%
- Tue88°70°40%
Forecast data from Open-Meteo (CC BY 4.0).
Right now in the garden
Peak growing season
As of June 15, 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 — New Haven
SPC has placed New Haven in the Marginal Risk category for severe thunderstorms day after tomorrow.
- TODAYNONENo severe risk
- TOMORROWTSTMGeneral Thunderstorms
- DAY 3MRGLMarginal 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 New Haven
- 62867