Cornwall, Connecticut Weather
Cicadas claim the afternoon. Day 14 of summer. Read this microseason across nine climate regions →
Cornwall weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Heavy Rain42%0.78″92°72°—
- SundayJul 5Heavy Drizzle51%0.04″85°69°-7°
- MondayJul 6Heavy Showers78%2.8″72°60°-13°
- TuesdayJul 7Rain67%1.4″64°54°-8°
- WednesdayJul 8Partly Cloudy——82°51°+18°
- ThursdayJul 9Partly Cloudy23%—86°60°+4°
- FridayJul 10Light Drizzle37%0.01″85°65°-1°
AQI 43 (Good), driven by Ozone. AQI flat over the last 6 hours (within ±3 points). Ozone at AQI 50 now. With UV 5.3 peaking around 1 PM under partly cloudy skies, surface ozone likely climbs to AQI 25 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 6 PM.
What's driving it
Ozone × UV × Sky
Ozone at AQI 50 now. With UV 5.3 peaking around 1 PM under partly cloudy skies, surface ozone likely climbs to AQI 25 around 1 PM.
- Present
- AQI 50
- UV peak
- 5.3 at 1 PM
- Sky at peak
- partly cloudy
- Projected peak
- AQI 25
PM × Wind × Precip
PM2.5 at 5.9 µg/m³, PM10 at 6.5 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.91
- 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
- 10:50 PM
- Moonset
- 9:54 AM
- In sign
- ♓︎ Pisces
Cicadas claim the afternoon
Cornwall at a glance
- Today vs. normal: 11°F above the seasonal normal for this latitude
- Last frost: April 27 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
ZIP code: 06753
16-Day Forecast — Cornwall
- Sat92°72°42%
- Sun85°69°51%
- Mon72°60°78%
- Tue64°54°67%
- Wed82°51°9%
- Thu86°60°23%
- Fri85°65°37%
- Sat78°65°24%
- Sun70°61°29%
- Mon67°60°19%
- Tue67°61°23%
- Wed84°58°35%
- Thu89°67°26%
- Fri89°68°40%
- Sat85°68°35%
- Sun81°61°33%
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 — Cornwall
SPC includes Cornwall in the general thunderstorm area today — no severe risk, but storms are possible.
- TODAYTSTMGeneral Thunderstorms
- TOMORROWTSTMGeneral Thunderstorms
- DAY 3TSTMGeneral Thunderstorms
Thunderstorms possible. Not severe, but capable of producing lightning and brief heavy rain.
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 Cornwall
- 06753
- 06754
- 06796