Cos Cob, Connecticut Weather
Cicadas claim the afternoon. Day 15 of summer. Read this microseason across nine climate regions →
Cos Cob weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 5Drizzle55%0.03″80°71°—
- MondayJul 6Heavy Rain78%0.96″71°65°-9°
- TuesdayJul 7Drizzle80%0.06″68°62°-3°
- WednesdayJul 8Overcast18%—82°57°+14°
- ThursdayJul 9Overcast15%—85°66°+3°
- FridayJul 10Heavy Drizzle44%0.02″83°69°-2°
- SaturdayJul 11Overcast32%—82°63°-1°
AQI 48 (Good), driven by Ozone. AQI up 11 over the last 6 hours (gradual rise). Ozone at AQI 78 — peak already passed at 1 PM under overcast skies. Levels should ease through evening.
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 78 — peak already passed at 1 PM under overcast skies. Levels should ease through evening.
- Present
- AQI 78
- UV peak
- 1.1 at earlier today
- Sky at peak
- overcast
- Projected peak
- AQI 78
PM × Wind × Precip
PM2.5 at 15.5 µg/m³, PM10 at 16.4 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.95
- 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
- 11:12 PM
- Moonset
- 11:03 AM
- In sign
- ♓︎ Pisces
Cicadas claim the afternoon
Cos Cob at a glance
- Today vs. normal: 8°F above the seasonal normal for this latitude
- Last frost: April 22 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
ZIP code: 06807
16-Day Forecast — Cos Cob
- Sun80°71°55%
- Mon71°65°78%
- Tue68°62°80%
- Wed82°57°18%
- Thu85°66°15%
- Fri83°69°44%
- Sat82°63°32%
- Sun82°68°22%
- Mon85°69°20%
- Tue78°67°14%
- Wed81°66°19%
- Thu78°66°32%
- Fri90°66°23%
- Sat85°68°24%
- Sun77°69°26%
- Mon69°66°27%
Forecast data from Open-Meteo (CC BY 4.0).
Right now in the garden
Peak growing season
As of July 5, 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 — Cos Cob
SPC has placed Cos Cob 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 Cos Cob
- 06807