Norwalk, Connecticut Weather
Cicadas claim the afternoon. Day 14 of summer. Read this microseason across nine climate regions →
Norwalk weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Overcast27%—98°76°—
- SundayJul 5Heavy Rain77%0.52″86°72°-12°
- MondayJul 6Heavy Showers88%2.8″72°64°-14°
- TuesdayJul 7Drizzle67%0.17″65°60°-7°
- WednesdayJul 8Overcast13%—80°57°+15°
- ThursdayJul 9Overcast16%—83°69°+3°
- FridayJul 10Light Drizzle38%—86°70°+3°
AQI 35 (Good), driven by PM2.5. AQI flat over the last 6 hours (within ±3 points). PM2.5 at 9.9 µg/m³, PM10 at 10.9 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 6 PM.
What's driving it
Ozone × UV × Sky
Ozone at AQI 43 now. With UV 5.3 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 31 around 1 PM.
- Present
- AQI 43
- UV peak
- 5.3 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 31
PM × Wind × Precip
PM2.5 at 9.9 µg/m³, PM10 at 10.9 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
- 10:49 PM
- Moonset
- 9:56 AM
- In sign
- ♓︎ Pisces
Cicadas claim the afternoon
Norwalk at a glance
- Today vs. normal: 14°F above the seasonal normal for this latitude
- Last frost: April 23 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
ZIP codes: 06850, 06851, 06853, 06854, 06855
16-Day Forecast — Norwalk
- Sat98°76°27%
- Sun86°72°77%
- Mon72°64°88%
- Tue65°60°67%
- Wed80°57°13%
- Thu83°69°16%
- Fri86°70°38%
- Sat76°70°27%
- Sun71°67°29%
- Mon69°63°20%
- Tue72°64°21%
- Wed77°64°23%
- Thu92°73°27%
- Fri93°76°43%
- Sat83°73°43%
- Sun84°70°37%
Forecast data from Open-Meteo (CC BY 4.0).
Live wind & temperature near Norwalk
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 — Norwalk
SPC has placed Norwalk in the Marginal Risk category for severe thunderstorms today.
- TODAYMRGLMarginal Risk
- TOMORROWTSTMGeneral Thunderstorms
- DAY 3TSTMGeneral Thunderstorms
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 Norwalk
- 06854
- 06855
- 06850
- 06851
- 06853
- 06852
- 06856
- 06857
- 06858