Today | Weather | Wednesday, August 12, 2026

Active Weather Warnings

Coastal Flood Statement

Weather in Norwalk, Connecticut

07:48 AM

Now

72° F

Feels Like 72°

Precipitation 0 %

Wind 7 mph

UV Index (0 - 11+) 2

Humidity 73 %

Today

Day 88°

Night 68°

Precipitation 0 %

Wind 7 mph

UV Index (0 - 11+) 8

Warning: High UV Index Today: 8

High risk of harm from unprotected sun exposure. Take precautions: wear a hat, sunglasses, and apply sunscreen regularly if you’ll be outdoors for extended periods.

Norwalk Weather Forecast Updated

35 minutes ago

Last updated on August 12, 2026 at 7:13 AM

Air Quality in Norwalk

NOW

18 AQI

Good air quality Dominant pollutant: PM_2.5

Pollutant Concentrations:

PM_2.5 4.27 µg/m³

PM₁₀ 5.38 µg/m³

O₃ 0.010 ppm

NO₂ 7.3 ppb

SO₂ 1.3 ppb

CO 0.16 ppm

NH₃ 0.31 µg/m³

NO 1.69 µg/m³

PM_2.5 – Fine particles <2.5μm

PM₁₀ – Inhalable particles <10μm

O₃ – Ozone

NO₂ – Nitrogen dioxide

SO₂ – Sulfur dioxide

CO – Carbon monoxide

NH₃ – Ammonia

NO – Nitric oxide

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

Show raw pollutant concentrations (µg/m³)

PM_2.5 – 4.27 µg/m³

PM₁₀ – 5.38 µg/m³

O₃ – 19.55 µg/m³

NO₂ – 13.77 µg/m³

SO₂ – 3.34 µg/m³

CO – 183.36 µg/m³

NH₃ – 0.31 µg/m³

NO – 1.69 µg/m³

View Hourly Air Quality Forecast

Weather Alerts and Warnings for Norwalk

Minor Expected Likely

Coastal Flood Statement

Coastal Flood Statement issued August 12 at 3:07AM EDT until August 13 at 1:00AM EDT by NWS Upton NY

Aug 12, 11:00 PM → Aug 13, 1:00 AM

WHAT: Up to one half foot of inundation above ground level
expected in vulnerable areas near the waterfront and shoreline.

WHERE: In Connecticut, Southern Fairfield County. In New
York, Southern Westchester County.

WHEN: From this evening through late tonight.

IMPACTS: Brief minor flooding of the more vulnerable
locations near the waterfront and shoreline.

ADDITIONAL DETAILS: Another round of localized minor
flooding are likely for the Thursday night high tide.

+ Read More

Do not drive through flooded roadways.

Updated: Aug 12, 7:13 AM Source: NWS Alert