Today | Weather | Tuesday, June 30, 2026

Active Weather Warnings

Air Quality Alert

Weather in Waterbury, Connecticut

03:23 PM

Now

88° F

Feels Like 93°

Precipitation 36 %

Wind 8 mph

UV Index (0 - 11+) 3

Humidity 53 %

Today

Day 88°

Night 68°

Precipitation 55 %

Wind 7 mph

UV Index (0 - 11+) 10

Warning: High UV Index Today: 10

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.

Waterbury Weather Forecast Updated

Last updated on June 30, 2026 at 2:19 PM

Weather Forecast History

Last Year's Weather on This Day (June 30, 2025)

Day

90°

Night

70°

Wind

4 mph

UV Index

Precipitation

9 %

Air Quality in Waterbury

NOW

72 AQI

Moderate air quality Dominant pollutant: O₃

Pollutant Concentrations:

PM_2.5 8.43 µg/m³

PM₁₀ 10.6 µg/m³

O₃ 0.061 ppm

NO₂ 1.6 ppb

SO₂ 0.6 ppb

CO 0.12 ppm

NH₃ 0.13 µg/m³

NO 0.23 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 acceptable; however, for some pollutants, there may be a moderate health concern for a very small number of people who are unusually sensitive to air pollution.

Show raw pollutant concentrations (µg/m³)

PM_2.5 – 8.43 µg/m³

PM₁₀ – 10.6 µg/m³

O₃ – 119.59 µg/m³

NO₂ – 3.1 µg/m³

SO₂ – 1.48 µg/m³

CO – 132.75 µg/m³

NH₃ – 0.13 µg/m³

NO – 0.23 µg/m³

View Hourly Air Quality Forecast

Weather Alerts and Warnings for Waterbury

Air Quality Alert

Air Quality Alert issued June 29 at 3:03PM EDT by NWS Upton NY

Jun 29, 3:03 PM → Jun 30, 11:00 PM

The Connecticut Department of Energy and Environmental Protection
has issued an Air Quality Action Day for the following counties:

Fairfield, New Haven, and Middlesex.

from 11 AM to 11 PM EDT Tuesday.

An Air Quality Action Day means that Ground Level Ozone within the
region may approach or exceed unhealthy standards. For additional
information, please visit the Connecticut Department of Energy and
Environmental Protection Web site at http://www.ct.gov/deep/aqi

Updated: Jun 30, 2:19 PM Source: NWS Alert