Today | Weather | Tuesday, June 30, 2026

Active Weather Warnings

Air Quality Alert

Weather in Hartford, Connecticut

05:28 PM

Now

86° F

Feels Like 84°

Precipitation 51 %

Wind 12 mph

UV Index (0 - 11+) 1

Humidity 53 %

Today

Day 90°

Night 70°

Precipitation 55 %

Wind 7 mph

UV Index (0 - 11+) 9

Warning: High UV Index Today: 9

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.

Hartford Weather Forecast Updated

3 minutes ago

Last updated on June 30, 2026 at 5:24 PM

Weather Forecast History

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

Day

90°

Night

73°

Wind

4 mph

UV Index

Precipitation

6 %

Air Quality in Hartford

NOW

64 AQI

Moderate air quality Dominant pollutant: O₃

Pollutant Concentrations:

PM_2.5 7.35 µg/m³

PM₁₀ 9.72 µg/m³

O₃ 0.058 ppm

NO₂ 1.6 ppb

SO₂ 0.5 ppb

CO 0.11 ppm

NH₃ 0.13 µg/m³

NO 0.18 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 – 7.35 µg/m³

PM₁₀ – 9.72 µg/m³

O₃ – 114.76 µg/m³

NO₂ – 2.94 µg/m³

SO₂ – 1.28 µg/m³

CO – 122.01 µg/m³

NH₃ – 0.13 µg/m³

NO – 0.18 µg/m³

View Hourly Air Quality Forecast

Weather Alerts and Warnings for Hartford

Air Quality Alert

Air Quality Alert issued June 30 at 3:00PM EDT by NWS Boston/Norton MA

Jun 30, 3:00 PM → Jun 30, 11:00 PM

The Connecticut Department of Environmental Protection has issued an
Air Quality Alert Day for Ground Level Ozone, until 11 PM EDT this
evening.

An Air Quality Alert day means that Ground Level Ozone
concentrations within the region may approach or exceed unhealthy
standards. For additional information, please visit the Connecticut
Department of Energy and Environmental Protection website at:

https://portal.ct.gov/deep

Updated: Jun 30, 5:24 PM Source: NWS Alert