Hourly Weather Forecast for Boston, Massachusetts

Hourly Weather | Today › Tuesday, July 14, 2026

Active Weather Warnings

Heat Advisory

Boston, Massachusetts

12 PM

88°

Feels Like 93°

Humidity: 49%

UV Index: 8

Wind: 12 mph

1 PM

90°

Feels Like 97°

Humidity: 45%

UV Index: 10

Wind: 13 mph

2 PM

91°

Feels Like 97°

Humidity: 42%

UV Index: 9

Wind: 15 mph

3 PM

93°

Feels Like 97°

Humidity: 41%

UV Index: 7

Wind: 16 mph

4 PM

93°

Feels Like 97°

Humidity: 40%

UV Index: 5

Wind: 17 mph

5 PM

93°

Feels Like 93°

Humidity: 43%

UV Index: 3

Wind: 17 mph

6 PM

91°

Feels Like 91°

Humidity: 46%

UV Index: 2

Wind: 17 mph

7 PM

90°

Feels Like 90°

Humidity: 50%

UV Index: 1

Wind: 16 mph

8 PM

88°

Feels Like 90°

Humidity: 53%

UV Index: 0

Wind: 13 mph

9 PM

84°

Feels Like 86°

Humidity: 59%

UV Index: 0

Wind: 12 mph

10 PM

84°

Feels Like 84°

Humidity: 62%

UV Index: 0

Wind: 12 mph

11 PM

82°

Feels Like 84°

Humidity: 66%

UV Index: 0

Wind: 10 mph

Hourly Air Quality Forecast - AQI (US EPA)

12 PM

77 AQI

Moderate air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 13.81 µg/m³
PM₁₀: 19.59 µg/m³
O₃: 0.063 ppm
NO₂: 1.9 ppb
SO₂: 1.3 ppb
CO: 0.14 ppm

Health Recommendations:

Air quality is acceptable; some pollutants may pose a risk for a small number of unusually sensitive people.

1 PM

108 AQI

Unhealthy air quality for sensitive groups Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 18.07 µg/m³
PM₁₀: 24.56 µg/m³
O₃: 0.073 ppm
NO₂: 1.2 ppb
SO₂: 1.3 ppb
CO: 0.14 ppm

Health Recommendations:

Members of sensitive groups may experience health effects. The general public is less likely to be affected.

2 PM

137 AQI

Unhealthy air quality for sensitive groups Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 21.98 µg/m³
PM₁₀: 29.26 µg/m³
O₃: 0.081 ppm
NO₂: 1 ppb
SO₂: 1.3 ppb
CO: 0.14 ppm

Health Recommendations:

Members of sensitive groups may experience health effects. The general public is less likely to be affected.

3 PM

142 AQI

Unhealthy air quality for sensitive groups Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 21.45 µg/m³
PM₁₀: 28.94 µg/m³
O₃: 0.083 ppm
NO₂: 0.8 ppb
SO₂: 1.2 ppb
CO: 0.14 ppm

Health Recommendations:

Members of sensitive groups may experience health effects. The general public is less likely to be affected.

4 PM

137 AQI

Unhealthy air quality for sensitive groups Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 19.46 µg/m³
PM₁₀: 27.18 µg/m³
O₃: 0.081 ppm
NO₂: 0.8 ppb
SO₂: 1 ppb
CO: 0.13 ppm

Health Recommendations:

Members of sensitive groups may experience health effects. The general public is less likely to be affected.

5 PM

129 AQI

Unhealthy air quality for sensitive groups Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 17.31 µg/m³
PM₁₀: 25.42 µg/m³
O₃: 0.079 ppm
NO₂: 0.8 ppb
SO₂: 0.9 ppb
CO: 0.12 ppm

Health Recommendations:

Members of sensitive groups may experience health effects. The general public is less likely to be affected.

6 PM

120 AQI

Unhealthy air quality for sensitive groups Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 15.48 µg/m³
PM₁₀: 24.22 µg/m³
O₃: 0.076 ppm
NO₂: 1.1 ppb
SO₂: 0.8 ppb
CO: 0.12 ppm

Health Recommendations:

Members of sensitive groups may experience health effects. The general public is less likely to be affected.

7 PM

110 AQI

Unhealthy air quality for sensitive groups Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 14.19 µg/m³
PM₁₀: 23.6 µg/m³
O₃: 0.073 ppm
NO₂: 1.5 ppb
SO₂: 0.8 ppb
CO: 0.12 ppm

Health Recommendations:

Members of sensitive groups may experience health effects. The general public is less likely to be affected.

8 PM

100 AQI

Moderate air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 13.24 µg/m³
PM₁₀: 22.92 µg/m³
O₃: 0.070 ppm
NO₂: 1.9 ppb
SO₂: 0.8 ppb
CO: 0.12 ppm

Health Recommendations:

Air quality is acceptable; some pollutants may pose a risk for a small number of unusually sensitive people.

9 PM

87 AQI

Moderate air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 12.29 µg/m³
PM₁₀: 21.98 µg/m³
O₃: 0.066 ppm
NO₂: 2.1 ppb
SO₂: 0.9 ppb
CO: 0.12 ppm

Health Recommendations:

Air quality is acceptable; some pollutants may pose a risk for a small number of unusually sensitive people.

10 PM

74 AQI

Moderate air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 11.6 µg/m³
PM₁₀: 20.93 µg/m³
O₃: 0.062 ppm
NO₂: 2.2 ppb
SO₂: 0.9 ppb
CO: 0.12 ppm

Health Recommendations:

Air quality is acceptable; some pollutants may pose a risk for a small number of unusually sensitive people.

11 PM

62 AQI

Moderate air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 11.16 µg/m³
PM₁₀: 19.74 µg/m³
O₃: 0.058 ppm
NO₂: 2.3 ppb
SO₂: 1 ppb
CO: 0.12 ppm

Health Recommendations:

Air quality is acceptable; some pollutants may pose a risk for a small number of unusually sensitive people.

Current Real-Time Air Quality Report

Weather Alerts and Warnings for Boston

Moderate Expected Likely

Heat Advisory

Heat Advisory issued July 14 at 1:51AM EDT until July 15 at 8:00PM EDT by NWS Boston/Norton MA

Jul 14, 11:00 AM → Jul 15, 8:00 PM

WHAT: Heat index values up to 101 expected.

WHERE: Portions of northern Connecticut, central, eastern,
northeastern, southeastern, and western Massachusetts, and
northern and southern Rhode Island.

WHEN: From 11 AM this morning to 8 PM EDT Wednesday.

IMPACTS: Hot temperatures and high humidity may cause heat
illnesses.

+ Read More

Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors.

Updated: Jul 14, 11:50 AM Source: NWS Alert

Hourly Air Quality Forecast - AQI (US EPA)

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Weather Alerts and Warnings for Boston

Heat Advisory

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