Hourly Weather Forecast for Philadelphia, Pennsylvania

Hourly Weather | Today › Saturday, October 24, 2026

Active Weather Warnings

Frost Advisory

Philadelphia, Pennsylvania

1 AM

46°

Feels Like 46°

Humidity: 77%

UV Index: 0

Wind: 4 mph

2 AM

46°

Feels Like 46°

Humidity: 78%

UV Index: 0

Wind: 4 mph

3 AM

46°

Feels Like 45°

Humidity: 77%

UV Index: 0

Wind: 5 mph

4 AM

45°

Feels Like 45°

Humidity: 77%

UV Index: 0

Wind: 5 mph

5 AM

45°

Feels Like 43°

Humidity: 77%

UV Index: 0

Wind: 5 mph

6 AM

45°

Feels Like 43°

Humidity: 78%

UV Index: 0

Wind: 5 mph

7 AM

41°

Feels Like 39°

Humidity: 84%

UV Index: 0

Wind: 5 mph

8 AM

45°

Feels Like 43°

Humidity: 76%

UV Index: 0

Wind: 5 mph

9 AM

48°

Feels Like 48°

Humidity: 66%

UV Index: 1

Wind: 5 mph

10 AM

52°

Feels Like 55°

Humidity: 60%

UV Index: 2

Wind: 5 mph

11 AM

55°

Feels Like 61°

Humidity: 54%

UV Index: 3

Wind: 5 mph

12 PM

59°

Feels Like 64°

Humidity: 46%

UV Index: 3

Wind: 5 mph

1 PM

63°

Feels Like 66°

Humidity: 39%

UV Index: 3

Wind: 5 mph

2 PM

64°

Feels Like 70°

Humidity: 34%

UV Index: 3

Wind: 5 mph

3 PM

66°

Feels Like 70°

Humidity: 32%

UV Index: 3

Wind: 5 mph

4 PM

66°

Feels Like 70°

Humidity: 31%

UV Index: 2

Wind: 5 mph

5 PM

64°

Feels Like 66°

Humidity: 33%

UV Index: 1

Wind: 4 mph

6 PM

63°

Feels Like 63°

Humidity: 39%

UV Index: 0

Wind: 4 mph

7 PM

59°

Feels Like 59°

Humidity: 47%

UV Index: 0

Wind: 4 mph

8 PM

55°

Feels Like 57°

Humidity: 55%

UV Index: 0

Wind: 4 mph

9 PM

54°

Feels Like 54°

Humidity: 63%

UV Index: 0

Wind: 4 mph

10 PM

52°

Feels Like 52°

Humidity: 70%

UV Index: 0

Wind: 4 mph

11 PM

48°

Feels Like 50°

Humidity: 75%

UV Index: 0

Wind: 4 mph

Hourly Air Quality Forecast - AQI (US EPA)

1 AM

30 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 2.54 µg/m³
PM₁₀: 5.39 µg/m³
O₃: 0.032 ppm
NO₂: 2.8 ppb
SO₂: 0.2 ppb
CO: 0.15 ppm

Health Recommendations:

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

2 AM

29 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 2.78 µg/m³
PM₁₀: 5.73 µg/m³
O₃: 0.031 ppm
NO₂: 2.7 ppb
SO₂: 0.2 ppb
CO: 0.14 ppm

Health Recommendations:

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

3 AM

28 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 3.32 µg/m³
PM₁₀: 6.38 µg/m³
O₃: 0.030 ppm
NO₂: 2.8 ppb
SO₂: 0.2 ppb
CO: 0.15 ppm

Health Recommendations:

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

4 AM

26 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 3.95 µg/m³
PM₁₀: 7.08 µg/m³
O₃: 0.028 ppm
NO₂: 2.9 ppb
SO₂: 0.3 ppb
CO: 0.15 ppm

Health Recommendations:

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

5 AM

25 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 4.71 µg/m³
PM₁₀: 7.92 µg/m³
O₃: 0.027 ppm
NO₂: 3.2 ppb
SO₂: 0.3 ppb
CO: 0.15 ppm

Health Recommendations:

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

6 AM

24 AQI

Good air quality Dominant pollutant: PM_2.5

Details

Pollutant Concentrations:

PM_2.5: 5.68 µg/m³
PM₁₀: 9 µg/m³
O₃: 0.024 ppm
NO₂: 3.8 ppb
SO₂: 0.3 ppb
CO: 0.16 ppm

Health Recommendations:

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

7 AM

30 AQI

Good air quality Dominant pollutant: PM_2.5

Details

Pollutant Concentrations:

PM_2.5: 7.1 µg/m³
PM₁₀: 10.6 µg/m³
O₃: 0.022 ppm
NO₂: 5 ppb
SO₂: 0.3 ppb
CO: 0.17 ppm

Health Recommendations:

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

8 AM

37 AQI

Good air quality Dominant pollutant: PM_2.5

Details

Pollutant Concentrations:

PM_2.5: 8.93 µg/m³
PM₁₀: 12.65 µg/m³
O₃: 0.020 ppm
NO₂: 6.8 ppb
SO₂: 0.4 ppb
CO: 0.19 ppm

Health Recommendations:

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

9 AM

43 AQI

Good air quality Dominant pollutant: PM_2.5

Details

Pollutant Concentrations:

PM_2.5: 10.38 µg/m³
PM₁₀: 14.27 µg/m³
O₃: 0.019 ppm
NO₂: 7.5 ppb
SO₂: 0.5 ppb
CO: 0.20 ppm

Health Recommendations:

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

10 AM

47 AQI

Good air quality Dominant pollutant: PM_2.5

Details

Pollutant Concentrations:

PM_2.5: 11.38 µg/m³
PM₁₀: 15.46 µg/m³
O₃: 0.020 ppm
NO₂: 7 ppb
SO₂: 0.7 ppb
CO: 0.22 ppm

Health Recommendations:

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

11 AM

51 AQI

Moderate air quality Dominant pollutant: PM_2.5

Details

Pollutant Concentrations:

PM_2.5: 12.67 µg/m³
PM₁₀: 16.86 µg/m³
O₃: 0.023 ppm
NO₂: 6.8 ppb
SO₂: 1 ppb
CO: 0.22 ppm

Health Recommendations:

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

12 PM

35 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 7.83 µg/m³
PM₁₀: 10.91 µg/m³
O₃: 0.037 ppm
NO₂: 3.9 ppb
SO₂: 1.3 ppb
CO: 0.17 ppm

Health Recommendations:

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

1 PM

40 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 6.94 µg/m³
PM₁₀: 9.7 µg/m³
O₃: 0.043 ppm
NO₂: 2.7 ppb
SO₂: 1.1 ppb
CO: 0.16 ppm

Health Recommendations:

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

2 PM

43 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 7.39 µg/m³
PM₁₀: 10.04 µg/m³
O₃: 0.047 ppm
NO₂: 2.1 ppb
SO₂: 1 ppb
CO: 0.15 ppm

Health Recommendations:

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

3 PM

47 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 8.33 µg/m³
PM₁₀: 10.95 µg/m³
O₃: 0.050 ppm
NO₂: 1.7 ppb
SO₂: 0.9 ppb
CO: 0.15 ppm

Health Recommendations:

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

4 PM

48 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 9.4 µg/m³
PM₁₀: 12.06 µg/m³
O₃: 0.052 ppm
NO₂: 1.6 ppb
SO₂: 0.9 ppb
CO: 0.15 ppm

Health Recommendations:

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

5 PM

48 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 9.8 µg/m³
PM₁₀: 12.52 µg/m³
O₃: 0.052 ppm
NO₂: 1.6 ppb
SO₂: 0.8 ppb
CO: 0.15 ppm

Health Recommendations:

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

6 PM

44 AQI

Good air quality Dominant pollutant: PM_2.5

Details

Pollutant Concentrations:

PM_2.5: 10.5 µg/m³
PM₁₀: 13.46 µg/m³
O₃: 0.048 ppm
NO₂: 2.3 ppb
SO₂: 0.7 ppb
CO: 0.16 ppm

Health Recommendations:

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

7 PM

44 AQI

Good air quality Dominant pollutant: PM_2.5

Details

Pollutant Concentrations:

PM_2.5: 10.49 µg/m³
PM₁₀: 13.79 µg/m³
O₃: 0.043 ppm
NO₂: 3 ppb
SO₂: 0.5 ppb
CO: 0.16 ppm

Health Recommendations:

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

8 PM

44 AQI

Good air quality Dominant pollutant: PM_2.5

Details

Pollutant Concentrations:

PM_2.5: 10.45 µg/m³
PM₁₀: 14.02 µg/m³
O₃: 0.039 ppm
NO₂: 3.2 ppb
SO₂: 0.4 ppb
CO: 0.17 ppm

Health Recommendations:

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

9 PM

42 AQI

Good air quality Dominant pollutant: PM_2.5

Details

Pollutant Concentrations:

PM_2.5: 10 µg/m³
PM₁₀: 13.72 µg/m³
O₃: 0.037 ppm
NO₂: 3.3 ppb
SO₂: 0.3 ppb
CO: 0.17 ppm

Health Recommendations:

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

10 PM

41 AQI

Good air quality Dominant pollutant: PM_2.5

Details

Pollutant Concentrations:

PM_2.5: 9.76 µg/m³
PM₁₀: 13.67 µg/m³
O₃: 0.035 ppm
NO₂: 3.2 ppb
SO₂: 0.2 ppb
CO: 0.17 ppm

Health Recommendations:

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

11 PM

41 AQI

Good air quality Dominant pollutant: PM_2.5

Details

Pollutant Concentrations:

PM_2.5: 9.82 µg/m³
PM₁₀: 13.91 µg/m³
O₃: 0.034 ppm
NO₂: 3.1 ppb
SO₂: 0.2 ppb
CO: 0.17 ppm

Health Recommendations:

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

Current Real-Time Air Quality Report

Weather Alerts and Warnings for Philadelphia

Minor Expected Likely

Frost Advisory

Frost Advisory issued October 23 at 5:28PM EDT until October 24 at 9:00AM EDT by NWS Mount Holly NJ

Oct 24, 12:00 AM → Oct 24, 9:00 AM

WHAT: Temperatures as low as 33 degrees will result in frost
formation.

WHERE: Portions of central, northern, and southern New Jersey and
southeast Pennsylvania.

WHEN: From midnight tonight to 9 AM EDT Saturday.

IMPACTS: Frost could harm sensitive outdoor vegetation. Sensitive
outdoor plants may be killed if left uncovered.

+ Read More

Take steps now to protect tender plants from the cold.

Updated: Oct 23, 11:44 PM Source: NWS Alert

Hourly Air Quality Forecast - AQI (US EPA)

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Weather Alerts and Warnings for Philadelphia

Frost Advisory

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