Hourly Weather Forecast for San Francisco, CA

Hourly Weather | Today › Sunday, September 21, 2025

San Francisco, California

1 AM

63°

Feels Like 61°

Humidity: 84%

Wind: 8 mph

UV Index: 0

2 AM

63°

Feels Like 59°

Humidity: 85%

Wind: 8 mph

UV Index: 0

3 AM

61°

Feels Like 59°

Humidity: 86%

Wind: 7 mph

UV Index: 0

4 AM

61°

Feels Like 59°

Humidity: 87%

Wind: 6 mph

UV Index: 0

5 AM

61°

Feels Like 59°

Humidity: 88%

Wind: 6 mph

UV Index: 0

6 AM

61°

Feels Like 59°

Humidity: 89%

Wind: 6 mph

UV Index: 0

7 AM

59°

Feels Like 57°

Humidity: 93%

Wind: 6 mph

UV Index: 0

8 AM

61°

Feels Like 61°

Humidity: 87%

Wind: 5 mph

UV Index: 4

9 AM

64°

Feels Like 64°

Humidity: 80%

Wind: 5 mph

UV Index: 8

10 AM

66°

Feels Like 66°

Humidity: 73%

Wind: 6 mph

UV Index: 12

11 AM

70°

Feels Like 70°

Humidity: 67%

Wind: 6 mph

UV Index: 16

12 PM

72°

Feels Like 73°

Humidity: 61%

Wind: 7 mph

UV Index: 20

1 PM

75°

Feels Like 73°

Humidity: 56%

Wind: 9 mph

UV Index: 22

2 PM

75°

Feels Like 79°

Humidity: 54%

Wind: 10 mph

UV Index: 49

3 PM

75°

Feels Like 75°

Humidity: 56%

Wind: 12 mph

UV Index: 41

4 PM

73°

Feels Like 73°

Humidity: 58%

Wind: 12 mph

UV Index: 29

5 PM

72°

Feels Like 72°

Humidity: 61%

Wind: 13 mph

UV Index: 19

6 PM

72°

Feels Like 70°

Humidity: 62%

Wind: 12 mph

UV Index: 9

7 PM

70°

Feels Like 66°

Humidity: 67%

Wind: 10 mph

UV Index: 0

8 PM

66°

Feels Like 64°

Humidity: 72%

Wind: 9 mph

UV Index: 0

9 PM

66°

Feels Like 63°

Humidity: 74%

Wind: 8 mph

UV Index: 0

10 PM

64°

Feels Like 63°

Humidity: 76%

Wind: 8 mph

UV Index: 0

11 PM

64°

Feels Like 63°

Humidity: 79%

Wind: 7 mph

UV Index: 0

Hourly Air Quality Forecast - AQI (US EPA)

1 AM

53 AQI

Moderate air quality Dominant pollutant: pm25

Details

Pollutant Concentrations:

PM2.5: 13.68 µg/m³
PM10: 22.23 µg/m³
O₃: 24.94 ppb
NO₂: 12.05 ppb
SO₂: 0.91 ppb
CO: 117.01 ppb

Health Recommendations:

Air quality is currently in the acceptable range. However, sensitive individuals should be aware of potential risks from certain pollutants.

2 AM

53 AQI

Moderate air quality Dominant pollutant: pm25

Details

Pollutant Concentrations:

PM2.5: 13.27 µg/m³
PM10: 20.50 µg/m³
O₃: 26.31 ppb
NO₂: 9.78 ppb
SO₂: 0.77 ppb
CO: 121.78 ppb

Health Recommendations:

Air quality is currently in the acceptable range. However, sensitive individuals should be aware of potential risks from certain pollutants.

3 AM

53 AQI

Moderate air quality Dominant pollutant: pm25

Details

Pollutant Concentrations:

PM2.5: 13.01 µg/m³
PM10: 18.88 µg/m³
O₃: 27.35 ppb
NO₂: 7.64 ppb
SO₂: 0.67 ppb
CO: 126.12 ppb

Health Recommendations:

Air quality is currently in the acceptable range. However, sensitive individuals should be aware of potential risks from certain pollutants.

4 AM

54 AQI

Moderate air quality Dominant pollutant: pm25

Details

Pollutant Concentrations:

PM2.5: 12.91 µg/m³
PM10: 18.15 µg/m³
O₃: 28.06 ppb
NO₂: 6.38 ppb
SO₂: 0.63 ppb
CO: 126.55 ppb

Health Recommendations:

Air quality is currently in the acceptable range. However, sensitive individuals should be aware of potential risks from certain pollutants.

5 AM

54 AQI

Moderate air quality Dominant pollutant: pm25

Details

Pollutant Concentrations:

PM2.5: 12.82 µg/m³
PM10: 17.75 µg/m³
O₃: 28.65 ppb
NO₂: 5.48 ppb
SO₂: 0.61 ppb
CO: 125.41 ppb

Health Recommendations:

Air quality is currently in the acceptable range. However, sensitive individuals should be aware of potential risks from certain pollutants.

6 AM

54 AQI

Moderate air quality Dominant pollutant: pm25

Details

Pollutant Concentrations:

PM2.5: 12.72 µg/m³
PM10: 17.39 µg/m³
O₃: 28.31 ppb
NO₂: 5.22 ppb
SO₂: 0.65 ppb
CO: 127.07 ppb

Health Recommendations:

Air quality is currently in the acceptable range. However, sensitive individuals should be aware of potential risks from certain pollutants.

7 AM

55 AQI

Moderate air quality Dominant pollutant: pm25

Details

Pollutant Concentrations:

PM2.5: 12.44 µg/m³
PM10: 15.80 µg/m³
O₃: 28.54 ppb
NO₂: 3.37 ppb
SO₂: 0.62 ppb
CO: 132.94 ppb

Health Recommendations:

Air quality is currently in the acceptable range. However, sensitive individuals should be aware of potential risks from certain pollutants.

8 AM

55 AQI

Moderate air quality Dominant pollutant: pm25

Details

Pollutant Concentrations:

PM2.5: 12.49 µg/m³
PM10: 15.86 µg/m³
O₃: 27.91 ppb
NO₂: 3.57 ppb
SO₂: 0.69 ppb
CO: 133.75 ppb

Health Recommendations:

Air quality is currently in the acceptable range. However, sensitive individuals should be aware of potential risks from certain pollutants.

9 AM

55 AQI

Moderate air quality Dominant pollutant: pm25

Details

Pollutant Concentrations:

PM2.5: 11.80 µg/m³
PM10: 15.13 µg/m³
O₃: 29.79 ppb
NO₂: 3.34 ppb
SO₂: 0.75 ppb
CO: 135.15 ppb

Health Recommendations:

Air quality is currently in the acceptable range. However, sensitive individuals should be aware of potential risks from certain pollutants.

10 AM

55 AQI

Moderate air quality Dominant pollutant: pm25

Details

Pollutant Concentrations:

PM2.5: 11.57 µg/m³
PM10: 14.85 µg/m³
O₃: 31.67 ppb
NO₂: 3.10 ppb
SO₂: 0.82 ppb
CO: 136.54 ppb

Health Recommendations:

Air quality is currently in the acceptable range. However, sensitive individuals should be aware of potential risks from certain pollutants.

11 AM

56 AQI

Moderate air quality Dominant pollutant: pm25

Details

Pollutant Concentrations:

PM2.5: 11.92 µg/m³
PM10: 15.28 µg/m³
O₃: 33.55 ppb
NO₂: 2.87 ppb
SO₂: 0.88 ppb
CO: 137.94 ppb

Health Recommendations:

Air quality is currently in the acceptable range. However, sensitive individuals should be aware of potential risks from certain pollutants.

12 PM

56 AQI

Moderate air quality Dominant pollutant: pm25

Details

Pollutant Concentrations:

PM2.5: 11.91 µg/m³
PM10: 15.19 µg/m³
O₃: 36.53 ppb
NO₂: 2.87 ppb
SO₂: 1.01 ppb
CO: 139.75 ppb

Health Recommendations:

Air quality is currently in the acceptable range. However, sensitive individuals should be aware of potential risks from certain pollutants.

1 PM

56 AQI

Moderate air quality Dominant pollutant: pm25

Details

Pollutant Concentrations:

PM2.5: 12.53 µg/m³
PM10: 15.80 µg/m³
O₃: 39.51 ppb
NO₂: 2.87 ppb
SO₂: 1.13 ppb
CO: 141.56 ppb

Health Recommendations:

Air quality is currently in the acceptable range. However, sensitive individuals should be aware of potential risks from certain pollutants.

2 PM

56 AQI

Moderate air quality Dominant pollutant: pm25

Details

Pollutant Concentrations:

PM2.5: 13.11 µg/m³
PM10: 16.47 µg/m³
O₃: 42.48 ppb
NO₂: 2.88 ppb
SO₂: 1.26 ppb
CO: 143.37 ppb

Health Recommendations:

Air quality is currently in the acceptable range. However, sensitive individuals should be aware of potential risks from certain pollutants.

3 PM

56 AQI

Moderate air quality Dominant pollutant: pm25

Details

Pollutant Concentrations:

PM2.5: 13.14 µg/m³
PM10: 16.45 µg/m³
O₃: 41.94 ppb
NO₂: 3.08 ppb
SO₂: 1.18 ppb
CO: 142.28 ppb

Health Recommendations:

Air quality is currently in the acceptable range. However, sensitive individuals should be aware of potential risks from certain pollutants.

4 PM

56 AQI

Moderate air quality Dominant pollutant: pm25

Details

Pollutant Concentrations:

PM2.5: 12.66 µg/m³
PM10: 15.93 µg/m³
O₃: 41.40 ppb
NO₂: 3.29 ppb
SO₂: 1.11 ppb
CO: 141.19 ppb

Health Recommendations:

Air quality is currently in the acceptable range. However, sensitive individuals should be aware of potential risks from certain pollutants.

5 PM

57 AQI

Moderate air quality Dominant pollutant: pm25

Details

Pollutant Concentrations:

PM2.5: 12.18 µg/m³
PM10: 15.32 µg/m³
O₃: 40.86 ppb
NO₂: 3.50 ppb
SO₂: 1.04 ppb
CO: 140.10 ppb

Health Recommendations:

Air quality is currently in the acceptable range. However, sensitive individuals should be aware of potential risks from certain pollutants.

6 PM

57 AQI

Moderate air quality Dominant pollutant: pm25

Details

Pollutant Concentrations:

PM2.5: 12.04 µg/m³
PM10: 15.23 µg/m³
O₃: 34.99 ppb
NO₂: 5.67 ppb
SO₂: 0.97 ppb
CO: 148.21 ppb

Health Recommendations:

Air quality is currently in the acceptable range. However, sensitive individuals should be aware of potential risks from certain pollutants.

7 PM

57 AQI

Moderate air quality Dominant pollutant: pm25

Details

Pollutant Concentrations:

PM2.5: 11.81 µg/m³
PM10: 14.97 µg/m³
O₃: 29.12 ppb
NO₂: 7.83 ppb
SO₂: 0.90 ppb
CO: 156.32 ppb

Health Recommendations:

Air quality is currently in the acceptable range. However, sensitive individuals should be aware of potential risks from certain pollutants.

8 PM

57 AQI

Moderate air quality Dominant pollutant: pm25

Details

Pollutant Concentrations:

PM2.5: 11.82 µg/m³
PM10: 14.72 µg/m³
O₃: 23.25 ppb
NO₂: 10.00 ppb
SO₂: 0.83 ppb
CO: 164.43 ppb

Health Recommendations:

Air quality is currently in the acceptable range. However, sensitive individuals should be aware of potential risks from certain pollutants.

9 PM

57 AQI

Moderate air quality Dominant pollutant: pm25

Details

Pollutant Concentrations:

PM2.5: 11.63 µg/m³
PM10: 14.41 µg/m³
O₃: 21.51 ppb
NO₂: 10.36 ppb
SO₂: 0.79 ppb
CO: 165.31 ppb

Health Recommendations:

Air quality is currently in the acceptable range. However, sensitive individuals should be aware of potential risks from certain pollutants.

10 PM

57 AQI

Moderate air quality Dominant pollutant: pm25

Details

Pollutant Concentrations:

PM2.5: 11.46 µg/m³
PM10: 14.16 µg/m³
O₃: 19.77 ppb
NO₂: 10.73 ppb
SO₂: 0.75 ppb
CO: 166.20 ppb

Health Recommendations:

Air quality is currently in the acceptable range. However, sensitive individuals should be aware of potential risks from certain pollutants.

11 PM

57 AQI

Moderate air quality Dominant pollutant: pm25

Details

Pollutant Concentrations:

PM2.5: 11.44 µg/m³
PM10: 14.00 µg/m³
O₃: 18.03 ppb
NO₂: 11.09 ppb
SO₂: 0.71 ppb
CO: 167.08 ppb

Health Recommendations:

Air quality is currently in the acceptable range. However, sensitive individuals should be aware of potential risks from certain pollutants.

Current Real-Time Air Quality Report