The inland setting means local environmental conditions are shaped more by urban density than coastal influences.
Air quality is typical for San Francisco
24-Hour AQI Trend
Pollutant Breakdown
Peer Comparison
Air quality is typical for San Francisco
Why San Francisco's Air Is What It Is
San Francisco sits in an inland urban setting where local environmental conditions are shaped primarily by density and development patterns. Temperature swings between day and night can be more pronounced than in coastal areas.
Historical Context
Current AQI of 31 reflects recent monitoring data. Local conditions can shift with weather patterns, traffic volume, and seasonal factors.
24-Hour Hourly Forecast
Best window: 05:00 (AQI 31) · Peak AQI: 41 at 21:00
| Time | AQI | Temp (°F) | Humidity | Wind (mph) | PM2.5 | PM10 |
|---|---|---|---|---|---|---|
| 00:00 | 36 | 127.8 | 68% | 8.9 | 9.5 | 14.8 |
| 01:00 | 35 | 127.4 | 70% | 5.0 | 8.8 | 13.5 |
| 02:00 | 34 | 127.6 | 66% | 2.1 | 8.1 | 12.5 |
| 03:00 | 33 | 126.7 | 65% | 5.1 | 7.8 | 11.9 |
| 04:00 | 32 | 126.0 | 66% | 4.8 | 7.8 | 12.0 |
| 05:00 | 31 | 124.9 | 70% | 5.1 | 7.1 | 10.9 |
| 06:00 | 31 | 124.3 | 73% | 2.3 | 6.8 | 10.2 |
| 07:00 | 31 | 127.2 | 71% | 3.9 | 6.3 | 9.5 |
| 08:00 | 31 | 132.6 | 70% | 3.2 | 6.1 | 9.4 |
| 09:00 | 31 | 136.2 | 63% | 3.5 | 6.2 | 9.5 |
| 10:00 | 31 | 138.7 | 60% | 6.1 | 6.7 | 10.2 |
| 11:00 | 31 | 140.9 | 60% | 8.1 | 6.7 | 10.1 |
| 12:00 | 32 | 142.9 | 59% | 9.0 | 6.6 | 10.1 |
| 13:00 | 32 | 144.7 | 58% | 10.2 | 6.7 | 10.3 |
| 14:00 | 33 | 145.0 | 57% | 11.1 | 6.7 | 10.4 |
| 15:00 | 34 | 145.8 | 57% | 10.4 | 6.5 | 10.0 |
| 16:00 | 36 | 144.7 | 59% | 10.7 | 5.8 | 8.9 |
| 17:00 | 37 | 147.9 | 55% | 6.9 | 5.1 | 7.7 |
| 18:00 | 38 | 157.8 | 28% | 6.8 | 5.7 | 8.6 |
| 19:00 | 39 | 159.6 | 16% | 10.7 | 6.0 | 8.8 |
| 20:00 | 40 | 153.3 | 19% | 8.0 | 6.5 | 9.7 |
| 21:00 | 41 | 150.3 | 19% | 9.3 | 5.9 | 8.6 |
| 22:00 | 41 | 147.4 | 20% | 8.3 | 5.5 | 7.8 |
| 23:00 | 41 | 145.0 | 22% | 8.5 | 5.1 | 7.1 |
Air quality is forecast to be good for most of the day. Great time for outdoor activities!
The hourly forecast for San Francisco provides a roadmap for the day's air quality. The best window for being outside is 05:00 (AQI 31) (lowest reading: 31 at 05:00). The most difficult conditions are during 21:00 (AQI 41) (peak: 41 at 21:00). When the forecast for San Francisco indicates challenging conditions, it may be worth considering indoor alternatives for planned outdoor activities. Air quality is forecast to be good for most of the day. Great time for outdoor activities! Many community centers and facilities in San Francisco offer indoor recreation options.