The inland setting means local environmental conditions are shaped more by urban density than coastal influences.
In line with average conditions across San Francisco
24-Hour AQI Trend
Pollutant Breakdown
Peer Comparison
In line with average conditions across 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 | 129.2 | 66% | 5.7 | 9.5 | 14.8 |
| 01:00 | 35 | 127.6 | 70% | 2.4 | 8.8 | 13.5 |
| 02:00 | 34 | 127.0 | 68% | 3.3 | 8.1 | 12.5 |
| 03:00 | 33 | 126.3 | 65% | 3.0 | 7.8 | 11.9 |
| 04:00 | 32 | 123.6 | 70% | 4.2 | 7.8 | 12.0 |
| 05:00 | 31 | 121.8 | 72% | 4.2 | 7.1 | 10.9 |
| 06:00 | 31 | 121.8 | 74% | 2.5 | 6.8 | 10.2 |
| 07:00 | 31 | 125.2 | 75% | 1.6 | 6.3 | 9.5 |
| 08:00 | 31 | 132.8 | 77% | 0.4 | 6.1 | 9.4 |
| 09:00 | 31 | 136.6 | 70% | 0.1 | 6.2 | 9.5 |
| 10:00 | 31 | 143.2 | 57% | 2.1 | 6.7 | 10.2 |
| 11:00 | 31 | 150.3 | 45% | 3.7 | 6.7 | 10.1 |
| 12:00 | 32 | 153.1 | 44% | 5.6 | 6.6 | 10.1 |
| 13:00 | 32 | 158.2 | 40% | 6.0 | 6.7 | 10.3 |
| 14:00 | 33 | 159.8 | 39% | 7.0 | 6.7 | 10.4 |
| 15:00 | 34 | 161.8 | 37% | 6.8 | 6.5 | 10.0 |
| 16:00 | 36 | 162.5 | 35% | 7.1 | 5.8 | 8.9 |
| 17:00 | 37 | 167.7 | 14% | 10.7 | 5.1 | 7.7 |
| 18:00 | 38 | 167.0 | 15% | 11.2 | 5.7 | 8.6 |
| 19:00 | 39 | 162.1 | 17% | 9.9 | 6.0 | 8.8 |
| 20:00 | 40 | 155.8 | 20% | 8.9 | 6.5 | 9.7 |
| 21:00 | 41 | 152.1 | 22% | 9.4 | 5.9 | 8.6 |
| 22:00 | 41 | 148.3 | 24% | 8.9 | 5.5 | 7.8 |
| 23:00 | 41 | 146.1 | 25% | 9.3 | 5.1 | 7.1 |
Air quality is forecast to be good for most of the day. Great time for outdoor activities!
For those in San Francisco who want to make the most of outdoor time, the forecast points to 05:00 (AQI 31) as the ideal window. The AQI drops to 31 at 05:00, while the highest reading of 41 occurs at 21:00 during 21:00 (AQI 41). For those planning outdoor exercise in San Francisco, the forecast offers useful timing information. Air quality is forecast to be good for most of the day. Great time for outdoor activities! Adjusting the intensity and duration of activities based on forecasted conditions is a common approach among fitness enthusiasts.