5-day weather forecast San Francisco Sep 19, 2026
17°Weather forecast San Francisco Saturday Sep 19, 2026: overcast, temperature from 14 °C to 17 °C.
Precipitation probability 28%. Wind up to 6.81 m/s (gusts 8.72 m/s). Air humidity 78–90%, atmospheric pressure 761–763 mm Hg, UV index up to 6.6.
Weather Alerts
Small Craft Advisory issued September 15 at 8:42PM PDT until September 16 at 9:00PM PDT by NWS San Francisco CA
Small Craft Advisory
* WHAT...West winds 10 to 15 kt with gusts up to 25 kt and choppy
waters expected.
* WHERE...San Francisco Bay South of the Bay Bridge.
* WHEN...From 9 AM to 9 PM PDT Wednesday.
* IMPACTS...Conditions will be hazardous to small craft.
Inexperienced mariners, especially those operating smaller
vessels, should avoid navigating in hazardous conditions.
Small Craft Advisory issued September 15 at 2:17PM PDT until September 16 at 9:00PM PDT by NWS San Francisco CA
Small Craft Advisory
* WHAT...West winds 10 to 15 kt with gusts to 25 kt and choppy
waters expected.
* WHERE...San Francisco Bay South of the Bay Bridge.
* WHEN...From 9 AM to 9 PM PDT Wednesday.
* IMPACTS...Conditions will be hazardous to small craft.
Inexperienced mariners, especially those operating smaller
vessels, should avoid navigating in hazardous conditions.
5 days at a glance — tap a day to open it
Sunrise 06:55
Sunset 19:11
Sunset 19:11
First Quarter63% illuminated
Moonrise 15:46 · Moonset 00:06
Moonrise 15:46 · Moonset 00:06
Chart
Table
| Time | Weather | Temperature | Rain chance | Cloud cover | Humidity | Pressure | Wind | UV Index |
|---|---|---|---|---|---|---|---|---|
| 00:00 |  Partly cloudy | 15 °C | 15% | 25% | 89% | 763 mm Hg | W 264° 4.69 (6.42) m/s | 0 |
| 01:00 | Partly cloudy | 15 °C | 16% | 31% | 90% | 762 mm Hg | W 263° 4.11 (5.83) m/s | 0 |
| 02:00 | Partly cloudy | 15 °C | 17% | 37% | 89% | 762 mm Hg | W 261° 4 (5.69) m/s | 0 |
| 03:00 | Partly cloudy | 15 °C | 17% | 41% | 89% | 762 mm Hg | W 260° 3.89 (5.42) m/s | 0 |
| 04:00 | Partly cloudy | 15 °C | 18% | 43% | 89% | 762 mm Hg | W 260° 3.89 (5.19) m/s | 0 |
| 05:00 | Partly cloudy | 14 °C | 19% | 51% | 89% | 762 mm Hg | WSW 256° 3.61 (4.81) m/s | 0 |
| 06:00 | Partly cloudy | 15 °C | 21% | 62% | 89% | 762 mm Hg | WSW 256° 4.11 (5.11) m/s | 0 |
| 07:00 |  Cloudy | 14 °C | 22% | 70% | 89% | 762 mm Hg | WSW 250° 3.39 (4.19) m/s | 0 |
| 08:00 | Overcast | 15 °C | 26% | 88% | 88% | 762 mm Hg | WSW 240° 3.39 (4.11) m/s | 0.2 |
| 09:00 | Overcast | 15 °C | 26% | 92% | 86% | 763 mm Hg | WSW 239° 3.61 (4.11) m/s | 1 |
| 10:00 |  Patchy rain possible | 15 °C | 20% (0.01 mm/hr) | 70% | 83% | 763 mm Hg | WSW 242° 4 (4.31) m/s | 2.4 |
| 11:00 | Cloudy | 16 °C | 17% | 68% | 80% | 763 mm Hg | WSW 246° 3.61 (3.81) m/s | 4.1 |
| 12:00 | Overcast | 16 °C | 23% | 100% | 78% | 762 mm Hg | WSW 250° 4.31 (4.39) m/s | 5.7 |
| 13:00 | Overcast | 16 °C | 23% | 98% | 80% | 762 mm Hg | WSW 249° 5.11 (5.22) m/s | 6.6 |
| 14:00 | Overcast | 16 °C | 24% | 98% | 80% | 761 mm Hg | WSW 255° 5.89 (6.42) m/s | 6.4 |
| 15:00 |  Partly cloudy | 17 °C | 11% | 25% | 80% | 761 mm Hg | W 260° 6.31 (7.31) m/s | 5 |
| 16:00 |  Sunny | 17 °C | 10% | 18% | 80% | 761 mm Hg | W 263° 6.81 (8.31) m/s | 3.2 |
| 17:00 | Sunny | 17 °C | 10% | 18% | 80% | 761 mm Hg | W 268° 6.69 (8.5) m/s | 1.4 |
| 18:00 | Overcast | 16 °C | 25% | 100% | 83% | 761 mm Hg | W 266° 6.69 (8.72) m/s | 0.4 |
| 19:00 | Overcast | 15 °C | 27% | 100% | 86% | 761 mm Hg | W 274° 6.31 (8.33) m/s | 0 |
| 20:00 | Partly cloudy | 15 °C | 15% | 26% | 88% | 761 mm Hg | W 280° 5.69 (7.19) m/s | 0 |
| 21:00 |  Overcast | 15 °C | 28% | 100% | 87% | 761 mm Hg | W 276° 5.89 (7.81) m/s | 0 |
| 22:00 | Overcast | 15 °C | 28% | 100% | 88% | 761 mm Hg | W 272° 5.61 (7.83) m/s | 0 |
| 23:00 |  Cloudy | 15 °C | 21% | 67% | 88% | 761 mm Hg | W 276° 5.61 (7.11) m/s | 0 |
San Francisco on the map
Data Sources & Methodology
Our weather forecasts are powered by a professional weather data provider that aggregates data from national weather services, satellite observations, radar networks, and over 80,000 weather stations worldwide. Forecast data is updated multiple times daily. We convert raw data into clear summaries — wind speed in m/s, pressure in mmHg — so you can plan your day with confidence.