5-day weather forecast San Francisco Sep 17, 2026
19°Weather forecast San Francisco tomorrow Sep 17, 2026: sunny, temperature from 16 °C to 19 °C.
Precipitation probability 30%. Wind up to 5.69 m/s (gusts 9.81 m/s). Air humidity 66–85%, atmospheric pressure 762–765 mm Hg, UV index up to 6.4.
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 06:53
Sunset 19:15
Sunset 19:15
First Quarter42% illuminated
Moonrise 14:08 · Moonset 23:11
Moonrise 14:08 · Moonset 23:11
Chart
Table
| Time | Weather | Temperature | Rain chance | Cloud cover | Humidity | Pressure | Wind | UV Index |
|---|---|---|---|---|---|---|---|---|
| 00:00 |  Patchy rain possible | 16 °C | 30% (0.06 mm/hr) | 100% | 81% | 762 mm Hg | WSW 240° 4.5 (6.33) m/s | 0 |
| 01:00 | Patchy rain possible | 16 °C | 30% (0.05 mm/hr) | 100% | 82% | 762 mm Hg | WSW 238° 4.5 (5.92) m/s | 0 |
| 02:00 | Patchy rain possible | 16 °C | 29% (0.05 mm/hr) | 100% | 82% | 762 mm Hg | SW 236° 4.19 (5.42) m/s | 0 |
| 03:00 | Patchy rain possible | 16 °C | 29% (0.05 mm/hr) | 100% | 82% | 762 mm Hg | SW 232° 3.89 (4.92) m/s | 0 |
| 04:00 | Patchy rain possible | 16 °C | 29% (0.05 mm/hr) | 100% | 82% | 763 mm Hg | SW 222° 3.39 (4.31) m/s | 0 |
| 05:00 | Patchy rain possible | 16 °C | 29% (0.05 mm/hr) | 100% | 81% | 763 mm Hg | SSW 212° 3 (3.81) m/s | 0 |
| 06:00 | Patchy rain possible | 16 °C | 26% (0.03 mm/hr) | 99% | 81% | 764 mm Hg | SSW 208° 2.89 (3.61) m/s | 0 |
| 07:00 |  Patchy rain possible | 16 °C | 24% (0.02 mm/hr) | 93% | 81% | 764 mm Hg | SSW 206° 2.69 (3.5) m/s | 0 |
| 08:00 | Patchy rain possible | 16 °C | 19% (0.01 mm/hr) | 78% | 80% | 764 mm Hg | SSW 195° 2.31 (2.72) m/s | 0.1 |
| 09:00 |  Cloudy | 17 °C | 15% | 65% | 77% | 764 mm Hg | SSW 196° 1.89 (2.42) m/s | 0.5 |
| 10:00 |  Partly cloudy | 17 °C | 10% | 36% | 73% | 765 mm Hg | SSW 206° 1.81 (2) m/s | 1.4 |
| 11:00 | Sunny | 18 °C | 6% | 1% | 70% | 765 mm Hg | SW 234° 1.81 (1.81) m/s | 3.6 |
| 12:00 | Sunny | 18 °C | 5% | 0% | 68% | 765 mm Hg | WSW 253° 2.31 (5.31) m/s | 5.5 |
| 13:00 | Sunny | 19 °C | 5% | 0% | 67% | 765 mm Hg | W 260° 3.19 (6.19) m/s | 6.4 |
| 14:00 | Sunny | 19 °C | 5% | 0% | 66% | 765 mm Hg | W 261° 4 (8) m/s | 6.1 |
| 15:00 | Sunny | 19 °C | 5% | 0% | 67% | 764 mm Hg | W 263° 4.81 (9.81) m/s | 4.8 |
| 16:00 | Sunny | 18 °C | 6% | 0% | 70% | 764 mm Hg | W 268° 5.5 (5.5) m/s | 3.1 |
| 17:00 | Sunny | 18 °C | 6% | 0% | 72% | 764 mm Hg | W 270° 5.69 (6.31) m/s | 1.4 |
| 18:00 | Sunny | 18 °C | 7% | 0% | 74% | 764 mm Hg | W 273° 5.61 (6.72) m/s | 0.5 |
| 19:00 | Sunny | 17 °C | 8% | 0% | 78% | 764 mm Hg | W 272° 5.11 (6.33) m/s | 0 |
| 20:00 |  Clear | 17 °C | 9% | 0% | 80% | 764 mm Hg | W 279° 4.69 (6.31) m/s | 0 |
| 21:00 | Clear | 16 °C | 10% | 0% | 83% | 764 mm Hg | WNW 283° 4.19 (6.44) m/s | 0 |
| 22:00 | Clear | 16 °C | 11% | 0% | 84% | 765 mm Hg | WNW 288° 3.61 (6.42) m/s | 0 |
| 23:00 | Clear | 16 °C | 11% | 0% | 85% | 765 mm Hg | W 281° 3 (5.22) 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.