5-day weather forecast San Francisco Sep 19, 2026

17°14° · Overcast

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

MinorSep 15, 08:42 PM — Sep 16, 04:45 AMTranslate with Google

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.

MinorSep 15, 02:17 PM — Sep 15, 10:30 PMTranslate with Google

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

First Quarter63% illuminated
Moonrise 15:46 · Moonset 00:06

Chart

Table

← Fri, Sep 18

Sat, Sep 19, 2026

Sun, Sep 20 →

Forecast from 14 °C to 17 °C and precipitation

Temperature & Precipitation
Time	00:00	01:00	02:00	03:00	04:00	05:00	06:00	07:00	08:00	09:00	10:00	11:00	12:00	13:00	14:00	15:00	16:00	17:00	18:00	19:00	20:00	21:00	22:00	23:00
Temperature (°C)	15	15	15	15	15	14	15	14	15	15	15	16	16	16	16	17	17	17	16	15	15	15	15	15
Precipitation (mm/hr)	0	0	0	0	0	0	0	0	0	0	0.01	0	0	0	0	0	0	0	0	0	0	0	0	0

Cloud cover and precipitation probability

Cloud cover & Rain chance
Time	00:00	01:00	02:00	03:00	04:00	05:00	06:00	07:00	08:00	09:00	10:00	11:00	12:00	13:00	14:00	15:00	16:00	17:00	18:00	19:00	20:00	21:00	22:00	23:00
Cloud cover (%)	25	31	37	41	43	51	62	70	88	92	70	68	100	98	98	25	18	18	100	100	26	100	100	67
Rain chance (%)	15	16	17	17	18	19	21	22	26	26	20	17	23	23	24	11	10	10	25	27	15	28	28	21

Wind speed and direction

Wind & Wind gust
Time	00:00	01:00	02:00	03:00	04:00	05:00	06:00	07:00	08:00	09:00	10:00	11:00	12:00	13:00	14:00	15:00	16:00	17:00	18:00	19:00	20:00	21:00	22:00	23:00
Wind (m/s)	4.69	4.11	4	3.89	3.89	3.61	4.11	3.39	3.39	3.61	4	3.61	4.31	5.11	5.89	6.31	6.81	6.69	6.69	6.31	5.69	5.89	5.61	5.61
Wind gust (m/s)	6.42	5.83	5.69	5.42	5.19	4.81	5.11	4.19	4.11	4.11	4.31	3.81	4.39	5.22	6.42	7.31	8.31	8.5	8.72	8.33	7.19	7.81	7.83	7.11
Wind direction (°)	W 264°	W 263°	W 261°	W 260°	W 260°	WSW 256°	WSW 256°	WSW 250°	WSW 240°	WSW 239°	WSW 242°	WSW 246°	WSW 250°	WSW 249°	WSW 255°	W 260°	W 263°	W 268°	W 266°	W 274°	W 280°	W 276°	W 272°	W 276°

Air humidity

Humidity
Time	00:00	01:00	02:00	03:00	04:00	05:00	06:00	07:00	08:00	09:00	10:00	11:00	12:00	13:00	14:00	15:00	16:00	17:00	18:00	19:00	20:00	21:00	22:00	23:00
Humidity (%)	89	90	89	89	89	89	89	89	88	86	83	80	78	80	80	80	80	80	83	86	88	87	88	88

Atmospheric pressure

Pressure
Time	00:00	01:00	02:00	03:00	04:00	05:00	06:00	07:00	08:00	09:00	10:00	11:00	12:00	13:00	14:00	15:00	16:00	17:00	18:00	19:00	20:00	21:00	22:00	23:00
Pressure (mm Hg)	763	762	762	762	762	762	762	762	762	763	763	763	762	762	761	761	761	761	761	761	761	761	761	761

Ultraviolet index

UV Index
Time	00:00	01:00	02:00	03:00	04:00	05:00	06:00	07:00	08:00	09:00	10:00	11:00	12:00	13:00	14:00	15:00	16:00	17:00	18:00	19:00	20:00	21:00	22:00	23:00
UV Index	0	0	0	0	0	0	0	0	0.2	1	2.4	4.1	5.7	6.6	6.4	5	3.2	1.4	0.4	0	0	0	0	0

Air quality & pollen

Air quality is available for the first three days only.

← Fri, Sep 18

Sat, Sep 19, 2026

Sun, Sep 20 →

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.

Learn more about our methodology →