5-day weather forecast San Francisco Sep 16, 2026

17°15° · Overcast

Weather forecast San Francisco tomorrow Sep 16, 2026: overcast, temperature from 15 °C to 17 °C.

Precipitation probability 26%. Wind up to 7.5 m/s (gusts 9.11 m/s). Air humidity 75–87%, atmospheric pressure 759–762 mm Hg, UV index up to 6.7.

Weather Alerts

MinorSep 14, 08:32 PM — Sep 15, 04:45 AMTranslate with Google

Small Craft Advisory issued September 14 at 8:32PM PDT until September 16 at 3:00AM PDT by NWS San Francisco CA

Small Craft Advisory

* WHAT...Northwest winds 15 to 25 kt with gusts up to 30 kt and seas 8 to 11 ft. * WHERE...Waters from Point Reyes to Pigeon Point 10-60 NM. * WHEN...Until 3 AM PDT Wednesday. * IMPACTS...Conditions will be hazardous to small craft.

Inexperienced mariners, especially those operating smaller vessels, should avoid navigating in hazardous conditions.

MinorSep 14, 02:42 PM — Sep 14, 10:45 PMTranslate with Google

Small Craft Advisory issued September 14 at 2:42PM PDT until September 15 at 3:00PM PDT by NWS San Francisco CA

Small Craft Advisory

* WHAT...Northwest winds 15 to 25 kt with gusts up to 30 kt and seas 8 to 11 ft. * WHERE...Waters from Point Reyes to Pigeon Point 10-60 NM. * WHEN...Until 3 PM PDT Tuesday. * 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 06:52
Sunset 19:16

First Quarter32% illuminated
Moonrise 13:07 · Moonset 22:22

Chart

Table

← Tue, Sep 15

Wed, Sep 16, 2026

Thu, Sep 17 →

Forecast from 15 °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	15	15	15	15	15	16	17	17	16	16	16	16	16	16	16	16	16	16	16
Precipitation (mm/hr)	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0.01	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 (%)	22	22	26	29	18	19	31	28	100	100	84	100	100	100	100	100	100	100	100	51	67	67	80	75
Rain chance (%)	13	13	13	14	13	13	15	15	26	25	20	21	21	22	23	24	23	23	24	15	18	17	20	18

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)	5.19	5.69	5.5	5	4.81	4.69	4.81	4.61	4.5	4.61	4.89	4.89	5.89	6.39	6.19	7.19	7.5	7.39	6.81	6.31	5.89	5.69	5.69	5.61
Wind gust (m/s)	6.33	6.89	6.89	6.69	6.33	6.5	6.72	6.5	6.31	5.83	5.72	5.5	6.39	6.72	7.11	8.42	9.11	9.11	8.44	7.72	7.11	6.81	6.94	6.83
Wind direction (°)	SW 222°	SW 216°	SSW 212°	SSW 201°	SSW 200°	SSW 201°	SSW 201°	SSW 203°	SSW 203°	SSW 204°	SSW 206°	SW 217°	SW 223°	SW 232°	WSW 244°	WSW 254°	W 267°	W 272°	W 269°	W 268°	W 265°	W 261°	W 261°	W 263°

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 (%)	86	85	85	86	86	87	87	87	85	82	79	76	75	77	78	81	79	79	81	81	81	80	80	79

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)	759	759	759	759	759	759	760	760	761	761	761	761	761	761	761	761	761	761	761	761	761	762	762	762

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	0.3	1.1	2.6	4.3	5.9	6.7	6.4	5	3.2	1.5	0.5	0	0	0	0	0

Air quality & pollen

Air quality
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
PM2.5 (µg/m³)	13.2	12.8	12.1	11.5	10.9	10.2	10	9.9	9.7	9.8	9.8	9.8	9.7	9.7	9.8	9.5	9.3	9.3	9.4	9.7	9.7	10.3	11.1	11.8
PM10 (µg/m³)	20.4	19.8	18.8	18	17.1	16	15.5	15.4	15.1	15.3	15.3	15.3	15	15.1	15.3	14.8	14.6	14.6	14.8	15.1	14.7	15.5	16.6	17.9
Ozone (O₃) (µg/m³)	65	66	66	65	63	62	61	61	62	64	66	68	70	71	72	72	71	71	72	73	74	75	77	78
NO₂ (µg/m³)	6.9	5.6	4.6	4.1	3.9	3.8	3.8	3.9	3.8	3.5	3.1	2.7	2.4	2.2	2.1	2.1	2.3	2.6	3.2	4.1	4.8	5.3	5.7	5.9
SO₂ (µg/m³)	0.9	0.9	0.9	0.9	0.8	0.8	0.8	0.9	0.9	0.9	0.8	0.8	0.8	0.8	0.8	0.8	0.7	0.7	0.7	0.7	0.7	0.8	0.8	0.9
CO (µg/m³)	130	125	121	118	115	113	113	115	116	117	118	118	118	117	116	116	116	117	118	120	122	124	125	127

← Tue, Sep 15

Wed, Sep 16, 2026

Thu, Sep 17 →

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 →