5-day weather forecast San Francisco 28-08-2026

Weather forecast San Francisco Friday, August 28 28.08.2026: overcast, temperature from 15 °C to 18 °C.

Precipitation probability 28%. Wind up to 7.11 m/s (gusts 9.53 m/s). Air humidity 71–88%, atmospheric pressure 760–762 mm Hg, UV index up to 5.

Weather Alerts

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MinorAug 26, 02:50 AM — Aug 26, 11:00 AMTranslate with Google

Small Craft Advisory issued August 26 at 2:50AM PDT until August 28 at 9:00AM PDT by NWS San Francisco CA

Small Craft Advisory

* WHAT...Northwest winds 15 to 25 kt with gusts up to 35 kt. * WHERE...Waters from Point Reyes to Pigeon Point 10-60 NM. * WHEN...Until 9 AM PDT Friday. * IMPACTS...Conditions will be hazardous to small craft.

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

MinorAug 26, 08:28 AM — Aug 26, 04:30 PMTranslate with Google

Small Craft Advisory issued August 26 at 8:28AM PDT until August 28 at 9:00AM PDT by NWS San Francisco CA

Small Craft Advisory

* WHAT...Northwest winds 15 to 25 kt with occasional gusts up to 35 kt. * WHERE...Waters from Point Reyes to Pigeon Point 10-60 NM. * WHEN...Until 9 AM PDT Friday. * 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 06:36
Sunset 19:45

Full Moon98% illuminated
Moonrise 20:05 · Moonset 07:15

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Table

← Thu, Aug 27

Fri, Aug 28, 2026

Sat, Aug 29 →

Forecast from 15 °C to 18 °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)	16	16	16	15	16	16	15	15	15	15	15	16	16	17	17	17	18	17	17	16	15	15	15	15
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	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 (%)	100	100	100	100	100	100	100	100	100	100	100	91	100	9	10	15	15	15	14	12	5	3	7	5
Rain chance (%)	23	24	25	26	25	26	28	28	27	27	27	23	22	8	7	7	7	7	9	10	12	12	12	12

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)	6.11	5.69	4	4.69	2	3.61	3.89	4	3.39	4.39	4.31	4.19	4.5	5.39	5.61	6.39	7.11	7.11	6.39	5.61	4.81	4.89	5.39	5.89
Wind gust (m/s)	8.22	8	6.22	7.11	3.86	4.83	5.19	5.14	4.11	5.42	5.31	4.72	4.89	5.92	6.83	7.81	9.03	9.53	9.33	8.03	7.22	7.5	7.92	8.53
Wind direction (°)	SW 235°	W 263°	W 268°	W 275°	WSW 245°	WSW 238°	WSW 248°	WSW 252°	WSW 245°	WSW 249°	W 260°	WSW 241°	WSW 250°	WSW 255°	W 260°	W 261°	W 269°	W 277°	W 280°	W 280°	W 277°	W 275°	W 272°	W 275°

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 (%)	80	81	82	84	82	84	87	88	86	85	85	82	78	75	74	71	71	72	77	81	85	86	87	87

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)	761	761	760	760	760	760	761	761	761	761	761	762	762	762	762	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	3	4	4	4	4	4	5	5	5	5	5	5	5	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)	8.9	8.4	8.1	8.1	8.1	8.1	8	7.9	7.9	7.9	7.9	7.7	7.6	7.6	7.9	8.1	8.1	8.1	8.1	8.2	8.3	8.4	8.4	8.4
PM10 (µg/m³)	13.4	12.6	12.2	12.3	12.4	12.6	12.5	12.2	12.2	12	11.8	11.7	11.5	11.5	11.8	12.2	12.2	12.3	12.3	12.5	12.7	12.8	12.8	12.7
Ozone (O₃) (µg/m³)	37	36	35	35	36	37	36	35	35	36	37	39	42	44	46	46	44	42	40	37	36	36	38	39
NO₂ (µg/m³)	10.4	10.2	9.7	8.6	7.2	6.2	6	6.2	6.4	6.4	6.3	6	5.2	4.2	3.6	3.7	4.1	4.8	5.9	7.1	7.9	7.8	7.2	6.6
SO₂ (µg/m³)	0.8	0.7	0.7	0.7	0.8	0.8	0.8	0.9	0.9	0.9	0.9	0.9	0.9	0.9	0.9	0.9	0.9	0.9	0.9	0.8	0.8	0.8	0.8	0.8
CO (µg/m³)	122	116	110	106	102	101	103	108	110	108	103	99	97	96	96	97	98	99	100	102	102	101	98	96

← Thu, Aug 27

Fri, Aug 28, 2026

Sat, Aug 29 →

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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.

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