5-day weather forecast San Francisco 21-07-2026

Weather forecast San Francisco Tuesday, July 21 21.07.2026: patchy rain possible, temperature from 15 °C to 25 °C.

Precipitation probability 55%. Wind up to 5.5 m/s (gusts 9.81 m/s). Air humidity 55–88%, atmospheric pressure 759–761 mm Hg, UV index up to 6.

Sunrise 06:04
Sunset 20:27

First Quarter53% illuminated
Moonrise 14:15 · Moonset 00:02

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Table

← Mon, Jul 20

Tue, Jul 21, 2026

Forecast from 15 °C to 25 °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	16	15	15	16	16	16	17	18	19	21	21	22	24	25	24	24	24	22	21	20	19	19	19
Precipitation (mm/hr)	0	0	0	0	0	0.12	0.29	0.1	0.75	0.46	0.07	0	0	0	0	0	0	0	0	0	0.01	0	0	0.01

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 (%)	45	25	29	20	19	80	78	89	86	86	70	46	33	20	8	8	9	10	30	52	73	81	89	97
Rain chance (%)	14	11	11	10	10	29	39	31	55	44	17	8	6	4	3	3	3	3	6	10	16	19	23	29

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)	1.61	1.5	1.5	1.69	1.11	1.39	1.31	0.81	0.19	0.31	0.19	0.39	1.19	2.11	2.89	3.81	4.61	5.5	5.19	4.81	4.5	4.11	3.69	3.31
Wind gust (m/s)	2.97	2.83	2.89	3.25	2.17	2.75	2.53	1.5	0.39	0.53	0.33	0.72	2.19	3.69	5.19	6.69	8.31	9.81	9.11	8.39	7.75	7	6.19	5.42
Wind direction (°)	W 267°	WSW 253°	W 274°	WSW 256°	W 279°	WSW 242°	SW 231°	SW 233°	SE 144°	SE 127°	ENE 67°	NW 312°	WNW 297°	WNW 282°	W 268°	W 261°	WSW 255°	WSW 248°	WSW 250°	WSW 251°	WSW 253°	WSW 258°	W 264°	W 269°

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	79	79	79	79	79	82	81	77	73	68	65	62	58	55	55	56	56	63	69	76	80	84	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)	759	759	759	759	759	759	760	760	760	761	760	761	760	760	760	759	759	759	759	760	760	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	4	4	4	5	6	6	6	6	6	6	6	5	6	4	0	0	0

← Mon, Jul 20

Tue, Jul 21, 2026

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 →