5-day weather forecast San Francisco 21-03-2026

Weather forecast San Francisco Saturday 21 March 21.03.2026: overcast, temperature from 12 °C to 18 °C.

No precipitation expected. Wind up to 4.39 m/s (gusts 6.67 m/s). Air humidity 60–84%, atmospheric pressure 760–761 mm Hg, UV index up to 5.

Sunrise 07:19
Sunset 19:19

Chart

Table

Type of temperature:

°C

°F

← Fri, 20 Mar

Sat, 21 Mar, 2026

Sun, 22 Mar →

Forecast from 12 °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)	14	14	14	14	14	14	14	14	14	15	16	16	17	17	18	18	17	17	16	15	14	13	13	12
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

Cloud cover
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 (%)	14	100	96	17	96	99	64	33	100	54	100	75	100	38	32	36	33	33	99	97	74	15	9	0

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)	1.89	1.39	1.31	1.81	2	1.89	1.89	1.31	1.11	1.19	1.61	1.39	2.61	3.11	4.31	4.31	4.31	4.39	4.31	3.61	2.89	2.69	2.61	1.61
Wind gust (m/s)	3.64	2.72	2.47	3.36	3.75	3.39	3.33	2.33	1.89	1.89	2.31	2.03	3.92	4.61	6.28	6.58	6.67	6.64	6.47	5.58	4.53	4.19	4.03	2.44

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 (%)	78	80	80	81	84	83	84	84	83	79	74	69	67	65	64	62	60	61	63	67	70	72	75	76

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	761	761	760	760	761	761	761	761	761	761	761	761	761	760	760	760	760	760	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	3	4	4	4	4	5	5	5	5	5	4	3	0	0	0	0

← Fri, 20 Mar

Sat, 21 Mar, 2026

Sun, 22 Mar →

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 →