5-day weather forecast San Francisco 21-05-2026

Weather forecast San Francisco Thursday, May 21 21.05.2026: sunny, temperature from 12 °C to 20 °C.

No precipitation expected. Wind up to 5 m/s (gusts 8.44 m/s). Air humidity 52–85%, atmospheric pressure 758–759 mm Hg, UV index up to 6.

Sunrise 05:55
Sunset 20:18

Waxing Crescent24% illuminated
Moonrise 10:54 · Moonset 00:50

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← Wed, May 20

Thu, May 21, 2026

Forecast from 12 °C to 20 °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)	13	13	13	12	13	12	13	14	15	16	18	19	19	20	20	19	19	18	17	17	16	16	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 (%)	7	7	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
Rain chance (%)	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	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)	2.11	2.19	1.61	2.31	1.89	1.81	1.31	1.31	0.39	1.5	2.19	2.31	3.19	4.11	5	5	4.89	4.89	4.31	3.69	3.11	2.89	2.69	2.5
Wind gust (m/s)	3.58	3.78	3.28	3.92	3.28	3.69	2.31	2.14	0.69	2.03	2.94	3.81	5.39	6.89	8.44	8.39	8.39	8.33	7.39	6.5	5.56	5.31	5	4.72
Wind direction (°)	SW 227°	SW 231°	WSW 248°	SW 232°	SW 229°	WSW 245°	SW 223°	SSW 210°	NW 318°	SW 220°	SW 233°	WSW 252°	WSW 253°	WSW 254°	WSW 255°	WSW 257°	WSW 258°	W 259°	WSW 258°	WSW 256°	WSW 255°	WSW 249°	WSW 244°	WSW 238°

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 (%)	82	83	75	85	85	76	84	79	65	66	62	53	53	52	52	54	56	58	61	65	68	70	72	74

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)	758	758	759	758	758	759	758	758	759	758	758	759	759	759	759	758	758	758	758	758	758	758	758	758

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	4	4	5	5	5	5	5	5	6	5	5	5	5	5	5	0	0	0

← Wed, May 20

Thu, May 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 →