S
M
T
W
T
F
S
26
92°
76°
27
86°
77°
28
88°
76°
29
85°
75°
30
89°
76°
1
90°
74°
2
90°
73°
3
89°
73°
4
90°
74°
5
89°
75°
6
90°
75°
7
88°
74°
8
85°
76°
9
87°
76°
10
86°
77°
11
87°
73°
12
87°
73°
13
88°
74°
14
85°
73°
15
84°
73°
16
84°
72°
17
85°
72°
18
85°
71°
19
86°
72°
20
84°
73°
21
85°
74°
22
85°
73°
23
86°
72°
24
85°
73°
25
85°
73°
26
86°
72°
27
86°
72°
28
85°
73°
29
85°
73°
30
86°
72°
31
85°
74°
1
85°
73°
2
86°
74°
3
86°
74°
4
87°
73°
5
86°
74°
6
87°
74°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in San Francisco
San Francisco's May 2026 forecast shows daily high temperatures ranging from 84° to 90°, with overnight lows between 71° and 77°. The average high for May is 86° with an average low of 73°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how May weather will actually feel in San Francisco. See also: June | July | August.
