S
M
T
W
T
F
S
26
84°
68°
27
84°
68°
28
88°
70°
29
86°
68°
30
84°
70°
1
86°
72°
2
86°
73°
3
88°
72°
4
86°
73°
5
86°
70°
6
86°
72°
7
84°
68°
8
88°
68°
9
86°
68°
10
86°
68°
11
88°
73°
12
88°
75°
13
90°
75°
14
88°
75°
15
88°
70°
16
90°
73°
17
90°
75°
18
90°
79°
19
90°
77°
20
90°
79°
21
88°
77°
22
88°
77°
23
90°
72°
24
91°
74°
25
91°
73°
26
89°
75°
27
88°
75°
28
88°
74°
29
89°
73°
30
90°
74°
31
93°
71°
1
92°
72°
2
91°
75°
3
90°
75°
4
90°
76°
5
95°
72°
6
95°
72°
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 88° to 95°, with overnight lows between 71° and 76°. The average high for May is 91° with an average low of 74°. 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.
