S
M
T
W
T
F
S
26
61°
46°
27
62°
48°
28
62°
52°
29
64°
54°
30
62°
53°
1
62°
51°
2
63°
52°
3
63°
50°
4
64°
51°
5
63°
49°
6
63°
51°
7
64°
49°
8
64°
53°
9
65°
53°
10
64°
49°
11
63°
49°
12
64°
50°
13
63°
54°
14
70°
55°
15
70°
53°
16
64°
51°
17
63°
50°
18
68°
55°
19
71°
55°
20
71°
54°
21
67°
55°
22
64°
54°
23
65°
54°
24
71°
56°
25
65°
50°
26
67°
51°
27
71°
55°
28
72°
51°
29
70°
52°
30
69°
50°
31
68°
52°
1
69°
53°
2
72°
56°
3
73°
56°
4
72°
55°
5
73°
55°
6
72°
57°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in South San Francisco
South San Francisco's May 2026 forecast shows daily high temperatures ranging from 61° to 73°, with overnight lows between 46° and 57°. The average high for May is 67° with an average low of 52°. 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 South San Francisco. See also: June | July | August.
