S
M
T
W
T
F
S
26
88°
45°
27
80°
47°
28
84°
44°
29
75°
42°
30
69°
50°
1
47°
36°
2
68°
39°
3
76°
55°
4
80°
55°
5
74°
43°
6
68°
40°
7
80°
46°
8
80°
49°
9
83°
50°
10
79°
49°
11
82°
51°
12
82°
49°
13
84°
51°
14
82°
48°
15
83°
52°
16
83°
53°
17
84°
53°
18
85°
52°
19
85°
54°
20
87°
55°
21
81°
52°
22
82°
54°
23
88°
55°
24
84°
51°
25
78°
47°
26
79°
47°
27
80°
48°
28
83°
54°
29
89°
57°
30
91°
58°
31
90°
58°
1
83°
57°
2
86°
58°
3
91°
58°
4
92°
57°
5
92°
59°
6
89°
59°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Santa Rosa
Santa Rosa's May 2026 forecast shows daily high temperatures ranging from 47° to 92°, with overnight lows between 36° and 59°. The average high for May is 82° 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 Santa Rosa. See also: June | July | August.
