S
M
T
W
T
F
S
26
58°
46°
27
65°
46°
28
71°
46°
29
77°
49°
30
82°
51°
1
81°
54°
2
75°
53°
3
66°
51°
4
56°
49°
5
71°
49°
6
73°
54°
7
82°
54°
8
80°
54°
9
84°
56°
10
86°
57°
11
91°
57°
12
84°
57°
13
74°
51°
14
83°
52°
15
80°
54°
16
71°
50°
17
66°
47°
18
80°
57°
19
85°
52°
20
87°
55°
21
90°
57°
22
92°
60°
23
80°
54°
24
82°
51°
25
79°
48°
26
76°
46°
27
77°
51°
28
79°
51°
29
80°
50°
30
80°
45°
31
80°
49°
1
86°
51°
2
92°
55°
3
89°
52°
4
90°
54°
5
81°
52°
6
81°
52°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Upper Lake
Upper Lake's May 2026 forecast shows daily high temperatures ranging from 76° to 92°, with overnight lows between 45° and 55°. The average high for May is 82° with an average low of 51°. 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 Upper Lake. See also: June | July | August.
