S
M
T
W
T
F
S
26
62°
29°
27
63°
29°
28
70°
29°
29
74°
30°
30
78°
33°
1
81°
38°
2
79°
45°
3
80°
47°
4
81°
40°
5
81°
43°
6
85°
39°
7
85°
39°
8
80°
38°
9
86°
36°
10
86°
42°
11
88°
45°
12
89°
45°
13
70°
44°
14
79°
34°
15
72°
38°
16
61°
40°
17
64°
39°
18
73°
34°
19
78°
36°
20
82°
39°
21
85°
43°
22
88°
49°
23
88°
50°
24
89°
48°
25
83°
44°
26
62°
39°
27
67°
43°
28
77°
48°
29
80°
42°
30
76°
40°
31
81°
48°
1
85°
50°
2
90°
52°
3
89°
53°
4
92°
54°
5
71°
45°
6
72°
40°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Siskiyou County Airport
Siskiyou County Airport's May 2026 forecast shows daily high temperatures ranging from 62° to 92°, with overnight lows between 39° and 54°. The average high for May is 81° with an average low of 47°. 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 Siskiyou County Airport. See also: June | July | August.
