S
M
T
W
T
F
S
26
59°
39°
27
71°
36°
28
55°
49°
29
54°
42°
30
45°
35°
1
42°
31°
2
42°
30°
3
55°
30°
4
71°
42°
5
68°
50°
6
50°
40°
7
50°
33°
8
52°
32°
9
59°
44°
10
56°
39°
11
50°
32°
12
61°
32°
13
59°
40°
14
47°
41°
15
62°
44°
16
73°
55°
17
76°
54°
18
83°
63°
19
82°
55°
20
66°
46°
21
64°
43°
22
64°
44°
23
65°
48°
24
62°
49°
25
69°
51°
26
68°
47°
27
66°
52°
28
67°
51°
29
67°
53°
30
69°
52°
31
67°
49°
1
66°
44°
2
66°
45°
3
67°
45°
4
67°
47°
5
71°
54°
6
76°
56°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Olean
Olean's May 2026 forecast shows daily high temperatures ranging from 47° to 83°, with overnight lows between 40° and 63°. The average high for May is 68° with an average low of 49°. 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 Olean. See also: June | July | August.
