S
M
T
W
T
F
S
26
74°
42°
27
73°
52°
28
62°
47°
29
59°
36°
30
58°
35°
1
55°
34°
2
60°
31°
3
74°
42°
4
83°
44°
5
59°
40°
6
56°
34°
7
66°
31°
8
72°
41°
9
76°
47°
10
69°
35°
11
67°
39°
12
79°
45°
13
69°
44°
14
75°
41°
15
82°
57°
16
85°
61°
17
84°
64°
18
77°
63°
19
73°
47°
20
66°
45°
21
69°
45°
22
70°
51°
23
79°
56°
24
83°
55°
25
86°
59°
26
87°
64°
27
84°
63°
28
84°
58°
29
83°
56°
30
75°
55°
31
76°
56°
1
82°
57°
2
80°
60°
3
81°
61°
4
84°
60°
5
79°
61°
6
78°
65°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Port Byron
Port Byron's May 2026 forecast shows daily high temperatures ranging from 75° to 87°, with overnight lows between 55° and 65°. The average high for May is 81° with an average low of 59°. 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 Port Byron. See also: June | July | August.
