S
M
T
W
T
F
S
26
76°
40°
27
69°
56°
28
61°
51°
29
60°
41°
30
63°
35°
1
54°
40°
2
57°
40°
3
69°
45°
4
76°
53°
5
57°
42°
6
57°
41°
7
57°
42°
8
64°
45°
9
67°
49°
10
66°
47°
11
69°
49°
12
71°
51°
13
72°
54°
14
74°
51°
15
73°
50°
16
76°
58°
17
74°
57°
18
71°
56°
19
76°
58°
20
74°
58°
21
72°
49°
22
68°
48°
23
68°
50°
24
70°
50°
25
69°
51°
26
69°
51°
27
70°
52°
28
71°
52°
29
71°
56°
30
74°
61°
31
77°
58°
1
73°
55°
2
75°
61°
3
78°
62°
4
79°
62°
5
80°
64°
6
82°
64°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Pontiac
Pontiac's May 2026 forecast shows daily high temperatures ranging from 57° to 82°, with overnight lows between 40° and 64°. The average high for May is 71° with an average low of 53°. 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 Pontiac. See also: June | July | August.
