S
M
T
W
T
F
S
26
79°
52°
27
79°
41°
28
81°
43°
29
77°
50°
30
73°
52°
1
73°
50°
2
72°
50°
3
79°
54°
4
81°
50°
5
75°
52°
6
73°
45°
7
81°
37°
8
N/A
9
85°
57°
10
86°
57°
11
84°
58°
12
83°
60°
13
83°
56°
14
86°
54°
15
92°
45°
16
91°
47°
17
91°
49°
18
90°
54°
19
88°
47°
20
91°
45°
21
91°
46°
22
85°
44°
23
83°
53°
24
85°
54°
25
83°
53°
26
81°
53°
27
80°
52°
28
80°
55°
29
79°
54°
30
82°
53°
31
80°
51°
1
79°
53°
2
81°
55°
3
86°
56°
4
89°
58°
5
88°
57°
6
85°
56°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
May Weather in Portal
Portal's May 2026 forecast shows daily high temperatures ranging from 79° to 92°, with overnight lows between 44° and 60°. The average high for May is 85° 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 Portal. See also: June | July | August.
