S
M
T
W
T
F
S
30
83°
58°
31
81°
59°
1
82°
60°
2
84°
57°
3
82°
56°
4
80°
56°
5
81°
57°
6
83°
58°
7
85°
58°
8
86°
57°
9
85°
59°
10
85°
60°
11
83°
58°
12
84°
58°
13
85°
57°
14
84°
56°
15
82°
57°
16
82°
57°
17
80°
56°
18
78°
54°
19
79°
55°
20
78°
52°
21
75°
49°
22
76°
49°
23
77°
52°
24
77°
51°
25
79°
52°
26
82°
51°
27
81°
51°
28
81°
50°
29
77°
49°
30
76°
51°
1
81°
52°
2
83°
51°
3
82°
50°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Portal
Portal's September 2026 forecast shows daily high temperatures ranging from 75° to 86°, with overnight lows between 49° and 60°. The average high for September is 81° with an average low of 55°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how September weather will actually feel in Portal. See also: October | November | December.
