S
M
T
W
T
F
S
30
100°
78°
31
100°
80°
1
99°
77°
2
100°
80°
3
100°
82°
4
99°
81°
5
98°
80°
6
99°
79°
7
100°
79°
8
100°
81°
9
98°
74°
10
100°
79°
11
99°
80°
12
98°
82°
13
98°
82°
14
98°
82°
15
98°
80°
16
98°
79°
17
98°
76°
18
94°
78°
19
96°
75°
20
99°
74°
21
98°
75°
22
N/A
23
97°
73°
24
98°
74°
25
97°
75°
26
98°
76°
27
99°
73°
28
98°
75°
29
97°
80°
30
99°
82°
1
94°
79°
2
91°
75°
3
85°
74°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Weslaco
Weslaco's September 2026 forecast shows daily high temperatures ranging from 85° to 94°, with overnight lows between 74° and 79°. The average high for September is 90° with an average low of 76°. 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 Weslaco. See also: October | November | December.
