S
M
T
W
T
F
S
30
99°
75°
31
94°
75°
1
85°
77°
2
88°
78°
3
92°
75°
4
94°
74°
5
90°
75°
6
93°
74°
7
N/A
8
93°
73°
9
90°
73°
10
88°
74°
11
90°
73°
12
92°
73°
13
92°
75°
14
91°
73°
15
92°
74°
16
89°
70°
17
90°
72°
18
91°
69°
19
87°
71°
20
88°
68°
21
89°
72°
22
88°
72°
23
89°
71°
24
89°
72°
25
88°
71°
26
88°
71°
27
87°
70°
28
87°
70°
29
86°
69°
30
86°
70°
1
83°
62°
2
79°
61°
3
79°
61°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Lake Arthur
Lake Arthur's September 2026 forecast shows daily high temperatures ranging from 79° to 93°, with overnight lows between 61° and 75°. The average high for September is 88° with an average low of 70°. 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 Lake Arthur. See also: October | November | December.
