S
M
T
W
T
F
S
30
82°
54°
31
78°
53°
1
76°
56°
2
76°
55°
3
77°
55°
4
76°
53°
5
76°
53°
6
74°
57°
7
75°
53°
8
76°
53°
9
76°
52°
10
75°
52°
11
75°
51°
12
74°
51°
13
75°
52°
14
74°
56°
15
77°
57°
16
79°
56°
17
81°
55°
18
80°
52°
19
79°
55°
20
Hist. Avg.
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21
Hist. Avg.
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22
Hist. Avg.
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23
Hist. Avg.
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24
Hist. Avg.
N/A
25
Hist. Avg.
N/A
26
Hist. Avg.
N/A
27
Hist. Avg.
N/A
28
Hist. Avg.
N/A
29
Hist. Avg.
N/A
30
Hist. Avg.
N/A
1
Hist. Avg.
N/A
2
Hist. Avg.
N/A
3
Hist. Avg.
N/A
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in LaSalle
LaSalle's September 2026 forecast shows daily high temperatures ranging from 74° to 82°, with overnight lows between 51° and 57°. The average high for September is 77° with an average low of 54°. 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 LaSalle. See also: October | November | December.
