S
M
T
W
T
F
S
30
83°
66°
31
79°
61°
1
75°
60°
2
75°
60°
3
74°
61°
4
75°
62°
5
75°
67°
6
76°
67°
7
78°
66°
8
81°
65°
9
82°
64°
10
79°
65°
11
82°
66°
12
83°
65°
13
81°
65°
14
79°
63°
15
81°
55°
16
76°
54°
17
72°
54°
18
72°
55°
19
73°
59°
20
72°
61°
21
74°
61°
22
72°
60°
23
76°
61°
24
78°
60°
25
78°
60°
26
79°
61°
27
78°
58°
28
78°
50°
29
76°
50°
30
65°
55°
1
67°
53°
2
68°
56°
3
67°
52°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Leonardo
Leonardo's September 2026 forecast shows daily high temperatures ranging from 65° to 83°, with overnight lows between 50° and 67°. The average high for September is 76° with an average low of 60°. 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 Leonardo. See also: October | November | December.