S
M
T
W
T
F
S
30
81°
61°
31
80°
54°
1
79°
53°
2
74°
54°
3
73°
54°
4
74°
53°
5
73°
53°
6
73°
52°
7
74°
52°
8
73°
53°
9
73°
56°
10
72°
52°
11
74°
54°
12
74°
54°
13
77°
53°
14
75°
54°
15
72°
51°
16
71°
51°
17
68°
50°
18
70°
52°
19
69°
50°
20
73°
56°
21
74°
55°
22
Hist. Avg.
74°
55°
23
Hist. Avg.
73°
54°
24
Hist. Avg.
73°
54°
25
Hist. Avg.
73°
54°
26
Hist. Avg.
72°
53°
27
Hist. Avg.
72°
53°
28
Hist. Avg.
72°
52°
29
Hist. Avg.
71°
52°
30
Hist. Avg.
71°
52°
1
Hist. Avg.
70°
51°
2
Hist. Avg.
70°
51°
3
Hist. Avg.
70°
51°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Waterville
Waterville's September 2026 forecast shows daily high temperatures ranging from 68° to 81°, with overnight lows between 50° and 61°. The average high for September is 74° with an average low of 53°. 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 Waterville. See also: October | November | December.
