S
M
T
W
T
F
S
30
69°
52°
31
71°
54°
1
77°
53°
2
76°
51°
3
73°
45°
4
74°
51°
5
75°
44°
6
74°
43°
7
67°
48°
8
65°
50°
9
66°
47°
10
67°
42°
11
65°
50°
12
72°
41°
13
68°
44°
14
70°
46°
15
69°
49°
16
65°
40°
17
70°
39°
18
63°
40°
19
Hist. Avg.
62°
40°
20
Hist. Avg.
62°
39°
21
Hist. Avg.
62°
39°
22
Hist. Avg.
61°
39°
23
Hist. Avg.
61°
38°
24
Hist. Avg.
61°
38°
25
Hist. Avg.
60°
38°
26
Hist. Avg.
60°
37°
27
Hist. Avg.
60°
37°
28
Hist. Avg.
59°
37°
29
Hist. Avg.
59°
37°
30
Hist. Avg.
58°
36°
1
Hist. Avg.
58°
36°
2
Hist. Avg.
58°
36°
3
Hist. Avg.
57°
35°
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 63° to 77°, with overnight lows between 39° and 54°. The average high for September is 70° with an average low of 46°. 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.
