S
M
T
W
T
F
S
30
74°
53°
31
76°
51°
1
78°
50°
2
74°
55°
3
66°
59°
4
79°
60°
5
71°
56°
6
70°
51°
7
80°
58°
8
77°
46°
9
64°
61°
10
82°
54°
11
73°
46°
12
74°
54°
13
78°
58°
14
74°
53°
15
70°
54°
16
71°
51°
17
70°
52°
18
66°
50°
19
70°
48°
20
74°
52°
21
63°
51°
22
63°
52°
23
68°
52°
24
72°
51°
25
69°
51°
26
70°
48°
27
64°
45°
28
67°
45°
29
70°
50°
30
71°
50°
1
71°
49°
2
69°
50°
3
67°
49°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Waterville
Waterville's September 2026 forecast shows daily high temperatures ranging from 63° to 82°, with overnight lows between 45° and 61°. The average high for September is 71° with an average low of 51°. 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.
