S
M
T
W
T
F
S
30
80°
62°
31
82°
62°
1
83°
60°
2
83°
55°
3
80°
60°
4
81°
61°
5
80°
60°
6
78°
60°
7
75°
59°
8
75°
52°
9
76°
50°
10
74°
58°
11
75°
59°
12
80°
58°
13
80°
59°
14
78°
58°
15
79°
58°
16
80°
58°
17
Hist. Avg.
78°
55°
18
Hist. Avg.
77°
54°
19
Hist. Avg.
77°
54°
20
Hist. Avg.
76°
53°
21
Hist. Avg.
76°
53°
22
Hist. Avg.
76°
53°
23
Hist. Avg.
75°
52°
24
Hist. Avg.
75°
52°
25
Hist. Avg.
74°
52°
26
Hist. Avg.
74°
51°
27
Hist. Avg.
74°
51°
28
Hist. Avg.
73°
50°
29
Hist. Avg.
73°
50°
30
Hist. Avg.
72°
50°
1
Hist. Avg.
72°
49°
2
Hist. Avg.
71°
49°
3
Hist. Avg.
71°
48°
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 74° to 83°, with overnight lows between 50° and 62°. The average high for September is 79° with an average low of 58°. 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.
