S
M
T
W
T
F
S
30
70°
53°
31
67°
55°
1
71°
52°
2
74°
56°
3
71°
60°
4
73°
51°
5
74°
53°
6
77°
53°
7
76°
57°
8
76°
56°
9
80°
55°
10
80°
56°
11
75°
56°
12
74°
55°
13
73°
54°
14
76°
53°
15
74°
56°
16
70°
54°
17
76°
55°
18
74°
54°
19
70°
51°
20
71°
56°
21
71°
54°
22
75°
53°
23
70°
53°
24
69°
49°
25
68°
49°
26
69°
50°
27
68°
49°
28
69°
50°
29
70°
48°
30
70°
51°
1
69°
49°
2
70°
51°
3
76°
54°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Watsonville
Watsonville's September 2026 forecast shows daily high temperatures ranging from 68° to 80°, with overnight lows between 48° and 60°. The average high for September is 73° 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 Watsonville. See also: October | November | December.
