S
M
T
W
T
F
S
30
96°
72°
31
99°
73°
1
100°
79°
2
100°
82°
3
99°
82°
4
100°
76°
5
101°
73°
6
92°
67°
7
89°
65°
8
97°
75°
9
96°
79°
10
96°
70°
11
89°
68°
12
91°
69°
13
94°
71°
14
88°
65°
15
86°
65°
16
88°
63°
17
81°
60°
18
79°
62°
19
80°
65°
20
83°
65°
21
83°
66°
22
80°
64°
23
81°
60°
24
81°
63°
25
80°
63°
26
80°
57°
27
72°
52°
28
71°
51°
29
69°
51°
30
73°
52°
1
70°
54°
2
74°
58°
3
68°
56°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Berkeley
Berkeley's September 2026 forecast shows daily high temperatures ranging from 68° to 101°, with overnight lows between 51° and 79°. The average high for September is 84° with an average low of 64°. 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 Berkeley. See also: October | November | December.
