S
M
T
W
T
F
S
30
75°
52°
31
76°
53°
1
73°
51°
2
73°
53°
3
74°
54°
4
72°
55°
5
72°
53°
6
73°
52°
7
71°
51°
8
72°
50°
9
70°
50°
10
71°
56°
11
70°
50°
12
71°
49°
13
74°
48°
14
73°
55°
15
73°
54°
16
70°
49°
17
68°
46°
18
70°
47°
19
72°
52°
20
73°
53°
21
73°
52°
22
68°
50°
23
72°
50°
24
70°
47°
25
68°
50°
26
65°
43°
27
70°
44°
28
62°
43°
29
61°
43°
30
61°
42°
1
Hist. Avg.
65°
44°
2
Hist. Avg.
64°
44°
3
Hist. Avg.
64°
43°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Hillsborough
Hillsborough's September 2026 forecast shows daily high temperatures ranging from 61° to 76°, with overnight lows between 42° and 56°. The average high for September is 71° with an average low of 50°. 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 Hillsborough. See also: October | November | December.
