S
M
T
W
T
F
S
30
71°
58°
31
67°
58°
1
71°
61°
2
73°
62°
3
72°
60°
4
72°
58°
5
74°
58°
6
72°
59°
7
83°
56°
8
87°
61°
9
94°
66°
10
85°
60°
11
73°
60°
12
71°
60°
13
71°
59°
14
79°
58°
15
72°
59°
16
71°
58°
17
75°
57°
18
74°
58°
19
72°
59°
20
72°
57°
21
73°
58°
22
74°
60°
23
74°
58°
24
75°
58°
25
76°
59°
26
80°
60°
27
71°
56°
28
70°
52°
29
71°
54°
30
72°
54°
1
77°
56°
2
71°
55°
3
72°
54°
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 70° to 80°, with overnight lows between 52° and 60°. The average high for September is 74° with an average low of 57°. 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.
