S
M
T
W
T
F
S
30
80°
54°
31
77°
64°
1
87°
68°
2
70°
66°
3
88°
67°
4
87°
68°
5
81°
62°
6
80°
58°
7
80°
52°
8
82°
51°
9
85°
56°
10
87°
67°
11
82°
56°
12
81°
67°
13
84°
64°
14
81°
53°
15
77°
56°
16
81°
60°
17
84°
61°
18
81°
57°
19
74°
52°
20
72°
51°
21
70°
51°
22
72°
49°
23
73°
54°
24
76°
50°
25
67°
46°
26
68°
48°
27
73°
54°
28
76°
51°
29
70°
46°
30
71°
53°
1
72°
50°
2
67°
46°
3
70°
52°
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 67° to 84°, with overnight lows between 46° and 67°. The average high for September is 75° 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 Hillsborough. See also: October | November | December.
