S
M
T
W
T
F
S
30
78°
57°
31
82°
59°
1
82°
51°
2
80°
50°
3
73°
51°
4
76°
54°
5
78°
60°
6
80°
55°
7
80°
50°
8
73°
54°
9
72°
58°
10
72°
58°
11
77°
56°
12
76°
55°
13
71°
55°
14
69°
49°
15
70°
48°
16
69°
46°
17
69°
51°
18
70°
51°
19
73°
53°
20
70°
55°
21
73°
52°
22
70°
44°
23
67°
50°
24
66°
53°
25
70°
47°
26
64°
47°
27
70°
51°
28
68°
48°
29
63°
50°
30
Hist. Avg.
65°
44°
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
*Temporarily Unavailable
September Weather in Hillsborough
Hillsborough's September 2026 forecast shows daily high temperatures ranging from 63° to 82°, with overnight lows between 44° and 60°. The average high for September is 73° with an average low of 52°. 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.
