S
M
T
W
T
F
S
30
79°
69°
31
82°
71°
1
86°
72°
2
93°
71°
3
86°
63°
4
82°
60°
5
76°
61°
6
77°
62°
7
80°
62°
8
77°
63°
9
75°
59°
10
74°
56°
11
74°
48°
12
77°
62°
13
78°
61°
14
77°
62°
15
76°
61°
16
77°
61°
17
76°
60°
18
71°
60°
19
76°
61°
20
77°
62°
21
77°
62°
22
76°
61°
23
77°
61°
24
76°
60°
25
75°
59°
26
74°
58°
27
75°
59°
28
75°
58°
29
74°
57°
30
71°
56°
1
71°
56°
2
72°
55°
3
73°
56°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Harrow
Harrow's September 2026 forecast shows daily high temperatures ranging from 71° to 93°, with overnight lows between 48° and 72°. The average high for September is 77° with an average low of 61°. 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 Harrow. See also: October | November | December.
