S
M
T
W
T
F
S
30
68°
55°
31
72°
55°
1
73°
54°
2
73°
53°
3
69°
52°
4
71°
54°
5
70°
48°
6
71°
51°
7
69°
52°
8
71°
52°
9
68°
51°
10
66°
49°
11
65°
46°
12
65°
47°
13
66°
46°
14
65°
51°
15
64°
51°
16
68°
50°
17
67°
51°
18
68°
48°
19
69°
46°
20
63°
50°
21
64°
47°
22
63°
45°
23
63°
44°
24
64°
49°
25
63°
50°
26
64°
48°
27
66°
44°
28
65°
43°
29
63°
42°
30
61°
42°
1
62°
41°
2
61°
44°
3
63°
46°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Barnet
Barnet's September 2026 forecast shows daily high temperatures ranging from 61° to 73°, with overnight lows between 41° and 55°. The average high for September is 66° with an average low of 48°. 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 Barnet. See also: October | November | December.
