S
M
T
W
T
F
S
30
65°
54°
31
65°
50°
1
64°
49°
2
63°
54°
3
63°
48°
4
67°
48°
5
63°
49°
6
65°
50°
7
66°
51°
8
65°
53°
9
67°
50°
10
64°
53°
11
65°
53°
12
64°
52°
13
66°
52°
14
65°
51°
15
66°
51°
16
64°
50°
17
61°
51°
18
61°
51°
19
63°
45°
20
59°
46°
21
60°
44°
22
59°
45°
23
60°
49°
24
62°
51°
25
60°
52°
26
62°
51°
27
62°
50°
28
61°
49°
29
58°
46°
30
57°
45°
1
57°
43°
2
58°
43°
3
56°
44°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Newcastle
Newcastle's September 2026 forecast shows daily high temperatures ranging from 56° to 67°, with overnight lows between 43° and 54°. The average high for September is 62° with an average low of 49°. 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 Newcastle. See also: October | November | December.
