S
M
T
W
T
F
S
30
71°
55°
31
76°
54°
1
66°
57°
2
70°
55°
3
68°
53°
4
70°
53°
5
70°
52°
6
74°
53°
7
70°
57°
8
74°
55°
9
78°
54°
10
71°
56°
11
71°
56°
12
72°
55°
13
69°
55°
14
70°
51°
15
75°
52°
16
79°
55°
17
80°
54°
18
81°
55°
19
75°
53°
20
71°
52°
21
70°
53°
22
70°
52°
23
72°
53°
24
68°
51°
25
63°
54°
26
64°
52°
27
62°
48°
28
61°
48°
29
61°
45°
30
62°
45°
1
61°
53°
2
64°
53°
3
60°
46°
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 60° to 81°, with overnight lows between 45° and 56°. The average high for September is 69° 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 Newcastle. See also: October | November | December.
