S
M
T
W
T
F
S
30
102°
77°
31
99°
74°
1
100°
76°
2
98°
74°
3
97°
76°
4
97°
75°
5
98°
74°
6
100°
76°
7
101°
77°
8
100°
76°
9
97°
72°
10
95°
71°
11
91°
66°
12
88°
66°
13
90°
70°
14
88°
69°
15
89°
68°
16
89°
69°
17
88°
69°
18
89°
68°
19
89°
69°
20
88°
68°
21
88°
68°
22
87°
67°
23
87°
67°
24
86°
66°
25
85°
66°
26
86°
64°
27
87°
65°
28
86°
65°
29
86°
64°
30
86°
65°
1
85°
65°
2
85°
64°
3
84°
64°
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 84° to 101°, with overnight lows between 64° and 77°. The average high for September is 91° with an average low of 69°. 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.
