S
M
T
W
T
F
S
30
86°
57°
31
82°
46°
1
79°
61°
2
90°
54°
3
90°
61°
4
95°
59°
5
91°
61°
6
93°
59°
7
88°
54°
8
79°
50°
9
77°
46°
10
88°
46°
11
82°
54°
12
72°
50°
13
77°
46°
14
70°
52°
15
72°
41°
16
78°
54°
17
71°
56°
18
77°
53°
19
67°
51°
20
62°
48°
21
66°
52°
22
72°
52°
23
73°
53°
24
76°
57°
25
80°
56°
26
78°
52°
27
75°
52°
28
69°
49°
29
68°
42°
30
66°
49°
1
72°
44°
2
59°
50°
3
66°
49°
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 59° to 80°, with overnight lows between 42° and 57°. The average high for September is 71° with an average low of 51°. 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.
