S
M
T
W
T
F
S
30
83°
65°
31
86°
65°
1
85°
64°
2
88°
64°
3
88°
63°
4
87°
60°
5
81°
64°
6
86°
64°
7
86°
63°
8
82°
61°
9
79°
62°
10
81°
63°
11
86°
62°
12
86°
62°
13
85°
63°
14
86°
62°
15
85°
61°
16
84°
60°
17
84°
53°
18
77°
54°
19
78°
51°
20
77°
51°
21
75°
50°
22
75°
53°
23
76°
55°
24
82°
56°
25
81°
57°
26
81°
57°
27
82°
56°
28
81°
55°
29
80°
54°
30
79°
53°
1
76°
51°
2
78°
53°
3
80°
55°
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 75° to 88°, with overnight lows between 50° and 65°. The average high for September is 82° with an average low of 58°. 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.
