S
M
T
W
T
F
S
30
91°
70°
31
92°
70°
1
91°
69°
2
92°
68°
3
91°
67°
4
91°
62°
5
84°
61°
6
84°
65°
7
88°
68°
8
90°
69°
9
91°
69°
10
89°
68°
11
88°
68°
12
89°
67°
13
88°
65°
14
87°
66°
15
88°
66°
16
80°
64°
17
81°
66°
18
Hist. Avg.
83°
61°
19
Hist. Avg.
83°
61°
20
Hist. Avg.
83°
61°
21
Hist. Avg.
82°
60°
22
Hist. Avg.
82°
60°
23
Hist. Avg.
82°
59°
24
Hist. Avg.
81°
59°
25
Hist. Avg.
81°
59°
26
Hist. Avg.
81°
58°
27
Hist. Avg.
80°
58°
28
Hist. Avg.
80°
57°
29
Hist. Avg.
80°
57°
30
Hist. Avg.
79°
57°
1
Hist. Avg.
79°
56°
2
Hist. Avg.
79°
56°
3
Hist. Avg.
78°
55°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Newcastle
Newcastle's September 2026 forecast shows daily high temperatures ranging from 80° to 92°, with overnight lows between 61° and 70°. The average high for September is 88° with an average low of 67°. 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.
