S
M
T
W
T
F
S
30
89°
61°
31
88°
59°
1
88°
60°
2
89°
60°
3
92°
61°
4
92°
64°
5
91°
64°
6
93°
63°
7
93°
64°
8
92°
64°
9
92°
63°
10
85°
63°
11
84°
64°
12
90°
64°
13
91°
65°
14
91°
63°
15
90°
62°
16
89°
61°
17
87°
62°
18
89°
62°
19
89°
62°
20
Hist. Avg.
86°
59°
21
Hist. Avg.
86°
59°
22
Hist. Avg.
85°
58°
23
Hist. Avg.
85°
58°
24
Hist. Avg.
85°
58°
25
Hist. Avg.
84°
58°
26
Hist. Avg.
84°
58°
27
Hist. Avg.
84°
57°
28
Hist. Avg.
84°
57°
29
Hist. Avg.
83°
57°
30
Hist. Avg.
83°
56°
1
Hist. Avg.
83°
56°
2
Hist. Avg.
82°
56°
3
Hist. Avg.
82°
56°
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 84° to 93°, with overnight lows between 59° and 65°. The average high for September is 90° with an average low of 62°. 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.
