S
M
T
W
T
F
S
30
87°
73°
31
87°
73°
1
86°
72°
2
87°
72°
3
87°
73°
4
88°
72°
5
88°
74°
6
89°
74°
7
86°
72°
8
86°
74°
9
89°
72°
10
88°
71°
11
89°
73°
12
88°
72°
13
87°
71°
14
88°
72°
15
87°
72°
16
88°
74°
17
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18
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19
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20
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21
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24
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25
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26
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27
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28
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29
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30
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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 86° to 89°, with overnight lows between 71° and 74°. The average high for September is 88° with an average low of 73°. 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.
