S
M
T
W
T
F
S
30
84°
64°
31
84°
63°
1
85°
64°
2
86°
65°
3
84°
67°
4
88°
62°
5
84°
67°
6
86°
65°
7
82°
66°
8
86°
65°
9
83°
66°
10
82°
65°
11
85°
66°
12
87°
65°
13
84°
65°
14
86°
66°
15
86°
65°
16
85°
65°
17
85°
62°
18
84°
58°
19
80°
58°
20
79°
55°
21
78°
57°
22
77°
58°
23
79°
59°
24
82°
56°
25
82°
59°
26
80°
60°
27
81°
59°
28
80°
58°
29
79°
59°
30
80°
58°
1
78°
55°
2
80°
57°
3
75°
57°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Alnwick
Alnwick's September 2026 forecast shows daily high temperatures ranging from 75° to 88°, with overnight lows between 55° and 67°. The average high for September is 82° 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 Alnwick. See also: October | November | December.
