S
M
T
W
T
F
S
30
89°
65°
31
87°
72°
1
97°
70°
2
86°
71°
3
90°
71°
4
90°
72°
5
81°
67°
6
80°
64°
7
80°
62°
8
84°
59°
9
87°
68°
10
90°
74°
11
80°
69°
12
80°
72°
13
87°
68°
14
81°
55°
15
81°
60°
16
82°
60°
17
83°
65°
18
82°
60°
19
76°
57°
20
75°
54°
21
72°
54°
22
73°
55°
23
75°
56°
24
76°
55°
25
70°
55°
26
69°
55°
27
75°
58°
28
77°
58°
29
73°
56°
30
75°
58°
1
74°
57°
2
73°
56°
3
74°
56°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Newmarket
Newmarket's September 2026 forecast shows daily high temperatures ranging from 69° to 87°, with overnight lows between 54° and 72°. The average high for September is 77° with an average low of 59°. 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 Newmarket. See also: October | November | December.
