S
M
T
W
T
F
S
30
72°
66°
31
71°
66°
1
81°
68°
2
82°
67°
3
85°
66°
4
78°
62°
5
77°
61°
6
72°
59°
7
78°
57°
8
78°
65°
9
76°
57°
10
73°
49°
11
72°
53°
12
77°
60°
13
75°
53°
14
69°
58°
15
74°
51°
16
68°
50°
17
68°
51°
18
63°
45°
19
63°
46°
20
64°
46°
21
63°
46°
22
62°
51°
23
64°
51°
24
67°
50°
25
71°
51°
26
70°
49°
27
64°
49°
28
69°
50°
29
70°
52°
30
71°
52°
1
70°
51°
2
68°
48°
3
67°
44°
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 62° to 78°, with overnight lows between 44° and 65°. The average high for September is 69° with an average low of 51°. 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.
