S
M
T
W
T
F
S
30
81°
65°
31
80°
66°
1
85°
60°
2
80°
60°
3
80°
61°
4
79°
59°
5
79°
59°
6
80°
61°
7
82°
60°
8
81°
64°
9
84°
64°
10
79°
63°
11
81°
63°
12
83°
62°
13
83°
63°
14
82°
63°
15
83°
62°
16
82°
60°
17
81°
61°
18
75°
62°
19
80°
61°
20
81°
61°
21
80°
59°
22
80°
53°
23
77°
59°
24
75°
59°
25
Hist. Avg.
76°
58°
26
Hist. Avg.
75°
57°
27
Hist. Avg.
75°
57°
28
Hist. Avg.
74°
56°
29
Hist. Avg.
74°
56°
30
Hist. Avg.
74°
56°
1
Hist. Avg.
73°
55°
2
Hist. Avg.
73°
55°
3
Hist. Avg.
72°
54°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Blenheim
Blenheim's September 2026 forecast shows daily high temperatures ranging from 75° to 85°, with overnight lows between 53° and 66°. The average high for September is 81° with an average low of 61°. 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 Blenheim. See also: October | November | December.
