S
M
T
W
T
F
S
30
86°
64°
31
85°
67°
1
87°
68°
2
86°
64°
3
84°
63°
4
83°
62°
5
83°
62°
6
84°
63°
7
84°
62°
8
85°
63°
9
87°
66°
10
87°
62°
11
86°
62°
12
87°
65°
13
87°
65°
14
86°
66°
15
87°
66°
16
87°
65°
17
85°
64°
18
85°
63°
19
84°
62°
20
83°
62°
21
84°
63°
22
83°
58°
23
81°
59°
24
79°
61°
25
Hist. Avg.
80°
59°
26
Hist. Avg.
80°
58°
27
Hist. Avg.
80°
58°
28
Hist. Avg.
80°
57°
29
Hist. Avg.
79°
57°
30
Hist. Avg.
79°
57°
1
Hist. Avg.
79°
56°
2
Hist. Avg.
78°
56°
3
Hist. Avg.
78°
55°
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 79° to 87°, with overnight lows between 58° and 68°. The average high for September is 85° with an average low of 63°. 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.
