S
M
T
W
T
F
S
30
73°
54°
31
79°
56°
1
80°
49°
2
75°
48°
3
72°
49°
4
75°
54°
5
77°
57°
6
79°
51°
7
76°
49°
8
73°
53°
9
71°
55°
10
71°
55°
11
72°
53°
12
75°
53°
13
73°
52°
14
68°
46°
15
68°
45°
16
69°
44°
17
68°
47°
18
68°
50°
19
71°
51°
20
72°
52°
21
73°
48°
22
66°
42°
23
66°
47°
24
65°
50°
25
69°
44°
26
63°
46°
27
67°
48°
28
Hist. Avg.
66°
42°
29
Hist. Avg.
66°
42°
30
Hist. Avg.
65°
42°
1
Hist. Avg.
65°
41°
2
Hist. Avg.
64°
41°
3
Hist. Avg.
64°
40°
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 63° to 80°, with overnight lows between 42° and 57°. The average high for September is 72° with an average low of 50°. 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.
