S
M
T
W
T
F
S
30
77°
46°
31
69°
44°
1
69°
45°
2
68°
53°
3
71°
48°
4
72°
43°
5
67°
46°
6
68°
53°
7
74°
52°
8
77°
51°
9
76°
50°
10
74°
49°
11
68°
50°
12
67°
49°
13
75°
47°
14
73°
49°
15
Hist. Avg.
64°
48°
16
Hist. Avg.
63°
47°
17
Hist. Avg.
63°
47°
18
Hist. Avg.
62°
47°
19
Hist. Avg.
62°
46°
20
Hist. Avg.
62°
46°
21
Hist. Avg.
61°
46°
22
Hist. Avg.
61°
45°
23
Hist. Avg.
60°
45°
24
Hist. Avg.
60°
44°
25
Hist. Avg.
60°
44°
26
Hist. Avg.
59°
44°
27
Hist. Avg.
59°
43°
28
Hist. Avg.
58°
43°
29
Hist. Avg.
58°
43°
30
Hist. Avg.
57°
42°
1
Hist. Avg.
57°
42°
2
Hist. Avg.
57°
41°
3
Hist. Avg.
56°
41°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Harriston
Harriston's September 2026 forecast shows daily high temperatures ranging from 67° to 77°, with overnight lows between 43° and 53°. The average high for September is 72° with an average low of 48°. 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 Harriston. See also: October | November | December.
