S
M
T
W
T
F
S
30
84°
58°
31
80°
69°
1
89°
70°
2
76°
68°
3
86°
68°
4
85°
68°
5
80°
63°
6
77°
58°
7
77°
56°
8
82°
60°
9
86°
69°
10
78°
64°
11
80°
55°
12
78°
65°
13
80°
60°
14
82°
60°
15
80°
61°
16
77°
56°
17
77°
56°
18
72°
52°
19
74°
50°
20
74°
52°
21
73°
51°
22
72°
55°
23
71°
55°
24
71°
54°
25
72°
54°
26
77°
53°
27
75°
51°
28
74°
53°
29
76°
54°
30
77°
54°
1
76°
53°
2
74°
52°
3
74°
50°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Penryn
Penryn's September 2026 forecast shows daily high temperatures ranging from 71° to 86°, with overnight lows between 50° and 69°. The average high for September is 76° with an average low of 56°. 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 Penryn. See also: October | November | December.
