S
M
T
W
T
F
S
30
93°
74°
31
90°
71°
1
90°
69°
2
89°
69°
3
90°
72°
4
92°
71°
5
93°
70°
6
91°
72°
7
89°
72°
8
93°
73°
9
93°
68°
10
90°
67°
11
89°
71°
12
91°
66°
13
87°
65°
14
85°
64°
15
86°
63°
16
85°
65°
17
89°
64°
18
91°
65°
19
91°
63°
20
90°
68°
21
90°
69°
22
Hist. Avg.
86°
65°
23
Hist. Avg.
86°
64°
24
Hist. Avg.
86°
64°
25
Hist. Avg.
86°
64°
26
Hist. Avg.
85°
63°
27
Hist. Avg.
85°
63°
28
Hist. Avg.
84°
63°
29
Hist. Avg.
84°
62°
30
Hist. Avg.
84°
62°
1
Hist. Avg.
84°
62°
2
Hist. Avg.
83°
61°
3
Hist. Avg.
83°
61°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Fossil Park
Fossil Park's September 2026 forecast shows daily high temperatures ranging from 85° to 93°, with overnight lows between 63° and 74°. The average high for September is 90° with an average low of 68°. 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 Fossil Park. See also: October | November | December.
