S
M
T
W
T
F
S
30
91°
58°
31
87°
57°
1
80°
55°
2
84°
55°
3
86°
59°
4
82°
63°
5
88°
62°
6
88°
55°
7
91°
57°
8
97°
58°
9
101°
67°
10
105°
69°
11
98°
63°
12
95°
60°
13
82°
60°
14
86°
53°
15
91°
50°
16
86°
56°
17
79°
53°
18
86°
56°
19
91°
60°
20
85°
56°
21
87°
55°
22
91°
58°
23
96°
59°
24
99°
61°
25
94°
63°
26
93°
61°
27
91°
59°
28
87°
56°
29
86°
56°
30
85°
57°
1
96°
54°
2
82°
56°
3
88°
55°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Merced
Merced's September 2026 forecast shows daily high temperatures ranging from 82° to 99°, with overnight lows between 54° and 63°. The average high for September is 90° with an average low of 58°. 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 Merced. See also: October | November | December.
