S
M
T
W
T
F
S
27
91°
72°
28
85°
65°
29
88°
61°
30
90°
63°
1
95°
65°
2
103°
66°
3
103°
74°
4
102°
73°
5
104°
76°
6
103°
74°
7
101°
72°
8
100°
69°
9
96°
65°
10
89°
66°
11
82°
60°
12
75°
60°
13
78°
60°
14
79°
59°
15
84°
60°
16
86°
60°
17
87°
62°
18
88°
62°
19
88°
63°
20
81°
56°
21
84°
59°
22
83°
59°
23
84°
59°
24
84°
60°
25
83°
59°
26
84°
59°
27
83°
58°
28
83°
58°
29
82°
57°
30
82°
57°
31
80°
56°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
October Weather in Rancho Cucamonga
Rancho Cucamonga's October 2026 forecast shows daily high temperatures ranging from 75° to 101°, with overnight lows between 56° and 72°. The average high for October is 85° with an average low of 61°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how October weather will actually feel in Rancho Cucamonga. See also: November | December | January.
