S
M
T
W
T
F
S
29
99°
72°
30
99°
73°
1
98°
72°
2
98°
71°
3
97°
72°
4
98°
70°
5
97°
67°
6
96°
69°
7
98°
68°
8
98°
67°
9
98°
67°
10
99°
68°
11
97°
69°
12
Hist. Avg.
87°
69°
13
Hist. Avg.
87°
69°
14
Hist. Avg.
87°
69°
15
Hist. Avg.
87°
69°
16
Hist. Avg.
87°
69°
17
Hist. Avg.
87°
69°
18
Hist. Avg.
87°
69°
19
Hist. Avg.
87°
69°
20
Hist. Avg.
87°
69°
21
Hist. Avg.
87°
69°
22
Hist. Avg.
87°
69°
23
Hist. Avg.
87°
69°
24
Hist. Avg.
87°
68°
25
Hist. Avg.
87°
68°
26
Hist. Avg.
87°
68°
27
Hist. Avg.
87°
68°
28
Hist. Avg.
87°
68°
29
Hist. Avg.
87°
68°
30
Hist. Avg.
87°
68°
31
Hist. Avg.
87°
68°
1
Hist. Avg.
87°
68°
2
Hist. Avg.
87°
68°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
December Weather in San Isidro
San Isidro's December 2026 forecast shows daily high temperatures ranging from 96° to 99°, with overnight lows between 67° and 73°. The average high for December is 98° with an average low of 70°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how December weather will actually feel in San Isidro. See also: January | February | March.
