Annual mean 22°C · wettest around September · prevailing wind S
Warmest
29.3 °C
Coldest
25.5 °C
Wettest
100%
Windiest
4.5 m/s
Prevailing
S
3.5 m/s average
When this place is good five ratings · thirty-six ten-day sections · click a cell to read it
never good
never good
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Every reading
bars actual · line feels-like, °Cchance of rain, %wind speed, m/ssky covered, %
The average temperature in San Marcos over the whole year is 22°C. April is the hottest month, with highs of about 29°C; January is the coldest, with lows of about 14°C. The rainy (wet) season in San Marcos runs from May to October, peaking in September with a 84% chance of rain on a given day. The dry season is November to April; December is the driest month, at 21%. Winds in San Marcos are highest in February, averaging 2.5 m/s (9 km/h), and lightest in June, at 1.7 m/s (6 km/h). The prevailing wind is from the S. The clearest skies in San Marcos come in February, when the sky is typically 40% covered; June is the cloudiest month, at 77%.
Month by month San Marcos climate by month: average temperatures year round · click a month to read it
Month
High
Low
Feels like
Chance of rain
Cloud
Wind
Being outside
Sun
Walking
January
26°C
14°C
26°C
37%
45%
2.1 m/s
38
19
41
February
27°C
14°C
26°C
36%
40%
2.5 m/s
35
18
39
March
29°C
16°C
28°C
35%
46%
2.2 m/s
39
17
33
April
29°C
18°C
29°C
46%
54%
2.0 m/s
40
14
30
May
28°C
18°C
29°C
63%
70%
1.8 m/s
40
15
29
June
26°C
18°C
28°C
79%
77%
1.7 m/s
42
15
33
July
26°C
17°C
27°C
78%
69%
2.1 m/s
43
6
43
August
27°C
17°C
28°C
76%
72%
1.9 m/s
44
9
37
September
26°C
18°C
27°C
84%
74%
1.7 m/s
45
11
40
October
26°C
17°C
27°C
78%
71%
1.9 m/s
42
9
40
November
26°C
16°C
27°C
51%
56%
2.0 m/s
40
10
41
December
26°C
15°C
26°C
21%
46%
2.0 m/s
36
16
40
High and low are the warmest and coolest of four readings a day — midnight, 6am, noon and 6pm — so a true overnight low can sit a degree or two under them. Chance of rain, cloud and wind are the day’s average; feels-like and the three ratings (each out of 100: Good from 55, Ideal from 80) are read at midday.
Seasons, and the year in short San Marcos weather by season
Year round, San Marcos has days of about 26°C at their warmest in November, its coolest month, and 29°C in April, its warmest; the coolest hours of the day run from 14°C to 18°C through the year, and the average temperature over the year is 22°C around the clock. Rain is most likely around September and least likely around December. Every figure here is a decade of observations blended into one representative year, so it reads as what this date is usually like, not a forecast for one particular day.
San Marcos weather in winterDecember to February
High 26°CLow 14°CRain 31%
Winter in San Marcos has typical daily highs of about 26°C and lows of about 14°C, with a 31% chance of rain on a given day.
San Marcos weather in springMarch to May
High 29°CLow 17°CRain 48%
Spring in San Marcos has typical daily highs of about 29°C and lows of about 17°C, with a 48% chance of rain on a given day.
San Marcos weather in summerJune to August
High 27°CLow 17°CRain 77%
Summer in San Marcos has typical daily highs of about 27°C and lows of about 17°C, with a 77% chance of rain on a given day.
San Marcos weather in autumnSeptember to November
High 26°CLow 17°CRain 71%
Autumn in San Marcos has typical daily highs of about 26°C and lows of about 17°C, with a 71% chance of rain on a given day.
When is the rainy season in San Marcos?
The rainy (wet) season in San Marcos runs from May to October, peaking in September with a 84% chance of rain on a given day. The dry season is November to April; December is the driest month, at 21%.
What time of year is San Marcos windiest?
Winds in San Marcos are highest in February, averaging 2.5 m/s (9 km/h), and lightest in June, at 1.7 m/s (6 km/h). The prevailing wind is from the S.
What is the average temperature in San Marcos year round?
The average temperature in San Marcos over the whole year is 22°C. April is the hottest month, with highs of about 29°C; January is the coldest, with lows of about 14°C.