Annual mean 27°C · wettest around November · prevailing wind E
Warmest
31.1 °C
Coldest
27.4 °C
Wettest
26%
Windiest
6.3 m/s
Prevailing
E
5.2 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 Juan over the whole year is 27°C. September is the hottest month, with highs of about 31°C; January is the coldest, with lows of about 23°C. San Juan has no sharply defined rainy season: the chance of rain on a given day runs from 19% in March, the driest month, to 26% in November, the wettest. Winds in San Juan are highest in July, averaging 4.1 m/s (15 km/h), and lightest in October, at 2.4 m/s (9 km/h). The prevailing wind is from the E. The clearest skies in San Juan come in September, when the sky is typically 51% covered; November is the cloudiest month, at 55%.
Month by month San Juan 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
28°C
23°C
29°C
20%
52%
3.2 m/s
36
79
3
February
28°C
24°C
28°C
23%
53%
3.6 m/s
44
75
5
March
28°C
23°C
28°C
19%
52%
3.7 m/s
40
77
4
April
28°C
24°C
29°C
24%
55%
3.5 m/s
29
76
2
May
29°C
25°C
31°C
24%
53%
3.5 m/s
10
66
0
June
30°C
26°C
32°C
23%
52%
3.9 m/s
4
59
0
July
30°C
27°C
32°C
25%
53%
4.1 m/s
2
58
0
August
31°C
27°C
33°C
26%
52%
3.7 m/s
1
50
0
September
31°C
27°C
34°C
20%
51%
2.9 m/s
1
42
0
October
31°C
26°C
34°C
24%
53%
2.4 m/s
1
47
0
November
30°C
25°C
32°C
26%
55%
2.5 m/s
4
63
0
December
29°C
24°C
30°C
25%
53%
3.1 m/s
20
73
1
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 Juan weather by season
Year round, San Juan has days of about 28°C at their warmest in February, its coolest month, and 31°C in September, its warmest; the coolest hours of the day run from 23°C to 27°C through the year, and the average temperature over the year is 27°C around the clock. Rain is most likely around November and least likely around March. 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 Juan weather in winterDecember to February
High 28°CLow 24°CRain 23%
Winter in San Juan has typical daily highs of about 28°C and lows of about 24°C, with a 23% chance of rain on a given day.
San Juan weather in springMarch to May
High 28°CLow 24°CRain 22%
Spring in San Juan has typical daily highs of about 28°C and lows of about 24°C, with a 22% chance of rain on a given day.
San Juan weather in summerJune to August
High 30°CLow 27°CRain 24%
Summer in San Juan has typical daily highs of about 30°C and lows of about 27°C, with a 24% chance of rain on a given day.
San Juan weather in autumnSeptember to November
High 30°CLow 26°CRain 23%
Autumn in San Juan has typical daily highs of about 30°C and lows of about 26°C, with a 23% chance of rain on a given day.
When is the rainy season in San Juan?
San Juan has no sharply defined rainy season: the chance of rain on a given day runs from 19% in March, the driest month, to 26% in November, the wettest.
What time of year is San Juan windiest?
Winds in San Juan are highest in July, averaging 4.1 m/s (15 km/h), and lightest in October, at 2.4 m/s (9 km/h). The prevailing wind is from the E.
What is the average temperature in San Juan year round?
The average temperature in San Juan over the whole year is 27°C. September is the hottest month, with highs of about 31°C; January is the coldest, with lows of about 23°C.