Annual mean 27°C · wettest around November · prevailing wind E
Warmest
32.9 °C
Coldest
28.5 °C
Wettest
77%
Windiest
5.9 m/s
Prevailing
E
4.9 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
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 33°C; January is the coldest, with lows of about 21°C. San Juan has no sharply defined rainy season: the chance of rain on a given day runs from 55% in August, the driest month, to 63% in November, the wettest. Winds in San Juan are highest in August, averaging 3.5 m/s (13 km/h), and lightest in October, at 2.7 m/s (10 km/h). The prevailing wind is from the E. The clearest skies in San Juan come in January, when the sky is typically 44% covered; May is the cloudiest month, at 57%.
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
29°C
21°C
30°C
62%
44%
2.8 m/s
17
76
2
February
29°C
21°C
29°C
57%
45%
3.1 m/s
24
76
2
March
30°C
22°C
31°C
56%
46%
3.2 m/s
18
68
2
April
30°C
24°C
31°C
55%
51%
3.2 m/s
9
68
0
May
31°C
25°C
33°C
59%
57%
3.3 m/s
3
50
0
June
32°C
26°C
34°C
55%
53%
3.4 m/s
1
40
0
July
32°C
26°C
34°C
58%
51%
3.4 m/s
1
35
0
August
32°C
26°C
35°C
55%
54%
3.5 m/s
1
31
0
September
33°C
25°C
35°C
58%
54%
2.9 m/s
1
27
0
October
31°C
25°C
34°C
60%
54%
2.7 m/s
1
34
0
November
30°C
23°C
33°C
63%
52%
2.7 m/s
5
52
0
December
29°C
22°C
31°C
55%
47%
2.7 m/s
11
69
0
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 29°C at their warmest in January, its coolest month, and 33°C in September, its warmest; the coolest hours of the day run from 21°C to 26°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 August. 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 29°CLow 21°CRain 58%
Winter in San Juan has typical daily highs of about 29°C and lows of about 21°C, with a 58% chance of rain on a given day.
San Juan weather in springMarch to May
High 30°CLow 23°CRain 57%
Spring in San Juan has typical daily highs of about 30°C and lows of about 23°C, with a 57% chance of rain on a given day.
San Juan weather in summerJune to August
High 32°CLow 26°CRain 56%
Summer in San Juan has typical daily highs of about 32°C and lows of about 26°C, with a 56% chance of rain on a given day.
San Juan weather in autumnSeptember to November
High 31°CLow 24°CRain 60%
Autumn in San Juan has typical daily highs of about 31°C and lows of about 24°C, with a 60% 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 55% in August, the driest month, to 63% in November, the wettest.
What time of year is San Juan windiest?
Winds in San Juan are highest in August, averaging 3.5 m/s (13 km/h), and lightest in October, at 2.7 m/s (10 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 33°C; January is the coldest, with lows of about 21°C.