The weather in August in San Juan

It's hot in August in San Juan with an average temperature of 32°C. Temperatures this month range from a low of 31°C to a high of 33°C. At night, you can expect temperatures between 26°C and 27°C.

Looking for sun? August isn’t a good month to be in San Juan. The temperature is nice, but there’s too much chance of rain.

Average temperatures and precipitation

This chart shows the average daily maximum and minimum temperatures (in degrees Celsius) and precipitation (in millimeters) in August for San Juan, Puerto Rico. A low precipitation value usually indicates little to no rainfall on that day in recent years, while a higher value suggests more frequent rainfall.

Temperature records

With 35°C in 2023, San Juan reached the highest temperature in August over the past 10 years. The lowest daytime temperature in this month was 27°C in 2014. The extreme nighttime temperatures ranged from a lowest recorded value of 23°C to a highest value of 29°C.

Water temperature

The water temperature at San Juan is 31°C this month. It’s really warm, perfect for a swim.

Rainfall amount

In August, there is an average of 149 mm of precipitation, spread over 17 days. The wind speed is around 4 Bft, mostly coming from the East.

Daily weather in August for San Juan

Click on any day in August to get detailed info about the usual weather on that day in San Juan. Check out the historical temperatures and precipitation over the past 10 years on this day.

1

32° / 26°

2

31° / 26°

3

32° / 27°

4

32° / 27°

5

32° / 27°

6

32° / 27°

7

32° / 27°

8

32° / 27°

9

32° / 27°

10

32° / 26°

11

32° / 27°

12

32° / 27°

13

32° / 26°

14

32° / 27°

15

32° / 27°

16

32° / 27°

17

32° / 26°

18

32° / 26°

19

32° / 27°

20

32° / 26°

21

32° / 27°

22

31° / 26°

23

32° / 26°

24

32° / 26°

25

32° / 26°

26

33° / 26°

27

32° / 27°

28

32° / 27°

29

32° / 27°

30

32° / 27°

31

32° / 27°

Start of August

The month of August starts in San Juan with hot temps, averaging around 32°C during the day and nights around 27°C.

Mid August

By mid-August, daytime temps stay steady at around 32°C, with nights around 27°C. During this part of the month, you might see regular precipitation, but there will also be some sunny days.

End of August

By the end of August, the average daytime temperature in San Juan is around 32°C, while nighttime temps are about 27°C. Expect regular precipitation, but if you’re lucky, you’ll also get some dry and sunny days.

Find affordable trips to San Juan

UV index

The UV index is a maximum of 9 this month. That's a very high value on the intensity scale of 1 to 11. Unprotected skin can burn within 10-15 minutes.

The hurricane season in San Juan runs from June to November.

Check out the climate of San Juan for all months and discover the best travel time

Temperature charts

These charts show the average temperatures in August in San Juan, Puerto Rico. The temperatures are shown in degrees Celsius and are calculated based on data from the past 10 years.

Daily Temperature in August in San Juan

Temperature in August in San Juan over the years

Precipitation charts

These charts show the average amount of precipitation in August in San Juan, Puerto Rico. Precipitation is always measured as water, even when it falls as snow or hail The amount of precipitation is displayed in millimeters, while snowfall is shown in centimeters.

Daily Precipitation in August in San Juan

Total precipitation in August in San Juan over the years

Daily UV index in August in San Juan

This chart shows the average daily UV index in August in San Juan, with the UV index ranging from 0 to a maximum of 11. The bottom of the chart shows the days of the month. Based on historical data, this chart provides an idea of the daily UV radiation levels you can expect.

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Average weather in San Juan by month

Click on a month below to see detailed weather info for San Juan. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.