Temperatures in August
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.
Max and Min Temperatures per Day
This chart shows the daily maximum and minimum temperatures in degrees Celsius for San Juan in August. The red line indicates the max temperatures, and the blue line shows the minimums.
Start of August
The month of August starts in San Juan with hot temperatures, averaging around 32°C during the day and nights close to 27°C. A few showers might pop up in the first days of the month, but the weather remains mostly sunny and dry. Breezy clothes like shorts or a dress, plus a hat and sunglasses, are ideal.
Mid-August
By mid-August, the average daytime temperature stays the same at 32°C, with nights close to 27°C. During this part of the month, you can expect regular precipitation, but there’ll also be some sunny days. Breezy clothes like shorts or a dress, plus a hat and sunglasses, are ideal.
End of August
By the end of August, the average daytime temperature in San Juan will be around 32°C, with nights close to 27°C. There’s regular precipitation, but with a bit of luck, you’ll also get some dry and sunny days. Breezy clothes like shorts or a dress, plus a hat and sunglasses, are ideal.
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Water temperature
The water temperature at San Juan is 31°C this month. It’s really warm, perfect for a swim.
Precipitation in August
In August, there is an average of 149 mm of precipitation, spread over 14 days. The wind speed is around 4 Bft, mostly coming from the East.
The average precipitation chance is 46% per day this month.
Precipitation Chance
This chart shows the daily precipitation chance (in percentages) in August for San Juan. 0% means it never rained on that day in the past 10 years, and 100% means it rained every day. All values in between represent the average chance of precipitation on that day.
San Juan in August |
London | ||
|---|---|---|---|
 Average Temperature |
32°C | 22°C | |
 High Temp |
33°C | 24°C | |
| Low Temp |
31°C | 19°C | |
 Total Precipitation |
149 mm | 60 mm | |
| Rainy Days |
14 days | 10 days | |
July
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.
Is August a good time to visit San Juan?
After some sun? Then August isn’t the best time to be in San Juan. The temperature is pleasant, but there’s too much chance of rain this month.
The hurricane season in San Juan runs from June to November.
Temperature records for San Juan in August
With 35°C, San Juan hit the highest temperature in the last 10 years in August 2023. The lowest daytime temperature in this month was 27°C in 2014. The extreme night temperatures ranged from a low of 23°C to a high of 29°C.
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Daily Temperature in August in San Juan
This chart shows the average daily temperatures, both day and night, for each day in August in San Juan, measured in degrees Celsius. The red line represents the maximum temperatures, while the blue line shows the minimums. The days of the month are displayed at the bottom of the chart. The data, based on historical observations, gives an overview of the average daily temperatures during this month.
Daily Precipitation in August in San Juan
The chart below shows the average daily precipitation in August for San Juan, measured in millimetres over the past years. Precipitation is always measured as water, even if it’s snow or hail. The days of the month are shown at the bottom of the chart.
A low average precipitation means that the chance of rain on that day is usually small, while a higher average suggests that rain is more likely. But it’s still an average, so each day can be different. Based on historical weather data for August, you can expect around 14 days of rain in San Juan.
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.
Temperature in August in San Juan Over the Years
This chart shows the average temperature in August in San Juan, measured in degrees Celsius, over the past years.
Total Precipitation in August in San Juan Over the Years
This chart shows the average precipitation in August in San Juan, measured in millimetres over the past years. Precipitation is always measured as water, even if it’s snow or hail.
Daily climate in August for San Juan
Click on a specific day in August for detailed info on the typical weather on that day in San Juan. Check out the historical temperatures and precipitation over the past 10 years on this day.
Weather experiences in August in San Juan
Have you been to San Juan in August?
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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.
