Normal weather for San Juan in August
It's warm in August in San Juan with an average temperature of 25°C. Temperatures this month range from a low of 22°C to a high of 29°C. At night, you can expect temperatures between 11°C and 17°C.
In August, there is an average of 101 mm of precipitation, spread over 13 days. The wind speed is around 4 Bft, mostly coming from the East.
San Juan in August |
London | ||
|---|---|---|---|
 Average Temperature |
25°C | 22°C | |
 High Temp |
29°C | 24°C | |
| Low Temp |
22°C | 19°C | |
 Total Precipitation |
101 mm | 60 mm | |
| Rainy Days |
13 days | 10 days | |
Start of August
The month of August starts in San Juan with warm temperatures, averaging around 25°C during the day and nights close to 15°C. A few showers might pop up in the first days of the month, but the weather remains mostly sunny and dry.
Since temperatures can differ between day and night, it’s a good idea to dress in layers. A T-shirt, light trousers or skirt, and a light jacket are perfect for daytime. For the evening and morning, a shirt, maybe a light cardigan, and light trousers will do.
Mid-August
By mid-August, the average daytime temperature stays the same at 25°C, with nights close to 14°C. During this part of the month, you can expect regular precipitation, but there’ll also be some sunny days.
Temperatures vary between day and night, so it’s smart to wear layers. A T-shirt, light trousers or skirt, and a light jacket are perfect for daytime. In the evening and morning, we recommend a light coat, jumper or cardigan, and long trousers.
End of August
By the end of August, the average daytime temperature in San Juan will be around 27°C, with nights close to 16°C. There’s regular precipitation, but with a bit of luck, you’ll also get some dry and sunny days.
As it gets cooler in the evening, it’s best to wear layers. Breezy clothes like shorts or a dress, plus a hat and sunglasses, are ideal for the day. For the evening and morning, a shirt, maybe a light cardigan, and light trousers will do.
UV index
The UV index is a maximum of 8 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.
Temperature records for San Juan in August
With 37°C, San Juan hit the highest temperature in the last 10 years in August 2021. The lowest daytime temperature in this month was 9°C in 2018. The extreme night temperatures ranged from a low of 0°C to a high of 24°C.
Check out the climate of San Juan for all months and discover the best travel time
July
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 13 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
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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.
