If you plan to visit San Juan in August, the weather is typically alright, with an average high temperature of +88°F during the day and approximately 1 sunny days. Expect some rainy, though, as there are typically 22 rainy days in the month and around 106 mm of precipitation. The weather is changeable so you may have to pack for every eventuality. Search flightsin one click on Avionero.
Average weather
☀️
+88°F
Avg. max. temperature
+73°F
Min.
+95°F
Max.
106 mm
Total precipitation
78%
Avg. humidity
3 m/s
Avg. wind
1 ☀️
Sunny Days
3 ⛅️
Cloudy
22 🌦
Rainy
Our opinion: San Juan has OK weather in August.
Avionero – A better way to search for flights:
Cheapest prices on the market!
Check all your dates and date combinations in a single search!
Want inspiration, set your dates and find the cheapest destinations!
Saves your searches in the browser so you can easily return to them!
Average temperature in San Juan in August
Here are the expected maximum, average and minimum temperatures in San Juan for August based on the historical data.
Last Year
Historical Data
Going from a maximum of +95°F during the day to a minimum of +77°F during the night, the temperature in August averages around +90°F.
The average maximum temperature goes up 0% by the end of the month, compared with the beginning of the month, from +90°F to +90°F.
Is San Juan warm or cold in August?
San Juan is typically hot in August.
Maximum temperatures go up compared to the previous month from +88°F to +88°F. The minimum temperature also goes up from +79°F to +79°F.
Make sure that you pack your summer linen and swimming costumes; it’s probably going to be hot.
August is one of the warmest months in San Juan, here is the comparison with other months:
Water temperature in San Juan in August
Water in San Juan in August is Very warm. It varies from +83°F to +86°F, with an average of +84°F.This is almost similar to the air temperature, which averages +88°F.
The water temperature in August is one of the warmest of the entire year:
The warmest water temperatures in San Juan are reached in September, when the average sea temperature rises to +85°F. The coldest water temperatures are in February, with an average of +79°F.
Can you swim in San Juan in August?
You can definitely swim in San Juan in August, the water is very warm (+84°F in average), and might even be unpleasant for ones who like it more fresh.
🦭
Cold
Below +61°F
🏄♂️
Fresh
61°F - 70°F
🏊
Comfortable
70°F - 77°F
👙
Warm
77°F - 82°F
🔥
Very warm
+82°C and up
Don't forget sunscreen and a hat, it's going to be hot!
Climate in San Juan in August
San Juan weather looks like this, on average, in August and the surrounding months.
July
August
September
Avg. temperature
+88°F
+88°F
+88°F
Min. temperature
+73°F
+73°F
+73°F
Max. temperature
+95°F
+95°F
+95°F
Rainfall
84 mm
106 mm
148 mm
Wind
3 m/s
3 m/s
2 m/s
Avg. water temperature
+83°F
+84°F
+85°F
Humidity
78%
78%
78%
Air pressure
1016 HPa
1015 HPa
1013 HPa
Sunny days
1
1
1
Cloudy days
5
3
2
Rainy days
21
22
20
Snowy days
0
0
0
August weather is still as ok as in July.The temperature levels stay the same in the area of +88°F for average maximum temperature during the day.Prepare for more rain. Average rainfall goes from 84 mm to 106 mm.Humidity levels don’t change as the month goes on, averaging around 78%.The average wind speed doesn’t change much during August, staying around 3 m/s.The amount of sunny days stay about the same, averaging 1 sunny days during the month.
September brings much the same weather, it remains ok.
Wind speed in San Juan in August based on historical data.
Last Year
Historical Data
The average wind speed is 4 m/s getting up to 7 m/s which is a medium breeze. You can feel it, especially getting out of the water.
The average wind speed in San Juan is gradually increasing during August, going from 4 m/s to 4 m/s over the course of the month.
Rain
Amount of rainfall in mm during August in San Juan based on historical data.
Last Year
Historical Data
Typically, there is a 71% chance of rain on an average day in August, with total rainfall of approximately 315 mm. The maximum amount of rainfall per day is around 45 mm, which is moderate rain.August is a pretty wet month with over 22 rainy days, so don’t forget to pack an umbrella, raincoat, and a pair of wellies.
Here’s how August is compared with other months in the amount of precipitation, total mm:
San Juan wettest month is October, where a typical day has a 68% chance of precipitation and 151 mm of rainfall per day. January, on the other hand, is the driest month with a mere 68% chance of precipitation and 38 mm of rainfall per day.
How was the weather last August in San Juan?
This is the weather in San Juan in August 2023:
1 August
☁️
+90°F
2 August
☁️
+89°F
3 August
☁️
+89°F
4 August
☁️
+91°F
5 August
🌫️
+90°F
6 August
🌧️
+91°F
7 August
🌫️
+89°F
8 August
🌧️
+88°F
9 August
🌧️
+90°F
10 August
🌧️
+92°F
11 August
🌫️
+91°F
12 August
☁️
+87°F
13 August
☀️
+88°F
14 August
🌫️
+89°F
15 August
🌫️
+89°F
16 August
🌫️
+90°F
17 August
🌫️
+89°F
18 August
🌫️
+88°F
19 August
🌫️
+89°F
20 August
🌫️
+88°F
21 August
🌧️
+85°F
22 August
🌧️
+82°F
23 August
☁️
+91°F
24 August
☁️
+93°F
25 August
☁️
+87°F
26 August
🌧️
+91°F
27 August
☁️
+95°F
28 August
☁️
+94°F
29 August
☀️
+93°F
30 August
☁️
+93°F
31 August
🌫️
+89°F
In August 2023 San Juan had 2 sunny days, 11 cloudy days, and 7 rainy days. The average maximum temperature was +90°F, with an absolute maximum of +95°F and a minimum of +82°F. The average humidity was 83%, with a maximum of 96% and a minimum of 60%. The average wind speed was 4 m/s, with a maximum of 12 m/s and a minimum of 0 m/s.
Are you planning a trip in August?
Climate Change Over the Years
This is how San Juan climate has changed over the last 43 years.
The climate in San Juan in August has not changed that much over the last 43 years.
The average temperature was the lowest in 2008 (+84°F) and the highest in 2013 (+87°F). The driest year was 1994 with only 675 mm of rainfall, and the wettest year was 2023 with 2338 mm.
FAQ
Frequently asked questions about the weather in San Juan in August:
Is August a good time to visit San Juan?
It’s always a good time to visit San Juan, but the weather is changeable in August, so plan a mix of indoor and outdoor activities and exploring, and pack for every eventuality.
Can you sunbathe in San Juan in August?
Absolutely, August is hot in San Juan. Plan on beach and pool time, and ensure that you pack light and breathable options to stay comfortable.
Can you swim in San Juan in August?
Yes, you can swim in San Juan in August, the water is very warm, with temperature averaging at +84°F, but it's important to manage hydration and sun exposure.
Is San Juan rainy in August?
San Juan is often rainy in August. You may get a bit damp when outside, so pack an umbrella, and maybe even a raincoat.
Is it sunny in San Juan in August?
Usually, it’s not very sunny in San Juan in August, often it’s pretty cloudy. Pack for any eventuality; layering can help reduce the number of bulky items needed.
For this page, we’ve looked at the typical weather in San Juan, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.
