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When is the best time to visit San Juan?
In general the best time to visit San Juan is probably September, when the weather is usually great. The hottest months are July, August, September, while the coldest months are January, February, March.
Depending on the activities you want to experience, you may choose different months to visit:
- The best time for a sun tanning holiday is July, August, September. Average maximum temperatures are up to +88°F in September and it has 1 sunny days on average.
- In general, it’s pleasant to walk and do outdoor activities during January - December.
- If you want to avoid wet weather, then your choice is October, November, December with the lowest chance of rain.
Average weather in San Juan in different months
This is the average weather in San Juan for each month based on historic data:
January, February, March, April, December usually has good weather. Average maximum temperature reaches +84°F during April.
In May, June, July, August, September, October, November the weather is average. Expect around 149 rainy days, and the precipitation amounts to approximately 151 mm in October.
Climate in San Juan
Here is the detailed breakdown of the climate in San Juan for each month:
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Maximum Temperature | |||||||||||
| +88°F | +90°F | +91°F | +91°F | +91°F | +95°F | +95°F | +95°F | +95°F | +97°F | +93°F | +93°F |
| Average Maximum Temperature | |||||||||||
| +82°F | +82°F | +82°F | +84°F | +86°F | +88°F | +88°F | +88°F | +88°F | +86°F | +84°F | +82°F |
| Minimum Temperature | |||||||||||
| +66°F | +66°F | +68°F | +70°F | +46°F | +72°F | +73°F | +73°F | +73°F | +73°F | +70°F | +68°F |
| Avg. water temperature | |||||||||||
| +81°F | +80°F | +80°F | +82°F | +82°F | +84°F | +85°F | +86°F | +86°F | +86°F | +84°F | +83°F |
| Humidity, % | |||||||||||
| 77 | 75 | 73 | 74 | 77 | 77 | 78 | 78 | 78 | 78 | 79 | 78 |
| Rain, mm | |||||||||||
| 38 | 38 | 49 | 94 | 146 | 79 | 84 | 106 | 148 | 151 | 106 | 48 |
| Snow, mm | |||||||||||
| 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Average wind speed, m/s | |||||||||||
| 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 2 | 2 | 2 | 2 |
| Sunny Days | |||||||||||
| 2 | 2 | 3 | 2 | 1 | 2 | 1 | 1 | 1 | 1 | 1 | 2 |
| Cloud Days | |||||||||||
| 8 | 7 | 7 | 5 | 4 | 5 | 5 | 3 | 2 | 3 | 4 | 7 |
| Rainy Days | |||||||||||
| 21 | 19 | 21 | 23 | 22 | 20 | 21 | 22 | 20 | 21 | 23 | 21 |
| Snowy Days | |||||||||||
| 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Average Temperature
Here are the average maximum and minimum temperatures in San Juan during the whole year:
The hottest month in San Juan is September with average maximum temperature going up to +88°F. The coldest month is January with the lowest temperatures of +73°F.
Water temperature
Here are the water temperatures in San Juan during the whole year:
San Juan achieves its warmest water temperature in September, where the average sea temperature goes up to +85°F. Coldest water temperature is in February with +79°F in average.
When can you swim in San Juan?
You can swim in San Juan from January to December:
- In June - November the water is very warm (82°F);
- In January - May the water is warm (77°F - 82°F);
Humidity
The temperature feels different depending on humidity. Here is how humidity in San Juan looks throughout the year, in %:
The most humid month in San Juan is November with average humidity going up to 79%. The least humid month is March with an average humidity of 73%.
Rain
Amount of rainfall in mm. in San Juan during the whole year based on historical data:
The sunniest and driest month is March with approximately 3 sunny days and a total precipitation of around 49 mm. The rainiest and wettest month is October with approximately 21 rainy days and 151 mm of total precipitation.
FAQ
Frequently asked questions about the weather in San Juan:
What is the hottest month in San Juan?
The hottest month in San Juan is September with average maximum temperature of +88°F.
What is the coldest month in San Juan?
The coldest month in San Juan is January with minimum temperatures of +73°F.
Is San Juan worth visiting in winter?
If you are planning to visit San Juan in winter you can expect pretty good weather. The best month is September with +88°F and 1 sunny days.
When does it rain the least in San Juan?
if you're looking to visit San Juan when it rains the least, you should plan your trip for October, September, May. During this time, rainfall is rare with the driest month being January with only 38 mm of rain.
Monthly weather in San Juan
Source of the data
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.