Our verdict
The best time to visit San Juan is April-June
In summer, the temperature in San Juan can rise as high as 31℃ (87℉). The coldest it usually gets in winter-time in San Juan is around 22℃ (72℉).
If you want to get the most out of your time visiting San Juan, or you’re just afraid of the dark, the days in June are usually the longest between sunrise and sunset. The wet season in San Juan falls around November, so if you prefer the dryer weather, you should look to visit in June instead.
Learn everything you need to know to help you decide when to go to San Juan below, and don’t forget to use the awesome travel tools we know and love to help you find the best deals and make booking your vacation a breeze!
Quick links: Fast facts / Seasons / Average temperatures / Monthly climate / FAQs / Map
San Juan seasons
Before you continue, it’s important to know when the seasons are in San Juan as they might be different to yours depending on where in the world you’re travelling from. San Juan is in the Northern Hemisphere, so the seasons fall during these months:
| Season | Months |
|---|---|
| Summer | June to August |
| Autumn/fall | September to November |
| Winter | December to February |
| Spring | March to May |
Average temperatures in San Juan
If the temperature is a big factor for you to help you decide when to visit, the chart below shows the average minimum and maximum temperatures in San Juan for each month side-by-side so you can easily see the difference in weather throughout the year. To see the temperatures in both Celsius (°C) and Fahrenheit (°F), hover or tap the shaded boxes on the graph.
San Juan climate by month
If you already have a rough idea about which months you might want to travel, the section below shows a detailed breakdown of the climate in San Juan for each month so you can see if it all suits your wants and needs. Scroll down, or use the quick menu below to jump to your preferred month.
Jump to:
San Juan in January
- Average temperature: 25℃ (77℉)
- Average high temperature: 27℃ (80℉)
- Average low temperature: 24℃ (75℉)
- Average humidity: 77%
- Average sunny days: 11 days
- Average rainfall: 21mm (1") over 12 days
of pure sunshine
of showers or rain
What to pack: If you’re heading to San Juan in January, make sure you pack t-shirts and light clothing.
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San Juan in February
- Average temperature: 25℃ (77℉)
- Average high temperature: 27℃ (80℉)
- Average low temperature: 23℃ (74℉)
- Average humidity: 76%
- Average sunny days: 10 days
- Average rainfall: 15mm (1") over 12 days
of pure sunshine
of showers or rain
What to pack: If you’re heading to San Juan in February, make sure you pack t-shirts and light clothing.
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San Juan in March
- Average temperature: 25℃ (77℉)
- Average high temperature: 27℃ (80℉)
- Average low temperature: 23℃ (74℉)
- Average humidity: 76%
- Average sunny days: 12 days
- Average rainfall: 22mm (1") over 13 days
of pure sunshine
of showers or rain
What to pack: If you’re heading to San Juan in March, make sure you pack t-shirts and light clothing.
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San Juan in April
- Average temperature: 26℃ (78℉)
- Average high temperature: 27℃ (81℉)
- Average low temperature: 24℃ (75℉)
- Average humidity: 77%
- Average sunny days: 11 days
- Average rainfall: 14mm (1") over 12 days
of pure sunshine
of showers or rain
What to pack: If you’re heading to San Juan in April, make sure you pack t-shirts and light clothing.
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San Juan in May
- Average temperature: 27℃ (80℉)
- Average high temperature: 28℃ (83℉)
- Average low temperature: 25℃ (77℉)
- Average humidity: 79%
- Average sunny days: 11 days
- Average rainfall: 27mm (1") over 15 days
of pure sunshine
of showers or rain
What to pack: If you’re heading to San Juan in May, make sure you pack t-shirts and light clothing.
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San Juan in June
- Average temperature: 27℃ (81℉)
- Average high temperature: 29℃ (84℉)
- Average low temperature: 26℃ (78℉)
- Average humidity: 79%
- Average sunny days: 15 days
- Average rainfall: 14mm (1") over 9 days
of pure sunshine
of showers or rain
What to pack: If you’re heading to San Juan in June, make sure you pack t-shirts and light clothing.
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San Juan in July
- Average temperature: 28℃ (82℉)
- Average high temperature: 29℃ (84℉)
- Average low temperature: 26℃ (79℉)
- Average humidity: 79%
- Average sunny days: 11 days
- Average rainfall: 17mm (1") over 12 days
of pure sunshine
of showers or rain
What to pack: If you’re heading to San Juan in July, make sure you pack t-shirts and light clothing.
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San Juan in August
- Average temperature: 28℃ (82℉)
- Average high temperature: 29℃ (85℉)
- Average low temperature: 26℃ (80℉)
- Average humidity: 78%
- Average sunny days: 11 days
- Average rainfall: 22mm (1") over 13 days
of pure sunshine
of showers or rain
What to pack: If you’re heading to San Juan in August, make sure you pack t-shirts and light clothing.
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San Juan in September
- Average temperature: 28℃ (82℉)
- Average high temperature: 29℃ (85℉)
- Average low temperature: 26℃ (79℉)
- Average humidity: 78%
- Average sunny days: 12 days
- Average rainfall: 30mm (1") over 12 days
of pure sunshine
of showers or rain
What to pack: If you’re heading to San Juan in September, make sure you pack t-shirts and light clothing.
San Juan in October
- Average temperature: 28℃ (82℉)
- Average high temperature: 29℃ (85℉)
- Average low temperature: 26℃ (79℉)
- Average humidity: 78%
- Average sunny days: 10 days
- Average rainfall: 38mm (1") over 16 days
of pure sunshine
of showers or rain
What to pack: If you’re heading to San Juan in October, make sure you pack t-shirts and light clothing.
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San Juan in November
- Average temperature: 27℃ (80℉)
- Average high temperature: 28℃ (83℉)
- Average low temperature: 25℃ (78℉)
- Average humidity: 78%
- Average sunny days: 9 days
- Average rainfall: 40mm (2") over 16 days
of pure sunshine
of showers or rain
What to pack: If you’re heading to San Juan in November, make sure you pack t-shirts and light clothing.
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San Juan in December
- Average temperature: 26℃ (78℉)
- Average high temperature: 27℃ (81℉)
- Average low temperature: 25℃ (76℉)
- Average humidity: 77%
- Average sunny days: 9 days
- Average rainfall: 25mm (1") over 15 days
of pure sunshine
of showers or rain
What to pack: If you’re heading to San Juan in December, make sure you pack t-shirts and light clothing.
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