Weather in San Juan in May 2025
Average weather
Average temperature in San Juan in May
Going from a maximum of +91°F during the day to a minimum of +73°F during the night, the temperature in May 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 +91°F to +91°F.
Is San Juan warm or cold in May?
San Juan is typically warm in May.
Maximum temperatures go up compared to the previous month from +84°F to +86°F. The minimum temperature also goes up from +73°F to +75°F.
It’s generally warm, but pack a long-sleeve shirt for evenings.
Take a look at how May is compared to other months in San Juan:
Water temperature in San Juan in May
Water in San Juan in May is Warm. It varies from +80°F to +82°F, with an average of +81°F. This is almost similar to the air temperature, which averages +86°F.
In May, water temperatures are average relative to the rest of the year:
Can you swim in San Juan in May?
Climate in San Juan in May
| April | May | June | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +84°F | +86°F | +88°F | ||||
| Min. temperature | ||||||
| +70°F | +46°F | +72°F | ||||
| Max. temperature | ||||||
| +91°F | +91°F | +95°F | ||||
| Rainfall | ||||||
| 94 mm | 146 mm | 79 mm | ||||
| Wind | ||||||
| 3 m/s | 3 m/s | 3 m/s | ||||
| Avg. water temperature | ||||||
| +80°F | +81°F | +83°F | ||||
| Humidity | ||||||
| 74% | 77% | 77% | ||||
| Air pressure | ||||||
| 1015 HPa | 1015 HPa | 1016 HPa | ||||
| Sunny days | ||||||
| 2 | 1 | 2 | ||||
| Cloudy days | ||||||
| 5 | 4 | 5 | ||||
| Rainy days | ||||||
| 23 | 22 | 20 | ||||
| Snowy days | ||||||
| 0 | 0 | 0 | ||||
May typically has worse weather conditions compared to April. It’s getting warmer as May arrives. The average maximum temperature goes up from +84°F to +86°F during the day. Prepare for more rain. Average rainfall goes from 94 mm to 146 mm. Humidity rises from 74% to 77%. The average wind speed doesn’t change much during May, staying around 3 m/s. The days becoming less sunny, going from 2 sunny days in April to 1 in May.
June brings much the same weather, it remains ok.
Wind
The average wind speed is 3 m/s getting up to 5 m/s which is a light breeze; barely moving the tree leaves.
The average wind speed in San Juan is gradually increasing during May, going from 3 m/s to 3 m/s over the course of the month.
Rain
How was the weather last May in San Juan?
Climate Change Over the Years
The climate in San Juan in May 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
Is May a good time to visit San Juan?
Can you sunbathe in San Juan in May?
Can you swim in San Juan in May?
Is San Juan rainy in May?
Is it sunny in San Juan in May?
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.