San Sebastian Weather in May
San Sebastian in May sees very high temperatures, with highs around 30°C (86°F) and overnight lows of 24°C (75°F). Rainfall is fairly high at around 143 mm (5.6 in) on average, so pack waterproofs just in case.
Rainfall in San Sebastian in May
You can expect rain on around 15 days based on historical patterns, with 143 mm (5.6 in) average for the month. When showers do arrive, they tend to be on the heavier side. Worth being prepared even if rain days are not that numerous.
Temperature in San Sebastian in May
May in San Sebastian sees highs of 30°C (86°F) and lows of 24°C (75°F) overnight. Mornings and evenings are often more comfortable than the peak afternoon hours. With overnight lows of 24°C (75°F), evenings and nights remain warm. Light clothing and an open window or fan can help you sleep comfortably.May in San Sebastian has its charm, but if you're looking for destinations with pleasant temperatures and sunny skies, our weather planner can help you explore other options in the world.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Puerto Rico, check out our San Sebastian's climate page.
San Sebastian Temperature in May
Min Temperature
24°C (75°F)
Max Temperature
30°C (86°F)
Chance of Rain
49%
Precipitation
143 mm (5.6 in)
Rainy days
15 days
Daily Historical Temperatures
49-year average (1976-2025)
Based on our historical records, temperatures in San Sebastian typically stay consistent throughout May, with daily highs averaging around 30°C (86°F). Nights are warm, with lows around 23°C (73°F).
Average temperatures in May
Historical weather for San Sebastian in May
Browse day-by-day weather records for San Sebastian spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
San Sebastian historical weather extremes in May
Based on 47 years of weather observations in San Sebastian between 1979 and 2026, these are the recorded extremes.
- On May 18, 1997, temperatures climbed to 37°C (99°F), marking the warmest May day on record.
- San Sebastian experienced its chilliest May day on May 20, 1979, reaching only 23°C (73°F).
- The lowest overnight temperature recorded in May was 19°C (66°F) (May 12, 2017).
Best Places in Puerto Rico in May
Find out more about the weather in Puerto Rico and which places have the best travel conditions in this month. See all of Puerto Rico in May →
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What to Wear in San Sebastian in May
Warm weather calls for comfortable, breathable clothing in May. Cotton t-shirts, shorts, light dresses, and sandals are perfect. You might still want a light layer for evenings or air-conditioned places (for example buses). High rain levels are expected, so pack waterproof gear and an umbrella or poncho.What To Do in San Sebastian in May
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Puerto Rico, check out our San Sebastian's climate page.
See the full San Sebastian climate overview or explore weather in Puerto Rico.
