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San Sebastian Weather in August
August in San Sebastian averages 31°C (88°F) during the day and 25°C (77°F) at night. Quite a bit of rainfall is typical this month, with around 116 mm (4.6 in) on average. An umbrella is a good idea.
Rainfall in San Sebastian in August
Rain is expected on roughly 19 days, totalling around 116 mm (4.6 in) for the month. Rain falls regularly this month and can be quite heavy when it does. Showers can be substantial, so waterproof gear is a good idea.
Temperature in San Sebastian in August
Temperatures in San Sebastian in August top out at 31°C (88°F) and drop to 25°C (77°F) overnight. Sunshine and humidity can make it feel even warmer than the raw temperature suggests. Nights are warm at 25°C (77°F). It's worth making sure your accommodation has decent ventilation or air conditioning. Although these are the average temperatures, expect warmer days occasionally. Wear cool clothing and stay hydrated to manage the heat.August 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.
San Sebastian Temperature in August
Min Temperature
25°C (77°F)
Max Temperature
31°C (88°F)
Chance of Rain
62%
Precipitation
116 mm (4.6 in)
Rainy days
19 days
San Sebastian Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in San Sebastian - and find the best time to visit.
Daily Historical Temperatures
49-year average (1976-2025)
Based on our historical records, temperatures in San Sebastian typically stay consistent throughout August, with daily highs averaging around 31°C (88°F). Nights are warm, with lows around 24°C (75°F).
Average temperatures in August
Historical weather records for San Sebastian in August
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 August
Based on 29 years of weather observations in San Sebastian between 1997 and 2026, these are the recorded extremes.
- The hottest August day on record in San Sebastian reached 36°C (97°F) (August 17, 2007).
- On August 22, 2011, San Sebastian saw its coldest August day with temperatures maxing out at 25°C (77°F).
- The coldest night in August in San Sebastian was on August 27, 2025, with a minimum of 20°C (68°F).
Best Places in Puerto Rico in August
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 August →
perfect weather
pleasant
tolerable
unpleasant
poor
Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).
What to Wear in San Sebastian in August
Warm weather calls for comfortable, breathable clothing in August. 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 August
We rated the following activities from 1 (least suitable) to 10 (best) to do.
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Cycling7/10 -
Walking7/10 -
Camping6/10 -
Outdoor sports7/10
San Sebastian 3-Day Forecast
More climate data for San Sebastian
See the full San Sebastian climate overview or explore weather in Puerto Rico.
Popular in August
Where to go in August - average daytime high across popular destinations.
San Juan
31°C (88°F) Rio Grande
31°C (88°F) Aguada
30°C (86°F) Rincon30°C (86°F) Luquillo30°C (86°F) Culebra30°C (86°F) Vieques30°C (86°F) Fajardo
30°C (86°F) Bucket list
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