San Sebastian Temperature by Month
San Sebastian, Puerto Rico has a consistently very warm climate year-round, with daytime highs averaging 30°C (86°F). Below you'll find a full monthly breakdown and a comparison with cities worldwide.
San Sebastian Monthly Temperatures
Year-round, San Sebastian experiences a consistently very warm climate. Maximum daytime temperatures range from a very warm 32°C (90°F) in July to a comfortable 29°C (84°F) in the coolest month, February. Nighttime temperatures range from 25°C (77°F) in July to 22°C (72°F) in February.
The chart below illustrates the average maximum day and minimum night temperatures in San Sebastian by month:
Low temperatures are most often recorded between 4 AM and 6 AM, while highs typically occur around 3 PM.
The chart below shows the average temperature throughout the year:
Daily Historical Temperatures
49-year average (1976-2025)
Average high and low temperatures for each day of the month based on long-term records.
Average temperatures in June
Historical San Sebastian Temperatures: 1976-2026
Browse day-by-day temperature records for San Sebastian spanning 51 years. Select any month and year to see actual high and low temperatures recorded on each day.
Temperature: San Sebastian vs Puerto Rico
The map below shows the annual temperature across Puerto Rico. You can also select individual months if you want to compare a specific time of year.
very warm
warm
pleasant
moderate
cold
very cold
San Sebastian vs World: Temperature Compared
San Sebastian's average annual maximum temperature is 30°C (86°F). To put that in context, here's how it compares to a few well-known destinations:
Athens, Greece sits at 23°C (73°F) on average, with hot dry summers and mild winters characteristic of the Mediterranean.
On the cooler end, Oslo, Norway averages just 10°C (50°F) annually, with pleasant summers but long, cold winters.
New York City, USA averages 17°C (63°F) a year, with hot humid summers and cold winters that bring regular snowfall.
Tokyo, Japan averages 21°C (70°F) a year, with hot summers, cool winters, and a well-defined cherry blossom spring.
Climate temperature data is typically calculated as a 30-year average. This smooths out year-to-year variability and gives a more reliable picture of what a place is actually like, rather than what happened in any single unusual year.
The readings come from a range of sources — land-based weather stations, ocean buoys, ships, and satellites. That data is collected by weather services around the world, then pooled, quality-checked, and averaged to produce the climate records you see here.
Seasonal temperature shifts influence more than just how warm it feels — they also drive changes in rainfall, cloud cover, and wind patterns throughout the year.
Warmer air holds more moisture, which tends to mean heavier or more frequent rain during the warmer months. When temperatures drop in winter, any precipitation that does fall is more likely to come as snow or sleet, though in San Sebastian this rarely lasts long on the ground.
For more on San Sebastian's weather — including monthly rainfall, sunshine hours, and humidity — visit our San Sebastian climate page.
