nomadseason

May Weather in San Sebastian, El Salvador

Last updated: August 23, 2025

In May, the average temperature in San Sebastian, El Salvador reaches a warm 27°C (81°F), making it an inviting destination. Expect minimums around 20°C (69°F) and maximums peaking at 36°C (98°F). However, be prepared for some showers, as precipitation amounts to 311 mm (12.3 in) spread across 26 days. The average humidity sits at a comfortable 59%, adding to the tropical charm of the month!

May Temperature in San Sebastian

In May in San Sebastian, the average temperature is 27°C (81°F), with maximum highs reaching 36°C (98°F) and minimum lows dropping to 20°C (69°F). This climate makes San Sebastian an ideal destination for travelers looking to enjoy warm weather and outdoor activities.

May Weather in San Sebastian: Daily Temperature Highs, Lows, and Averages

The chart illustrates May temperature patterns in San Sebastian, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In San Sebastian, May typically has an average temperature of 27°C (81°F), with highs reaching up to 36°C (98°F) and lows dropping to around 20°C (69°F).
JanFebMarAprMayJunJulAugSepOctNovDec798182828079818079787979
Data source: Temperature data for San Sebastian generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

May Precipitation in San Sebastian

In San Sebastian in May, the precipitation amount is 311 mm (12.3 in) over a period of 26 days.

May Precipitation Trends in San Sebastian

The chart displays monthly precipitation patterns in San Sebastian, with values for each month alongside May’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how May’s conditions compare to those of other months. In San Sebastian, May typically receives around 311 mm (12.3 inches) of precipitation spread over approximately 26 days.
JanFebMarAprMayJunJulAugSepOctNovDec25553311303136240277314667
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

May Humidity in San Sebastian

In San Sebastian in May humidity is 59%. With an average temperature of 27°C (81°F), this humidity feels like a warm, tropical embrace, making it perfect for leisurely strolls but a bit sticky for extended outdoor activities.

May Average Humidity in San Sebastian

This chart illustrates the average monthly humidity levels in San Sebastian, with May’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In May, average humidity in San Sebastian is approximately 59%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec63%62%59%59%59%68%78%79%77%77%75%67%
Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in San Sebastian

In San Sebastian in May, the maximum UV index is 14, which corresponds to an extreme Exposure Category. The time to burn is just 10 minutes, so it's crucial to take precautions. For the detailed hourly UV index in San Sebastian, you can check here.

Maximum UV Index Levels in San Sebastian for May

The chart shows the monthly maximum UV Index (UVI) for San Sebastian in May, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In May, the maximum UV index in San Sebastian typically reaches 14, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec11121414141413131313109
Data source: San Sebastian May UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How May Weather in San Sebastian Compares to Other Months

Weather in San Sebastian varies notably across the year, with each month offering distinct climate conditions. This page compares May’s weather to other months in San Sebastian, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in San Sebastian, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather26°C (79°F)2 mm (0.1 inches)63%extreme
February Weather27°C (81°F)5 mm (0.2 inches)62%extreme
March Weather28°C (83°F)5 mm (0.2 inches)59%extreme
April Weather28°C (83°F)53 mm (2.1 inches)59%extreme
May Weather27°C (81°F)311 mm (12.3 inches)59%extreme
June Weather26°C (79°F)303 mm (11.9 inches)68%extreme
July Weather27°C (81°F)136 mm (5.4 inches)77%extreme
August Weather27°C (80°F)240 mm (9.5 inches)79%extreme
September Weather26°C (79°F)277 mm (10.9 inches)77%extreme
October Weather26°C (78°F)314 mm (12.3 inches)77%extreme
November Weather26°C (79°F)66 mm (2.6 inches)75%very high
December Weather26°C (79°F)7 mm (0.3 inches)66%very high

Compare San Sebastian's Climate with Cities Worldwide