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May Weather in Santo Tomas, El Salvador

Last updated: August 23, 2025

In May, the average temperature in Santo Tomas, El Salvador hovers around 27°C (80°F). Expect minimums of 20°C (69°F) and maximums reaching 36°C (97°F). This month also brings considerable precipitation, with an average of 269 mm (10.6 in) spread over 26 days. With an average humidity of 59%, it’s a time to embrace the warmth while being prepared for those occasional showers!

May Temperature in Santo Tomas

In May in Santo Tomas, the average temperature is 27°C (80°F). Maximums can reach 36°C (97°F), while minimums can be as low as 20°C (69°F). This pleasant climate makes Santo Tomas an ideal destination for outdoor activities and exploration.

May Weather in Santo Tomas: Daily Temperature Highs, Lows, and Averages

The chart illustrates May temperature patterns in Santo Tomas, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Santo Tomas, May typically has an average temperature of 27°C (80°F), with highs reaching up to 36°C (97°F) and lows dropping to around 20°C (69°F).
JanFebMarAprMayJunJulAugSepOctNovDec777981818078808078787877
Data source: Temperature data for Santo Tomas generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

May Precipitation in Santo Tomas

In Santo Tomas in May, the total precipitation amount is 269 mm (10.6 in) spread over 26 days.

May Precipitation Trends in Santo Tomas

The chart displays monthly precipitation patterns in Santo Tomas, 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 Santo Tomas, May typically receives around 269 mm (10.6 inches) of precipitation spread over approximately 26 days.
JanFebMarAprMayJunJulAugSepOctNovDec34559269292157252301272587
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Santo Tomas

In Santo Tomas in May, humidity is 59%. With an average temperature of 27°C (80°F), this humidity feels like a warm embrace, making it essential for travelers to stay hydrated while exploring the vibrant surroundings.

May Average Humidity in Santo Tomas

This chart illustrates the average monthly humidity levels in Santo Tomas, 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 Santo Tomas 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 Santo Tomas

In Santo Tomas 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 Santo Tomas, you can check here.

Maximum UV Index Levels in Santo Tomas for May

The chart shows the monthly maximum UV Index (UVI) for Santo Tomas 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 Santo Tomas typically reaches 14, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec11121414141413131313109
Data source: Santo Tomas 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 Santo Tomas Compares to Other Months

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

This table compares monthly weather conditions in Santo Tomas, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather25°C (78°F)3 mm (0.1 inches)63%extreme
February Weather26°C (79°F)4 mm (0.2 inches)62%extreme
March Weather27°C (81°F)5 mm (0.2 inches)59%extreme
April Weather27°C (81°F)59 mm (2.3 inches)59%extreme
May Weather27°C (80°F)269 mm (10.6 inches)59%extreme
June Weather26°C (79°F)292 mm (11.5 inches)68%extreme
July Weather27°C (80°F)157 mm (6.2 inches)77%extreme
August Weather26°C (80°F)252 mm (9.9 inches)79%extreme
September Weather26°C (79°F)301 mm (11.9 inches)77%extreme
October Weather25°C (78°F)272 mm (10.7 inches)77%extreme
November Weather25°C (78°F)58 mm (2.3 inches)75%very high
December Weather25°C (78°F)7 mm (0.3 inches)66%very high

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