May weather forecast
San Salvador, El Salvador

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The sunlit San Salvador city in El Salvador set on the beautiful slopes of the mountain
The sunlit San Salvador city in El Salvador set on the beautiful slopes of the mountain

Weather in May

May marks the beginning of the rainy season in San Salvador. The temperatures stay steady but the spike in relative humidity to 76% from last month’s 67% makes the city feel significantly wetter. A decline in visibility coincides with the increased rainfall and cloud cover. Despite these changes, individuals still benefit from approximately 12.8 hours of daily daylight. Most notably, the month's total rainfall surges to a maximum of 234mm (9.21") over 25.5 days.

Temperature

April's transformation into May witnesses an average high-temperature of a still hot 30.9°C (87.6°F), noting a minor change from the preceding month. San Salvador's nighttime temperature in May falls to an average of 22.7°C (72.9°F).

Heat index

The average heat index in May is calculated to be a torrid 39°C (102.2°F). Take extra safety measures to prevent heat exhaustion and heat cramps. Heatstroke could follow lengthy activity.
Evaluating the heat index requires understanding its values in the shade and with gentle winds. Exposure to unobstructed sunshine could lead to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'feels like', is a calculation that merges air temperature and relative humidity to depict the sensation of warmth. An individual's perception of weather can be influenced by a variety of factors including metabolic differences, being pregnant, and their degree of physical exertion. When you're directly under the sun's rays, remember that the heat index may surge by 15 Fahrenheit (8 Celsius) degrees. Heat index values hold particular importance for children. Children often fail to recognize the requirement to rest and rehydrate. Thirst, being a late symptom of dehydration, underlines the importance of maintaining hydration, especially during ongoing physical activities.
Perspiration, which is the evaporation of sweat, is a primary way the human body manages and dispels excessive warmth. In the presence of abundant moisture in the atmosphere, the cooling process through evaporation is hindered, causing the body to feel excessively warm. When body heat isn't effectively managed, risks of dehydration and overheating amplify.

Humidity

The average relative humidity in May is 76%.

Rainfall

The month with the most rainfall is May, when the rain falls for 25.5 days and typically aggregates up to 234mm (9.21") of precipitation.

Daylight

In San Salvador, the average length of the day in May is 12h and 46min.
On the first day of May, sunrise is at 05:34 and sunset at 18:12. On the last day of the month, sunrise is at 05:28 and sunset at 18:21 CST.

Sunshine

In San Salvador, the average sunshine in May is 10.8h.

UV index

The months with the lowest UV index are January, May, June, August through December, with an average maximum UV index of 6. A UV Index of 6 to 7 symbolizes a high health hazard from unprotected exposure to Sun's UV rays for the ordinary person.
Note: A daily high UV index of 6 in May leads to these guidelines:
Persist in precautions and follow sun safety policies. Keeping sunburn at bay is imperative. Stay out of direct sunlight between 10 a.m. and 4 p.m., when UV radiation is most intense, and remember that not all shade structures provide complete protection. Counter UV radiation's ill effects with clothing designed for sun safety and UV-resistant eyewear.

Frequently asked questions

Is it hot during May?

In San Salvador, in May, the average high-temperature is 30.9°C (87.6°F), and the average low-temperature is 22.7°C (72.9°F). In May, the average heat index (a.k.a. 'real feel', 'apparent temperature'), which factors the actual air temperature with the relative humidity, is calculated to be 39°C (102.2°F).

What is the average humidity in May?

The average relative humidity in May is 76%.

What is the rainiest month in San Salvador?

May is the month with the most rainfall. Rain falls for 25.5 days and accumulates 234mm (9.21") of precipitation.

How many days does it rain in May?

In San Salvador, in May, it is raining for 25.5 days, with typically 234mm (9.21") of accumulated precipitation.

What is the average length of the day in May?

In May, the average day length is 12h and 46min.

When is the sunrise / sunset in May?

In May, on the first day of the month, sunrise is at 05:34 and sunset at 18:12. On the last day of the month, sunrise is at 05:28 and sunset at 18:21 CST.

How many hours of sunshine does San Salvador have in May?

In San Salvador, the average sunshine duration in May is 10.8h.

What are the months with the lowest UV index?

The months with the lowest UV index in San Salvador are January, May, June, August through December, with an average maximum UV index of 6.

What is the UV index reading in May?

In San Salvador, the average daily maximum UV index in May is 6. A UV Index value of 6 to 7 symbolizes a high hazard to health from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover

Average temperature in May
San Salvador, El Salvador

Average temperature in May - San Salvador, El Salvador
  • Average high temperature in May: 30.9°C

The warmest month (with the highest average high temperature) is March (32.6°C).
The month with the lowest average high temperature is October (29°C).

  • Average low temperature in May: 22.7°C

The month with the highest average low temperature is April (22.8°C).
The coldest month (with the lowest average low temperature) is January (19.4°C).

Average pressure in May
San Salvador, El Salvador

Average pressure in May - San Salvador, El Salvador
  • Average pressure in May: 1011.3mbar

The month with the highest atmospheric pressure is January (1013.5mbar).
The months with the lowest atmospheric pressure are May and October (1011.3mbar).

Average wind speed in May
San Salvador, El Salvador

Average wind speed in May - San Salvador, El Salvador
  • Average wind speed in May: 5.1km/h

The windiest month (with the highest average wind speed) is January (8.5km/h).
The calmest month (with the lowest average wind speed) is June (4.8km/h).

Average humidity in May
San Salvador, El Salvador

Average humidity in May - San Salvador, El Salvador
  • Average humidity in May: 76%

The months with the highest relative humidity are September and October (82%).
The month with the lowest relative humidity is March (62%).

Average rainfall in May
San Salvador, El Salvador

Average rainfall in May - San Salvador, El Salvador
  • Average rainfall in May: 234mm

The wettest month (with the highest rainfall) is May (234mm).
The driest month (with the least rainfall) is January (1mm).

Average rainfall days in May
San Salvador, El Salvador

Average rainfall days in May - San Salvador, El Salvador
  • Average rainfall days in May: 25.5 days

The month with the highest number of rainy days is September (26.3 days).
The month with the least rainy days is January (1.9 days).

Average daylight in May /
Average sunshine in May
San Salvador, El Salvador

Average daylight in May / Average sunshine in May - San Salvador, El Salvador
  • Average daylight in May: 12h and 5min

The month with the longest days is June (Average daylight: 12h and 54min).
The month with the shortest days is December (Average daylight: 11h and 18min).

  • Average sunshine in May: 10h and 5min

The month with the most sunshine is April (Average sunshine: 11h and 24min).
The months with the least sunshine are January and December (Average sunshine: 7h and 42min).

Average sunshine days in May
San Salvador, El Salvador

Average sunshine days in May - San Salvador, El Salvador
  • Average sunshine days in May: 4.5 days

The month with the most sunshine days is January (28.7 days).
The month with the least sunshine days is September (3.2 days).

Average UV index in May
San Salvador, El Salvador

Average UV index in May - San Salvador, El Salvador
  • Average UV index in May: 6

The months with the highest UV index are February, March, April and July (UV index 7).
The months with the lowest UV index are January, May, June, August, September, October, November and December (UV index 6).

Average cloud cover in May
San Salvador, El Salvador

Average cloud cover in May - San Salvador, El Salvador
  • Average cloud cover in May: 36

The months with the most cloud cover are June, September and October (Cloud cover 38).
The month with the least cloud cover is January (Cloud cover 13).

Average visibility in May
San Salvador, El Salvador

Average visibility in May - San Salvador, El Salvador
  • Average visibility in May: 9km

The months with the highest visibility are January, February, March, April, November and December (10km).
The months with the lowest visibility are September and October (8km).

San Salvador, El Salvador

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