May weather forecast
San Marcos, El Salvador

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Weather in May

May presents a dramatic increase in rainfall to 267mm (10.51"); a significant upsurge from 53mm (2.09") experienced in April. This heavy rain, covering over 26 days, coupled with decreased sunshine hours, is a clear sign of the peak wet season. Outdoor activities may be compromised due to the high chances of getting caught in the rain. Furthermore, the increase in relative humidity to 76% can bring a rather muggy feel during this period. Conversely, a reduced wind speed adds a calming element to the intensified weather conditions.

Temperature

May's commencement is accompanied by an average high-temperature of a still tropical 31.8°C (89.2°F), diverging marginally from April's 33.4°C (92.1°F). Throughout May, San Marcos experiences a low-temperature average of 22.6°C (72.7°F).

Heat index

For May, the heat index is appraised at an extremely hot 42°C (107.6°F). Incorporate additional preventive steps, heat exhaustion and heat cramps are possible. Long-lasting activity may cause heatstroke.
Take note of the fact that heat index values are based on shaded circumstances with light airflows. Being exposed to direct sunshine might trigger a heat index increase by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'feels like', blends air temperature and moisture content to represent the felt temperature to humans. The impact of weather on an individual can be subjective, affected by the person's activity and heat perception, which can vary due to elements including wind, clothing, and metabolic differences. It is noteworthy that being in direct sunlight can enhance the weather's impact, raising the heat index by as much as 15 Fahrenheit (8 Celsius) degrees. Heat index values are quite important for children. Youngsters generally face more threats than adults given their lesser ability to sweat. Coupled with their larger skin surface relative to their small bodies and higher heat production due to their activities, they are more endangered.
The physiological response of the human body to excess warmth is to perspire, thereby cooling itself through sweat evaporation. Under high air temperature and humidity (high heat index) conditions, perspiration is limited, and the perception of heat is increased. If heat absorption isn't effectively countered by the body's cooling methods, body temperature surges, hinting at potential problems.

Humidity

In San Marcos, El Salvador, the average relative humidity in May is 76%.

Rainfall

May is the month with the most rainfall. Rain falls for 26.9 days and accumulates 267mm (10.51") of precipitation.

Daylight

The average length of the day in May is 12h and 46min.
On the first day of the month, sunrise is at 05:34 and sunset at 18:12. On the last day of May, sunrise is at 05:28 and sunset at 18:20 CST.

Sunshine

In San Marcos, the average sunshine in May is 10.7h.

UV index

The months with the lowest UV index are May through December, with an average maximum UV index of 6. A UV Index estimate of 6 to 7 represents a high health risk from exposure to the Sun's UV rays for ordinary individuals.
Note: A maximum high daily UV index of 6 during May translates into the following directions:
Eschew overexposure. Those with light skin may suffer burns in fewer than 20 minutes. Remember that the sun's UV radiation is strongest between 10 a.m. and 4 p.m. Make an effort to avoid direct sun exposure during these hours. Enhance your sun protection with tightly woven, yet airy clothing.

Frequently asked questions

How hot is May?

May temperatures vary between a high-temperature of 31.8°C (89.2°F) and a low-temperature of 22.6°C (72.7°F). The average heat index (a.k.a. 'apparent temperature', 'feels like'), which factors the actual air temperature with the relative humidity, in May is appraised at 42°C (107.6°F).

What is the average humidity in May in San Marcos?

The average relative humidity in May in San Marcos is 76%.

What is the wettest month?

The month with the most rainfall is May, when the rain falls for 26.9 days and typically aggregates up to 267mm (10.51") of precipitation.

How many days does it rain in May?

In May, the rain falls for 26.9 days. Throughout May, 267mm (10.51") of precipitation is accumulated.

What is the average length of the day in May?

The average day length in May is 12h and 46min.

When are sunrise and 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 18:20 CST.

How long on average sun shines in May?

In May, the average sunshine duration in San Marcos is 10.7h.

What are the months with the lowest UV index?

The months with the lowest UV index are May through December, with an average maximum UV index of 6.

How high is the UV index in May?

The average daily maximum UV index in May is 6. A UV Index reading of 6 to 7 represents a high health vulnerability from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in May
San Marcos, El Salvador

Average temperature in May - San Marcos, El Salvador
  • Average high temperature in May: 31.8°C

The warmest months (with the highest average high temperature) are March and April (33.4°C).
The month with the lowest average high temperature is October (29.7°C).

  • Average low temperature in May: 22.6°C

The month with the highest average low temperature is May (22.6°C).
The coldest month (with the lowest average low temperature) is January (19°C).

Average pressure in May
San Marcos, El Salvador

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

The month with the highest atmospheric pressure is January (1013.6mbar).
The months with the lowest atmospheric pressure are May and October (1011.3mbar).

Average wind speed in May
San Marcos, El Salvador

Average wind speed in May - San Marcos, El Salvador
  • Average wind speed in May: 4.7km/h

The windiest month (with the highest average wind speed) is January (8km/h).
The calmest month (with the lowest average wind speed) is June (4.4km/h).

Average humidity in May
San Marcos, El Salvador

Average humidity in May - San Marcos, 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 (61%).

Average rainfall in May
San Marcos, El Salvador

Average rainfall in May - San Marcos, El Salvador
  • Average rainfall in May: 267mm

The wettest month (with the highest rainfall) is May (267mm).
The driest month (with the least rainfall) is January (2mm).

Average rainfall days in May
San Marcos, El Salvador

Average rainfall days in May - San Marcos, El Salvador
  • Average rainfall days in May: 26.9 days

The month with the highest number of rainy days is May (26.9 days).
The month with the least rainy days is January (2.3 days).

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

Average daylight in May / Average sunshine in May - San Marcos, 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 4min

The month with the most sunshine is April (Average sunshine: 11h and 18min).
The months with the least sunshine are January and December (Average sunshine: 7h and 42min).

Average sunshine days in May
San Marcos, El Salvador

Average sunshine days in May - San Marcos, El Salvador
  • Average sunshine days in May: 2.7 days

The month with the most sunshine days is January (27.7 days).
The month with the least sunshine days is September (2.5 days).

Average UV index in May
San Marcos, El Salvador

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

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

Average cloud cover in May
San Marcos, El Salvador

Average cloud cover in May - San Marcos, El Salvador
  • Average cloud cover in May: 37

The month with the most cloud cover is September (Cloud cover 41).
The month with the least cloud cover is January (Cloud cover 13).

Average visibility in May
San Marcos, El Salvador

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

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

San Marcos, El Salvador

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