December weather forecast
San Salvador, El Salvador

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 December

The first month of the winter, December, is still a warm month in San Salvador, El Salvador, with average temperature varying between 19.5°C (67.1°F) and 29.9°C (85.8°F).

Temperature

In December, the average high-temperature remains the same as in November - a still moderately hot 29.9°C (85.8°F). In San Salvador, the average low-temperature is 19.5°C (67.1°F).

Heat index

The average heat index is calculated to be a tropical 34.8°C (94.6°F). Take extra precautions, as heat cramps and heat exhaustion are possible. Sustained activity may result in heatstroke.
Take into consideration that the heat index values are calculated for shade and light wind conditions. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature', 'real feel', 'felt air temperature', or 'feels like', is a measure that combines air temperature and relative humidity into a single value that indicates how hot the weather feels. This effect is individual, with diverse people perceiving weather differently for numerous reasons (differences in body mass, height, and shape, wind, clothing), and activity. Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it is vital to remain hydrated, particularly during prolonged physical activities.

Humidity

In San Salvador, the average relative humidity is 70%.

Rainfall

In San Salvador, in December, during 2.3 rainfall days, 4mm (0.16") of precipitation is typically accumulated. In San Salvador, during the entire year, the rain falls for 187 days and collects up to 1106mm (43.54") of precipitation.

Daylight

With an average of 11.3h of daylight, December has the shortest days of the year in San Salvador.

Sunshine

January and December, with an average of 7.7h of sunshine, are months with the least sunshine.

UV index

January, May, June, August through December, with an average maximum UV index of 6, are months with the lowest UV index. A UV Index value of 6 to 7 symbolizes a high health vulnerability from the exposure to the Sun's UV radiation for average individuals.
Note: The average daily UV index of 6 in December transform into the following instructions:
Take precautions and adopt sun safety practices. Protection against sunburn is obliged. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.
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FAQ

What is the temperature in December in San Salvador?

In San Salvador, in December, the average high-temperature is 29.9°C (85.8°F), and the average low-temperature is 19.5°C (67.1°F). The average heat index (a.k.a. 'feels like', 'felt air temperature'), which takes the relative humidity and factors it into the air temperature reading, in December is calculated to be 34.8°C (94.6°F).

What is the average humidity in December in San Salvador?

In December, the average relative humidity is 70%.

How much does it rain in San Salvador in December?

In San Salvador, El Salvador, in December, it is raining for 2.3 days, with typically 4mm (0.16") of accumulated precipitation.

What is the month with the shortest days in San Salvador?

With an average of 11.3h of daylight, December has the shortest days of the year in San Salvador, El Salvador.

How many hours of daylight does San Salvador have in December?

The average length of the day in December in San Salvador, El Salvador, is 11.3h.

What is the month with the least sunshine in San Salvador?

January and December, with an average of 7.7h of sunshine, are months with the least sunshine.

How long on average sun shines in December in San Salvador?

In San Salvador, El Salvador, the average sunshine in December is 7.7h.

What is the month with the lowest UV index in San Salvador?

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

What is the UV index intensity in December in San Salvador?

In San Salvador, El Salvador, the average daily maximum UV index in December is 6. A UV Index estimate of 6 to 7 represents a high hazard to health from unprotected exposure to the UV radiation.

Average temperature in December
San Salvador, El Salvador

Average temperature in December - San Salvador, El Salvador
  • Average high temperature in December: 29.9°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 December: 19.5°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).

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Average pressure in December
San Salvador, El Salvador

Average pressure in December - San Salvador, El Salvador
  • Average pressure in December: 1013mbar

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

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Average wind speed in December
San Salvador, El Salvador

Average wind speed in December - San Salvador, El Salvador
  • Average wind speed in December: 7.9km/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).

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Average humidity in December
San Salvador, El Salvador

Average humidity in December - San Salvador, El Salvador
  • Average humidity in December: 70%

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

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Average rainfall in December
San Salvador, El Salvador

Average rainfall in December - San Salvador, El Salvador
  • Average rainfall in December: 4mm

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

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Average rainfall days in December
San Salvador, El Salvador

Average rainfall days in December - San Salvador, El Salvador
  • Average rainfall days in December: 2.3 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).

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

Average daylight in December / Average sunshine in December - San Salvador, El Salvador
  • Average daylight in December: 11.3h

The month with the longest days is June (Average daylight: 12.9h).
The month with the shortest days is December (Average daylight: 11.3h).

  • Average sunshine in December: 7.7h

The month with the most sunshine is April (Average sunshine: 11.4h).
Months with the least sunshine are January and December (Average sunshine: 7.7).

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Average sunshine days in December
San Salvador, El Salvador

Average sunshine days in December - San Salvador, El Salvador
  • Average sunshine days in December: 28.5 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).

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Average UV index in December
San Salvador, El Salvador

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

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

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Average cloud cover in December
San Salvador, El Salvador

Average cloud cover in December - San Salvador, El Salvador
  • Average cloud cover in December: 14

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).

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Average visibility in December
San Salvador, El Salvador

Average visibility in December - San Salvador, El Salvador
  • Average visibility in December: 10km

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

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