September 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 September

September, the first month of the autumn in San Salvador, is also a moderately hot month, with an average temperature varying between 29.8°C (85.6°F) and 21.5°C (70.7°F).

Temperature

In September, the average high-temperature is almost the same as in August - a warm 29.8°C (85.6°F). The average low-temperature, in September, is 21.5°C (70.7°F).

Heat index

In September, the average heat index is evaluated at a very hot 37.6°C (99.7°F). Take extra precautions, as heat cramps and heat exhaustion are possible. Sustained activity may result in heatstroke.
Note that heat index values are valued for light wind and location in the shade. With exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature', 'apparent temperature', 'real feel', or 'feels like', is a calculated temperature value of how hot it feels when the moisture in the air is factored in. Additional factors like clothing, differences in body mass, height, and shape, pregnancy, and activity influence one's weather impression. 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. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.
The human body cools itself through perspiration, as excessive warmth is removed from the body through sweat evaporation. With a lot of moisture in the air, the evaporation process is not as effective, and the body does not cool down as efficiently, creating a perception of overheating. If the body can not disperse the excessive heat and body temperature reaches conditions of hyperthermia, above 37.5°C (99.5°F) to 38.3°C (100.9°F), thermal conditions are potentially life-threatening.

Humidity

September and October, with an average relative humidity of 82%, are the most humid months in San Salvador.

Rainfall

In San Salvador, it is raining for 26.3 days, with typically 142mm (5.59") of accumulated precipitation. In San Salvador, during the entire year, the rain falls for 187 days and collects up to 1106mm (43.54") of precipitation.

Daylight

In September, the average length of the day in San Salvador is 12h and 12min.
On the first day of the month, sunrise is at 05:45 and sunset at 18:08. On the last day of September, sunrise is at 05:46 and sunset at 17:47 CST.

Sunshine

In San Salvador, the average sunshine in September is 9.3h.

UV index

January, May, June, August through December, with an average maximum UV index of 6, are months with the lowest UV index in San Salvador. A UV Index reading of 6 to 7 represents a high health vulnerability from unsafe exposure to UV radiation for average individuals.
Note: The daily maximum UV index of 6 in September interpret into the following advice:
Take precautions against overexposure. Protection against sun damage is needed. 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. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
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FAQ

What is the temperature in September in San Salvador?

The average high-temperature, in September, in San Salvador, El Salvador, is 29.8°C (85.6°F), while the average low-temperature is 21.5°C (70.7°F). In September, the average heat index (a.k.a. 'feels like', 'apparent temperature'), which combines relative humidity and air temperature, is evaluated at 37.6°C (99.7°F).

What are the most humid months in San Salvador?

September and October, with an average relative humidity of 82%, are most humid months in San Salvador, El Salvador.

What is the average humidity in September in San Salvador?

In San Salvador, the average relative humidity in September is 82%.

How many days does it rain in September in San Salvador?

In September, in San Salvador, El Salvador, the rain falls for 26.3 days. Throughout September, 142mm (5.59") of precipitation is accumulated.

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

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

When are sunrise and sunset in September in San Salvador?

In September, on the first day of the month, sunrise is at 05:45 and sunset at 18:08. On the last day of the month, sunrise is at 05:46 and sunset at 17:47 CST.

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

The average sunshine duration in September in San Salvador is 9.3h.

When is the lowest UV index in San Salvador?

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

What is the UV index reading in September in San Salvador?

The average daily maximum UV index in September is 6. A UV Index of 6 to 7 symbolizes a high health vulnerability from unprotected exposure to UV radiation.

Average temperature in September
San Salvador, El Salvador

Average temperature in September - San Salvador, El Salvador
  • Average high temperature in September: 29.8°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 September: 21.5°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 September
San Salvador, El Salvador

Average pressure in September - San Salvador, El Salvador
  • Average pressure in September: 1011.4mbar

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

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Average wind speed in September
San Salvador, El Salvador

Average wind speed in September - San Salvador, El Salvador
  • Average wind speed in September: 4.9km/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 September
San Salvador, El Salvador

Average humidity in September - San Salvador, El Salvador
  • Average humidity in September: 82%

The 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 September
San Salvador, El Salvador

Average rainfall in September - San Salvador, El Salvador
  • Average rainfall in September: 142mm

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 September
San Salvador, El Salvador

Average rainfall days in September - San Salvador, El Salvador
  • Average rainfall days in September: 26.3 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 September /
Average sunshine in September
San Salvador, El Salvador

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

The month with the longest days is June (Average daylight: 12h and 55min).
The month with the shortest days is December (Average daylight: 11h and 20min).

  • Average sunshine in September: 9.3h

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

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Average sunshine days in September
San Salvador, El Salvador

Average sunshine days in September - San Salvador, El Salvador
  • Average sunshine days in September: 3.2 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 September
San Salvador, El Salvador

Average UV index in September - San Salvador, El Salvador
  • Average UV index in September: 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).

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Average cloud cover in September
San Salvador, El Salvador

Average cloud cover in September - San Salvador, El Salvador
  • Average cloud cover in September: 38

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).

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Average visibility in September
San Salvador, El Salvador

Average visibility in September - San Salvador, El Salvador
  • Average visibility in September: 8km

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).

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