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

September

Weather in September

September sees a slight dip in temperature in San Salvador, mirrored by the decline in daylight and sunshine duration. Rainfall continues unabated, contributing to high levels of humidity and cloud cover. Despite this, the UV index remains consistently high. Distinctively, the month experiences the most amount of cloud cover in the year, a whopping 38%. Moisture levels also peak, with a recorded rainfall of 142mm (5.59") over approximately 26.3 rainy days.

Temperature

With the advent of September, San Salvador experiences an average high-temperature of a warm 29.8°C (85.6°F), mirroring a close resemblance to the previous month. An average nighttime temperature of 21.5°C (70.7°F) is witnessed throughout September.

Heat index

In September, the heat index is calculated to be a torrid 38°C (100.4°F). Incorporate extra safety measures to avoid heat exhaustion and heat cramps. Continuous activity could provoke heatstroke.
Realize that the values for the heat index are set for shaded places and light winds. Direct sunlight might lead to a heat index increase by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'apparent temperature', unifies temperature and humidity readings to offer a comprehensive feel of warmth. Metabolic differences, pregnancy status, and the level of physical activity are additional factors influencing an individual's weather perception. When exposed to direct sunlight, it's possible for the heat index to increase by as much as 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical to babies and toddlers. Kids are usually in more danger than grown-ups as they tend to sweat less. Plus, their bigger skin surface in relation to their small frames and increased heat generation due to their activity level make them more susceptible.
The natural method the human body uses to remove excess heat is by perspiring and letting sweat evaporate. An upsurge in relative humidity affects normal body cooling mechanisms by slowing evaporation, hence reducing the rate at which the body cools and intensifying the perception of heat. With body temperatures on the rise, inefficient heat shedding can lead to dehydration and its associated complications.

Humidity

The months with the highest humidity are September and October, with an average relative humidity of 82%.

Rainfall

In San Salvador, in September, it is raining for 26.3 days, with typically 142mm (5.59") of accumulated precipitation. Throughout the year, there are 187 rainfall days, and 1106mm (43.54") of precipitation is accumulated.

Daylight

The average length of the day in September is 12h and 12min.
On the first day of the month, sunrise is at 05:45 and sunset at 18:07. On the last day of September, sunrise is at 05:46 and sunset at 17:46 CST.

Sunshine

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 of 6 to 7 symbolizes a high health hazard from exposure to the Sun's UV rays for the ordinary person.
Note: The daily high UV index of 6 in September translates into this advice:
Resist extreme sun exposure. Guarding against solar damage is essential. Avoid exposure to the Sun and try to stay in the shade between 10 a.m. and 4 p.m., when UV radiation is most potent, but be aware that parasols or canopies may not offer full protection. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure.

Frequently asked questions

Is it hot during September?
San Salvador in September has an average high-temperature of 29.8°C (85.6°F) and an average low-temperature of 21.5°C (70.7°F). The average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which combines air temperature and relative humidity, in September is calculated to be 38°C (100.4°F).
What is the most humid month?
September and October, with an average relative humidity of 82%, are most humid months.
What is the average humidity in September?
The average relative humidity in September is 82%.
How much does it rain in September?
In San Salvador, in September, during 26.3 rainfall days, 142mm (5.59") of precipitation is typically accumulated.
What is the average length of the day in September?
In San Salvador, the average day length in September is 12h and 12min.
What time 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 18:07. On the last day of the month, sunrise is at 05:46 and sunset at 17:46 CST.
How many hours of sunshine does San Salvador have in September?
The average sunshine duration in September is 9.3h.
What is the month with the lowest UV index?
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 reading in September?
The average daily maximum UV index in September is 6. A UV Index of 6 to 7 symbolizes a high hazard to health from unsafe exposure to Sun's UV rays.
Average high temperature
Average low temperature
Average wind speed
Average max. wind speed
Average wind speed gusts
Average humidity
Average rainfall
Average rainfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility
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).

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).

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).

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%).

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).

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).

Average daylight in September /
Average sunshine in September
San Salvador, El Salvador
  • Average daylight in September: 12h and 1min

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 September: 9h and 2min

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 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).

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).

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).

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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