September weather forecast
San Andres, El Salvador

The first month of the autumn, September, is also a hot month in San Andres, El Salvador, with temperature in the range of an average low of 20.5°C (68.9°F) and an average high of 30.9°C (87.6°F).

Temperature

San Andres records an average high-temperature of a still tropical 30.9°C (87.6°F) in September, closely mirroring the climate of the previous month. Throughout the nights in September, San Andres experiences an average low-temperature of 20.5°C (68.9°F).

Heat index

The heat index value during September is appraised at a blistering 41°C (105.8°F). Exercise special caution, heat exhaustion and heat cramps are probable. Prolonged activity may induce heatstroke.
The standards for the heat index are set for locations in shade and under light breezes. Heat index values might soar by up to 15 Fahrenheit (8 Celsius) degrees with exposure to direct sunshine.
Note: The heat index, also known as 'real feel' or 'feels like', stands as a testimony to how temperature and humidity combine to impact our sense of warmth. One's weather perception can be influenced by a range of factors including metabolic differences, being pregnant, and their level of physical activity. Awareness of direct sun exposure is crucial as it has the potential to heighten the weather's effects, pushing up the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly important for children. Kids generally face higher risks than adults as they sweat less. Along with their large skin surface compared to their small bodies and higher heat production due to their activities, their vulnerability is increased.
The evaporation of sweat is a natural cooling mechanism of the human body, facilitated by perspiration. When the relative humidity is high, the evaporation rate is reduced. The warmth is removed from the body at a lower rate, causing the body to retain more heat than it would in dry air. If the body retains more heat than it can expel, the increasing temperature can lead to heat-related conditions.

Humidity

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

Rainfall

In San Andres, in September, it is raining for 27.5 days, with typically 134mm (5.28") of accumulated precipitation. In San Andres, during the entire year, the rain falls for 192.2 days and collects up to 1062mm (41.81") of precipitation.

Daylight

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

Sunshine

In September, the average sunshine is 8.8h.

UV index

The months with the lowest UV index in San Andres are January, June 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 radiation for the average person.
Note: In September, a daily maximum UV index of 6 leads to the following instructions:
Undertake protective measures and comply with sun safety rules. Shielding against skin and eye damage is essential. Be aware that the sun's UV radiation is strongest between 10 a.m. and 4 p.m. and try to reduce direct sun exposure during this period as much as possible. 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.