Weather in San Salvador in September 2025
- September is usually the wettest month of the year in San Salvador;
Average weather
Average temperature in San Salvador in September
The temperature in September is +86°F on average, with a range between a maximum of +91°F during the day and a minimum of +70°F at night.
The average maximum temperature goes down 25% by the end of the month, compared with the beginning of the month, from +90°F to +84°F.
Is San Salvador warm or cold in September?
San Salvador is typically warm in September.
Maximum temperatures go down compared to the previous month from +84°F to +82°F. The minimum temperature also goes up from +70°F to +70°F.
It’s generally warm, but pack a long-sleeve shirt for evenings.
September is one of the coolest months in San Salvador, here is the comparison with other months:
Climate in San Salvador in September
| August | September | October | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +84°F | +82°F | +82°F | ||||
| Min. temperature | ||||||
| +64°F | +63°F | +57°F | ||||
| Max. temperature | ||||||
| +91°F | +91°F | +88°F | ||||
| Rainfall | ||||||
| 268 mm | 336 mm | 260 mm | ||||
| Wind | ||||||
| 1 m/s | 1 m/s | 1 m/s | ||||
| Humidity | ||||||
| 83% | 85% | 83% | ||||
| Air pressure | ||||||
| 1012 HPa | 1012 HPa | 1012 HPa | ||||
| Sunny days | ||||||
| 0 | 0 | 1 | ||||
| Cloudy days | ||||||
| 1 | 0 | 2 | ||||
| Rainy days | ||||||
| 17 | 17 | 18 | ||||
| Snowy days | ||||||
| 0 | 0 | 0 | ||||
September weather is still as ok as in August. It’s getting colder in September. From +84°F in the day, the average maximum temperature lowers to +82°F. Prepare for more rain. Average rainfall goes from 268 mm to 336 mm. Humidity rises from 83% to 85%. The average wind speed doesn’t change much during September, staying around 1 m/s. The amount of sunny days stay about the same, averaging 0 sunny days during the month.
October brings much the same weather, it remains ok.
Wind
The average wind speed is 1 m/s getting up to 1 m/s which is a light breeze; barely moving the tree leaves.
The average wind speed in San Salvador is gradually increasing during September, going from 1 m/s to 1 m/s over the course of the month.
Rain
How was the weather last September in San Salvador?
Climate Change Over the Years
The climate in San Salvador in September has not changed that much over the last 43 years.
The average temperature was the lowest in 1984 (+82°F) and the highest in 2016 (+86°F). The driest year was 2001 with only 1181 mm of rainfall, and the wettest year was 2020 with 3143 mm.
FAQ
Is September a good time to visit San Salvador?
Can you sunbathe in San Salvador in September?
Is San Salvador rainy in September?
Is it sunny in San Salvador in September?
Monthly weather in San Salvador
Source of the data
For this page, we’ve looked at the typical weather in San Salvador, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.