San Salvador Weather in September
San Salvador in September sees very high daytime temperatures of 31°C (88°F) and nighttime lows of 22°C (72°F). With the highest rainfall of the year it is wise to pack an umbrella and expect frequent showers.
Rainfall in San Salvador in September
San Salvador is in the rainy season in September, with rain on around 29 days and an average of 322 mm (13 in). Rainfall this month is frequent and tends to be fairly heavy when it does fall. Packing waterproofs is a good idea.
Temperature in San Salvador in September
San Salvador in September gets highs of 31°C (88°F) during the day and drops to 22°C (72°F) at night. For most visitors, the main thing to prepare for is the heat during the day. At 22°C (72°F) overnight, nights are warm enough to sit outside comfortably in light clothing.
Sunshine in San Salvador in September
The city usually sees around 181 hours of sunlight, indicating a moderately sunny period (despite it being part of rainy season).
Wind Speed in San Salvador in September
Average wind conditions reach 1 m/s (2 knots) in September. This creates generally peaceful weather with subtle air movement. Remember this is an average: some days are windless while others have noticeable or very gentle breezes.September in San Salvador has its charm. However, if you're seeking pleasant, dry and sunny weather, our weather planner can help you explore other destinations in the world.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit El Salvador, check out our San Salvador's climate page.
San Salvador Temperature in September
Min Temperature
22°C (72°F)
Max Temperature
31°C (88°F)
Chance of Rain
96%
Precipitation
322 mm (13 in)
Rainy days
29 days
Humidity
86%
Windspeed
1 m/s (2 knots)
Sunshine
181 hours
Percentage Sunshine
Daily Historical Temperatures
35-year average (1981-2025)
Based on our historical records, temperatures in San Salvador typically stay consistent throughout September, with daily highs averaging around 31°C (88°F). Nights are warm, with lows around 21°C (70°F).
Average temperatures in September
Daily Historical Precipitation
35-year average (1981-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in September
Historical weather for San Salvador in September
Browse day-by-day weather records for San Salvador spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
San Salvador historical weather extremes in September
Based on 20 years of weather observations in San Salvador between 2005 and 2025, these are the recorded extremes.
- On September 14, 2023, temperatures climbed to 34°C (93°F), marking the warmest September day on record.
- The lowest daytime temperature in September was 23°C (73°F), recorded on September 26, 2010.
- The coldest night in September in San Salvador was on September 10, 2011, with a minimum of 16°C (61°F).
- The wettest day in September San Salvador was on September 15, 2016 with 155 mm (6.1 in) of precipitation.
Best Places in El Salvador in September
Find out more about the weather in El Salvador and which places have the best travel conditions in this month. See all of El Salvador in September →
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What to Wear in San Salvador in September
Warm weather calls for comfortable, breathable clothing in September. Cotton t-shirts, shorts, light dresses, and sandals are perfect. You might still want a light layer for evenings or air-conditioned places (for example buses). Also bring a poncho, it will rain a lot! Waterproof everything you can. Sunglasses could come in handy during the sunnier parts of your trip.What To Do in San Salvador in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit El Salvador, check out our San Salvador's climate page.
Temperature Rainfall Sunshine Humidity Wind Speed
See the full San Salvador climate overview or explore weather in El Salvador.
