San Miguel Weather in September
September in San Miguel brings very high temperatures, with daytime highs of 32°C (90°F) and nights around 23°C (73°F). It's also the wettest month of the year, so an umbrella is a must.
Rainfall in San Miguel in September
As part of the rainy season, San Miguel sees around 28 days of rain in September, with an average of 347 mm (14 in). Rainy season showers tend to be fairly substantial. A good rain jacket or umbrella is worth having with you most days.
Temperature in San Miguel in September
Temperatures in San Miguel in September top out at 32°C (90°F) and drop to 23°C (73°F) overnight. If you're spending a lot of time outdoors, it helps to plan around the warmer part of the day. Nights are mild at around 23°C (73°F), which is comfortable for most people.If you're looking for dry conditions and comfortable temperatures, September may not be the ideal month to visit San Miguel. Our weather planner can help you explore destinations with more pleasant weather conditions.
San Miguel Temperature in September
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San Miguel Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in San Miguel - and find the best time to visit.
Daily Historical Temperatures
40-year average (1983-2025)
Based on our historical records, temperatures in San Miguel typically stay consistent throughout September, with daily highs averaging around 32°C (90°F). Nights are warm, with lows around 24°C (75°F).
Average temperatures in September
Historical weather records for San Miguel in September
Browse day-by-day weather records for San Miguel spanning 46 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
San Miguel historical weather extremes in September
According to our 24 years of weather records for San Miguel, the following extremes were recorded between 2001 and 2025.
- The hottest September day on record in San Miguel reached 37°C (99°F) (September 3, 2009).
- On September 27, 2010, San Miguel saw its coldest September day with temperatures maxing out at 26°C (79°F).
- The coldest night in September in San Miguel was on September 18, 2025, with a minimum of 20°C (68°F).
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 →
Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).
What to Wear in San Miguel in September
Warm temperatures in September make for comfortable sightseeing weather. Pack breathable fabrics like cotton shirts, knee-length shorts or skirts, and comfortable walking shoes. A thin long sleeve for indoor spaces is handy. Heavy rain is guaranteed, please bring a good poncho and waterproof everything!
What To Do in San Miguel in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
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Cycling7/10 -
Walking7/10 -
Camping6/10 -
Outdoor sports7/10
San Miguel 3-Day Forecast
See the full San Miguel climate overview or explore weather in El Salvador.
Popular in September
Where to go in September - average daytime high across popular destinations.
San Miguel
32°C (90°F) San Salvador31°C (88°F) El Cuco31°C (88°F) Santa Ana31°C (88°F) El Zonte29°C (84°F) Concepción de Ataco29°C (84°F) La Libertad29°C (84°F) El Sunzal29°C (84°F) 
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