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San Marcos Weather in September
Thinking of visiting San Marcos in September? Expect very high temperatures reaching 32°C (90°F) during the day, dropping to 23°C (73°F) at night. Heavy showers are common during the rainy season.
Rainfall in San Marcos in September
San Marcos is in the rainy season in September, with rain on around 24 days and an average of 284 mm (11 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 Marcos in September
Daytime highs in San Marcos in September reach 32°C (90°F), with nights around 23°C (73°F). Sunshine and humidity can make it feel even warmer than the raw temperature suggests. Nights stay warm at around 23°C (73°F), so light bedding and good ventilation are worth thinking about.
Sunshine in San Marcos in September
The city usually sees around 212 hours of sunlight, indicating many sunny days despite it being the rainy season.If you're looking for dry conditions and comfortable temperatures, September may not be the ideal month to visit San Marcos. Our weather planner can help you explore destinations with more pleasant weather conditions.
San Marcos Temperature in September
Min Temperature
23°C (73°F)
Max Temperature
32°C (90°F)
Chance of Rain
81%
Precipitation
284 mm (11 in)
Rainy days
24 days
Humidity
82% *
Sunshine
212 hours *
Percentage Sunshine
*
* Data from: Managua, Nicaragua (27 KM, 17 Miles).
San Marcos Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in San Marcos - and find the best time to visit.
Daily Historical Temperatures
33-year average (1983-2025)
Based on our historical records, temperatures in San Marcos 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 Marcos in September
Browse day-by-day weather records for San Marcos spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
San Marcos historical weather extremes in September
Based on 30 years of weather observations in San Marcos between 1996 and 2026, these are the recorded extremes.
- San Marcos recorded its highest September temperature of 37°C (99°F) on September 4, 2026.
- San Marcos experienced its chilliest September day on September 27, 1999, reaching only 26°C (79°F).
- Nighttime temperatures dropped to 22°C (72°F) on September 22, 2025, marking the coldest September night on record.
Best Places in Nicaragua in September
Find out more about the weather in Nicaragua and which places have the best travel conditions in this month. See all of Nicaragua in September →
perfect weather
pleasant
tolerable
unpleasant
poor
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 Marcos 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. Don't forget sun protection, sunglasses, sunscreen, and a hat. These are all good ideas with this much sunshine.
What To Do in San Marcos in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
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Swimming8/10 -
Cycling7/10 -
Walking7/10 -
Camping6/10 -
Outdoor sports7/10
San Marcos 3-Day Forecast
More climate data for San Marcos
Temperature Rainfall Sunshine Humidity
See the full San Marcos climate overview or explore weather in Nicaragua.
Popular in September
Where to go in September - average daytime high across popular destinations.
Managua
33°C (91°F) León32°C (90°F) Popoyo30°C (86°F) Estelí30°C (86°F) Granada31°C (88°F) Big Corn Island29°C (84°F) Moyogalpa29°C (84°F) San Juan del Sur29°C (84°F) Bucket list
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