El Castillo de La Fortuna Weather in September
El Castillo de La Fortuna in September averages 29°C (84°F) during the day and 21°C (70°F) at night. September is part of the rainy season, so frequent rainfall is typical.
Rainfall in El Castillo de La Fortuna in September
El Castillo de La Fortuna is in the rainy season in September, with rain on around 24 days and an average of 320 mm (13 in). Rainy season showers tend to be fairly substantial. A good rain jacket or umbrella is worth having with you most days.
Temperature in El Castillo de La Fortuna in September
September in El Castillo de La Fortuna sees highs of 29°C (84°F) and lows of 21°C (70°F) overnight. Overall, the month follows a fairly predictable daily temperature pattern. Nights remain mild at 21°C (70°F), making evenings a pleasant time to be outdoors.
Sunshine in El Castillo de La Fortuna in September
The area enjoys a balanced 159 hours of sunlight, ensuring it's neither too rainy nor too sunny.Our weather planner can help you find worldwide destinations with pleasant weather during this period. January, February and March typically offer the best weather for El Castillo de La Fortuna.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Costa Rica, check out our El Castillo de La Fortuna's climate page.
El Castillo de La Fortuna Temperature in September
Min Temperature
21°C (70°F)
Max Temperature
29°C (84°F)
Chance of Rain
79%
Precipitation
320 mm (13 in)
Rainy days
24 days
Sunshine
159 hours *
Percentage Sunshine
*
Daily Historical Temperatures
44-year average (1976-2025)
Based on our historical records, temperatures in El Castillo de La Fortuna typically stay consistent throughout September, with daily highs averaging around 29°C (84°F). Nights are pleasant, with lows around 19°C (66°F).
Average temperatures in September
Daily Historical Precipitation
44-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in September
Historical weather for El Castillo de La Fortuna in September
Browse day-by-day weather records for El Castillo de La Fortuna spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
El Castillo de La Fortuna historical weather extremes in September
Based on weather observations in El Castillo de La Fortuna between 1996 and 2025, these are the recorded extremes during September.
- El Castillo de La Fortuna recorded its highest September temperature of 33°C (91°F) on September 5, 1997.
- The coldest September day was on September 29, 2010, with a maximum of 21°C (70°F).
- The lowest overnight temperature recorded in September was 11°C (52°F) (September 30, 2012).
- Peak precipitation in September occurred on September 27, 2019, when 171 mm (6.7 in) of precipitation was measured.
Best Places in Costa Rica in September
Find out more about the weather in Costa Rica and which places have the best travel conditions in this month. See all of Costa Rica in September →
perfect weather
pleasant
tolerable
unpleasant
poor
What to Wear in El Castillo de La Fortuna 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 El Castillo de La Fortuna 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 Costa Rica, check out our El Castillo de La Fortuna's climate page.
See the full El Castillo de La Fortuna climate overview or explore weather in Costa Rica.
