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La Fortuna Weather in September
September in La Fortuna brings high temperatures, with highs of 27°C (81°F) and nights dropping to 22°C (72°F). The rainy season is in full swing this month, so frequent downpours are part of the picture.
Rainfall in La Fortuna in September
As part of the rainy season, La Fortuna sees around 20 days of rain in September, with an average of 331 mm (13 in). With high rainfall totals spread across the month, individual showers can be very heavy. Waterproof gear is strongly recommended.
Temperature in La Fortuna in September
La Fortuna in September gets highs of 27°C (81°F) during the day and drops to 22°C (72°F) at night. Overall, the month follows a fairly predictable daily temperature pattern. With lows of 22°C (72°F), the nights are warm and generally comfortable.If you're looking for dry conditions and comfortable temperatures, September may not be the ideal month to visit La Fortuna. Our weather planner can help you explore destinations with more pleasant weather conditions.
La Fortuna Temperature in September
Min Temperature
22°C (72°F)
Max Temperature
27°C (81°F)
Chance of Rain
67%
Precipitation
331 mm (13 in)
Rainy days
20 days
La Fortuna Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in La Fortuna - and find the best time to visit.
Daily Historical Temperatures
44-year average (1976-2025)
Based on our historical records, temperatures in La Fortuna typically stay consistent throughout September, with daily highs averaging around 27°C (81°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 records for La Fortuna in September
Browse day-by-day weather records for La Fortuna spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
La Fortuna historical weather extremes in September
According to our 29 years of weather records for La Fortuna, the following extremes were recorded between 1996 and 2025.
- The hottest September day on record in La Fortuna reached 33°C (91°F) (September 5, 1997).
- On September 29, 2010, La Fortuna saw its coldest September day with temperatures maxing out at 21°C (70°F).
- The coldest night in September in La Fortuna was on September 29, 2010, with a minimum of 13°C (55°F).
- The wettest September day on record brought 167 mm (6.6 in) of precipitation to La Fortuna (September 27, 2019).
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
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 La Fortuna 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 La Fortuna 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
La Fortuna 3-Day Forecast
More climate data for La Fortuna
See the full La Fortuna climate overview or explore weather in Costa Rica.
Popular in September
Where to go in September - average daytime high across popular destinations.
Tamarindo
30°C (86°F) Cahuita29°C (84°F) Santa Teresa29°C (84°F) Herradura28°C (82°F) Puerto Viejo de Talamanca29°C (84°F) Fortuna29°C (84°F) Jacó28°C (82°F) San José24°C (75°F) Bucket list
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