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Compare Costa Rica weather in February, from dry and sunny Tamarindo to wetter Puerto Viejo, plus Jacó, Arenal and San José.
Nuevo Arenal Weather in September
September in Nuevo Arenal brings high temperatures, with highs of 29°C (84°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 Nuevo Arenal in September
As part of the rainy season, Nuevo Arenal sees around 24 days of rain in September, with an average of 303 mm (12 in). With rain on many days and solid totals, showers are frequent and often moderately heavy. Waterproof gear is a sensible idea.
Temperature in Nuevo Arenal in September
September in Nuevo Arenal sees highs of 29°C (84°F) and lows of 22°C (72°F) overnight. The days can feel warmer than the evenings, so packing for both parts of the day is a good idea. With lows of 22°C (72°F), the nights are warm and generally comfortable.If you prefer dry days with pleasant temperatures, September may not be the ideal month to visit Nuevo Arenal. Our weather planner can help you explore destinations with more pleasant weather conditions.
Nuevo Arenal Temperature in September
Min Temperature
22°C (72°F)
Max Temperature
29°C (84°F)
Chance of Rain
78%
Precipitation
303 mm (12 in)
Rainy days
24 days
Humidity
88% *
* Data from: Los Chiles, Costa Rica (57 KM, 35 Miles).
Nuevo Arenal Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Nuevo Arenal - and find the best time to visit.
Daily Historical Temperatures
43-year average (1976-2025)
Based on our historical records, temperatures in Nuevo Arenal typically stay consistent throughout September, with daily highs averaging around 29°C (84°F). Nights are warm, with lows around 23°C (73°F).
Average temperatures in September
Daily Historical Precipitation
43-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 Nuevo Arenal in September
Browse day-by-day weather records for Nuevo Arenal spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Nuevo Arenal historical weather extremes in September
Based on weather observations in Nuevo Arenal between 1996 and 2025, these are the recorded extremes during September.
- The hottest September day on record in Nuevo Arenal reached 35°C (95°F) (September 23, 2023).
- On September 4, 2008, Nuevo Arenal saw its coldest September day with temperatures maxing out at 24°C (75°F).
- The lowest overnight temperature recorded in September was 20°C (68°F) (September 20, 2014).
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 Nuevo Arenal 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.
What To Do in Nuevo Arenal 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
Nuevo Arenal 3-Day Forecast
More climate data for Nuevo Arenal
See the full Nuevo Arenal 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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