Playa Avellana Weather in September
With daytime temperatures of 30°C (86°F) and nighttime lows of 25°C (77°F), September in Playa Avellana brings very high temperatures during the day. Do keep in mind that September is part of the rainy season, with frequent and often heavy rainfall.
Rainfall in Playa Avellana in September
As part of the rainy season, Playa Avellana sees around 23 days of rain in September, with an average of 344 mm (14 in). Rainfall this month is frequent and tends to be fairly heavy when it does fall. Packing waterproofs is a good idea.
Temperature in Playa Avellana in September
September in Playa Avellana sees highs of 30°C (86°F) and lows of 25°C (77°F) overnight. If you're spending a lot of time outdoors, it helps to plan around the warmer part of the day. With overnight lows of 25°C (77°F), evenings and nights remain warm. Light clothing and an open window or fan can help you sleep comfortably.
Sunshine in Playa Avellana in September
The area experiences a moderate amount of sunshine, with approximately 158 hours of sunlight expected. Even though this month is part of the rainy season, you could still see the sun every now and then.If you prefer dry days with pleasant temperatures, September may not be the ideal month to visit Playa Avellana. Our weather planner can help you explore destinations with more pleasant weather conditions.
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 Playa Avellana's climate page.
Playa Avellana Temperature in September
Min Temperature
25°C (77°F)
Max Temperature
30°C (86°F)
Chance of Rain
77%
Precipitation
344 mm (14 in)
Rainy days
23 days
Humidity
86% *
Sunshine
158 hours *
Percentage Sunshine
*
Daily Historical Temperatures
41-year average (1977-2025)
Based on our historical records, temperatures in Playa Avellana typically stay consistent throughout September, with daily highs averaging around 30°C (86°F). Nights are warm, with lows around 24°C (75°F).
Average temperatures in September
Daily Historical Precipitation
41-year average (1977-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in September
Historical weather for Playa Avellana in September
Browse day-by-day weather records for Playa Avellana spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Playa Avellana historical weather extremes in September
The extremes listed below come from historical weather data collected in Playa Avellana from 1999 through 2025.
- The hottest September day on record in Playa Avellana reached 35°C (95°F) (September 23, 2023).
- On September 26, 2010, Playa Avellana saw its coldest September day with temperatures maxing out at 25°C (77°F).
- The lowest overnight temperature recorded in September was 20°C (68°F) (September 25, 2006).
- The heaviest September precipitation occurred on September 7, 2021, when 208 mm (8.2 in) of precipitation fell.
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 →
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What to Wear in Playa Avellana 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! It won't hurt to bring your sunglasses along, as you'll see some sunny periods.What To Do in Playa Avellana 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 Playa Avellana's climate page.
Temperature Rainfall Sunshine Humidity
See the full Playa Avellana climate overview or explore weather in Costa Rica.
