Middle of the wetter season · Weather & things to do
Manuel Antonio in September
Little changes in Manuel Antonio from August: highs stay near 82°F (28°C), lows near 78°F (25°C), and about 11.6 in (294 mm) of rain falls.
Our comfort score puts it mid-table at 40/100, 7th of 12.
- Avg high
- 82°F (28°C)
- Avg low
- 78°F (25°C)
- Rain
- 11.6 in (294 mm)
- Humidity
- 87%
- Cloud cover
- 85%
- Daylight
- ~12 h 03 min
- Comfort score
- 40/100 · Tough
What September feels like
Highs settle around 82°F (28°C), warm enough for short sleeves.
Even at night it stays warm, around 78°F (25°C).
Humidity averages 87%, so the air feels sticky and the heat feels stronger than the thermometer says.
It's a very wet month, with around 11.6 in (294 mm) of rain, so keep plans flexible and have indoor backups ready.
Skies are often grey, with average cloud cover around 85%.
Plan around September
September sits mid-table; the best months are January – March.
- Inside the wettest three-month stretch, August – October.
- Comfort holds steady from August (38 → 40/100).
- Our Costa Rica Pura Vida route recommends Dec – Apr, so September falls outside its suggested window.
What to pack for September
- Light, breathable clotheshighs average 82°F
- Quick-dry fabrics87% average humidity
- Rain jacket and waterproof shoesfrequent rain
- Comfortable walking shoesmost places below are best reached on foot or with short walks
What to do in Manuel Antonio in September
Wet days call for a roof: these picks favor sit-down and indoor stops, plus a few for drier spells.
El Avión
Bar in a cargo plane.
Why now A sit-down stop to wait out showers in a month with 11.6 in of rain.
Rainmaker Conservation Project
Rainforest reserve with bridges.
Manuel Antonio National Park
Small park of rainforest trails and beaches.
Planet Dolphin catamaran
Sunset catamaran tour.
Nearby in September
- Monteverde in September~78 mi · highs 71°F, 9.9 in rain · 7°C (12°F) cooler by day, drier
- La Fortuna in September~82 mi · highs 83°F, 9.2 in rain · similar daytime temperatures, drier
NASA POWER 2001–2025 monthly averages on a ~50 km grid, temperatures adjusted from the grid cell's ~264 m to Manuel Antonio's ~108 m elevation (standard lapse rate). Comfort scores weigh temperature, rain, humidity and cloud: see how we score each month. Check a forecast before you go.
Manuel Antonio in September: quick answers
Is September a good time to visit Manuel Antonio?
It's middling, scoring 40/100. The best months are January – March, at up to 84. Expect highs of 82°F (28°C) and 11.6 in (294 mm) of rain. Our Costa Rica Pura Vida route recommends Dec – Apr, so September is outside its suggested window.
How hot is Manuel Antonio in September?
Average highs are 82°F (28°C) and average lows 78°F (25°C), making it the 3rd-coldest month by daytime highs.
Does it rain a lot in Manuel Antonio in September?
Yes: about 11.6 in (294 mm) of rain falls across September on average, the 2nd-wettest month of the year. The annual total is about 90.1 in (2288 mm).
What should I pack for Manuel Antonio in September?
Bring light, breathable clothes (highs average 82°F), quick-dry fabrics (87% average humidity), rain jacket and waterproof shoes (frequent rain) and comfortable walking shoes (most places below are best reached on foot or with short walks).
More on Manuel Antonio
Planning Manuel Antonio in September?
Share this September plan with your group, poll everyone on dates and keep the packing list in one place.