Middle of the wetter season · Weather & things to do
La Fortuna in September
Little changes in La Fortuna from August: highs stay near 83°F (28°C), lows near 72°F (22°C), and about 9.2 in (233 mm) of rain falls.
With a comfort score of 40/100 (11th of 12), it's one of the toughest months, held back mainly by humidity.
- Avg high
- 83°F (28°C)
- Avg low
- 72°F (22°C)
- Rain
- 9.2 in (233 mm)
- Humidity
- 91%
- Cloud cover
- 83%
- Daylight
- ~12 h 03 min
- Comfort score
- 40/100 · Tough
What September feels like
Highs settle around 83°F (28°C), warm enough for short sleeves.
Even at night it stays warm, around 72°F (22°C).
With 91% average humidity, it feels muggy.
Expect regular rain: about 9.2 in (233 mm) falls in the month.
Expect plenty of overcast days, with cloud cover near 83%.
Plan around September
September is one of the lower-scoring months here; the best are January – March.
- Start of the wettest three-month stretch (September – November), which brings about 27.4 in (695 mm) in total.
- Comfort slips from 46/100 in August to 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 clothes83°F afternoons
- Quick-dry fabrics91% average humidity
- Rain jacket and waterproof shoes9.2 in of rain on average
- Comfortable walking shoesmost places below are best reached on foot or with short walks
What to do in La Fortuna in September
Wet days call for a roof: these picks favor sit-down and indoor stops, plus a few for drier spells.
Restaurante Don Rufino
Long-running grill in town for steak and local plates.
Why now A sit-down stop to wait out showers in a month with 9.2 in of rain.
Lava Lounge
Open-air bar and restaurant with cocktails.
Why now Easy to slot in when September's rain moves in.
Soda Viquez
Local soda serving casados and gallo pinto.
Why now Keeps part of the day dry on wetter September days.
Rainforest Chocolate Tour
Bean-to-bar chocolate tour with tastings.
Arenal 1968
Private reserve with lava-field trails and lake views.
Nearby in September
- Monteverde in September~16 mi · highs 71°F, 9.9 in rain · 7°C (12°F) cooler by day, wetter
- Manuel Antonio in September~82 mi · highs 82°F, 11.6 in rain · similar daytime temperatures, wetter
NASA POWER 2001–2025 monthly averages on a ~50 km grid, temperatures adjusted from the grid cell's ~506 m to La Fortuna's ~253 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.
La Fortuna in September: quick answers
Is September a good time to visit La Fortuna?
It's one of the tougher months here, scoring 40/100, held back mainly by humidity. The best months are January – March. Expect highs of 83°F (28°C) and 9.2 in (233 mm) of rain. Our Costa Rica Pura Vida route recommends Dec – Apr, so September is outside its suggested window.
How hot is La Fortuna in September?
Average highs are 83°F (28°C) and average lows 72°F (22°C), making it the 6th-coldest month by daytime highs.
Does it rain a lot in La Fortuna in September?
Yes: about 9.2 in (233 mm) of rain falls across September on average, the 2nd-wettest month of the year. The annual total is about 63.2 in (1605 mm).
What should I pack for La Fortuna in September?
Bring light, breathable clothes (83°F afternoons), quick-dry fabrics (91% average humidity), rain jacket and waterproof shoes (9.2 in of rain on average) and comfortable walking shoes (most places below are best reached on foot or with short walks).
More on La Fortuna
Planning La Fortuna in September?
Plan it together in TripsCircle: one itinerary, one shared packing list and costs split as you go.