Coco Weather in September
September in Coco brings high temperatures, with daytime highs of 30°C (86°F) and nights around 25°C (77°F). It's part of the rainy season, with 286 mm (11 in) of rainfall on average, so an umbrella or poncho is a good idea.
Rainfall in Coco in September
Coco is in the rainy season in September, with rain on around 23 days and an average of 286 mm (11 in). With rain on many days and solid totals, showers are frequent and often moderately heavy. Waterproof gear is a sensible idea.
Temperature in Coco in September
In September, Coco gets high temperatures, with highs of 30°C (86°F). Nights cool to around 25°C (77°F). The days can feel warmer than the evenings, so packing for both parts of the day is a good idea. Nights stay warm at around 25°C (77°F), so light bedding and good ventilation are worth thinking about.
Sunshine in Coco in September
The month brings about 158 hours of sunlight, offering a comfortable mix of sun and rainy moments.If you're looking for dry conditions and comfortable temperatures, September may not be the ideal month to visit Coco. 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 Coco's climate page.
Coco Temperature in September
Min Temperature
25°C (77°F)
Max Temperature
30°C (86°F)
Chance of Rain
77%
Precipitation
286 mm (11 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 Coco 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 Coco in September
Browse day-by-day weather records for Coco spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Coco historical weather extremes in September
Based on 26 years of weather observations (1999-2025), these are the most extreme conditions recorded in Coco.
- On September 12, 2025, temperatures climbed to 35°C (95°F), marking the warmest September day on record.
- Coco experienced its chilliest September day on September 22, 2005, reaching only 25°C (77°F).
- Coco registered its coldest September night on September 25, 2006, with temperatures dropping to 20°C (68°F).
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
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tolerable
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What to Wear in Coco in September
Warm but pleasant conditions in Coco in September. Focus on lightweight, maybe with natural fabrics, cotton blend shirts, comfortable shorts, and breathable footwear. A light cover-up for sun protection is smart too. It's going to pour! Pack a good poncho and prepare for very wet conditions. Bring sunglasses since you'll have some sunny periods throughout the monthWhat To Do in Coco 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 Coco's climate page.
Temperature Rainfall Sunshine Humidity
See the full Coco climate overview or explore weather in Costa Rica.
