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Turrialba Weather in September
Turrialba in September averages 24°C (75°F) during the day and 16°C (61°F) at night. September is part of the rainy season, so frequent rainfall is typical.
Rainfall in Turrialba in September
Turrialba is in the rainy season in September, with rain on around 24 days and an average of 362 mm (14 in). Showers during the rainy season tend to be heavy and can come down intensely. An umbrella is often not enough, so a poncho or waterproof jacket is a better choice.
Temperature in Turrialba in September
Daytime temperatures in Turrialba reach 24°C (75°F) in September, dropping to 16°C (61°F) at night. This kind of day-to-night contrast is typical for this time of year. Nights drop to around 16°C (61°F), which is noticeably cooler than the daytime. A light jacket for the evening is a sensible addition, and the cool nights tend to make sleeping comfortable.
Sunshine in Turrialba in September
The city usually sees around 149 hours of sunlight, indicating a moderately sunny period (despite it being part of rainy season).If you're looking for dry conditions and comfortable temperatures, September may not be the ideal month to visit Turrialba. Our weather planner can help you explore destinations with more pleasant weather conditions.
Turrialba Temperature in September
Min Temperature
16°C (61°F)
Max Temperature
24°C (75°F)
Chance of Rain
79%
Precipitation
362 mm (14 in)
Rainy days
24 days
Humidity
85% *
Sunshine
149 hours *
Percentage Sunshine
*
* Data from: San José, Costa Rica (43 KM, 27 Miles).
Turrialba Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Turrialba - and find the best time to visit.
Daily Historical Temperatures
44-year average (1976-2025)
Based on our historical records, temperatures in Turrialba typically stay consistent throughout September, with daily highs averaging around 24°C (75°F). Nights are pleasant, with lows around 19°C (66°F).
Average temperatures in September
Daily Historical Precipitation
44-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 Turrialba in September
Browse day-by-day weather records for Turrialba spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Turrialba historical weather extremes in September
Based on 30 years of weather observations in Turrialba between 1996 and 2026, these are the recorded extremes.
- Turrialba recorded its highest September temperature of 33°C (91°F) on September 7, 2009.
- Turrialba experienced its chilliest September day on September 27, 1999, reaching only 21°C (70°F).
- The lowest overnight temperature recorded in September was 13°C (55°F) (September 29, 2010).
- The wettest September day on record brought 163 mm (6.4 in) of precipitation to Turrialba (September 27, 2019).
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 Turrialba in September
For Turrialba in September, you'll want flexible clothing. It's wise to pack cotton shirts, comfortable shorts, and a pair of jeans for cooler evenings. A light sweater or jacket is useful for air-conditioned spaces (like buses) or unexpected cool moments. Also bring a poncho, it will rain a lot! Waterproof everything you can. Bring sunglasses since you'll have some sunny periods throughout the month
What To Do in Turrialba in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
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Swimming7/10 -
Camping6/10
Turrialba 3-Day Forecast
More climate data for Turrialba
Temperature Rainfall Sunshine Humidity
See the full Turrialba 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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