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Compare Costa Rica weather in February, from dry and sunny Tamarindo to wetter Puerto Viejo, plus Jacó, Arenal and San José.
Heredia Weather in September
September in Heredia brings high temperatures around 25°C (77°F) during the day, dropping to 17°C (63°F) at night, and as part of the rainy season, heavy rainfall is common.
Rainfall in Heredia in September
Heredia is in the rainy season in September, with rain on around 24 days and an average of 426 mm (17 in). Rainy season showers here are typically intense, often clearing quickly but coming down hard while they last.
Temperature in Heredia in September
Daytime highs in Heredia in September reach 25°C (77°F), with nights around 17°C (63°F). The days can feel warmer than the evenings, so packing for both parts of the day is a good idea. At 17°C (63°F) overnight, it can feel quite a bit cooler after dark. Worth packing something warmer for evenings, but the cooler temperatures are ideal for sleeping.
Sunshine in Heredia in September
The month brings about 149 hours of sunlight, offering a comfortable mix of sun and rainy moments.Our weather planner can help you find worldwide destinations with pleasant weather during this period. January, February, March and April typically offer the best weather for Heredia.
Heredia Temperature in September
Min Temperature
17°C (63°F)
Max Temperature
25°C (77°F)
Chance of Rain
81%
Precipitation
426 mm (17 in)
Rainy days
24 days
Humidity
85% *
Sunshine
149 hours *
Percentage Sunshine
*
* Data from: San José, Costa Rica (8 KM, 5 Miles).
Heredia Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Heredia - and find the best time to visit.
Daily Historical Temperatures
44-year average (1976-2025)
Based on our historical records, temperatures in Heredia typically stay consistent throughout September, with daily highs averaging around 25°C (77°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 Heredia in September
Browse day-by-day weather records for Heredia spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Heredia historical weather extremes in September
Based on 29 years of weather observations (1996-2025), these are the most extreme conditions recorded in Heredia.
- On September 7, 2009, temperatures climbed to 33°C (91°F), marking the warmest September day on record.
- The lowest daytime temperature in September was 21°C (70°F), recorded on September 29, 2010.
- Nighttime temperatures dropped to 14°C (57°F) on September 29, 2010, marking the coldest September night on record.
- The wettest day in September Heredia was on September 27, 2019 with 164 mm (6.5 in) of precipitation.
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 Heredia in September
Comfortable temperatures call for an easy wardrobe in September. Pack summer basics like t-shirts and shorts, but include a light jacket for cooler moments. A pair of comfortable walking shoes is essential. It's going to pour! Pack a good poncho and prepare for very wet conditions. Sunglasses could come in handy during the sunnier parts of your trip.
What To Do in Heredia in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
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Swimming7/10 -
Camping6/10
Heredia 3-Day Forecast
More climate data for Heredia
Temperature Rainfall Sunshine Humidity
See the full Heredia 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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