Santa Teresa Weather in September
September in Santa Teresa brings high temperatures, with highs of 29°C (84°F) and nights dropping to 25°C (77°F). The rainy season is in full swing this month, so frequent downpours are part of the picture.
Rainfall in Santa Teresa in September
Santa Teresa is in the rainy season in September, with rain on around 22 days and an average of 375 mm (15 in). Rainy season showers here are typically intense, often clearing quickly but coming down hard while they last.
Temperature in Santa Teresa in September
Temperatures in Santa Teresa in September top out at 29°C (84°F) and drop to 25°C (77°F) overnight. Conditions stay fairly consistent through the month, making it easier to plan what to wear. Nights stay warm at around 25°C (77°F), so light bedding and good ventilation are worth thinking about.
Sunshine in Santa Teresa in September
The city usually sees around 159 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 Santa Teresa. 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 Santa Teresa's climate page.
Santa Teresa Temperature in September
Min Temperature
25°C (77°F)
Max Temperature
29°C (84°F)
Chance of Rain
75%
Precipitation
375 mm (15 in)
Rainy days
22 days
Sunshine
159 hours *
Percentage Sunshine
*
Historical weather for Santa Teresa in September
Browse day-by-day weather records for Santa Teresa spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Santa Teresa historical weather extremes in September
Based on 19 years of weather observations (2006-2025), these are the most extreme conditions recorded in Santa Teresa.
- On September 11, 2025, temperatures climbed to 30°C (86°F), marking the warmest September day on record.
- The lowest daytime temperature in September was 25°C (77°F), recorded on September 6, 2010.
- The coldest night in September in Santa Teresa was on September 21, 2006, with a minimum of 23°C (73°F).
- The wettest day in September Santa Teresa was on September 27, 2025 with 105 mm (4.1 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
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tolerable
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What to Wear in Santa Teresa in September
Warm but pleasant conditions in Santa Teresa 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 Santa Teresa 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 Santa Teresa's climate page.
See the full Santa Teresa climate overview or explore weather in Costa Rica.
