San José Weather in August
San José in August sees high temperatures, with highs around 24°C (75°F) and overnight lows of 17°C (63°F). With the rainy season in full effect, expect around 414 mm (16 in) of rainfall and regular showers throughout the month.
Rainfall in San José in August
As part of the rainy season, San José sees around 24 days of rain in August, with an average of 414 mm (16 in). With high rainfall totals spread across the month, individual showers can be very heavy. Waterproof gear is strongly recommended.
Temperature in San José in August
August in San José sees highs of 24°C (75°F) and lows of 17°C (63°F) overnight. Conditions stay fairly consistent through the month, making it easier to plan what to wear. With overnight lows of 17°C (63°F), evenings can feel noticeably cooler than the daytime. An extra layer is a good idea, though the cool air makes for a good night's sleep.
Sunshine in San José in August
The area experiences a moderate amount of sunshine, with approximately 160 hours of sunlight expected. Even though this month is part of the rainy season, you could still see the sun every now and then.August in San José can still be great, but if you prefer pleasant temperatures along with dry and sunny conditions, our weather planner can help you explore other options in the world.
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 San José's climate page.
San José Temperature in August
Min Temperature
17°C (63°F)
Max Temperature
24°C (75°F)
Chance of Rain
79%
Precipitation
414 mm (16 in)
Rainy days
24 days
Humidity
83%
Sunshine
160 hours
Percentage Sunshine
Daily Historical Temperatures
43-year average (1976-2025)
Based on our historical records, temperatures in San José typically stay consistent throughout August, with daily highs averaging around 24°C (75°F). Nights are pleasant, with lows around 19°C (66°F).
Average temperatures in August
Daily Historical Precipitation
43-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in August
Historical weather for San José in August
Browse day-by-day weather records for San José spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
San José historical weather extremes in August
The extremes listed below come from historical weather data collected in San José from 1996 through 2025.
- The warmest day in August was on August 13, 2003, with a maximum of 32°C (90°F).
- The lowest daytime temperature in August was 21°C (70°F), recorded on August 26, 2020.
- The lowest overnight temperature recorded in August was 14°C (57°F) (August 20, 2012).
- The heaviest August precipitation occurred on August 18, 2009, when 273 mm (11 in) of precipitation fell.
Best Places in Costa Rica in August
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 August →
perfect weather
pleasant
tolerable
unpleasant
poor
What to Wear in San José in August
Pleasant temperatures in August mean you can pack light but flexibel pieces. Think cotton t-shirts, comfortable walking shorts, and one warmer layer for evenings. A light sweater or denim jacket works well. Heavy rain is guaranteed, please bring a good poncho and waterproof everything! Bring sunglasses since you'll have some sunny periods throughout the monthWhat To Do in San José in August
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 San José's climate page.
Temperature Rainfall Sunshine Humidity
See the full San José climate overview or explore weather in Costa Rica.
