San José
Costa Rica
Long-term weather forecast
Long-term weather forecast

August weather forecast and climate
San José, Costa Rica

An aerial skyscape of San José, Costa Rica in the evening sun
An aerial skyscape of San José, Costa Rica in the evening sun
August, the last month of the summer, in San José, is also a moderately hot month, with average temperature fluctuating between 27°C (80.6°F) and 18.8°C (65.8°F).

Temperature

In San José, the average high-temperature is relatively the same as in July - a still moderately hot 27°C (80.6°F). The average low-temperature, in August, is 18.8°C (65.8°F).

Rainfall

In San José, during August, the rain falls for 14 days and regularly aggregates up to 276.9mm (10.9") of precipitation. Throughout the year, in San José, there are 107 rainfall days, and 1971mm (77.6") of precipitation is accumulated.

Daylight

In August, the average length of the day is 12.4h.

Sunshine

In San José, the average sunshine is 5.1h.

UV index

February through October, with an average maximum UV index of 12, are months with the highest UV index. A UV Index value of 11, and more, symbolizes an ultimate health vulnerability from unprotected exposure to the Sun's UV rays for ordinary individuals.
Note: In August, the average maximum UV index of 12 translate into the following recommendations:
Practice all essential precautions. Protection against sun damage is crucial. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.

What is the temperature in August in San José?

In August, in San José, the average high-temperature is 27°C (80.6°F), and the average low-temperature is 18.8°C (65.8°F).

How many days does it rain in August in San José?

In August, in San José, Costa Rica, the rain falls for 14 days. Throughout August, 276.9mm (10.9") of precipitation is accumulated.

How many hours of daylight does San José have in August?

The average length of the day in August in San José, Costa Rica, is 12.4h.

How long on average sun shines in August in San José?

In San José, the average sunshine in August is 5.1h.

What is the month with the highest UV index in San José?

Months with the highest UV index in San José are February through October, with an average maximum UV index of 12.

What is the UV index reading in August in San José?

The average daily maximum UV index in August in San José, Costa Rica, is 12. A UV Index value of 11, and more, symbolizes an extreme health threat from the exposure to the Sun's UV radiation.
Average temperature in August - San José, Costa Rica
  • Average high temperature in August: 27°C

The warmest month (with the highest average high temperature) is April (28.4°C).
The month with the lowest average high temperature is December (25.9°C).

  • Average low temperature in August: 18.8°C

Months with the highest average low temperature are May and July (19°C).
The coldest month (with the lowest average low temperature) is January (17.8°C).

Average rainfall in August - San José, Costa Rica
  • Average rainfall in August: 276.9mm

The wettest month (with the highest rainfall) is September (355.1mm).
The driest month (with the lowest rainfall) is January (6.3mm).

Average rainfall days in August - San José, Costa Rica
  • Average rainfall days in August: 14 days

The month with the highest number of rainy days is September (18 days).
Months with the lowest number of rainy days are January and February (1 days).

Average daylight in August / Average sunshine in August - San José, Costa Rica
  • Average daylight in August: 12.4h

The month with the longest days is June (Average daylight: 12.7h).
Months with shortest days are January and December (Average daylight: 11.6h).

  • Average sunshine in August: 5.1h

The month with most sunshine is February (Average sunshine: 9.5h).
The month with least sunshine is June (Average sunshine: 4.8h).

Average UV index in August - San José, Costa Rica
  • Average UV index in August: 12

Months with the highest UV index are February, March, April, May, June, July, August, September and October (UV index 12).
The month with the lowest UV index is December (UV index 10).