August weather forecast and climate
São João da Ribeira, Portugal

Weather in August

August, the last month of the summer, in São João da Ribeira, is a tropical month, with average temperature varying between 15.6°C (60.1°F) and 31°C (87.8°F).

Temperature

With an average high-temperature of 31°C (87.8°F) and an average low-temperature of 15.6°C (60.1°F), August is the warmest month.

Heat index

In August, the average heat index is calculated to a sweltering 35.4°C (95.7°F). Take special precautions - heat exhaustion and heat cramps are expected. Heatstroke may occur with lengthy activity.
Note that heat index values are valued for light wind and location in the shade. With the exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature', 'real feel', 'apparent temperature', or 'feels like', is calculated by taking the relative humidity value for a specific location and factoring it into the air temperature reading. This effect is subjective, depending on the activity and individual's heat perception influenced by various reasons (wind, clothing, pregnancy). Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it is vital to remain hydrated, particularly during prolonged physical activities.
To prevent overheating and help regulate its internal temperature, the human body sweat and rely on the evaporation to cool down. When the relative humidity is high, the evaporation rate is reduced. The warmth is removed from the body at a lower rate, causing the body to retain more heat than it would in dry air. If the body can not disperse the excessive heat and body temperature reaches conditions of hyperthermia, above 37.5°C (99.5°F) to 38.3°C (100.9°F), thermal conditions are potentially life-threatening.

Humidity

The least humid month in São João da Ribeira, Portugal, is August, with an average relative humidity of 62%.

Rainfall

July and August are months with the least rain when the rain falls for 2.4 days and typically aggregates up to 3mm (0.12") of rain.

Daylight

In São João da Ribeira, the average length of the day is 13.7h.

Sunshine

The average sunshine in São João da Ribeira is 11h.

UV index

June through August, with an average maximum UV index of 6, are months with the highest UV index. A UV Index reading of 6 to 7 represents a high health vulnerability from unprotected exposure to the Sun's UV rays for the average person.
Note: In August, the average maximum UV index of 6 translate into the following recommendations:
Take precautions and utilize sun safety practices. Protection against the skin and eye damage is required. 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. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.
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FAQ

What is the warmest month in São João da Ribeira?

The warmest month in São João da Ribeira, Portugal, is August, with an average high-temperature of 31°C (87.8°F) and an average low-temperature of 15.6°C (60.1°F).

What is the temperature in August in São João da Ribeira?

The average high-temperature, in August, is 31°C (87.8°F), while the average low-temperature is 15.6°C (60.1°F). The average heat index (a.k.a. 'real feel', 'feels like'), that calculates temperature value influenced by the moisture in the air, in August is calculated to 35.4°C (95.7°F).

What is the least humid month in São João da Ribeira?

The least humid month is August, with an average relative humidity of 62%.

What is the average humidity in August in São João da Ribeira?

In São João da Ribeira, Portugal, the average relative humidity in August is 62%.

How many days does it rain in August in São João da Ribeira?

In August, the rain falls for 2.4 days. Throughout August, 3mm (0.12") of precipitation is accumulated.

What is the driest month in São João da Ribeira?

Months with the least rainfall in São João da Ribeira are July and August Rain falls for 2.4 days and accumulates 3mm (0.12") of rain.

How many hours of daylight does São João da Ribeira have in August?

In São João da Ribeira, Portugal, the average length of the day in August is 13.7h.

How long on average sun shines in August in São João da Ribeira?

In São João da Ribeira, the average sunshine in August is 11h.

When is the highest UV index in São João da Ribeira?

Months with the highest UV index in São João da Ribeira are June through August, with an average maximum UV index of 6.

How high is the UV index in August in São João da Ribeira?

In São João da Ribeira, Portugal, the average daily maximum UV index in August is 6. A UV Index value of 6 to 7 symbolizes a high health vulnerability from the exposure to the Sun's UV rays.

Average temperature in August
São João da Ribeira, Portugal

Average temperature in August - São João da Ribeira, Portugal
  • Average high temperature in August: 31°C

The warmest month (with the highest average high temperature) is August (31°C).
The month with the lowest average high temperature is January (14°C).

  • Average low temperature in August: 15.6°C

The month with the highest average low temperature is July (15.8°C).
The coldest months (with the lowest average low temperature) are January and February (6.8°C).

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Average pressure in August
São João da Ribeira, Portugal

Average pressure in August - São João da Ribeira, Portugal
  • Average pressure in August: 1016.3mbar

The month with the highest atmospheric pressure is December (1022.6mbar).
The month with the lowest atmospheric pressure is April (1015.5mbar).

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Average wind speed in August
São João da Ribeira, Portugal

Average wind speed in August - São João da Ribeira, Portugal
  • Average wind speed in August: 12.4km/h

The windiest month (with the highest average wind speed) is July (13.2km/h).
The calmest months (with the lowest average wind speed) are September and October (10.6km/h).

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Average humidity in August
São João da Ribeira, Portugal

Average humidity in August - São João da Ribeira, Portugal
  • Average humidity in August: 62%

The month with the highest relative humidity is January (81%).
The month with the lowest relative humidity is August (62%).

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Average rainfall in August
São João da Ribeira, Portugal

Average rainfall in August - São João da Ribeira, Portugal
  • Average rainfall in August: 3mm

The wettest month (with the highest rainfall) is November (53mm).
The driest months (with the least rainfall) are July and August (3mm).

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Average rainfall days in August
São João da Ribeira, Portugal

Average rainfall days in August - São João da Ribeira, Portugal
  • Average rainfall days in August: 2.4 days

The month with the highest number of rainy days is November (13.9 days).
The month with the least rainy days is August (2.4 days).

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Average daylight in August /
Average sunshine in August
São João da Ribeira, Portugal

Average daylight in August / Average sunshine in August - São João da Ribeira, Portugal
  • Average daylight in August: 13.7h

The month with the longest days is June (Average daylight: 14.9h).
The month with the shortest days is December (Average daylight: 9.5h).

  • Average sunshine in August: 11h

The month with the most sunshine is July (Average sunshine: 11.2h).
The month with the least sunshine is January (Average sunshine: 5.2h).

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Average sunshine days in August
São João da Ribeira, Portugal

Average sunshine days in August - São João da Ribeira, Portugal
  • Average sunshine days in August: 26.9 days

The month with the most sunshine days is July (27.3 days).
Months with the least sunshine days are April and November (14.6 days).

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Average UV index in August
São João da Ribeira, Portugal

Average UV index in August - São João da Ribeira, Portugal
  • Average UV index in August: 6

Months with the highest UV index are June, July and August (UV index 6).
Months with the lowest UV index are January, February, November and December (UV index 3).

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Average cloud cover in August
São João da Ribeira, Portugal

Average cloud cover in August - São João da Ribeira, Portugal
  • Average cloud cover in August: 17

The month with the most cloud cover is January (Cloud cover 42).
The month with the least cloud cover is August (Cloud cover 17).

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Average visibility in August
São João da Ribeira, Portugal

Average visibility in August - São João da Ribeira, Portugal
  • Average visibility in August: 9km

The month with the highest visibility is June (10km).
Months with the lowest visibility are January, February, March, April, May, July, August, September, October, November and December (9km).

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