September weather forecast and climate
Vale de Santiago, Portugal

Weather in September

The first month of the autumn, September, is still a warm month in Vale de Santiago, Portugal, with temperature in the range of an average low of 18.8°C (65.8°F) and an average high of 23.5°C (74.3°F).

Temperature

In September, the average high-temperature is relatively the same as in August - a still warm 23.5°C (74.3°F). In Vale de Santiago, the average low-temperature is 18.8°C (65.8°F).

Humidity

The average relative humidity in September is 73%.

Rainfall

In Vale de Santiago, during 4.2 rainfall days, 14mm (0.55") of precipitation is typically accumulated. In Vale de Santiago, during the entire year, the rain falls for 94.7 days and collects up to 328mm (12.91") of precipitation.

Daylight

In September, the average length of the day in Vale de Santiago, Portugal, is 12.4h.

Sunshine

In September, the average sunshine is 9.4h.

UV index

Months with the highest UV index are June through September, with an average maximum UV index of 6. A UV Index reading of 6 to 7 represents a high health hazard from the exposure to the Sun's UV radiation for average individuals.
Note: In September, the average maximum UV index of 6 translate into the following recommendations:
Take precautions against overexposure. Fair-skinned people may get burned in less than 20 minutes. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. 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 temperature in September in Vale de Santiago?

In September, in Vale de Santiago, the average high-temperature is 23.5°C (74.3°F), and the average low-temperature is 18.8°C (65.8°F).

What is the average humidity in September in Vale de Santiago?

In September, the average relative humidity in Vale de Santiago, Portugal, is 73%.

How many days does it rain in September in Vale de Santiago?

In September, in Vale de Santiago, Portugal, the rain falls for 4.2 days. Throughout September, 14mm (0.55") of precipitation is accumulated.

How many hours of daylight does Vale de Santiago have in September?

In Vale de Santiago, the average length of the day in September is 12.4h.

How long on average sun shines in September in Vale de Santiago?

In Vale de Santiago, the average sunshine in September is 9.4h.

When is the highest UV index in Vale de Santiago?

Months with the highest UV index are June through September, with an average maximum UV index of 6.

What is the UV index intensity in September in Vale de Santiago?

In September, the average daily maximum UV index in Vale de Santiago is 6. A UV Index estimate of 6 to 7 represents a high hazard to health from unsafe exposure to the Sun's UV rays.

Average temperature in September
Vale de Santiago, Portugal

Average temperature in September - Vale de Santiago, Portugal
  • Average high temperature in September: 23.5°C

The warmest month (with the highest average high temperature) is August (24.2°C).
The month with the lowest average high temperature is February (14.8°C).

  • Average low temperature in September: 18.8°C

Months with the highest average low temperature are August and September (18.8°C).
The coldest month (with the lowest average low temperature) is February (10.8°C).

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Average pressure in September
Vale de Santiago, Portugal

Average pressure in September - Vale de Santiago, Portugal
  • Average pressure in September: 1016.9mbar

The month with the highest atmospheric pressure is December (1022.6mbar).
The month with the lowest atmospheric pressure is April (1015.7mbar).

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Average wind speed in September
Vale de Santiago, Portugal

Average wind speed in September - Vale de Santiago, Portugal
  • Average wind speed in September: 15km/h

The windiest month (with the highest average wind speed) is February (19.4km/h).
The calmest month (with the lowest average wind speed) is September (15km/h).

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Average humidity in September
Vale de Santiago, Portugal

Average humidity in September - Vale de Santiago, Portugal
  • Average humidity in September: 73%

The month with the highest relative humidity is April (76%).
The month with the lowest relative humidity is October (72%).

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Average rainfall in September
Vale de Santiago, Portugal

Average rainfall in September - Vale de Santiago, Portugal
  • Average rainfall in September: 14mm

The wettest month (with the highest rainfall) is November (56mm).
The driest month (with the least rainfall) is July (1mm).

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Average rainfall days in September
Vale de Santiago, Portugal

Average rainfall days in September - Vale de Santiago, Portugal
  • Average rainfall days in September: 4.2 days

The month with the highest number of rainy days is November (13.4 days).
The month with the least rainy days is August (1.1 days).

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Average daylight in September /
Average sunshine in September
Vale de Santiago, Portugal

Average daylight in September / Average sunshine in September - Vale de Santiago, Portugal
  • Average daylight in September: 12.4h

The month with the longest days is June (Average daylight: 14.7h).
The month with the shortest days is December (Average daylight: 9.6h).

  • Average sunshine in September: 9.4h

The month with the most sunshine is July (Average sunshine: 11.5h).
The month with the least sunshine is January (Average sunshine: 5.7h).

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Average sunshine days in September
Vale de Santiago, Portugal

Average sunshine days in September - Vale de Santiago, Portugal
  • Average sunshine days in September: 25.1 days

The month with the most sunshine days is August (29.4 days).
The month with the least sunshine days is April (15.3 days).

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Average UV index in September
Vale de Santiago, Portugal

Average UV index in September - Vale de Santiago, Portugal
  • Average UV index in September: 6

Months with the highest UV index are June, July, August and September (UV index 6).
Months with the lowest UV index are January, February, March, April, November and December (UV index 4).

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Average cloud cover in September
Vale de Santiago, Portugal

Average cloud cover in September - Vale de Santiago, Portugal
  • Average cloud cover in September: 16

The month with the most cloud cover is January (Cloud cover 37).
The month with the least cloud cover is August (Cloud cover 10).

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Average visibility in September
Vale de Santiago, Portugal

Average visibility in September - Vale de Santiago, Portugal
  • Average visibility in September: 10km

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

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