September weather forecast and climate
São Francisco, Portugal

Weather in September

September, the first month of the autumn, in São Francisco, is still a warm month, with temperature in the range of an average high of 26.5°C (79.7°F) and an average low of 16.9°C (62.4°F).

Temperature

In September, the average high-temperature is practically the same as in August - a still moderately hot 26.5°C (79.7°F). In São Francisco, in September, the average low-temperature is 16.9°C (62.4°F).

Humidity

In September, the average relative humidity in São Francisco is 67%.

Rainfall

In São Francisco, during 3.6 rainfall days, 7mm (0.28") of precipitation is typically accumulated. In São Francisco, during the entire year, the rain falls for 78.2 days and collects up to 171mm (6.73") of precipitation.

Daylight

The average length of the day in September is 12.4h.

Sunshine

In São Francisco, Portugal, the average sunshine is 9.4h.

UV index

Months with the highest UV index in São Francisco, Portugal, are June through September, with an average maximum UV index of 6. A UV Index reading of 6 to 7 represents a high threat to health from unprotected exposure to the Sun's UV rays for the ordinary person.
Note: The daily maximum UV index of 6 in September interpret into the following advice:
Take precautions against overexposure. Protection against sun damage is needed. 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. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
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FAQ

What is the temperature in September in São Francisco?

The average high-temperature, in September, is 26.5°C (79.7°F), while the average low-temperature is 16.9°C (62.4°F).

What is the average humidity in September in São Francisco?

In São Francisco, the average relative humidity in September is 67%.

How many days does it rain in September in São Francisco?

In São Francisco, in September, it is raining for 3.6 days, with typically 7mm (0.28") of accumulated precipitation.

What is the average length of the day in September in São Francisco?

In September, the average length of the day in São Francisco, Portugal, is 12.4h.

How long on average sun shines in September in São Francisco?

In São Francisco, Portugal, the average sunshine in September is 9.4h.

What is the month with the highest UV index in São Francisco?

June through September, with an average maximum UV index of 6, are months with the highest UV index in São Francisco, Portugal.

How high is the UV index in September in São Francisco?

In São Francisco, Portugal, the average daily maximum UV index in September is 6. A UV Index value of 6 to 7 symbolizes a high health threat from the exposure to the Sun's UV rays.

Average temperature in September
São Francisco, Portugal

Average temperature in September - São Francisco, Portugal
  • Average high temperature in September: 26.5°C

The warmest month (with the highest average high temperature) is August (28.5°C).
The month with the lowest average high temperature is January (14.8°C).

  • Average low temperature in September: 16.9°C

Months with the highest average low temperature are July and August (17.3°C).
The coldest month (with the lowest average low temperature) is February (9°C).

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Average pressure in September
São Francisco, Portugal

Average pressure in September - São Francisco, 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 (1015.6mbar).

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Average wind speed in September
São Francisco, Portugal

Average wind speed in September - São Francisco, Portugal
  • Average wind speed in September: 11.8km/h

The windiest month (with the highest average wind speed) is February (15km/h).
The calmest month (with the lowest average wind speed) is September (11.8km/h).

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Average humidity in September
São Francisco, Portugal

Average humidity in September - São Francisco, Portugal
  • Average humidity in September: 67%

The month with the highest relative humidity is January (77%).
The month with the lowest relative humidity is August (66%).

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Average rainfall in September
São Francisco, Portugal

Average rainfall in September - São Francisco, Portugal
  • Average rainfall in September: 7mm

The wettest month (with the highest rainfall) is November (34mm).
The driest months (with the least rainfall) are July and August (2mm).

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Average rainfall days in September
São Francisco, Portugal

Average rainfall days in September - São Francisco, Portugal
  • Average rainfall days in September: 3.6 days

The month with the highest number of rainy days is April (11 days).
The month with the least rainy days is August (1.6 days).

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Average daylight in September /
Average sunshine in September
São Francisco, Portugal

Average daylight in September / Average sunshine in September - São Francisco, Portugal
  • Average daylight in September: 12.4h

The month with the longest days is June (Average daylight: 14.8h).
The month with the shortest days is December (Average daylight: 9.5h).

  • Average sunshine in September: 9.4h

The month with the most sunshine is July (Average sunshine: 11.3h).
The month with the least sunshine is January (Average sunshine: 5.3h).

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Average sunshine days in September
São Francisco, Portugal

Average sunshine days in September - São Francisco, Portugal
  • Average sunshine days in September: 25.3 days

The month with the most sunshine days is August (28 days).
The month with the least sunshine days is April (17.2 days).

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Average UV index in September
São Francisco, Portugal

Average UV index in September - São Francisco, Portugal
  • Average UV index in September: 6

Months with the highest UV index are June, July, August and September (UV index 6).
The month with the lowest UV index is December (UV index 3).

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Average cloud cover in September
São Francisco, Portugal

Average cloud cover in September - São Francisco, Portugal
  • Average cloud cover in September: 17

The month with the most cloud cover is January (Cloud cover 41).
The month with the least cloud cover is August (Cloud cover 13).

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Average visibility in September
São Francisco, Portugal

Average visibility in September - São Francisco, 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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