September weather forecast
Portimão, Portugal

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Weather in September

Come September, the slightly lowering mercury readings of 24.5°C (76.1°F) denote a subtle nod towards autumn. Despite the gentle drop in temperature, Portimão's weather remains vibrant and pleasant, reminiscent of summer warmth. The city begins its descent into the latter half of the year. Notably, rainfall starts to increase from the summer low of 1mm (0.04") to 3mm (0.12"), an early indicator of the subsequent autumnal months.

Temperature

September in Portimão experiences an average high-temperature of a still warm 24.5°C (76.1°F), barely different from August's 26.4°C (79.5°F). An average low-temperature of 19.3°C (66.7°F) is recorded during the nights in September in Portimão.

Humidity

The average relative humidity in September in Portimão is 71%.

Rainfall

In September, in Portimão, the rain falls for 3.1 days. Throughout September, 3mm (0.12") of precipitation is accumulated. Throughout the year, in Portimão, there are 73.8 rainfall days, and 116mm (4.57") of precipitation is accumulated.

Sea temperature

The month with the warmest seawater is September, with an average sea temperature of 21.2°C (70.2°F).
Note: Most people find swimming in 21.2°C (70.2°F) unenjoyable. As the water temperature falls from 21°C (69.8°F) to 15°C (59°F), controlling one's breathing becomes harder.

Daylight

In September, the average length of the day in Portimão, Portugal, is 12h and 25min.
On the first day of September, sunrise is at 07:05 and sunset at 20:02. On the last day of the month, sunrise is at 07:29 and sunset at 19:18 WEST.

Sunshine

The average sunshine in September in Portimão is 9.6h.

UV index

June through September, with an average maximum UV index of 6, are months with the highest UV index in Portimão. A UV Index value of 6 to 7 symbolizes a high health risk from unprotected exposure to Sun's UV rays for the ordinary person.
Note: The UV index of 6 during September translates into the following guidance:
Guard against overexposure. Protection from sun-induced harm is essential. Make an effort to avoid direct sun exposure between 10 a.m. and 4 p.m., the peak period for UV radiation, and note that objects like parasols or canopies might not offer full sun protection. For holistic sun protection encompassing the eyes, ears, face, and neck, a wide-brim hat is key. Warning! Sand and water reflections boost the intensity of UV exposure.
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Frequently asked questions

What are the temperatures in Portimão in September?

In Portimão, 24.5°C (76.1°F) is the average high-temperature and 19.3°C (66.7°F) is the average low-temperature during September.

What is the average humidity in September in Portimão?

In September, the average relative humidity in Portimão, Portugal, is 71%.

How many days does it rain in September in Portimão?

In September, in Portimão, the rain falls for 3.1 days. Throughout September, 3mm (0.12") of precipitation is accumulated.

When is the sea warmest in Portimão?

The month with the warmest seawater in Portimão, Portugal, is September, with an average sea temperature of 21.2°C (70.2°F).

What is the sea water temperature in September in Portimão?

In Portimão, the average seawater temperature in September is 21.2°C (70.2°F). Swimming in 21.2°C (70.2°F) is not enjoyable for the majority. Controlling breathing becomes progressively more difficult as surface water temperature decreases below 21°C (69.8°F).

How many hours of daylight does Portimão have in September?

In September, the average day length in Portimão is 12h and 25min.

When are sunrise and sunset in September in Portimão?

In September, on the first day of the month, sunrise is at 07:05 and sunset at 20:02. On the last day of the month, in Portimão, sunrise is at 07:29 and sunset at 19:18 WEST.

How many hours of sunshine does Portimão have in September?

In September, the average sunshine duration in Portimão is 9.6h.

What are the months with the highest UV index in Portimão?

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

What is the UV index intensity in September in Portimão?

In September, the average daily maximum UV index in Portimão is 6. A UV Index estimate of 6 to 7 represents a high health vulnerability from unprotected exposure to UV radiation.

Average temperature in September
Portimão, Portugal

Average temperature in September - Portimão, Portugal
  • Average high temperature in September: 24.5°C

The warmest month (with the highest average high temperature) is August (26.4°C).
The month with the lowest average high temperature is January (15.2°C).

  • Average low temperature in September: 19.3°C

The month with the highest average low temperature is August (19.4°C).
The coldest month (with the lowest average low temperature) is February (11°C).

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Average pressure in September
Portimão, Portugal

Average pressure in September - Portimão, Portugal
  • Average pressure in September: 1016.7mbar

The month with the highest atmospheric pressure is December (1022.5mbar).
The month with the lowest atmospheric pressure is April (1015.6mbar).

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Average wind speed in September
Portimão, Portugal

Average wind speed in September - Portimão, Portugal
  • Average wind speed in September: 13.3km/h

The windiest month (with the highest average wind speed) is February (18.7km/h).
The calmest month (with the lowest average wind speed) is September (13.3km/h).

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Average humidity in September
Portimão, Portugal

Average humidity in September - Portimão, Portugal
  • Average humidity in September: 71%

The month with the highest relative humidity is April (76%).
The month with the lowest relative humidity is August (68%).

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Average rainfall in September
Portimão, Portugal

Average rainfall in September - Portimão, Portugal
  • Average rainfall in September: 3mm

The wettest month (with the highest rainfall) is November (20mm).
The driest months (with the least rainfall) are July and August (1mm).

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Average rainfall days in September
Portimão, Portugal

Average rainfall days in September - Portimão, Portugal
  • Average rainfall days in September: 3.1 days

The month with the highest number of rainy days is March (10.5 days).
The month with the least rainy days is August (1 days).

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Average sea temperature in September
Portimão, Portugal

Average sea temperature in September - Portimão, Portugal
  • Average sea temperature in September: 21.2°C

The best month for swimming (with the highest average sea temperature) is September (21.2°C).
The coldest month (with the lowest average sea temperature) is March (16°C).

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Average daylight in September /
Average sunshine in September
Portimão, Portugal

Average daylight in September / Average sunshine in September - Portimão, Portugal
  • Average daylight in September: 12h and 2min

The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 42min).

  • Average sunshine in September: 9h and 4min

The month with the most sunshine is July (Average sunshine: 11h and 48min).
The month with the least sunshine is January (Average sunshine: 6h and 0min).

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Average sunshine days in September
Portimão, Portugal

Average sunshine days in September - Portimão, Portugal
  • Average sunshine days in September: 25.5 days

The month with the most sunshine days is July (29.5 days).
The month with the least sunshine days is November (17.4 days).

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Average UV index in September
Portimão, Portugal

Average UV index in September - Portimão, Portugal
  • Average UV index in September: 6

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

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Average cloud cover in September
Portimão, Portugal

Average cloud cover in September - Portimão, Portugal
  • Average cloud cover in September: 14

The month with the most cloud cover is January (Cloud cover 33).
The months with the least cloud cover are July and August (Cloud cover 7).

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Average visibility in September
Portimão, Portugal

Average visibility in September - Portimão, Portugal
  • Average visibility in September: 10km

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

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Portimão, Portugal

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