Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average sea temperature in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
With the advent of September, Arrentela's high-temperatures adjust to a still warm 25.6°C (78.1°F), closely aligning with the preceding month. The low-temperature average for Arrentela during September stands at a refreshing 17.5°C (63.5°F).Humidity
In September, the average relative humidity in Arrentela is 69%.Rainfall
In Arrentela, in September, during 3.1 rainfall days, 2mm (0.08") of precipitation is typically accumulated. Throughout the year, there are 54.2 rainfall days, and 61mm (2.4") of precipitation is accumulated.Sea temperature
The month with the warmest seawater is September, with an average sea temperature of 19.9°C (67.8°F).Note: Swimming in water of 19.9°C (67.8°F) is not enjoyable for the majority of individuals. Breathing control becomes increasingly challenging as the temperature dips from 21°C (69.8°F) to 15°C (59°F).
Daylight
The average length of the day in September is 12h and 26min.On the first day of September, sunrise is at 07:06 and sunset at 20:06. On the last day of the month, sunrise is at 07:31 and sunset at 19:20 WEST.
Sunshine
In Arrentela, Portugal, the average sunshine in September is 9.4h.UV index
The months with the highest UV index in Arrentela are May through September, with an average maximum UV index of 6. A UV Index of 6 to 7 symbolizes a high health risk from exposure to the Sun's UV rays for average individuals.Note: In September, an average UV index of 6 transforms into the following instructions:
Follow precautions and abide by sun safety rules. Deterrence of sunburn is imperative. Limit direct sun exposure and seek shade between 10 a.m. and 4 p.m., the time of the most intense UV radiation, noting that shade structures may not provide total sun protection. A wide-brimmed hat is a shield, deflecting up to 50% of harmful UV radiation from eyes.
Frequently asked questions
What is the usual temperature for Arrentela in September?
What is the average humidity in September in Arrentela?
How many days does it rain in September in Arrentela?
What month is the sea warmest in Arrentela?
How cold is the water in September in Arrentela?
What is the average length of the day in September in Arrentela?
When are sunrise and sunset in September in Arrentela?
How many hours of sunshine does Arrentela have in September?
When is the highest UV index in Arrentela?
What is the UV index intensity in September in Arrentela?
Average temperature in September
Arrentela, Portugal
- Average high temperature in September: 25.6°C
The warmest month (with the highest average high temperature) is August (27.1°C).
The month with the lowest average high temperature is January (14.9°C).
- Average low temperature in September: 17.5°C
The month with the highest average low temperature is July (17.9°C).
The coldest month (with the lowest average low temperature) is February (9.8°C).
Average pressure in September
Arrentela, 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).
Average wind speed in September
Arrentela, Portugal
- Average wind speed in September: 13.1km/h
The windiest month (with the highest average wind speed) is February (16.5km/h).
The calmest month (with the lowest average wind speed) is September (13.1km/h).
Average humidity in September
Arrentela, Portugal
- Average humidity in September: 69%
The month with the highest relative humidity is January (76%).
The month with the lowest relative humidity is August (68%).
Average rainfall in September
Arrentela, Portugal
- Average rainfall in September: 2mm
The wettest month (with the highest rainfall) is November (15mm).
The driest months (with the least rainfall) are June, July and August (1mm).
Average rainfall days in September
Arrentela, Portugal
- Average rainfall days in September: 3.1 days
The month with the highest number of rainy days is November (9.3 days).
The month with the least rainy days is August (0.8 days).
Average sea temperature in September
Arrentela, Portugal
- Average sea temperature in September: 19.9°C
The best month for swimming (with the highest average sea temperature) is September (19.9°C).
The coldest month (with the lowest average sea temperature) is March (15.1°C).
Average daylight in September /
Average sunshine in September
Arrentela, Portugal
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 30min).
- Average sunshine in September: 9h and 2min
The month with the most sunshine is July (Average sunshine: 11h and 24min).
The month with the least sunshine is January (Average sunshine: 5h and 24min).
Average sunshine days in September
Arrentela, Portugal
- Average sunshine days in September: 26.3 days
The month with the most sunshine days is July (29.7 days).
The month with the least sunshine days is November (17.7 days).
Average UV index in September
Arrentela, Portugal
- Average UV index in September: 6
The months with the highest UV index are May, 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).
Average cloud cover in September
Arrentela, Portugal
- Average cloud cover in September: 16
The month with the most cloud cover is January (Cloud cover 40).
The month with the least cloud cover is August (Cloud cover 13).
Average visibility in September
Arrentela, 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).
Arrentela, Portugal
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