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
September's onset records a minor alteration in the average high-temperature to a still moderately hot 25°C (77°F) from August's 27.4°C (81.3°F). Throughout September, Guia witnesses a consistent average low-temperature of 19.2°C (66.6°F).Humidity
The average relative humidity in September is 68%.Rainfall
In Guia, in September, during 2.5 rainfall days, 2mm (0.08") of precipitation is typically accumulated. In Guia, during the entire year, the rain falls for 62.4 days and collects up to 78mm (3.07") of precipitation.Sea temperature
August and September, with an average sea temperature of 21°C (69.8°F), are months with the warmest seawater in Guia.Note: For most individuals, swimming in 21°C (69.8°F) is not a pleasurable activity. Breathing becomes progressively more difficult as water temperature declines below 21°C (69.8°F).
Daylight
In Guia, the average length of the day in September is 12h and 25min.On the first day of the month, sunrise is at 07:04 and sunset at 20:01. On the last day of September, in Guia, Portugal, sunrise is at 07:28 and sunset at 19:17 WEST.
Sunshine
In September, the average sunshine in Guia is 9.6h.UV index
June through September, 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 threat to health from unprotected exposure to Sun's UV rays for average individuals.Note: A typical high UV index of 6 in September suggests the following recommendations:
Persist with precautions and heed sun safety advice. Prevention of sunburn is compulsory. UV radiation from the Sun is most intense between 10 a.m. and 4 p.m. Try to avoid direct sunlight during this period. Loose clothes with a tight weave are optimal for safeguarding yourself against the Sun's rays.
Frequently asked questions
What is the temperature in September in Guia?
What is the average humidity in September in Guia?
How many days does it rain in September in Guia?
What are the months with the warmest sea water in Guia?
What is the sea water temperature in September in Guia?
How many hours of daylight does Guia have in September?
When are sunrise and sunset in September in Guia?
How long on average sun shines in September in Guia?
When is the highest UV index in Guia?
What is the UV index reading in September in Guia?
Average temperature in September
Guia, Portugal
- Average high temperature in September: 25°C
The warmest month (with the highest average high temperature) is August (27.4°C).
The month with the lowest average high temperature is January (15°C).
- Average low temperature in September: 19.2°C
The month with the highest average low temperature is August (19.7°C).
The coldest month (with the lowest average low temperature) is February (10.6°C).
Average pressure in September
Guia, Portugal
- Average pressure in September: 1016.6mbar
The month with the highest atmospheric pressure is December (1022.5mbar).
The month with the lowest atmospheric pressure is April (1015.5mbar).
Average wind speed in September
Guia, Portugal
- Average wind speed in September: 12.5km/h
The windiest month (with the highest average wind speed) is February (18.1km/h).
The calmest month (with the lowest average wind speed) is September (12.5km/h).
Average humidity in September
Guia, Portugal
- Average humidity in September: 68%
The months with the highest relative humidity are January, March, April and December (75%).
The month with the lowest relative humidity is August (64%).
Average rainfall in September
Guia, Portugal
- Average rainfall in September: 2mm
The wettest month (with the highest rainfall) is November (14mm).
The driest month (with the least rainfall) is July (0mm).
Average rainfall days in September
Guia, Portugal
- Average rainfall days in September: 2.5 days
The month with the highest number of rainy days is November (9.2 days).
The month with the least rainy days is August (0.7 days).
Average sea temperature in September
Guia, Portugal
- Average sea temperature in September: 21°C
The best months for swimming (with the highest average sea temperature) are August and September (21°C).
The coldest month (with the lowest average sea temperature) is February (15°C).
Average daylight in September /
Average sunshine in September
Guia, 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 54min).
The month with the least sunshine is January (Average sunshine: 6h and 0min).
Average sunshine days in September
Guia, Portugal
- Average sunshine days in September: 26.3 days
The month with the most sunshine days is July (29.8 days).
The month with the least sunshine days is November (19.2 days).
Average UV index in September
Guia, 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).
Average cloud cover in September
Guia, Portugal
- Average cloud cover in September: 13
The month with the most cloud cover is January (Cloud cover 31).
The month with the least cloud cover is July (Cloud cover 5).
Average visibility in September
Guia, 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).
Guia, Portugal
Weather forecast for your location
2. Allow the app to use your location
