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
September
Weather in September
Temperature
Altura experiences a recorded average high-temperature of a still warm 25.4°C (77.7°F) in September, closely aligned with August's 28.3°C (82.9°F). The average nighttime temperature in Altura lowers to a refreshing 19.7°C (67.5°F) throughout September.Humidity
The average relative humidity in September in Altura is 66%.Rainfall
In September, the rain falls for 2.5 days. Throughout September, 3mm (0.12") of precipitation is accumulated. Throughout the year, in Altura, Portugal, there are 51.4 rainfall days, and 90mm (3.54") of precipitation is accumulated.Sea temperature
In Altura, the average seawater temperature in September is 21°C (69.8°F).Note: A majority do not enjoy swimming in water at 21°C (69.8°F). The difficulty in controlling breathing increases progressively as the temperature dips below 21°C (69.8°F).
Daylight
In Altura, the average length of the day in September is 12h and 25min.On the first day of September in Altura, sunrise is at 07:01 and sunset at 19:58. On the last day of the month, sunrise is at 07:24 and sunset at 19:14 WEST.
Sunshine
In Altura, the average sunshine in September is 9.7h.UV index
The months with the highest UV index are May through September, with an average maximum UV index of 6. A UV Index of 6 to 7 symbolizes a high health hazard from exposure to the Sun's UV radiation for average individuals.Note: In September, an average UV index of 6 transforms into the following instructions:
Guard oneself from overexposure. Defence against sun injury is vital. During the period from 10 a.m. to 4 p.m., UV radiation is highest. Try to avoid direct sunlight during these hours. In bright sunlight, prioritize sunglasses that grant protection from UVA and UVB radiation.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the temperature in September in Altura?
What is the average humidity in September in Altura?
How many days does it rain in September in Altura?
What is the sea temperature in September in Altura?
How many hours of daylight does Altura have in September?
When are sunrise and sunset in September in Altura?
How long on average sun shines in September in Altura?
When is the highest UV index in Altura?
What is the UV index reading in September in Altura?
Average temperature in September
Altura, Portugal
- Average high temperature in September: 25.4°C
The warmest month (with the highest average high temperature) is August (28.3°C).
The month with the lowest average high temperature is January (14.9°C).
- Average low temperature in September: 19.7°C
The month with the highest average low temperature is August (20.4°C).
The coldest month (with the lowest average low temperature) is February (10.3°C).
Average pressure in September
Altura, Portugal
- Average pressure in September: 1016.3mbar
The month with the highest atmospheric pressure is December (1022.5mbar).
The months with the lowest atmospheric pressure are April and August (1015.3mbar).
Average wind speed in September
Altura, Portugal
- Average wind speed in September: 12.2km/h
The windiest month (with the highest average wind speed) is February (18km/h).
The calmest month (with the lowest average wind speed) is September (12.2km/h).
Average humidity in September
Altura, Portugal
- Average humidity in September: 66%
The month with the highest relative humidity is January (74%).
The months with the lowest relative humidity are July and August (60%).
Average rainfall in September
Altura, Portugal
- Average rainfall in September: 3mm
The wettest months (with the highest rainfall) are April and November (15mm).
The driest months (with the least rainfall) are July and August (1mm).
Average rainfall days in September
Altura, Portugal
- Average rainfall days in September: 2.5 days
The month with the highest number of rainy days is April (8.4 days).
The month with the least rainy days is August (0.8 days).
Average sea temperature in September
Altura, Portugal
- Average sea temperature in September: 21°C
The best month for swimming (with the highest average sea temperature) is August (22°C).
The coldest months (with the lowest average sea temperature) are January, February and March (16°C).
Average daylight in September /
Average sunshine in September
Altura, 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: 12h and 0min).
The month with the least sunshine is January (Average sunshine: 6h and 12min).
Average sunshine days in September
Altura, Portugal
- Average sunshine days in September: 26.7 days
The month with the most sunshine days is July (29.8 days).
The month with the least sunshine days is April (20 days).
Average UV index in September
Altura, 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
Altura, Portugal
- Average cloud cover in September: 12
The months with the most cloud cover are January and April (Cloud cover 29).
The month with the least cloud cover is July (Cloud cover 4).
Average visibility in September
Altura, 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).
