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 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
Stepping into September, Alte records an average high-temperature of a still moderately hot 25.5°C (77.9°F), almost consistent with August. In the month of September, Alte's average low-temperature falls to a comfortable 18.8°C (65.8°F).Humidity
The average relative humidity in September in Alte is 67%.Rainfall
In Alte, during September, the rain falls for 2.8 days and regularly aggregates up to 3mm (0.12") of precipitation. In Alte, during the entire year, the rain falls for 45.8 days and collects up to 63mm (2.48") of precipitation.Daylight
In September, the average length of the day in Alte is 12h and 25min.On the first day of the month, sunrise is at 07:03 and sunset at 20:01. On the last day of September, in Alte, Portugal, sunrise is at 07:27 and sunset at 19:17 WEST.
Sunshine
In September, the average sunshine is 9.6h.UV index
May 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 health hazard from unsafe exposure to UV radiation for ordinary individuals.Note: A daily high UV index of 6 in September leads to these guidelines:
Deflect overexposure. Sun protection is a necessity. 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. 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.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in Alte in September?
What is the average humidity in September in Alte?
How many days does it rain in September in Alte?
What is the average length of the day in September in Alte?
What time are sunrise and sunset in September in Alte?
How many hours of sunshine does Alte have in September?
What are the months with the highest UV index in Alte?
What is the UV index intensity in September in Alte?
Average temperature in September
Alte, Portugal
- Average high temperature in September: 25.5°C
The warmest month (with the highest average high temperature) is August (28°C).
The month with the lowest average high temperature is January (14.9°C).
- Average low temperature in September: 18.8°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 (10.2°C).
Average pressure in September
Alte, 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
Alte, Portugal
- Average wind speed in September: 12.2km/h
The windiest months (with the highest average wind speed) are February and March (17.5km/h).
The calmest month (with the lowest average wind speed) is September (12.2km/h).
Average humidity in September
Alte, Portugal
- Average humidity in September: 67%
The month with the highest relative humidity is January (76%).
The month with the lowest relative humidity is August (62%).
Average rainfall in September
Alte, Portugal
- Average rainfall in September: 3mm
The wettest month (with the highest rainfall) is November (13mm).
The driest month (with the least rainfall) is July (0mm).
Average rainfall days in September
Alte, Portugal
- Average rainfall days in September: 2.8 days
The month with the highest number of rainy days is April (7.5 days).
The month with the least rainy days is August (0.5 days).
Average daylight in September /
Average sunshine in September
Alte, 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 6min).
Average sunshine days in September
Alte, Portugal
- Average sunshine days in September: 25.9 days
The months with the most sunshine days are July and August (29.8 days).
The month with the least sunshine days is April (20 days).
Average UV index in September
Alte, 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
Alte, Portugal
- Average cloud cover in September: 14
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
Alte, 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).
