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 snowfall in September
- Average snowfall 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
Weather in September
Temperature
September is marked by a subtle drop in average high-temperatures, transitioning from 29.6°C (85.3°F) in August to a still warm 26.5°C (79.7°F). The nighttime temperature during September displays a significant divergence from daily peaks, averaging at a fresh 12.5°C (54.5°F).Humidity
In Nelas, Portugal, the average relative humidity in September is 60%.Rainfall
In Nelas, during September, the rain falls for 6.2 days and regularly aggregates up to 21mm (0.83") of precipitation. Throughout the year, there are 125.4 rainfall days, and 553mm (21.77") of precipitation is accumulated.Snowfall
In Nelas, snow does not fall in April through October and December.Daylight
In Nelas, the average length of the day in September is 12h and 28min.On the first day of September, sunrise is at 06:59 and sunset at 20:03. On the last day of the month, sunrise is at 07:27 and sunset at 19:15 WEST.
Sunshine
In September, the average sunshine is 9.3h.UV index
In Nelas, Portugal, the average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a moderate health risk from unprotected exposure to Sun's UV rays for the average person.Note: The UV index of 5 during September leads to these advisories:
Be vigilant - A duty to shield skin and eyes from injury exists. The Sun's radiation is especially intense around midday; try to stay in shade during this period. On days when the sun blazes, arm yourself with sunglasses that block UVA and UVB radiation.
Frequently asked questions
What is the temperature in September in Nelas?
What is the average humidity in September in Nelas?
How many days does it rain in September in Nelas?
When it does not snow in Nelas?
What is the average length of the day in September in Nelas?
When is the sunrise / sunset in September in Nelas?
How long on average sun shines in September in Nelas?
What is the UV index intensity in September in Nelas?
Average temperature in September
Nelas, Portugal
- Average high temperature in September: 26.5°C
The warmest month (with the highest average high temperature) is August (29.6°C).
The month with the lowest average high temperature is January (10.7°C).
- Average low temperature in September: 12.5°C
The month with the highest average low temperature is August (13.5°C).
The coldest month (with the lowest average low temperature) is January (3.1°C).
Average pressure in September
Nelas, Portugal
- Average pressure in September: 1017mbar
The month with the highest atmospheric pressure is December (1022.9mbar).
The month with the lowest atmospheric pressure is April (1015.2mbar).
Average wind speed in September
Nelas, Portugal
- Average wind speed in September: 7km/h
The windiest month (with the highest average wind speed) is March (9.1km/h).
The calmest month (with the lowest average wind speed) is September (7km/h).
Average humidity in September
Nelas, Portugal
- Average humidity in September: 60%
The month with the highest relative humidity is January (85%).
The month with the lowest relative humidity is August (57%).
Average rainfall in September
Nelas, Portugal
- Average rainfall in September: 21mm
The wettest month (with the highest rainfall) is December (92mm).
The driest month (with the least rainfall) is July (6mm).
Average rainfall days in September
Nelas, Portugal
- Average rainfall days in September: 6.2 days
The month with the highest number of rainy days is November (15.5 days).
The month with the least rainy days is August (3.3 days).
Average snowfall in September
Nelas, Portugal
- Average snowfall in September: 0mm
The months with the highest snowfall are January and February (3mm).
The months with the least snowfall are April, May, June, July, August, September, October and December (0mm).
Average snowfall days in September
Nelas, Portugal
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (0.4 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Nelas, Portugal
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in September: 9h and 2min
The month with the most sunshine is July (Average sunshine: 11h and 30min).
The month with the least sunshine is January (Average sunshine: 4h and 42min).
Average sunshine days in September
Nelas, Portugal
- Average sunshine days in September: 22.9 days
The month with the most sunshine days is August (26.8 days).
The month with the least sunshine days is April (13 days).
Average UV index in September
Nelas, Portugal
- Average UV index in September: 5
The months with the highest UV index are July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in September
Nelas, Portugal
- Average cloud cover in September: 22
The month with the most cloud cover is January (Cloud cover 52).
The months with the least cloud cover are July and August (Cloud cover 17).
Average visibility in September
Nelas, Portugal
- Average visibility in September: 9km
The months with the highest visibility are June, July, August and September (9km).
The months with the lowest visibility are January and November (7km).
Nelas, Portugal
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