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
September brings a marginal elevation to a still warm 23.6°C (74.5°F) from August's 24.5°C (76.1°F) in Oeiras's average high-temperatures. An average nighttime temperature of 18.2°C (64.8°F) is recorded in Oeiras during September.Humidity
In September, the average relative humidity in Oeiras is 73%.Rainfall
In Oeiras, in September, during 4.9 rainfall days, 10mm (0.39") of precipitation is typically accumulated. Throughout the year, in Oeiras, Portugal, there are 85.8 rainfall days, and 215mm (8.46") of precipitation is accumulated.Daylight
The average length of the day in September is 12h and 26min.On the first day of the month, sunrise is at 07:06 and sunset at 20:07. On the last day of September, in Oeiras, sunrise is at 07:32 and sunset at 19:21 WEST.
Sunshine
In Oeiras, the average sunshine in September is 9.4h.UV index
The months with the highest UV index in Oeiras are June through September, with an average maximum UV index of 6. A UV Index of 6 to 7 symbolizes a high health vulnerability from exposure to the Sun's UV rays for ordinary individuals.Note: The UV index of 6 during September translates into the following guidance:
Escape overexposure. People with light skin may incur burns in fewer than 20 minutes. Avoid direct Sun exposure from 10 a.m. to 4 p.m., a period when UV radiation is most intense, and remember that not all shade structures provide full protection. For optimum UV protection, wear sun-resistant attire complemented with a hat and quality shades.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the temperature in September in Oeiras?
What is the average humidity in September in Oeiras?
How many days does it rain in September in Oeiras?
What is the average length of the day in September in Oeiras?
What time are sunrise and sunset in September in Oeiras?
How long on average sun shines in September in Oeiras?
What are the months with the highest UV index in Oeiras?
What is the UV index intensity in September in Oeiras?
Average temperature in September
Oeiras, Portugal
- Average high temperature in September: 23.6°C
The warmest month (with the highest average high temperature) is August (24.5°C).
The month with the lowest average high temperature is January (14.8°C).
- Average low temperature in September: 18.2°C
The month with the highest average low temperature is August (18.6°C).
The coldest month (with the lowest average low temperature) is February (10.8°C).
Average pressure in September
Oeiras, Portugal
- Average pressure in September: 1017mbar
The months with the highest atmospheric pressure are January and December (1022.5mbar).
The month with the lowest atmospheric pressure is April (1015.7mbar).
Average wind speed in September
Oeiras, Portugal
- Average wind speed in September: 15.8km/h
The windiest month (with the highest average wind speed) is February (19.5km/h).
The calmest month (with the lowest average wind speed) is October (15.6km/h).
Average humidity in September
Oeiras, Portugal
- Average humidity in September: 73%
The months with the highest relative humidity are January, April, July and December (75%).
The months with the lowest relative humidity are May and October (72%).
Average rainfall in September
Oeiras, Portugal
- Average rainfall in September: 10mm
The wettest month (with the highest rainfall) is November (44mm).
The driest month (with the least rainfall) is July (2mm).
Average rainfall days in September
Oeiras, Portugal
- Average rainfall days in September: 4.9 days
The month with the highest number of rainy days is November (12.4 days).
The month with the least rainy days is August (1.9 days).
Average daylight in September /
Average sunshine in September
Oeiras, 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 30min).
Average sunshine days in September
Oeiras, Portugal
- Average sunshine days in September: 24.5 days
The month with the most sunshine days is August (28 days).
The month with the least sunshine days is November (15.6 days).
Average UV index in September
Oeiras, 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
Oeiras, 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
Oeiras, 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).
