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
Weather in September
Temperature
The onset of September results in a small decrease in the average high-temperature, moderately receding from a tropical 33.7°C (92.7°F) in August to a moderately hot 29.9°C (85.8°F). Despite drastic daytime highs, Redondo logs an average low-temperature reading of 16.1°C (61°F) throughout September.Heat index
The heat index value during September is estimated at a tropical 31°C (87.8°F). With unrelenting exposure and activity, one might experience exhaustion, leading to potential heat cramps.Metrics for the heat index primarily focus on shaded spots and light wind conditions. The heat index can potentially augment by 15 Fahrenheit (8 Celsius) degrees due to direct sunlight.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', gives a temperature feeling by integrating air temperature and humidity. A person's impression of weather can be shaped by several aspects, among them metabolic variations, pregnancy, and levels of physical activity. Taking into account that direct sunlight can boost the heat effect, the heat index may rise by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely vital to babies and toddlers. Juveniles often do not understand the need to recuperate and rehydrate. Thirst is a delayed symptom of dehydration - hence, it is vital to maintain hydration, particularly during ongoing physical activities.
Humidity
In September, the average relative humidity is 53%.Rainfall
In Redondo, during September, the rain falls for 5.3 days and regularly aggregates up to 16mm (0.63") of precipitation. Throughout the year, in Redondo, there are 95.8 rainfall days, and 310mm (12.2") 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 06:59 and sunset at 20:00. On the last day of September, sunrise is at 07:25 and sunset at 19:14 WEST.
Sunshine
In Redondo, the average sunshine in September is 9.1h.UV index
In September, the average daily maximum UV index is 6. A UV Index of 6 to 7 symbolizes a high health vulnerability from unprotected exposure to Sun's UV rays for the average person.Note: The UV index of 6 in September translates into these instructions:
Shun overexposure. Protection from sun ravages is indispensable. Between 10 a.m. and 4 p.m., the Sun's UV radiation is at its peak. Limit your exposure to direct sunlight during these hours. A hat with a generous brim can prevent nearly 50% of UV rays from reaching your eyes.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How hot does it get in Redondo in September?
What is the average humidity in September in Redondo?
How many days does it rain in September in Redondo?
How many hours of daylight does Redondo have in September?
When is the sunrise / sunset in September in Redondo?
How many hours of sunshine does Redondo have in September?
What is the UV index reading in September in Redondo?
Average temperature in September
Redondo, Portugal
- Average high temperature in September: 29.9°C
The warmest month (with the highest average high temperature) is August (33.7°C).
The month with the lowest average high temperature is January (13.7°C).
- Average low temperature in September: 16.1°C
The month with the highest average low temperature is August (16.9°C).
The coldest month (with the lowest average low temperature) is February (5.2°C).
Average pressure in September
Redondo, Portugal
- Average pressure in September: 1016.4mbar
The month with the highest atmospheric pressure is December (1022.8mbar).
The month with the lowest atmospheric pressure is April (1015.4mbar).
Average wind speed in September
Redondo, Portugal
- Average wind speed in September: 9.7km/h
The windiest months (with the highest average wind speed) are February and March (12km/h).
The calmest month (with the lowest average wind speed) is September (9.7km/h).
Average humidity in September
Redondo, Portugal
- Average humidity in September: 53%
The month with the highest relative humidity is January (82%).
The month with the lowest relative humidity is August (49%).
Average rainfall in September
Redondo, Portugal
- Average rainfall in September: 16mm
The wettest month (with the highest rainfall) is April (52mm).
The driest month (with the least rainfall) is July (2mm).
Average rainfall days in September
Redondo, Portugal
- Average rainfall days in September: 5.3 days
The month with the highest number of rainy days is March (13.8 days).
The month with the least rainy days is August (2 days).
Average daylight in September /
Average sunshine in September
Redondo, 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 1min
The months with the most sunshine are July and August (Average sunshine: 11h and 24min).
The month with the least sunshine is January (Average sunshine: 5h and 0min).
Average sunshine days in September
Redondo, Portugal
- Average sunshine days in September: 23.4 days
The month with the most sunshine days is July (28.8 days).
The month with the least sunshine days is April (15.3 days).
Average UV index in September
Redondo, Portugal
- Average UV index in September: 6
The month with the highest UV index is August (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 3).
Average cloud cover in September
Redondo, Portugal
- Average cloud cover in September: 20
The month with the most cloud cover is January (Cloud cover 44).
The months with the least cloud cover are July and August (Cloud cover 11).
Average visibility in September
Redondo, Portugal
- Average visibility in September: 10km
The months with the highest visibility are June, July, August and September (10km).
The months with the lowest visibility are January and April (8km).
Redondo, Portugal
Weather forecast for your location
2. Allow the app to use your location