September weather forecastRiola, Spain
September
Weather in September
The first month of the autumn, September, is still a warm month in Riola, Spain, with an average temperature fluctuating between 19.2°C (66.6°F) and 27.2°C (81°F).Temperature
Riola's weather in September involves a mild decrease in the average high-temperature, moving down slightly from August's tropical 31°C (87.8°F) to a warm 27.2°C (81°F). Riola records an average nighttime low of 19.2°C (66.6°F) in September.Heat index
The heat index value during September is appraised at 29°C (84.2°F). When exposure and activity are sustained, they could induce fatigue, with a chance of heat cramps.Always consider that heat index estimations are for light winds and places in the shade. Direct sunlight exposure may result in a rise of the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', is a measure of how hot it feels when the actual air humidity is factored in. The impression of weather on a person can be swayed by additional aspects, including metabolic variations, pregnancy, and activity levels. In direct sunlight, the heat's impact can be heightened, potentially leading to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely vital to babies and toddlers. Young ones often disregard the necessity to rest and hydrate. Thirst usually indicates advanced dehydration - hence, it is key to stay hydrated, particularly during ongoing physical activities.
Humidity
In September, the average relative humidity is 65%.Rainfall
In September, in Riola, Spain, the rain falls for 7.8 days. Throughout September, 34mm (1.34") of precipitation is accumulated. Throughout the year, there are 87.2 rainfall days, and 294mm (11.57") of precipitation is accumulated.Snowfall
In Riola, Spain, snow does not fall in February through December.Daylight
The average length of the day in September in Riola is 12h and 26min.On the first day of the month, sunrise is at 07:30 and sunset at 20:31. On the last day of September, in Riola, sunrise is at 07:56 and sunset at 19:45 CEST.
Sunshine
The average sunshine in September in Riola is 9.1h.UV index
The average daily maximum UV index in September is 6. A UV Index value 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:
Avoid overexposure. Fair-skinned individuals can burn in under 20 minutes. Seek shade and limit direct sun exposure between 10 a.m. and 4 p.m., the peak period for UV radiation. Keep in mind that shade structures like parasols or canopies do not offer complete sun protection. Stay sun-safe with clothing that is both closely woven and worn loosely.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Riola, Spain
- Average high temperature in September: 27.2°C
The warmest month (with the highest average high temperature) is August (31°C).
The month with the lowest average high temperature is January (14.6°C).
- Average low temperature in September: 19.2°C
The month with the highest average low temperature is August (22.2°C).
The coldest month (with the lowest average low temperature) is January (7.1°C).
Average pressure in September
Riola, Spain
- Average pressure in September: 1016.9mbar
The month with the highest atmospheric pressure is December (1021.8mbar).
The month with the lowest atmospheric pressure is April (1014.8mbar).
Average wind speed in September
Riola, Spain
- Average wind speed in September: 8.7km/h
The windiest month (with the highest average wind speed) is January (14.7km/h).
The calmest months (with the lowest average wind speed) are September and October (8.7km/h).
Average humidity in September
Riola, Spain
- Average humidity in September: 65%
The months with the highest relative humidity are October and December (66%).
The month with the lowest relative humidity is June (57%).
Average rainfall in September
Riola, Spain
- Average rainfall in September: 34mm
The wettest month (with the highest rainfall) is March (45mm).
The driest month (with the least rainfall) is July (7mm).
Average rainfall days in September
Riola, Spain
- Average rainfall days in September: 7.8 days
The month with the highest number of rainy days is April (10.8 days).
The month with the least rainy days is August (4.5 days).
Average snowfall in September
Riola, Spain
- Average snowfall in September: 0mm
The month with the highest snowfall is January (2mm).
The months with the least snowfall are February, March, April, May, June, July, August, September, October, November and December (0mm).
Average snowfall days in September
Riola, Spain
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (0.1 days).
The months with the least snowfall days are February, March, April, May, June, July, August, September, October, November and December (0 days).
Average daylight in September /
Average sunshine in September
Riola, Spain
- Average daylight in September: 12h and 24min
The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 30min).
- Average sunshine in September: 9h and 6min
The month with the most sunshine is June (Average sunshine: 11h and 54min).
The months with the least sunshine are November and December (Average sunshine: 6h and 54min).
Average sunshine days in September
Riola, Spain
- Average sunshine days in September: 20.4 days
The month with the most sunshine days is July (24.5 days).
The month with the least sunshine days is April (16.5 days).
Average UV index in September
Riola, Spain
- Average UV index in September: 6
The months with the highest UV index are June, July and August (UV index 7).
The months with the lowest UV index are January, February, March, November and December (UV index 4).
Average cloud cover in September
Riola, Spain
- Average cloud cover in September: 19
The months with the most cloud cover are March and April (Cloud cover 27).
The month with the least cloud cover is July (Cloud cover 12).
Average visibility in September
Riola, Spain
- 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).
