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
With the commencement of September, Rio de Moinhos records a moderate temperature decline, with the average high easing from August's hot 32.7°C (90.9°F) to a warm 29.5°C (85.1°F). Despite a significant disparity with daytime temperatures, an average low-temperature of 15°C (59°F) is recorded in Rio de Moinhos, Portugal, during September.Heat index
For September, the heat index is calculated to be a hot 31°C (87.8°F). Long-lasting exposure and activity potentially induce a sense of weariness, with the risk of heat cramps.It is crucial to understand that heat index figures are for shade and gentle wind conditions. The heat index values could be amplified by up to 15 Fahrenheit (8 Celsius) degrees in direct sunlight.
Note: The heat index, also known as 'real feel' or 'felt air temperature', combines both the air temperature and the humidity level to give a perceived human temperature. The influence of weather is personal, differing among individuals based on variations in body mass, stature, and the degree of physical exertion. Being aware that direct sunlight can impact the felt heat might mean an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially vital to children. Kids generally face higher risks than adults as they sweat less. Along with their large skin surface compared to their small bodies and higher heat production due to their activities, their vulnerability is increased.
Humidity
In September, the average relative humidity is 57%.Rainfall
In Rio de Moinhos, Portugal, in September, it is raining for 4.1 days, with typically 13mm (0.51") of accumulated precipitation. In Rio de Moinhos, during the entire year, the rain falls for 84.9 days and collects up to 277mm (10.91") of precipitation.Daylight
In September, the average length of the day in Rio de Moinhos is 12h and 26min.On the first day of the month, sunrise is at 07:01 and sunset at 20:03. On the last day of September, sunrise is at 07:28 and sunset at 19:16 WEST.
Sunshine
In Rio de Moinhos, the average sunshine in September is 9.3h.UV index
In September, the average daily maximum UV index in Rio de Moinhos is 5. A UV Index estimate of 3 to 5 represents a medium health hazard from exposure to the Sun's UV radiation for the ordinary person.Note: The maximum UV index of 5 during September leads to these instructions:
Guard yourself - Precautionary measures against sun damage are advocated. It's crucial to reduce time in the direct Sun around mid-day due to the intense solar radiation. By wearing a generously brimmed hat, you can cut UV radiation exposure significantly.
Frequently asked questions
How hot is it in Rio de Moinhos in September?
What is the average humidity in September in Rio de Moinhos?
How many days does it rain in September in Rio de Moinhos?
What is the average length of the day in September in Rio de Moinhos?
What time are sunrise and sunset in September in Rio de Moinhos?
How many hours of sunshine does Rio de Moinhos have in September?
How high is the UV index in September in Rio de Moinhos?
Average temperature in September
Rio de Moinhos, Portugal
- Average high temperature in September: 29.5°C
The warmest month (with the highest average high temperature) is August (32.7°C).
The month with the lowest average high temperature is January (13.3°C).
- Average low temperature in September: 15°C
The month with the highest average low temperature is August (15.7°C).
The coldest month (with the lowest average low temperature) is January (5.7°C).
Average pressure in September
Rio de Moinhos, Portugal
- Average pressure in September: 1016.5mbar
The month with the highest atmospheric pressure is December (1022.8mbar).
The month with the lowest atmospheric pressure is April (1015.3mbar).
Average wind speed in September
Rio de Moinhos, Portugal
- Average wind speed in September: 9.8km/h
The windiest month (with the highest average wind speed) is February (12.6km/h).
The calmest month (with the lowest average wind speed) is September (9.8km/h).
Average humidity in September
Rio de Moinhos, Portugal
- Average humidity in September: 57%
The month with the highest relative humidity is January (81%).
The month with the lowest relative humidity is August (55%).
Average rainfall in September
Rio de Moinhos, Portugal
- Average rainfall in September: 13mm
The wettest month (with the highest rainfall) is November (50mm).
The driest months (with the least rainfall) are July and August (3mm).
Average rainfall days in September
Rio de Moinhos, Portugal
- Average rainfall days in September: 4.1 days
The month with the highest number of rainy days is November (11.2 days).
The month with the least rainy days is August (1.6 days).
Average daylight in September /
Average sunshine in September
Rio de Moinhos, Portugal
- Average daylight in September: 12h and 2min
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 24min).
- Average sunshine in September: 9h and 2min
The month with the most sunshine is July (Average sunshine: 11h and 36min).
The month with the least sunshine is January (Average sunshine: 5h and 6min).
Average sunshine days in September
Rio de Moinhos, Portugal
- Average sunshine days in September: 25.2 days
The months with the most sunshine days are July and August (28.7 days).
The month with the least sunshine days is November (17.9 days).
Average UV index in September
Rio de Moinhos, Portugal
- Average UV index in September: 5
The months with the highest UV index are May, June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 3).
Average cloud cover in September
Rio de Moinhos, Portugal
- Average cloud cover in September: 18
The month with the most cloud cover is January (Cloud cover 43).
The month with the least cloud cover is July (Cloud cover 12).
Average visibility in September
Rio de Moinhos, Portugal
- Average visibility in September: 9km
The month with the highest visibility is June (10km).
The month with the lowest visibility is January (8km).
Rio de Moinhos, Portugal
Weather forecast for your location
2. Allow the app to use your location
