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
The arrival of September corresponds with a light shift in temperature, down from 28.3°C (82.9°F) in August to a still warm 24.2°C (75.6°F). Rio de Fornos's average low-temperature of 11.5°C (52.7°F) in September reflects a significant disparity from the daytime highs.Humidity
The average relative humidity in September is 57%.Rainfall
In September, the rain falls for 6.9 days. Throughout September, 27mm (1.06") of precipitation is accumulated. In Rio de Fornos, during the entire year, the rain falls for 141.4 days and collects up to 527mm (20.75") of precipitation.Snowfall
In Rio de Fornos, snow does not fall in April through October.Daylight
In Rio de Fornos, the average length of the day in September is 12h and 29min.On the first day of the month, sunrise is at 06:54 and sunset at 20:01. On the last day of September, in Rio de Fornos, Portugal, sunrise is at 07:24 and sunset at 19:11 WEST.
Sunshine
In September, the average sunshine in Rio de Fornos is 9.8h.UV index
The average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a moderate threat to health from unsafe exposure to UV radiation for ordinary individuals.Note: The maximum UV index of 5 during September translates into these guidelines:
Be vigilant - A duty to shield skin and eyes from injury exists. The mid-day Sun emits the most powerful UV radiation, so seek shade and minimize exposure. For a sun-safe wardrobe, go for clothes that are tightly woven and generously sized.
Frequently asked questions
What is the temperature in September in Rio de Fornos?
What is the average humidity in September in Rio de Fornos?
How many days does it rain in September in Rio de Fornos?
When it does not snow in Rio de Fornos?
What is the average length of the day in September in Rio de Fornos?
When is the sunrise / sunset in September in Rio de Fornos?
How long on average sun shines in September in Rio de Fornos?
What is the UV index reading in September in Rio de Fornos?
Average temperature in September
Rio de Fornos, Portugal
- Average high temperature in September: 24.2°C
The warmest month (with the highest average high temperature) is August (28.3°C).
The month with the lowest average high temperature is January (8.3°C).
- Average low temperature in September: 11.5°C
The month with the highest average low temperature is July (13.8°C).
The coldest month (with the lowest average low temperature) is February (1.2°C).
Average pressure in September
Rio de Fornos, Portugal
- Average pressure in September: 1017.8mbar
The month with the highest atmospheric pressure is December (1022.9mbar).
The month with the lowest atmospheric pressure is April (1015.4mbar).
Average wind speed in September
Rio de Fornos, Portugal
- Average wind speed in September: 8.3km/h
The windiest month (with the highest average wind speed) is March (11.2km/h).
The calmest month (with the lowest average wind speed) is September (8.3km/h).
Average humidity in September
Rio de Fornos, Portugal
- Average humidity in September: 57%
The month with the highest relative humidity is January (85%).
The month with the lowest relative humidity is August (52%).
Average rainfall in September
Rio de Fornos, Portugal
- Average rainfall in September: 27mm
The wettest month (with the highest rainfall) is November (73mm).
The driest month (with the least rainfall) is August (11mm).
Average rainfall days in September
Rio de Fornos, Portugal
- Average rainfall days in September: 6.9 days
The month with the highest number of rainy days is April (17.6 days).
The month with the least rainy days is August (4.2 days).
Average snowfall in September
Rio de Fornos, Portugal
- Average snowfall in September: 0mm
The month with the highest snowfall is February (19mm).
The months with the least snowfall are April, May, June, July, August, September and October (0mm).
Average snowfall days in September
Rio de Fornos, Portugal
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (2.1 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Rio de Fornos, Portugal
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in September: 9h and 5min
The month with the most sunshine is July (Average sunshine: 11h and 48min).
The month with the least sunshine is January (Average sunshine: 4h and 48min).
Average sunshine days in September
Rio de Fornos, Portugal
- Average sunshine days in September: 20.8 days
The month with the most sunshine days is August (24.5 days).
The month with the least sunshine days is April (10.8 days).
Average UV index in September
Rio de Fornos, Portugal
- Average UV index in September: 5
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in September
Rio de Fornos, Portugal
- Average cloud cover in September: 20
The month with the most cloud cover is January (Cloud cover 50).
The months with the least cloud cover are July and August (Cloud cover 13).
Average visibility in September
Rio de Fornos, 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, November and December (8km).
Rio de Fornos, Portugal
Weather forecast for your location
2. Allow the app to use your location
