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 introduction of September notes a subtle temperature variation to a still pleasant 22.4°C (72.3°F) from August's 22.8°C (73°F). During the month of September, Quatro Ribeiras identifies an average nighttime low-temperature of 21.2°C (70.2°F), slightly lower than its daytime counterpart.Humidity
In Quatro Ribeiras, Portugal, the average relative humidity in September is 78%.Rainfall
In Quatro Ribeiras, during September, the rain falls for 13 days and regularly aggregates up to 28mm (1.1") of precipitation. In Quatro Ribeiras, during the entire year, the rain falls for 174.3 days and collects up to 535mm (21.06") of precipitation.Daylight
In Quatro Ribeiras, Portugal, the average length of the day in September is 12h and 26min.On the first day of the month, sunrise is at 07:18 and sunset at 20:18. On the last day of September, in Quatro Ribeiras, sunrise is at 07:44 and sunset at 19:32 +00.
Sunshine
In Quatro Ribeiras, the average sunshine in September is 8.1h.UV index
The average daily maximum UV index in September in Quatro Ribeiras is 5. A UV Index estimate of 3 to 5 represents a moderate health risk from unprotected exposure to Sun's UV rays for the ordinary person.Note: A maximum UV index of 5 in September translates into the following recommendations:
Stay alert. Light-skinned people could suffer burns in less than 30 minutes. Considering the strength of solar radiation at midday, one should avoid direct Sun exposure. For optimum UV protection, wear sun-resistant attire complemented with a hat and quality shades.
Frequently asked questions
What are September temperatures in Quatro Ribeiras?
What is the average humidity in September in Quatro Ribeiras?
How many days does it rain in September in Quatro Ribeiras?
How many hours of daylight does Quatro Ribeiras have in September?
When are sunrise and sunset in September in Quatro Ribeiras?
How long on average sun shines in September in Quatro Ribeiras?
What is the UV index reading in September in Quatro Ribeiras?
Average temperature in September
Quatro Ribeiras, Portugal
- Average high temperature in September: 22.4°C
The warmest month (with the highest average high temperature) is August (22.8°C).
The month with the lowest average high temperature is March (15.6°C).
- Average low temperature in September: 21.2°C
The month with the highest average low temperature is August (21.6°C).
The coldest months (with the lowest average low temperature) are February and March (14.3°C).
Average pressure in September
Quatro Ribeiras, Portugal
- Average pressure in September: 1020.9mbar
The month with the highest atmospheric pressure is July (1024.4mbar).
The month with the lowest atmospheric pressure is October (1016.6mbar).
Average wind speed in September
Quatro Ribeiras, Portugal
- Average wind speed in September: 21.3km/h
The windiest month (with the highest average wind speed) is December (29.8km/h).
The calmest month (with the lowest average wind speed) is July (16.6km/h).
Average humidity in September
Quatro Ribeiras, Portugal
- Average humidity in September: 78%
The month with the highest relative humidity is June (83%).
The month with the lowest relative humidity is November (77%).
Average rainfall in September
Quatro Ribeiras, Portugal
- Average rainfall in September: 28mm
The wettest month (with the highest rainfall) is December (93mm).
The driest month (with the least rainfall) is July (15mm).
Average rainfall days in September
Quatro Ribeiras, Portugal
- Average rainfall days in September: 13 days
The month with the highest number of rainy days is October (19.5 days).
The month with the least rainy days is July (9 days).
Average daylight in September /
Average sunshine in September
Quatro Ribeiras, 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: 8h and 1min
The month with the most sunshine is July (Average sunshine: 9h and 24min).
The month with the least sunshine is November (Average sunshine: 5h and 0min).
Average sunshine days in September
Quatro Ribeiras, Portugal
- Average sunshine days in September: 12.3 days
The month with the most sunshine days is July (18.1 days).
The month with the least sunshine days is October (6.6 days).
Average UV index in September
Quatro Ribeiras, Portugal
- Average UV index in September: 5
The months with the highest UV index are July and August (UV index 6).
The months with the lowest UV index are January, February, March, April and December (UV index 4).
Average cloud cover in September
Quatro Ribeiras, Portugal
- Average cloud cover in September: 39
The month with the most cloud cover is November (Cloud cover 52).
The month with the least cloud cover is September (Cloud cover 39).
Average visibility in September
Quatro Ribeiras, 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).
Quatro Ribeiras, Portugal
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