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
As September unfolds, the average high-temperature reaches a still warm 26.5°C (79.7°F), hinting at a slight fluctuation from the previous month. São Francisco observes an average low-temperature of 16.9°C (62.4°F) during September.Humidity
In September, the average relative humidity is 67%.Rainfall
In São Francisco, Portugal, in September, during 3.6 rainfall days, 7mm (0.28") of precipitation is typically accumulated. Throughout the year, in São Francisco, there are 78.2 rainfall days, and 171mm (6.73") 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 07:05 and sunset at 20:05. On the last day of September, in São Francisco, sunrise is at 07:31 and sunset at 19:20 WEST.
Sunshine
The average sunshine in September in São Francisco is 9.4h.UV index
The months with the highest UV index are June through September, with an average maximum UV index of 6. A UV Index of 6 to 7 symbolizes a high threat to health from unsafe exposure to UV radiation for ordinary individuals.Note: The UV index of 6 during September leads to these advisories:
Guard oneself from overexposure. Defence against sun injury is vital. Minimize exposure to direct sunlight and seek shade from 10 a.m. to 4 p.m., when UV radiation is most intense, but remember that shade structures may not offer complete protection. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
Frequently asked questions
What are September temperatures in São Francisco?
What is the average humidity in September in São Francisco?
How many days does it rain in September in São Francisco?
What is the average length of the day in September in São Francisco?
When is the sunrise / sunset in September in São Francisco?
How many hours of sunshine does São Francisco have in September?
What is the month with the highest UV index in São Francisco?
What is the UV index reading in September in São Francisco?
Average temperature in September
São Francisco, Portugal
- Average high temperature in September: 26.5°C
The warmest month (with the highest average high temperature) is August (28.5°C).
The month with the lowest average high temperature is January (14.8°C).
- Average low temperature in September: 16.9°C
The months with the highest average low temperature are July and August (17.3°C).
The coldest month (with the lowest average low temperature) is February (9°C).
Average pressure in September
São Francisco, Portugal
- Average pressure in September: 1016.9mbar
The month with the highest atmospheric pressure is December (1022.6mbar).
The month with the lowest atmospheric pressure is April (1015.6mbar).
Average wind speed in September
São Francisco, Portugal
- Average wind speed in September: 11.8km/h
The windiest month (with the highest average wind speed) is February (15km/h).
The calmest month (with the lowest average wind speed) is September (11.8km/h).
Average humidity in September
São Francisco, Portugal
- Average humidity in September: 67%
The month with the highest relative humidity is January (77%).
The month with the lowest relative humidity is August (66%).
Average rainfall in September
São Francisco, Portugal
- Average rainfall in September: 7mm
The wettest month (with the highest rainfall) is November (34mm).
The driest months (with the least rainfall) are July and August (2mm).
Average rainfall days in September
São Francisco, Portugal
- Average rainfall days in September: 3.6 days
The month with the highest number of rainy days is April (11 days).
The month with the least rainy days is August (1.6 days).
Average daylight in September /
Average sunshine in September
São Francisco, 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 2min
The month with the most sunshine is July (Average sunshine: 11h and 18min).
The month with the least sunshine is January (Average sunshine: 5h and 18min).
Average sunshine days in September
São Francisco, Portugal
- Average sunshine days in September: 25.3 days
The month with the most sunshine days is August (28 days).
The month with the least sunshine days is April (17.2 days).
Average UV index in September
São Francisco, Portugal
- Average UV index in September: 6
The months with the highest UV index are June, July, August and September (UV index 6).
The month with the lowest UV index is December (UV index 3).
Average cloud cover in September
São Francisco, Portugal
- Average cloud cover in September: 17
The month with the most cloud cover is January (Cloud cover 41).
The month with the least cloud cover is August (Cloud cover 13).
Average visibility in September
São Francisco, 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).
São Francisco, Portugal
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