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
September brings a slight decrease in temperature, down from 29.8°C (85.6°F) in August to a still warm 25.8°C (78.4°F). In September, the temperature in São Gião sees a substantial plunge from daytime highs to a low average of 12.8°C (55°F).Humidity
In São Gião, Portugal, the average relative humidity in September is 56%.Rainfall
In September, in São Gião, the rain falls for 4.8 days. Throughout September, 15mm (0.59") of precipitation is accumulated. Throughout the year, in São Gião, Portugal, there are 116.6 rainfall days, and 496mm (19.53") of precipitation is accumulated.Snowfall
May through September are months without snowfall in São Gião.Daylight
In September, the average length of the day is 12h and 28min.On the first day of September, sunrise is at 06:59 and sunset at 20:02. On the last day of the month, sunrise is at 07:27 and sunset at 19:14 WEST.
Sunshine
In September, the average sunshine in São Gião, Portugal, is 9.4h.UV index
In São Gião, the average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV radiation for the average person.Note: In September, the UV index of 5 transforms into the following advice:
Be vigilant - Suggestions to stave off sun damage are provided. The Sun is most powerful around mid-day, so it's a good practice to reduce direct exposure. Consider a wide-brim hat essential for effective sun defense covering your face, neck, and eyes.
Frequently asked questions
What is the temperature in September in São Gião?
What is the average humidity in September in São Gião?
How many days does it rain in September in São Gião?
When it does not snow in São Gião?
Does it snow in São Gião in September?
How many hours of daylight does São Gião have in September?
When is the sunrise / sunset in September in São Gião?
How many hours of sunshine does São Gião have in September?
What is the UV index intensity in September in São Gião?
Average temperature in September
São Gião, Portugal
- Average high temperature in September: 25.8°C
The warmest month (with the highest average high temperature) is August (29.8°C).
The month with the lowest average high temperature is January (9.8°C).
- Average low temperature in September: 12.8°C
The month with the highest average low temperature is August (14.2°C).
The coldest month (with the lowest average low temperature) is January (2.3°C).
Average pressure in September
São Gião, Portugal
- Average pressure in September: 1016.8mbar
The month with the highest atmospheric pressure is December (1023mbar).
The month with the lowest atmospheric pressure is April (1015.2mbar).
Average wind speed in September
São Gião, Portugal
- Average wind speed in September: 8.3km/h
The windiest month (with the highest average wind speed) is February (11.5km/h).
The calmest month (with the lowest average wind speed) is September (8.3km/h).
Average humidity in September
São Gião, Portugal
- Average humidity in September: 56%
The month with the highest relative humidity is January (85%).
The month with the lowest relative humidity is August (51%).
Average rainfall in September
São Gião, Portugal
- Average rainfall in September: 15mm
The wettest month (with the highest rainfall) is December (83mm).
The driest months (with the least rainfall) are July and August (7mm).
Average rainfall days in September
São Gião, Portugal
- Average rainfall days in September: 4.8 days
The month with the highest number of rainy days is April (16.1 days).
The month with the least rainy days is August (2.5 days).
Average snowfall in September
São Gião, Portugal
- Average snowfall in September: 0mm
The month with the highest snowfall is January (62mm).
The months with the least snowfall are May, June, July, August and September (0mm).
Average snowfall days in September
São Gião, Portugal
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (4.2 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
São Gião, Portugal
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in September: 9h and 2min
The months with the most sunshine are July and August (Average sunshine: 11h and 36min).
The month with the least sunshine is January (Average sunshine: 4h and 30min).
Average sunshine days in September
São Gião, Portugal
- Average sunshine days in September: 24.7 days
The month with the most sunshine days is August (27.5 days).
The month with the least sunshine days is April (12.7 days).
Average UV index in September
São Gião, 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, November and December (UV index 2).
Average cloud cover in September
São Gião, Portugal
- Average cloud cover in September: 19
The month with the most cloud cover is January (Cloud cover 52).
The month with the least cloud cover is August (Cloud cover 12).
Average visibility in September
São Gião, Portugal
- Average visibility in September: 9km
The months with the highest visibility are July and August (10km).
The month with the lowest visibility is January (7km).
São Gião, Portugal
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