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
September
Weather in September
Temperature
The arrival of September signals a subtle shift in temperature, down from 29.8°C (85.6°F) in August to a still warm 25.8°C (78.4°F). Valhelhas's September nights cool down significantly from the day's heat, to an average low-temperature of 12.8°C (55°F).Humidity
In September, the average relative humidity in Valhelhas, Portugal, is 56%.Rainfall
In September, the rain falls for 4.8 days. Throughout September, 15mm (0.59") of precipitation is accumulated. Throughout the year, there are 116.6 rainfall days, and 496mm (19.53") of precipitation is accumulated.Snowfall
In Valhelhas, snow does not fall in May through September.Daylight
In September, the average length of the day in Valhelhas is 12h and 28min.On the first day of the month, sunrise is at 06:57 and sunset at 20:01. On the last day of September, in Valhelhas, sunrise is at 07:25 and sunset at 19:13 WEST.
Sunshine
The average sunshine in September is 9.4h.UV index
The average daily maximum UV index in September in Valhelhas is 5. A UV Index reading of 3 to 5 represents a medium vulnerability from unprotected exposure to Sun's UV rays for the average person.Note: The daily high UV index of 5 in September translates into this advice:
Undertake precautions - It is suggested to shield oneself from sunburn. Avoiding the Sun during its peak radiation time around midday is a healthy practice. Sunglasses that ward off UVA and UVB rays play a pivotal role in reducing solar eye damage.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the temperature in September in Valhelhas?
What is the average humidity in September in Valhelhas?
How much does it rain in Valhelhas in September?
When it does not snow in Valhelhas?
Does it snow in Valhelhas in September?
How many hours of daylight does Valhelhas have in September?
What time are sunrise and sunset in September in Valhelhas?
How long on average sun shines in September in Valhelhas?
How high is the UV index in September in Valhelhas?
Average temperature in September
Valhelhas, 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
Valhelhas, 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
Valhelhas, 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
Valhelhas, 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
Valhelhas, 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
Valhelhas, 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
Valhelhas, 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
Valhelhas, 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
Valhelhas, 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 18min).
- 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
Valhelhas, 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
Valhelhas, 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
Valhelhas, 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
Valhelhas, 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).
