September weather forecastCastelo Branco, Portugal
September weather for Castelo Branco, Portugal: September, the first month of the autumn in Castelo Branco, is also a moderately hot month, with an average temperature fluctuating between 28.5°C (83.3°F) and 15.5°C (59.9°F). With the arrival of September, Castelo Branco notices a mild change in the average high-temperature, sliding from August's tropical 32.8°C (91°F) to a warm 28.5°C (83.3°F).
September
Weather in September
September, the first month of the autumn in Castelo Branco, is also a moderately hot month, with an average temperature fluctuating between 28.5°C (83.3°F) and 15.5°C (59.9°F).Temperature
With the arrival of September, Castelo Branco notices a mild change in the average high-temperature, sliding from August's tropical 32.8°C (91°F) to a warm 28.5°C (83.3°F). Throughout September, Castelo Branco notes a dramatic plunge from the daily high to an average low-temperature of 15.5°C (59.9°F).Heat index
The average heat index in September is computed to be 29°C (84.2°F). Ongoing activity coupled with exposure often results in weariness and could induce heat cramps.The metrics for the heat index are tailored for both shady environments and light winds. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'real feel', is the result of factoring in humidity to the air temperature, indicating perceived warmth. An individual's perception of weather can be influenced by a variety of factors including metabolic differences, being pregnant, and their degree of physical exertion. Being under direct sunshine can magnify the heat experience, possibly pushing up the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are largely significant for babies and toddlers. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it's vital to remain hydrated, particularly during prolonged physical activities.
Humidity
The average relative humidity in September in Castelo Branco is 49%.Rainfall
In September, the rain falls for 5 days. Throughout September, 16mm (0.63") of precipitation is accumulated. In Castelo Branco, during the entire year, the rain falls for 97 days and collects up to 369mm (14.53") of precipitation.Snowfall
In Castelo Branco, snow does not fall in February through December.Daylight
In Castelo Branco, the average length of the day in September is 12h and 27min.On the first day of the month, sunrise is at 06:58 and sunset at 20:01. On the last day of September, sunrise is at 07:25 and sunset at 19:13 WEST.
Sunshine
In September, the average sunshine in Castelo Branco is 9.5h.UV index
In Castelo Branco, 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 exposure to the Sun's UV rays for average individuals.Note: The maximum daily UV index, 5 in September, converts into the following recommendations:
Be vigilant - Preventing sunburn is recommended. Being exposed to the midday Sun can have harmful effects due to strong UV radiation; always take precautions. Wearing sunglasses with both UVA and UVB protection effectively reduces sun-induced eye damage.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Castelo Branco, Portugal
- Average high temperature in September: 28.5°C
The warmest month (with the highest average high temperature) is August (32.8°C).
The month with the lowest average high temperature is January (11.6°C).
- Average low temperature in September: 15.5°C
The month with the highest average low temperature is July (17.2°C).
The coldest month (with the lowest average low temperature) is January (3.9°C).
Average pressure in September
Castelo Branco, Portugal
- Average pressure in September: 1016.5mbar
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
Castelo Branco, Portugal
- Average wind speed in September: 8.3km/h
The windiest month (with the highest average wind speed) is February (11.3km/h).
The calmest month (with the lowest average wind speed) is September (8.3km/h).
Average humidity in September
Castelo Branco, Portugal
- Average humidity in September: 49%
The month with the highest relative humidity is January (82%).
The month with the lowest relative humidity is August (44%).
Average rainfall in September
Castelo Branco, Portugal
- Average rainfall in September: 16mm
The wettest month (with the highest rainfall) is November (60mm).
The driest months (with the least rainfall) are July and August (3mm).
Average rainfall days in September
Castelo Branco, Portugal
- Average rainfall days in September: 5 days
The month with the highest number of rainy days is November (12.3 days).
The month with the least rainy days is August (1.5 days).
Average snowfall in September
Castelo Branco, Portugal
- Average snowfall in September: 0mm
The month with the highest snowfall is January (1mm).
The months with the least snowfall are February, March, April, May, June, July, August, September, October, November and December (0mm).
Average snowfall days in September
Castelo Branco, Portugal
- Average snowfall days in September: 0 days
The months with the highest number of snowfall days are January and March (0.1 days).
The months with the least snowfall days are February, April, May, June, July, August, September, October, November and December (0 days).
Average daylight in September /
Average sunshine in September
Castelo Branco, Portugal
- Average daylight in September: 12h and 24min
The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in September: 9h and 30min
The months with the most sunshine are July and August (Average sunshine: 11h and 48min).
The month with the least sunshine is January (Average sunshine: 5h and 12min).
Average sunshine days in September
Castelo Branco, Portugal
- Average sunshine days in September: 23.3 days
The month with the most sunshine days is August (28.3 days).
The month with the least sunshine days is April (16.6 days).
Average UV index in September
Castelo Branco, Portugal
- Average UV index in September: 5
The months with the highest UV index are May, June, July and August (UV index 6).
The month with the lowest UV index is December (UV index 2).
Average cloud cover in September
Castelo Branco, Portugal
- Average cloud cover in September: 16
The month with the most cloud cover is January (Cloud cover 42).
The months with the least cloud cover are July and August (Cloud cover 8).
Average visibility in September
Castelo Branco, Portugal
- Average visibility in September: 10km
The months with the highest visibility are June, July, August and September (10km).
The month with the lowest visibility is January (8km).
