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
September's onset brings a negligible change in high-temperatures, falling from a hot 32.8°C (91°F) in August to a warm 28.6°C (83.5°F). Despite the intense daytime heat, Alcains sustains a steady low-temperature average of 15.4°C (59.7°F) during September.Heat index
Throughout September, the heat index is estimated at 29°C (84.2°F). Uninterrupted activity during exposure could lead to a sense of exhaustion, possibly causing heat cramps.Note that heat index values are valued for light wind and location in the shade. Uninterrupted exposure to the sun may boost the heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'real feel', is what the temperature feels like to the human body when the air temperature is combined with the relative humidity. One's perception of temperature can vary depending on physical activity and individual heat sensitivity, influenced by factors like wind, attire, and metabolic variations. It is essential to be conscious of the fact that direct sunlight can intensify the felt heat, leading to an elevation in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values hold particular significance for children. Young ones are generally at greater risk than adults due to their limited sweating ability. In addition, their large skin surface relative to their small bodies and higher heat production from their activities add to their vulnerability.
Humidity
In September, the average relative humidity is 49%.Rainfall
In September, the rain falls for 5.2 days. Throughout September, 18mm (0.71") of precipitation is accumulated. In Alcains, during the entire year, the rain falls for 97.2 days and collects up to 371mm (14.61") of precipitation.Snowfall
February through December are months without snowfall.Daylight
The average length of the day in September is 12h and 27min.On the first day of September, sunrise is at 06:58 and sunset at 20:01. On the last day of the month, 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 is 5. A UV Index value of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV radiation for average individuals.Note: A maximum UV index of 5 in September translates into the following recommendations:
Guard yourself - Precautionary measures against sun damage are advocated. Midday is the peak time for the Sun's radiation; stay in the shade and protect yourself. Experience reduced UV exposure by about half when donning a wide-brim hat.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How hot does it get in September?
What is the average humidity in September in Alcains?
How many days does it rain in September?
When it does not snow?
How many hours of daylight does Alcains have in September?
What time are sunrise and sunset in September?
How long on average sun shines in September?
How high is the UV index in September?
Average temperature in September
Alcains, Portugal
- Average high temperature in September: 28.6°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: 15.4°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
Alcains, 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
Alcains, 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
Alcains, 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
Alcains, Portugal
- Average rainfall in September: 18mm
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
Alcains, Portugal
- Average rainfall days in September: 5.2 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
Alcains, 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
Alcains, 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
Alcains, Portugal
- Average daylight in September: 12h and 2min
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 48min).
The month with the least sunshine is January (Average sunshine: 5h and 12min).
Average sunshine days in September
Alcains, 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
Alcains, 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
Alcains, Portugal
- Average cloud cover in September: 17
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
Alcains, 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).
