September weather forecastFronteira, Portugal
September
Weather in September
September, the first month of the autumn in Fronteira, is still a warm month, with an average temperature varying between 29.4°C (84.9°F) and 16.3°C (61.3°F).Temperature
In September, the meteorological conditions change slightly, with the average high-temperature moving from a hot 33.3°C (91.9°F) in August to a moderately hot 29.4°C (84.9°F). Throughout the month of September, Fronteira observes a dramatic downturn from the daytime peak temperatures, expecting an average low of 16.3°C (61.3°F).Heat index
September's mean heat index is evaluated at a tropical 30°C (86°F). Uninterrupted activity during exposure could lead to a sense of exhaustion, possibly causing heat cramps.Heat index specifics point out values are for conditions of shade and a slight breeze. The heat index can potentially augment by 15 Fahrenheit (8 Celsius) degrees due to direct sunlight.
Note: The heat index, also known as 'felt air temperature' or 'feels like', is a single figure representing how weather conditions feel when combining temperature and humidity. One's weather perception can be influenced by a range of factors including metabolic differences, being pregnant, and their level of physical activity. Direct sunlight can potentially raise the heat index by 15 Fahrenheit (8 Celsius) degrees, so it's crucial to consider. Heat index values remain especially vital for babies and toddlers. Younglings frequently fail to recognize the requirement to rest and rehydrate. Thirst emerges late in dehydration - it is imperative to keep hydration levels high, particularly during extended physical exertions.
Humidity
In September, the average relative humidity is 48%.Rainfall
In Fronteira, in September, it is raining for 4.8 days, with typically 8mm (0.31") of accumulated precipitation. Throughout the year, there are 78.7 rainfall days, and 219mm (8.62") of precipitation is accumulated.Snowfall
April through December are months without snowfall.Daylight
The average length of the day in September is 12h and 26min.On the first day of the month, sunrise is at 06:59 and sunset at 20:01. On the last day of September, sunrise is at 07:26 and sunset at 19:14 WEST.
Sunshine
In September, the average sunshine is 9.5h.UV index
In Fronteira, the average daily maximum UV index in September is 6. A UV Index reading of 6 to 7 represents a high threat to health from unsafe exposure to UV radiation for ordinary individuals.Note: A maximum UV index of 6 in September translates into the following recommendations:
Sustain precautions and conform to sun safety norms. Preventing sunburn is necessary. Remember that the sun's UV radiation is strongest between 10 a.m. and 4 p.m. Make an effort to avoid direct sun exposure during these hours. During bright days, sunglasses that offer UVA and UVB defense are recommended.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Fronteira, Portugal
- Average high temperature in September: 29.4°C
The warmest month (with the highest average high temperature) is August (33.3°C).
The month with the lowest average high temperature is January (11.9°C).
- Average low temperature in September: 16.3°C
The month with the highest average low temperature is August (17.7°C).
The coldest month (with the lowest average low temperature) is January (4.2°C).
Average pressure in September
Fronteira, Portugal
- Average pressure in September: 1016.3mbar
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
Fronteira, Portugal
- Average wind speed in September: 8.4km/h
The windiest month (with the highest average wind speed) is February (12.1km/h).
The calmest month (with the lowest average wind speed) is September (8.4km/h).
Average humidity in September
Fronteira, Portugal
- Average humidity in September: 48%
The month with the highest relative humidity is January (83%).
The month with the lowest relative humidity is August (43%).
Average rainfall in September
Fronteira, Portugal
- Average rainfall in September: 8mm
The wettest month (with the highest rainfall) is November (39mm).
The driest month (with the least rainfall) is July (3mm).
Average rainfall days in September
Fronteira, Portugal
- Average rainfall days in September: 4.8 days
The month with the highest number of rainy days is April (11.7 days).
The month with the least rainy days is July (1.7 days).
Average snowfall in September
Fronteira, Portugal
- Average snowfall in September: 0mm
The month with the highest snowfall is February (5mm).
The months with the least snowfall are April, May, June, July, August, September, October, November and December (0mm).
Average snowfall days in September
Fronteira, Portugal
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (0.4 days).
The months with the least snowfall days are April, May, June, July, August, September, October, November and December (0 days).
Average daylight in September /
Average sunshine in September
Fronteira, 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 30min).
- 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 6min).
Average sunshine days in September
Fronteira, Portugal
- Average sunshine days in September: 24 days
The month with the most sunshine days is July (28.7 days).
The month with the least sunshine days is April (16.6 days).
Average UV index in September
Fronteira, Portugal
- Average UV index in September: 6
The month with the highest UV index is August (UV index 7).
The months with the lowest UV index are January, February, March, November and December (UV index 3).
Average cloud cover in September
Fronteira, 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
Fronteira, 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).
