September weather forecastSão Facundo, Portugal
September
Weather in September
The first month of the autumn, September, is still a warm month in São Facundo, Portugal, with an average temperature ranging between max 29.5°C (85.1°F) and min 15°C (59°F).Temperature
The transition to September results in a modest reduction in average high-temperature, moving from a hot 32.7°C (90.9°F) in August to a moderately hot 29.5°C (85.1°F). In São Facundo, the nighttime chill during September is a clear shift from the day's highs, with an average of 15°C (59°F).Heat index
In September, the average heat index is computed to be a hot 31°C (87.8°F). If exposure and activity persist, fatigue could ensue, possibly leading to heat cramps.Remember that heat index calculations are made for conditions in the shade with light wind. Exposure to the direct sun might augment heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'real feel', is a fusion of air temperature and moisture levels to demonstrate the sensation of heat. The influence of weather is personal, differing among individuals based on variations in body mass, stature, and the degree of physical exertion. Keep aware, the sun, when shining directly, can intensify the heat experience, pushing the heat index up by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Juveniles are regularly less conscious of the need to recuperate and rehydrate. Thirst is a tardy symptom of dehydration - hydration, especially during lengthy physical activities, should be maintained.
Humidity
The average relative humidity in September is 57%.Rainfall
In São Facundo, during September, the rain falls for 4.3 days and regularly aggregates up to 16mm (0.63") of precipitation. In São Facundo, during the entire year, the rain falls for 85.1 days and collects up to 280mm (11.02") of precipitation.Daylight
The average length of the day in September is 12h and 26min.On the first day of the month, sunrise is at 07:01 and sunset at 20:03. On the last day of September, sunrise is at 07:28 and sunset at 19:16 WEST.
Sunshine
In September, the average sunshine is 9.2h.UV index
The months with the highest UV index in São Facundo are May through September, with an average maximum UV index of 6. A UV Index reading of 6 to 7 represents a high threat to health from unprotected exposure to Sun's UV rays for the ordinary person.Note: The maximum UV index of 6 during September translates into these guidelines:
Undertake protective measures and comply with sun safety rules. Shielding against skin and eye damage is essential. The time between 10 a.m. and 4 p.m. is when UV radiation is at its peak. Limit exposure to direct sunlight during these hours. Clothes that are both tight-knit and comfortably loose are prime choices for sun protection.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
São Facundo, Portugal
- Average high temperature in September: 29.5°C
The warmest month (with the highest average high temperature) is August (32.7°C).
The month with the lowest average high temperature is January (13.3°C).
- Average low temperature in September: 15°C
The month with the highest average low temperature is August (15.7°C).
The coldest month (with the lowest average low temperature) is January (5.7°C).
Average pressure in September
São Facundo, Portugal
- Average pressure in September: 1016.5mbar
The month with the highest atmospheric pressure is December (1022.8mbar).
The month with the lowest atmospheric pressure is April (1015.3mbar).
Average wind speed in September
São Facundo, Portugal
- Average wind speed in September: 9.8km/h
The windiest month (with the highest average wind speed) is February (12.6km/h).
The calmest month (with the lowest average wind speed) is September (9.8km/h).
Average humidity in September
São Facundo, Portugal
- Average humidity in September: 57%
The month with the highest relative humidity is January (81%).
The month with the lowest relative humidity is August (55%).
Average rainfall in September
São Facundo, Portugal
- Average rainfall in September: 16mm
The wettest month (with the highest rainfall) is November (50mm).
The driest months (with the least rainfall) are July and August (3mm).
Average rainfall days in September
São Facundo, Portugal
- Average rainfall days in September: 4.3 days
The month with the highest number of rainy days is November (11.2 days).
The month with the least rainy days is August (1.6 days).
Average daylight in September /
Average sunshine in September
São Facundo, 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 12min
The month with the most sunshine is July (Average sunshine: 11h and 36min).
The month with the least sunshine is January (Average sunshine: 5h and 6min).
Average sunshine days in September
São Facundo, Portugal
- Average sunshine days in September: 25 days
The months with the most sunshine days are July and August (28.7 days).
The month with the least sunshine days is November (17.9 days).
Average UV index in September
São Facundo, Portugal
- Average UV index in September: 6
The months with the highest UV index are May, June, July, August and September (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 3).
Average cloud cover in September
São Facundo, Portugal
- Average cloud cover in September: 19
The month with the most cloud cover is January (Cloud cover 43).
The month with the least cloud cover is July (Cloud cover 12).
Average visibility in September
São Facundo, Portugal
- Average visibility in September: 9km
The month with the highest visibility is June (10km).
The month with the lowest visibility is January (8km).
