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 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
Weather in September
Temperature
A minor adjustment in Santarem's average high-temperature is noted with the start of September, touching a warm 28.6°C (83.5°F) from August's 31°C (87.8°F). Santarem's September nights bring a significant temperature shift, averaging at a moderate 15.2°C (59.4°F).Heat index
In September, the average heat index is computed to be a hot 31°C (87.8°F). If one continues to be active during enduring exposure, it could result in fatigue and heat cramps.In the scope of the heat index, its values resonate with shade and light wind conditions. Direct exposure to sunlight could raise the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'apparent temperature', evaluates the perceived heat by adding the effect of moisture in the air. The individual's temperature perception can be influenced by numerous factors such as metabolic variations, physical activity, and clothing. When directly under the sun, the weather's impact can intensify, possibly boosting the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values hold great significance to children. 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
In September, the average relative humidity in Santarem is 63%.Rainfall
In Santarem, during September, the rain falls for 5.7 days and regularly aggregates up to 19mm (0.75") of precipitation. In Santarem, during the entire year, the rain falls for 108.1 days and collects up to 337mm (13.27") of precipitation.Daylight
The average length of the day in September is 12h and 26min.On the first day of September, sunrise is at 07:03 and sunset at 20:05. On the last day of the month, sunrise is at 07:30 and sunset at 19:18 WEST.
Sunshine
The average sunshine in September in Santarem is 9.3h.UV index
In September, the average daily maximum UV index in Santarem is 5. A UV Index of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV rays for the ordinary person.Note: In September, the maximum UV index of 5 transforms into these recommendations:
Guard yourself - Avoiding sunburn is suggested. The intensity of the Sun's UV radiation during midday suggests reducing time spent outdoors. Fend off the sun's harsh rays with appropriate clothing, a wide-brim hat, and UV-protective sunglasses.
Frequently asked questions
How hot is September in Santarem?
What is the average humidity in September in Santarem?
How many days does it rain in September in Santarem?
What is the average length of the day in September in Santarem?
When is the sunrise / sunset in September in Santarem?
How long on average sun shines in September in Santarem?
What is the UV index reading in September in Santarem?
Average temperature in September
Santarem, Portugal
- Average high temperature in September: 28.6°C
The warmest month (with the highest average high temperature) is August (31°C).
The month with the lowest average high temperature is January (14°C).
- Average low temperature in September: 15.2°C
The month with the highest average low temperature is July (15.8°C).
The coldest months (with the lowest average low temperature) are January and February (6.8°C).
Average pressure in September
Santarem, Portugal
- Average pressure in September: 1016.7mbar
The month with the highest atmospheric pressure is December (1022.6mbar).
The month with the lowest atmospheric pressure is April (1015.5mbar).
Average wind speed in September
Santarem, Portugal
- Average wind speed in September: 10.6km/h
The windiest month (with the highest average wind speed) is July (13.2km/h).
The calmest months (with the lowest average wind speed) are September and October (10.6km/h).
Average humidity in September
Santarem, Portugal
- Average humidity in September: 63%
The month with the highest relative humidity is January (81%).
The month with the lowest relative humidity is August (62%).
Average rainfall in September
Santarem, Portugal
- Average rainfall in September: 19mm
The wettest month (with the highest rainfall) is November (53mm).
The driest months (with the least rainfall) are July and August (3mm).
Average rainfall days in September
Santarem, Portugal
- Average rainfall days in September: 5.7 days
The month with the highest number of rainy days is November (13.9 days).
The month with the least rainy days is August (2.4 days).
Average daylight in September /
Average sunshine in September
Santarem, Portugal
- Average daylight in September: 12h and 2min
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 2min
The month with the most sunshine is July (Average sunshine: 11h and 12min).
The month with the least sunshine is January (Average sunshine: 5h and 12min).
Average sunshine days in September
Santarem, Portugal
- Average sunshine days in September: 23.3 days
The month with the most sunshine days is July (27.3 days).
The months with the least sunshine days are April and November (14.6 days).
Average UV index in September
Santarem, Portugal
- Average UV index in September: 5
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 3).
Average cloud cover in September
Santarem, Portugal
- Average cloud cover in September: 21
The month with the most cloud cover is January (Cloud cover 42).
The month with the least cloud cover is August (Cloud cover 17).
Average visibility in September
Santarem, Portugal
- Average visibility in September: 9km
The month with the highest visibility is June (10km).
The months with the lowest visibility are January, February, March, April, May, July, August, September, October, November and December (9km).
Santarem, Portugal
Weather forecast for your location
2. Allow the app to use your location