September weather forecastSanto Tomé, Spain
September
Weather in September
September, the first month of the autumn in Santo Tomé, is still a warm month, with an average temperature varying between 17.2°C (63°F) and 29.4°C (84.9°F).Temperature
As September begins, there is a decrease in the average high-temperature, falling from a fiery hot 35.3°C (95.5°F) in August to a moderately hot 29.4°C (84.9°F). Despite drastic daytime highs, Santo Tomé logs an average low-temperature reading of 17.2°C (63°F) throughout September.Heat index
In September, the average heat index is estimated at 29°C (84.2°F). A sense of exhaustion might occur with extended exposure and activity, potentially causing heat cramps.It is important to note that the heat index values are for shaded areas and light wind scenarios. Direct sunlight can cause a surge in the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'feels like', is the result of factoring in humidity to the air temperature, indicating perceived warmth. One's weather perception can be influenced by a range of factors including metabolic differences, being pregnant, and their level of physical activity. Sunshine, when direct, has the potential to intensify weather effects, leading to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values hold particular significance for children. Youngsters generally face more threats than adults given their lesser ability to sweat. Coupled with their larger skin surface relative to their small bodies and higher heat production due to their activities, they are more endangered.
Humidity
In Santo Tomé, Spain, the average relative humidity in September is 43%.Rainfall
In Santo Tomé, in September, during 4.9 rainfall days, 12mm (0.47") of precipitation is typically accumulated. Throughout the year, there are 97 rainfall days, and 282mm (11.1") of precipitation is accumulated.Snowfall
April through December are months without snowfall in Santo Tomé.Daylight
The average length of the day in September in Santo Tomé, Spain, is 12h and 26min.On the first day of the month, sunrise is at 07:42 and sunset at 20:41. On the last day of September, sunrise is at 08:07 and sunset at 19:56 CEST.
Sunshine
The average sunshine in September is 9.6h.UV index
The average daily maximum UV index in September in Santo Tomé is 5. A UV Index reading of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV rays for the average person.Note: The maximum daily UV index of 5 in September interprets into the following recommendations:
Prioritize safety - Suggestions to prevent sun damage are offered. The mid-day Sun emits the most powerful UV radiation, so seek shade and minimize exposure. On sunny days, it's ideal to wear sunglasses that filter out UVA and UVB rays.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Santo Tomé, Spain
- Average high temperature in September: 29.4°C
The warmest months (with the highest average high temperature) are July and August (35.3°C).
The month with the lowest average high temperature is January (12.2°C).
- Average low temperature in September: 17.2°C
The month with the highest average low temperature is August (21.3°C).
The coldest month (with the lowest average low temperature) is January (3.3°C).
Average pressure in September
Santo Tomé, Spain
- Average pressure in September: 1016.9mbar
The month with the highest atmospheric pressure is December (1023mbar).
The month with the lowest atmospheric pressure is April (1015mbar).
Average wind speed in September
Santo Tomé, Spain
- Average wind speed in September: 6.6km/h
The windiest month (with the highest average wind speed) is March (9.3km/h).
The calmest month (with the lowest average wind speed) is October (6.4km/h).
Average humidity in September
Santo Tomé, Spain
- Average humidity in September: 43%
The month with the highest relative humidity is January (75%).
The month with the lowest relative humidity is July (31%).
Average rainfall in September
Santo Tomé, Spain
- Average rainfall in September: 12mm
The wettest month (with the highest rainfall) is November (49mm).
The driest month (with the least rainfall) is July (2mm).
Average rainfall days in September
Santo Tomé, Spain
- Average rainfall days in September: 4.9 days
The month with the highest number of rainy days is March (13.9 days).
The month with the least rainy days is August (2.2 days).
Average snowfall in September
Santo Tomé, Spain
- Average snowfall in September: 0mm
The month with the highest snowfall is February (3mm).
The months with the least snowfall are April, May, June, July, August, September, October, November and December (0mm).
Average snowfall days in September
Santo Tomé, Spain
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (0.7 days).
The months with the least snowfall days are April, May, June, July, August, September, October and November (0 days).
Average daylight in September /
Average sunshine in September
Santo Tomé, Spain
- Average daylight in September: 12h and 24min
The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 36min).
- Average sunshine in September: 9h and 36min
The month with the most sunshine is June (Average sunshine: 11h and 54min).
The month with the least sunshine is December (Average sunshine: 6h and 42min).
Average sunshine days in September
Santo Tomé, Spain
- Average sunshine days in September: 23.5 days
The month with the most sunshine days is July (27.7 days).
The month with the least sunshine days is April (13.9 days).
Average UV index in September
Santo Tomé, Spain
- Average UV index in September: 5
The months with the highest UV index are June, July and August (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 3).
Average cloud cover in September
Santo Tomé, Spain
- Average cloud cover in September: 13
The month with the most cloud cover is January (Cloud cover 37).
The months with the least cloud cover are July and August (Cloud cover 6).
Average visibility in September
Santo Tomé, Spain
- Average visibility in September: 10km
The months with the highest visibility are May, June, July, August, September, October and December (10km).
The months with the lowest visibility are January, February, March, April and November (9km).
