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
September
Weather in September
Temperature
The advent of September signifies a minor shift to an average high-temperature of a still tropical 31°C (87.8°F), aligning closely with August. Throughout September, Mawathagama witnesses a consistent average low-temperature of 22.2°C (72°F).Heat index
September's mean heat index is appraised at a fiery hot 39°C (102.2°F). Ensure extra safety steps, heat exhaustion and heat cramps are likely. Long activity might lead to heatstroke.In the scope of the heat index, its values resonate with shade and light wind conditions. Facing direct sunlight may hike up the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'real feel', quantifies the warmth felt when relative humidity is considered. This impact is subjective, influenced by the person's physical activity and individual heat perception, affected by factors including wind, attire, and metabolic differences. Awareness is key; direct sunlight can enhance the weather's impact, possibly boosting the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Young individuals are generally in more danger than adults due to their lower capacity to sweat. Moreover, their large skin surface in relation to their small bodies and the increased heat generation from their activities makes them more vulnerable.
Perspiring is a crucial mechanism for the human body, allowing it to release excessive warmth through evaporating sweat. During high air temperature and humidity (high heat index), the process of perspiration is hindered, intensifying the sensation of heat. Potential thermal conditions emerge as the body's heat gain outpaces its cooling mechanisms.
Humidity
In Mawathagama, the average relative humidity in September is 73%.Rainfall
In September, the rain falls for 16.3 days. Throughout September, 82mm (3.23") of precipitation is accumulated. In Mawathagama, Sri Lanka, during the entire year, the rain falls for 218.8 days and collects up to 1175mm (46.26") of precipitation.Daylight
The average length of the day in September is 12h and 10min.On the first day of September, sunrise is at 06:00 and sunset at 18:15. On the last day of the month, sunrise is at 05:56 and sunset at 17:59 +0530.
Sunshine
In September, the average sunshine is 10.3h.UV index
March through September, with an average maximum UV index of 7, are months with the highest UV index. A UV Index of 6 to 7 symbolizes a high threat to health from exposure to the Sun's UV radiation for the average person.Note: A maximum high UV index of 7 in September translates into the following recommendations:
Avert overexposure. Light-skinned people might experience burning in less than 20 minutes. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim.
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?
How many days does it rain in September?
What is the average length of the day in September?
When is the sunrise / sunset in September?
How many hours of sunshine does Mawathagama have in September?
What is the month with the highest UV index?
How high is the UV index in September?
Average temperature in September
Mawathagama, Sri Lanka
- Average high temperature in September: 31°C
The warmest month (with the highest average high temperature) is April (32.9°C).
The month with the lowest average high temperature is December (28.6°C).
- Average low temperature in September: 22.2°C
The month with the highest average low temperature is May (23°C).
The coldest month (with the lowest average low temperature) is February (18.9°C).
Average pressure in September
Mawathagama, Sri Lanka
- Average pressure in September: 1009.1mbar
The month with the highest atmospheric pressure is January (1011.9mbar).
The month with the lowest atmospheric pressure is June (1007.9mbar).
Average wind speed in September
Mawathagama, Sri Lanka
- Average wind speed in September: 12.9km/h
The windiest month (with the highest average wind speed) is June (16.5km/h).
The calmest month (with the lowest average wind speed) is April (5.6km/h).
Average humidity in September
Mawathagama, Sri Lanka
- Average humidity in September: 73%
The month with the highest relative humidity is December (83%).
The month with the lowest relative humidity is March (72%).
Average rainfall in September
Mawathagama, Sri Lanka
- Average rainfall in September: 82mm
The wettest month (with the highest rainfall) is October (267mm).
The driest month (with the least rainfall) is June (29mm).
Average rainfall days in September
Mawathagama, Sri Lanka
- Average rainfall days in September: 16.3 days
The month with the highest number of rainy days is April (24.7 days).
The month with the least rainy days is February (11.8 days).
Average daylight in September /
Average sunshine in September
Mawathagama, Sri Lanka
- Average daylight in September: 12h and 1min
The month with the longest days is June (Average daylight: 12h and 30min).
The month with the shortest days is December (Average daylight: 11h and 42min).
- Average sunshine in September: 10h and 2min
The month with the most sunshine is June (Average sunshine: 11h and 0min).
The month with the least sunshine is December (Average sunshine: 5h and 42min).
Average sunshine days in September
Mawathagama, Sri Lanka
- Average sunshine days in September: 9.7 days
The month with the most sunshine days is January (14.8 days).
The month with the least sunshine days is April (4 days).
Average UV index in September
Mawathagama, Sri Lanka
- Average UV index in September: 7
The months with the highest UV index are March, April, May, June, July, August and September (UV index 7).
The months with the lowest UV index are January, February, October, November and December (UV index 6).
Average cloud cover in September
Mawathagama, Sri Lanka
- Average cloud cover in September: 33
The months with the most cloud cover are November and December (Cloud cover 46).
The month with the least cloud cover is March (Cloud cover 24).
Average visibility in September
Mawathagama, Sri Lanka
- Average visibility in September: 10km
The months with the highest visibility are June, July, August and September (10km).
The months with the lowest visibility are January, November and December (8km).
