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 introduction of September brings an average high temperature of a still warm 27.5°C (81.5°F), mirroring the readings of the previous month. September nights are marked by an average temperature drop to a pleasant 20.8°C (69.4°F).Heat index
September's heat index is computed to be a hot 32°C (89.6°F). If one persists in activity during exposure, it could induce weariness and subsequently, heat cramps.In the scope of the heat index, its values resonate with shade and light wind conditions. Direct sunlight might lead to a heat index increase by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'apparent temperature', is what the temperature feels like to the human body when the air temperature is combined with the relative humidity. Additional elements encompassing metabolic differences, the degree of physical activity, and attire can impact the individual's perception of temperature. It is noteworthy that being in direct sunlight can enhance the weather's impact, raising the heat index by as much as 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely significant for children. In general, children are more at risk than adults because they sweat less. Furthermore, the large skin surface compared to their small bodies and the high heat production due to their actions contribute to this vulnerability.
Humidity
In Udakanda, the average relative humidity in September is 86%.Rainfall
In September, the rain falls for 26.2 days. Throughout September, 223mm (8.78") of precipitation is accumulated. Throughout the year, there are 317.7 rainfall days, and 2467mm (97.13") of precipitation is accumulated.Daylight
The average length of the day in September is 12h and 10min.On the first day of September, sunrise is at 05:59 and sunset at 18:14. On the last day of the month, sunrise is at 05:55 and sunset at 17:59 +0530.
Sunshine
The average sunshine in September is 7.3h.UV index
The months with the lowest UV index are September and October, with an average maximum UV index of 5. A UV Index value of 3 to 5 symbolizes a medium health hazard from unsafe exposure to UV radiation for ordinary individuals.Note: In September, the UV index of 5 transforms into the following advice:
Be vigilant - Suggestions to stave off sun damage are provided. To prevent harmful UV exposure, minimize direct contact with the Sun around midday. In bright sunlight, prioritize sunglasses that grant protection from UVA and UVB radiation.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in September?
What is the average humidity in September?
How many days does it rain in September?
How many hours of daylight does Udakanda have in September?
When is the sunrise / sunset in September?
How long on average sun shines in September?
What are the months with the lowest UV index?
What is the UV index reading in September?
Average temperature in September
Udakanda, Sri Lanka
- Average high temperature in September: 27.5°C
The warmest month (with the highest average high temperature) is March (31.1°C).
The months with the lowest average high temperature are June and July (27.3°C).
- Average low temperature in September: 20.8°C
The months with the highest average low temperature are May and June (21.8°C).
The coldest month (with the lowest average low temperature) is February (18.7°C).
Average pressure in September
Udakanda, Sri Lanka
- Average pressure in September: 1009.7mbar
The month with the highest atmospheric pressure is January (1011.6mbar).
The month with the lowest atmospheric pressure is May (1008.6mbar).
Average wind speed in September
Udakanda, Sri Lanka
- Average wind speed in September: 7.3km/h
The windiest month (with the highest average wind speed) is July (8.8km/h).
The calmest months (with the lowest average wind speed) are February and March (3.9km/h).
Average humidity in September
Udakanda, Sri Lanka
- Average humidity in September: 86%
The months with the highest relative humidity are May and June (88%).
The months with the lowest relative humidity are January and February (80%).
Average rainfall in September
Udakanda, Sri Lanka
- Average rainfall in September: 223mm
The wettest month (with the highest rainfall) is October (357mm).
The driest month (with the least rainfall) is January (85mm).
Average rainfall days in September
Udakanda, Sri Lanka
- Average rainfall days in September: 26.2 days
The month with the highest number of rainy days is May (29.8 days).
The month with the least rainy days is January (18.9 days).
Average daylight in September /
Average sunshine in September
Udakanda, 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: 7h and 2min
The month with the most sunshine is April (Average sunshine: 8h and 24min).
The month with the least sunshine is December (Average sunshine: 6h and 0min).
Average sunshine days in September
Udakanda, Sri Lanka
- Average sunshine days in September: 1.3 days
The month with the most sunshine days is January (9.2 days).
The month with the least sunshine days is April (0.2 days).
Average UV index in September
Udakanda, Sri Lanka
- Average UV index in September: 5
The months with the highest UV index are January, February, March, April, May, June, July, August, November and December (UV index 6).
The months with the lowest UV index are September and October (UV index 5).
Average cloud cover in September
Udakanda, Sri Lanka
- Average cloud cover in September: 60
The month with the most cloud cover is June (Cloud cover 65).
The month with the least cloud cover is January (Cloud cover 33).
Average visibility in September
Udakanda, Sri Lanka
- Average visibility in September: 7km
The months with the highest visibility are January, February, March, June, July, August and December (8km).
The months with the lowest visibility are April, May, September, October and November (7km).
