September weather forecastDandugama, Sri Lanka
September
Weather in September
September, the first month of the autumn in Dandugama, is still a warm month, with an average temperature ranging between min 25.2°C (77.4°F) and max 29.5°C (85.1°F).Temperature
During September, Dandugama records an average high-temperature of a still moderately hot 29.5°C (85.1°F), marking a slight divergence from August's 29.3°C (84.7°F). September nights in Dandugama, Sri Lanka, witness a slight temperature decrease, averaging at a still moderately hot 25.2°C (77.4°F).Heat index
September's average heat index is estimated at a torrid 36°C (96.8°F). Apply extra caution, heat cramps and heat exhaustion could happen. Heatstroke might occur with long-duration activity.Heat index determinations are made taking into account the shade and light air movements. Direct exposure to sunlight could raise the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'feels like', is a value derived by merging air temperature with the humidity to convey how the climate feels. The influence of weather can be personal, changing with an individual's body mass, height, and level of physical exertion. Keep it in mind, direct sunlight can augment the heat you experience, possibly pushing the heat index up by 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical for babies and toddlers. Young ones are generally more prone to risk than adults due to their reduced ability to sweat. Their large skin surface area relative to their diminutive bodies and elevated heat production from their activities further enhance this risk.
To cool down, the human body relies on perspiration, a process where excessive heat is eliminated as sweat evaporates. During conditions of high air temperature and humidity (high heat index), the body's ability to perspire is inhibited, increasing the sensation of warmth. Inadequate heat shedding in the face of rising body temperatures hints at potential dehydration risks.
Humidity
In September, the average relative humidity is 81%.Rainfall
In Dandugama, in September, it is raining for 24.4 days, with typically 153mm (6.02") of accumulated precipitation. In Dandugama, during the entire year, the rain falls for 265.4 days and collects up to 1744mm (68.66") of precipitation.Daylight
In September, the average length of the day is 12h and 10min.On the first day of September in Dandugama, sunrise is at 06:02 and sunset at 18:17. On the last day of the month, sunrise is at 05:58 and sunset at 18:02 +0530.
Sunshine
The average sunshine in September in Dandugama is 7.7h.UV index
The months with the highest UV index in Dandugama are January through April, July, September, November and December, with an average maximum UV index of 7. A UV Index reading of 6 to 7 represents a high threat to health from exposure to the Sun's UV rays for the average person.Note: In September, a regular UV index of 7 translates into these guidelines:
Sustain precautions and conform to sun safety norms. Preventing sunburn is necessary. To the best of your ability, limit your exposure to the sun between the hours of 10 a.m. and 4 p.m., when UV radiation is at its peak. 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
Dandugama, Sri Lanka
- Average high temperature in September: 29.5°C
The warmest month (with the highest average high temperature) is March (32.1°C).
The month with the lowest average high temperature is July (29.2°C).
- Average low temperature in September: 25.2°C
The month with the highest average low temperature is May (26.4°C).
The coldest month (with the lowest average low temperature) is January (22.8°C).
Average pressure in September
Dandugama, Sri Lanka
- Average pressure in September: 1009.6mbar
The month with the highest atmospheric pressure is January (1011.7mbar).
The months with the lowest atmospheric pressure are May and June (1008.4mbar).
Average wind speed in September
Dandugama, Sri Lanka
- Average wind speed in September: 16km/h
The windiest month (with the highest average wind speed) is June (18.3km/h).
The calmest month (with the lowest average wind speed) is March (9.1km/h).
Average humidity in September
Dandugama, Sri Lanka
- Average humidity in September: 81%
The months with the highest relative humidity are June, July and August (82%).
The months with the lowest relative humidity are January and February (73%).
Average rainfall in September
Dandugama, Sri Lanka
- Average rainfall in September: 153mm
The wettest month (with the highest rainfall) is June (231mm).
The driest month (with the least rainfall) is January (29mm).
Average rainfall days in September
Dandugama, Sri Lanka
- Average rainfall days in September: 24.4 days
The month with the highest number of rainy days is August (28.4 days).
The month with the least rainy days is January (9.7 days).
Average daylight in September /
Average sunshine in September
Dandugama, Sri Lanka
- Average daylight in September: 12h and 12min
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 42min
The months with the most sunshine are January, February, March and April (Average sunshine: 9h and 12min).
The month with the least sunshine is November (Average sunshine: 6h and 36min).
Average sunshine days in September
Dandugama, Sri Lanka
- Average sunshine days in September: 3 days
The month with the most sunshine days is January (20 days).
The month with the least sunshine days is August (1.2 days).
Average UV index in September
Dandugama, Sri Lanka
- Average UV index in September: 7
The months with the highest UV index are January, February, March, April, July, September, November and December (UV index 7).
The months with the lowest UV index are May, June, August and October (UV index 6).
Average cloud cover in September
Dandugama, Sri Lanka
- Average cloud cover in September: 55
The month with the most cloud cover is June (Cloud cover 57).
The month with the least cloud cover is January (Cloud cover 21).
Average visibility in September
Dandugama, Sri Lanka
- Average visibility in September: 10km
The months with the highest visibility are January, February, March, April, June, July, September and December (10km).
The months with the lowest visibility are May, August, October and November (9km).
