September weather forecast
Yalegoda, Sri Lanka

September

Weather in September

September, the first month of the autumn in Yalegoda, is also a moderately hot month, with an average temperature ranging between min 21.1°C (70°F) and max 29.5°C (85.1°F).

Temperature

The commencement of September notes an average high-temperature of a still warm 29.5°C (85.1°F), exhibiting little difference from the previous month. Nighttime temperatures hover around an average low of 21.1°C (70°F) in September.

Heat index

The average heat index in September is estimated at a fiery hot 35°C (95°F). Greater preventive actions are needed, heat exhaustion and heat cramps are likely. Persistent activity could provoke heatstroke.
One should consider that heat index numbers are for shaded settings and light wind. Direct sunlight can cause a surge in the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'felt air temperature', represents the fusion of temperature and moisture in the air to suggest how warm it feels. Factors including metabolic differences, physical activity, and clothing are additional elements that influence the individual's temperature experience. Should you be directly under the sun, anticipate a possible increase in the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values remain especially vital for babies and toddlers. Young kids are often more at risk than adults as they tend to perspire less. Besides, their skin surface is larger relative to their small bodies, and their increased heat output from their active lifestyle compounds their risk.
The human body has a built-in cooling mechanism through perspiration; evaporating sweat dissipates the excess heat. Higher relative humidity impedes evaporation, thus reducing heat dispersion from the body, culminating in a sensation of overheating. When heat uptake goes beyond the body's cooling mechanisms, there's a surge in body temperature, posing health risks.

Humidity

In Yalegoda, the average relative humidity in September is 77%.

Rainfall

In Yalegoda, in September, during 23.4 rainfall days, 118mm (4.65") of precipitation is typically accumulated. Throughout the year, there are 278.4 rainfall days, and 1466mm (57.72") of precipitation is accumulated.

Daylight

In Yalegoda, the average length of the day in September is 12h and 10min.
On the first day of the month, sunrise is at 05:59 and sunset at 18:15. On the last day of September, sunrise is at 05:55 and sunset at 17:59 +0530.

Sunshine

In September, the average sunshine is 10.3h.

UV index

January through September, November and December, with an average maximum UV index of 6, are months with the highest UV index. A UV Index estimate of 6 to 7 represents a high health risk from unsafe exposure to UV radiation for ordinary individuals.
Note: The maximum daily UV index of 6 in September interprets into the following recommendations:
Shun overexposure. Protection from sun ravages is indispensable. Attempt to stay under shade and limit exposure to the Sun between 10 a.m. and 4 p.m., when UV radiation is at its peak. Remember, devices such as parasols or canopies might not provide complete sun protection. Tightly woven clothing, when worn loosely, shields effectively against the Sun.

Frequently asked questions

Is it hot during September?
The high-temperature in Yalegoda, Sri Lanka, during September is 29.5°C (85.1°F) and the low-temperature is 21.1°C (70°F). In September, the average heat index (a.k.a. 'apparent temperature', 'real feel'), which combines relative humidity and air temperature, is estimated at 35°C (95°F).
What is the average humidity in September?
In September, the average relative humidity is 77%.
How many days does it rain in September?
In September, the rain falls for 23.4 days. Throughout September, 118mm (4.65") of precipitation is accumulated.
How many hours of daylight does Yalegoda have in September?
In Yalegoda, the average day length in September is 12h and 10min.
When are sunrise and sunset in September?
In September, on the first day of the month, sunrise is at 05:59 and sunset at 18:15. On the last day of the month, sunrise is at 05:55 and sunset at 17:59 +0530.
How many hours of sunshine does Yalegoda have in September?
In Yalegoda, the average sunshine duration in September is 10.3h.
What are the months with the highest UV index?
January through September, November and December, with an average maximum UV index of 6, are months with the highest UV index.
What is the UV index reading in September?
The average daily maximum UV index in September is 6. A UV Index value of 6 to 7 symbolizes a high health vulnerability from exposure to the Sun's UV radiation.
Average high temperature
Average low temperature
Average wind speed
Average max. wind speed
Average wind speed gusts
Average humidity
Average rainfall
Average rainfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility
Average temperature in September
Yalegoda, Sri Lanka
  • Average high temperature in September: 29.5°C

The warmest month (with the highest average high temperature) is March (31.5°C).
The month with the lowest average high temperature is December (27.5°C).

  • Average low temperature in September: 21.1°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 (18.1°C).

Average pressure in September
Yalegoda, Sri Lanka
  • Average pressure in September: 1009.3mbar

The month with the highest atmospheric pressure is January (1011.8mbar).
The month with the lowest atmospheric pressure is June (1008.1mbar).

Average wind speed in September
Yalegoda, Sri Lanka
  • Average wind speed in September: 10.8km/h

The windiest month (with the highest average wind speed) is June (13.5km/h).
The calmest month (with the lowest average wind speed) is April (4.7km/h).

Average humidity in September
Yalegoda, Sri Lanka
  • Average humidity in September: 77%

The month with the highest relative humidity is December (84%).
The month with the lowest relative humidity is March (74%).

Average rainfall in September
Yalegoda, Sri Lanka
  • Average rainfall in September: 118mm

The wettest month (with the highest rainfall) is October (301mm).
The driest month (with the least rainfall) is January (38mm).

Average rainfall days in September
Yalegoda, Sri Lanka
  • Average rainfall days in September: 23.4 days

The month with the highest number of rainy days is May (28.6 days).
The month with the least rainy days is January (14.1 days).

Average daylight in September /
Average sunshine in September
Yalegoda, 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: 10h and 48min).
The month with the least sunshine is December (Average sunshine: 5h and 42min).

Average sunshine days in September
Yalegoda, Sri Lanka
  • Average sunshine days in September: 3.9 days

The month with the most sunshine days is January (14.8 days).
The month with the least sunshine days is May (1.2 days).

Average UV index in September
Yalegoda, Sri Lanka
  • Average UV index in September: 6

The months with the highest UV index are January, February, March, April, May, June, July, August, September, November and December (UV index 6).
The month with the lowest UV index is October (UV index 5).

Average cloud cover in September
Yalegoda, Sri Lanka
  • Average cloud cover in September: 34

The months with the most cloud cover are November and December (Cloud cover 47).
The month with the least cloud cover is March (Cloud cover 27).

Average visibility in September
Yalegoda, Sri Lanka
  • Average visibility in September: 9km

The months with the highest visibility are June, July and August (10km).
The months with the lowest visibility are January, February, March, April, November and December (8km).

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