September weather forecast
Kossinna, Sri Lanka

September

Weather in September

The first month of the autumn, September, is also a moderately hot month in Kossinna, Sri Lanka, with an average temperature varying between 29.5°C (85.1°F) and 21.1°C (70°F).

Temperature

September brings an average high-temperature of a still warm 29.5°C (85.1°F), nearly identical to the preceding month. During the month of September, the temperature falls to an average of 21.1°C (70°F).

Heat index

For September, the heat index is calculated to be a torrid 35°C (95°F). Heightened safety actions are necessary, heat cramps and heat exhaustion are probable. Persistent activity may lead to heatstroke.
Factoring in the heat index, values are geared towards shaded areas with light breezes. Exposing to direct sunshine may enhance heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'real feel', is an amalgamation of air temperature and humidity to express the equivalent perceived temperature. The impression of weather on a person can be swayed by additional aspects, including metabolic variations, pregnancy, and activity levels. Consider the fact that direct sun exposure can influence how hot one feels, potentially raising the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Young ones often disregard the necessity to rest and hydrate. Thirst usually indicates advanced dehydration - hence, it is key to stay hydrated, particularly during ongoing physical activities.
The human body cools itself through perspiration, as excessive warmth is removed from the body through sweat evaporation. Under conditions of increased relative humidity, the evaporation rate lessens, causing the body to retain more heat than under less humid conditions. Heat absorption that surpasses the body's shedding capability can lead to overheating and varying levels of dehydration.

Humidity

In September, the average relative humidity is 77%.

Rainfall

In Kossinna, Sri Lanka, 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 September, the average length of the day is 12h and 10min.
On the first day of the month, sunrise is at 06:00 and sunset at 18:15. On the last day of September, sunrise is at 05:56 and sunset at 18:00 +0530.

Sunshine

The average sunshine in September 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 of 6 to 7 symbolizes a high health vulnerability from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: In September, the maximum UV index of 6 transforms into these recommendations:
Guard against overexposure. Protection from sun-induced harm is essential. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. Arm yourself against UV rays' harm with protective apparel and UV-filtering shades.

Frequently asked questions

How hot does it get in September?
The high-temperature, in September, in Kossinna, is 29.5°C (85.1°F), while the low-temperature averages to 21.1°C (70°F). The average heat index (a.k.a. 'real feel', 'apparent temperature'), which factors the actual air temperature with the relative humidity, in September is calculated to be 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 Kossinna?
In Kossinna, in September, it is raining for 23.4 days, with typically 118mm (4.65") of accumulated precipitation.
How many hours of daylight does Kossinna have in September?
The average day length in September is 12h and 10min.
What time are sunrise and sunset in September in Kossinna?
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 18:00 +0530.
How many hours of sunshine does Kossinna have in September?
In September, the average sunshine duration is 10.3h.
What are the months with the highest UV index?
The months with the highest UV index are January through September, November and December, with an average maximum UV index of 6.
What is the UV index reading in September?
The average daily maximum UV index in September is 6. A UV Index reading of 6 to 7 represents a high health risk from unsafe exposure to Sun's UV rays.
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 - Kossinna, Sri Lanka
Average temperature in September
Kossinna, 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 - Kossinna, Sri Lanka
Average pressure in September
Kossinna, 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 - Kossinna, Sri Lanka
Average wind speed in September
Kossinna, 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 - Kossinna, Sri Lanka
Average humidity in September
Kossinna, 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 - Kossinna, Sri Lanka
Average rainfall in September
Kossinna, 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 - Kossinna, Sri Lanka
Average rainfall days in September
Kossinna, 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 - Kossinna, Sri Lanka
Average daylight in September /
Average sunshine in September
Kossinna, 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 - Kossinna, Sri Lanka
Average sunshine days in September
Kossinna, 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 - Kossinna, Sri Lanka
Average UV index in September
Kossinna, 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 - Kossinna, Sri Lanka
Average cloud cover in September
Kossinna, 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 - Kossinna, Sri Lanka
Average visibility in September
Kossinna, 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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