September weather forecast
Kirindiwela, Sri Lanka

September

Weather in September

The first month of the autumn, September, is still a warm month in Kirindiwela, Sri Lanka, with an average temperature varying between 29.1°C (84.4°F) and 24.9°C (76.8°F).

Temperature

The arrival of September brings an average high-temperature of a still moderately hot 29.1°C (84.4°F), nearly identical to August's 28.9°C (84°F). Kirindiwela, in September, logs an average low-temperature of 24.9°C (76.8°F), a subtle step down from daytime readings.

Heat index

September's mean heat index is estimated at a sweltering 35°C (95°F). Take special precautions - heat exhaustion and heat cramps are expected. Heatstroke may occur with lengthy activity.
Note that heat index values are valued for light wind and location in the shade. The heat index values could be amplified by up to 15 Fahrenheit (8 Celsius) degrees in direct sunlight.
Note: The heat index, also known as 'felt air temperature' or 'real feel', ties air temperature with relative humidity to produce the perceived temperature sensation. Elements such as metabolic variations, pregnancy, and physical exertion can influence one's weather perception. Being under direct sunshine can magnify the heat experience, possibly pushing up the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are largely significant for babies and toddlers. Children usually face more risks than adults as their ability to sweat is less. Additionally, their larger skin surface in relation to their petite bodies and higher heat output due to their activities increases their vulnerability.
When the body gets too warm, it perspires, leading to sweat evaporation which cools it down. An increase in relative humidity hinders the body's normal cooling function by reducing evaporation, thereby decreasing the rate of body cooling and enhancing the sense of warmth. When the body's heat gain surpasses its removal capacity, body temperature starts to climb, leading to potential heat-related ailments.

Humidity

In September, the average relative humidity in Kirindiwela, Sri Lanka, is 81%.

Rainfall

In Kirindiwela, during September, the rain falls for 26.9 days and regularly aggregates up to 206mm (8.11") of precipitation. Throughout the year, there are 289.4 rainfall days, and 2262mm (89.06") 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 06:01 and sunset at 18:16. On the last day of September, sunrise is at 05:57 and sunset at 18:01 +0530.

Sunshine

In Kirindiwela, Sri Lanka, the average sunshine in September is 7.4h.

UV index

January through April, July, September, November and December, with an average maximum UV index of 7, are months with the highest UV index in Kirindiwela, Sri Lanka. A UV Index of 6 to 7 symbolizes a high threat to health from unsafe exposure to UV radiation for the ordinary person.
Note: The maximum UV index of 7 during September leads to these instructions:
Implement precautions and maintain sun safety methods. Avoidance of sunburn is demanded. Stay in the shade and avoid direct Sun exposure from 10 a.m. to 4 p.m., a time when UV radiation is at its strongest, and remember that parasols or canopies do not offer full protection. Prioritize a wide-brim hat for comprehensive sun defense for your face, neck, eyes, and ears.

Frequently asked questions

How hot is it in Kirindiwela in September?
In Kirindiwela, in September, the average high-temperature is 29.1°C (84.4°F), and the average low-temperature is 24.9°C (76.8°F). The average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which combines relative humidity and air temperature, in September is estimated at 35°C (95°F).
What is the average humidity in September in Kirindiwela?
The average relative humidity in September in Kirindiwela, Sri Lanka, is 81%.
How many days does it rain in September in Kirindiwela?
In Kirindiwela, Sri Lanka, in September, during 26.9 rainfall days, 206mm (8.11") of precipitation is typically accumulated.
What is the average length of the day in September in Kirindiwela?
In September, the average day length is 12h and 10min.
When is the sunrise / sunset in September in Kirindiwela?
On the first day of September, sunrise is at 06:01 and sunset at 18:16. On the last day of the month, sunrise is at 05:57 and sunset at 18:01 +0530.
How many hours of sunshine does Kirindiwela have in September?
The average sunshine duration in September in Kirindiwela is 7.4h.
What are the months with the highest UV index in Kirindiwela?
The months with the highest UV index in Kirindiwela, Sri Lanka, are January through April, July, September, November and December, with an average maximum UV index of 7.
How high is the UV index in September in Kirindiwela?
The average daily maximum UV index in September in Kirindiwela, Sri Lanka, is 7. A UV Index of 6 to 7 symbolizes a high health vulnerability 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
Kirindiwela, Sri Lanka
  • Average high temperature in September: 29.1°C

The warmest months (with the highest average high temperature) are March and April (31.8°C).
The months with the lowest average high temperature are July and August (28.9°C).

  • Average low temperature in September: 24.9°C

The month with the highest average low temperature is May (26.3°C).
The coldest month (with the lowest average low temperature) is January (23.1°C).

Average pressure in September
Kirindiwela, Sri Lanka
  • Average pressure in September: 1009.8mbar

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
Kirindiwela, Sri Lanka
  • Average wind speed in September: 13.2km/h

The windiest month (with the highest average wind speed) is June (15.1km/h).
The calmest month (with the lowest average wind speed) is March (8km/h).

Average humidity in September
Kirindiwela, Sri Lanka
  • Average humidity in September: 81%

The months with the highest relative humidity are June, July and August (83%).
The months with the lowest relative humidity are January and February (74%).

Average rainfall in September
Kirindiwela, Sri Lanka
  • Average rainfall in September: 206mm

The wettest month (with the highest rainfall) is June (341mm).
The driest month (with the least rainfall) is January (40mm).

Average rainfall days in September
Kirindiwela, Sri Lanka
  • Average rainfall days in September: 26.9 days

The month with the highest number of rainy days is August (30.2 days).
The month with the least rainy days is January (11.6 days).

Average daylight in September /
Average sunshine in September
Kirindiwela, 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 January (Average sunshine: 9h and 6min).
The month with the least sunshine is November (Average sunshine: 6h and 42min).

Average sunshine days in September
Kirindiwela, Sri Lanka
  • Average sunshine days in September: 1.5 days

The month with the most sunshine days is January (17.2 days).
The months with the least sunshine days are June and August (0.3 days).

Average UV index in September
Kirindiwela, 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
Kirindiwela, 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 24).

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

The months with the highest visibility are January, February, March, April and December (10km).
The months with the lowest visibility are May, June, July, August, September, October and November (9km).

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