September weather forecast
Kaduwela, Sri Lanka

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Weather in September

The tail end of the monsoon season appears in September in Kaduwela, with a sharp decline in rainfall from 287mm (11.3") in August to 206mm (8.11"). Despite the receding showers, the weather continues to be predominantly wet and cloudy. The slightly cooler days mark the onset of the post-monsoon season. As September progresses, the transformation in weather conditions accrues at a steady pace. This gives the month a unique edge by "ushering out" the monsoon season.

Temperature

As Kaduwela steps into September, the average high-temperature is measured at a still moderately hot 29.1°C (84.4°F), displaying minor differences from August's 28.9°C (84°F). September nights reveal a minor deviation from daytime highs, with a mean low-temperature of 24.9°C (76.8°F).

Heat index

Throughout September, the heat index is calculated to be a very hot 35°C (95°F). Exercise more precautions, heat cramps and heat exhaustion are potential risks. Continuous activity could precipitate heatstroke.
Know that the heat index computations account for shaded terrains and slight winds. Direct sunlight has the potential to heighten heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'real feel', gives a temperature feeling by integrating air temperature and humidity. Physical activity, clothing, and metabolic variations are additional factors that impact an individual's perception of temperature. With direct sunlight, be aware that it might enhance the heat sensation, raising the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely 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.
Humans rely on perspiration as a cooling mechanism, wherein the evaporating sweat counteracts excessive warmth. When the level of relative humidity is elevated, evaporation diminishes, causing more warmth to be retained in the body than in dry air. Rising body temperatures due to excess heat retention could signify impending heat disorders.

Humidity

In Kaduwela, the average relative humidity in September is 81%.

Rainfall

In Kaduwela, in September, during 26.9 rainfall days, 206mm (8.11") of precipitation is typically accumulated. In Kaduwela, during the entire year, the rain falls for 289.4 days and collects up to 2262mm (89.06") of precipitation.

Daylight

The average length of the day in September is 12h and 10min.
On the first day of the month, sunrise is at 06:02 and sunset at 18:17. On the last day of September, sunrise is at 05:57 and sunset at 18:01 +0530.

Sunshine

In September, the average sunshine 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 Kaduwela. A UV Index reading of 6 to 7 represents a high health hazard from exposure to the Sun's UV rays for the average person.
Note: In September, the UV index of 7 transforms into the following advice:
Beware of overexposure. Fair-skinned individuals risk burning in less than 20 minutes. 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. For effective sun eye protection, rely on sunglasses certified for UVA and UVB resistance.

Frequently asked questions

How hot is September?

The high-temperature, in September, in Kaduwela, is 29.1°C (84.4°F), while the low-temperature averages to 24.9°C (76.8°F). The average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which combines air temperature and relative humidity, in September is calculated to be 35°C (95°F).

What is the average humidity in September?

In Kaduwela, the average relative humidity in September is 81%.

How many days does it rain in September?

In Kaduwela, 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?

The average day length in September in Kaduwela is 12h and 10min.

When is the sunrise / sunset in September?

On the first day of September in Kaduwela, sunrise is at 06:02 and sunset at 18:17. On the last day of the month, sunrise is at 05:57 and sunset at 18:01 +0530.

How long on average sun shines in September in Kaduwela?

The average sunshine duration in September is 7.4h.

When is the highest UV index in Kaduwela?

The months with the highest UV index 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 September, the average daily maximum UV index is 7. A UV Index estimate of 6 to 7 represents a high health threat from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Kaduwela, Sri Lanka

Average temperature in September - Kaduwela, 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
Kaduwela, Sri Lanka

Average pressure in September - Kaduwela, 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
Kaduwela, Sri Lanka

Average wind speed in September - Kaduwela, 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
Kaduwela, Sri Lanka

Average humidity in September - Kaduwela, 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
Kaduwela, Sri Lanka

Average rainfall in September - Kaduwela, 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
Kaduwela, Sri Lanka

Average rainfall days in September - Kaduwela, 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
Kaduwela, Sri Lanka

Average daylight in September / Average sunshine in September - Kaduwela, 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
Kaduwela, Sri Lanka

Average sunshine days in September - Kaduwela, 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
Kaduwela, Sri Lanka

Average UV index in September - Kaduwela, 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
Kaduwela, Sri Lanka

Average cloud cover in September - Kaduwela, 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
Kaduwela, Sri Lanka

Average visibility in September - Kaduwela, 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).

Kaduwela, Sri Lanka

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