September weather forecast
Sigiriya, Sri Lanka

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Weather in September

The month of September marks a turn in the weather pattern in Sigiriya, Sri Lanka. A sharp increase in the rainfall to 53mm (2.09"), almost doubling the August levels, signals the end of the dry season. Although the maximum temperature remains consistent at 33.9°C (93°F), a drop in daylight hours suggests a transition towards the end of the year. It still feels quite tropical, thus keeping the weather fascinating for visitors. Be ready for occasional showers while planning those outdoor activities.

Temperature

September ushers in an average high-temperature of a still hot 33.9°C (93°F) in Sigiriya, aligning closely with the preceding month. Throughout September, an average low-temperature of 24.1°C (75.4°F) is expected.

Heat index

The heat index value for September is computed to be a burning hot 45°C (113°F). Be on the lookout: Heat cramps and heat exhaustion are anticipated. Continued exertion can result in heatstroke.
Heat index specifics point out values are for conditions of shade and a slight breeze. 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 'apparent temperature' or 'felt air temperature', is an estimation of the warmth sensation when considering humidity levels. One's perception of temperature is subjective, varying based on their activity and individual heat perception, influenced by factors like wind, clothing, and metabolic variations. Given the impact of direct sunlight, it's noteworthy that the felt temperature can rise by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly relevant to children. 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.
As a reaction to high temperatures, the human body begins to perspire, using the evaporation of sweat to lower its temperature. In the presence of elevated relative humidity, the evaporation rate decreases. This reduction leads to increased body heat retention compared to conditions of dry air. When body temperature rises due to an imbalance in heat gain, there's a potential for dehydration and overheating.

Humidity

The months with the lowest humidity are June through September, with an average relative humidity of 67%.

Rainfall

In Sigiriya, in September, it is raining for 13.5 days, with typically 53mm (2.09") of accumulated precipitation. In Sigiriya, during the entire year, the rain falls for 196.8 days and collects up to 943mm (37.13") of precipitation.

Daylight

In Sigiriya, the average length of the day in September is 12h and 10min.
On the first day of September in Sigiriya, sunrise is at 05:58 and sunset at 18:14. On the last day of the month, sunrise is at 05:55 and sunset at 17:58 +0530.

Sunshine

The average sunshine in September is 10.9h.

UV index

The months with the highest UV index are February through October, with an average maximum UV index of 7. A UV Index value of 6 to 7 symbolizes a high health risk from unsafe exposure to UV radiation for the average person.
Note: The maximum daily UV index, 7 in September, converts into the following recommendations:
Refrain from overexposure. Fair-skinned individuals could burn in under 20 minutes. Limit direct sun exposure and seek shade between 10 a.m. and 4 p.m., the time of the most intense UV radiation, noting that shade structures may not provide total sun protection. Wearing a wide-brim hat can block approximately 50% of UV radiation, protecting the eyes.
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Frequently asked questions

How hot does it get in Sigiriya in September?

In September, in Sigiriya, the average high-temperature is 33.9°C (93°F), and the average low-temperature is 24.1°C (75.4°F). In September, the average heat index (a.k.a. 'feels like', 'real feel'), which combines relative humidity and air temperature, is computed to be 45°C (113°F).

What is the least humid month in Sigiriya?

The months with the lowest humidity in Sigiriya are June through September, with an average relative humidity of 67%.

What is the average humidity in September in Sigiriya?

In Sigiriya, Sri Lanka, the average relative humidity in September is 67%.

How many days does it rain in September in Sigiriya?

In Sigiriya, in September, it is raining for 13.5 days, with typically 53mm (2.09") of accumulated precipitation.

How many hours of daylight does Sigiriya have in September?

In Sigiriya, Sri Lanka, the average day length in September is 12h and 10min.

When is the sunrise / sunset in September in Sigiriya?

In September, on the first day of the month, sunrise is at 05:58 and sunset at 18:14. On the last day of the month, in Sigiriya, sunrise is at 05:55 and sunset at 17:58 +0530.

How many hours of sunshine does Sigiriya have in September?

In September, the average sunshine duration in Sigiriya is 10.9h.

What are the months with the highest UV index in Sigiriya?

February through October, with an average maximum UV index of 7, are months with the highest UV index in Sigiriya.

What is the UV index intensity in September in Sigiriya?

In Sigiriya, the average daily maximum UV index in September is 7. A UV Index reading of 6 to 7 represents a high health threat from exposure to the Sun's UV radiation.

Average temperature in September
Sigiriya, Sri Lanka

Average temperature in September - Sigiriya, Sri Lanka
  • Average high temperature in September: 33.9°C

The warmest month (with the highest average high temperature) is April (34.9°C).
The months with the lowest average high temperature are January and December (29.3°C).

  • Average low temperature in September: 24.1°C

The month with the highest average low temperature is June (24.8°C).
The coldest months (with the lowest average low temperature) are January and February (20°C).

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Average pressure in September
Sigiriya, Sri Lanka

Average pressure in September - Sigiriya, Sri Lanka
  • Average pressure in September: 1008.8mbar

The month with the highest atmospheric pressure is January (1012mbar).
The month with the lowest atmospheric pressure is June (1007.5mbar).

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Average wind speed in September
Sigiriya, Sri Lanka

Average wind speed in September - Sigiriya, Sri Lanka
  • Average wind speed in September: 18.7km/h

The windiest month (with the highest average wind speed) is June (23.8km/h).
The calmest month (with the lowest average wind speed) is April (7.1km/h).

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Average humidity in September
Sigiriya, Sri Lanka

Average humidity in September - Sigiriya, Sri Lanka
  • Average humidity in September: 67%

The month with the highest relative humidity is December (84%).
The months with the lowest relative humidity are June, July, August and September (67%).

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Average rainfall in September
Sigiriya, Sri Lanka

Average rainfall in September - Sigiriya, Sri Lanka
  • Average rainfall in September: 53mm

The wettest month (with the highest rainfall) is October (214mm).
The driest month (with the least rainfall) is June (15mm).

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Average rainfall days in September
Sigiriya, Sri Lanka

Average rainfall days in September - Sigiriya, Sri Lanka
  • Average rainfall days in September: 13.5 days

The month with the highest number of rainy days is November (24.1 days).
The month with the least rainy days is June (7.8 days).

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Average daylight in September /
Average sunshine in September
Sigiriya, Sri Lanka

Average daylight in September / Average sunshine in September - Sigiriya, Sri Lanka
  • Average daylight in September: 12h and 1min

The month with the longest days is June (Average daylight: 12h and 36min).
The month with the shortest days is December (Average daylight: 11h and 42min).

  • Average sunshine in September: 10h and 5min

The month with the most sunshine is June (Average sunshine: 11h and 18min).
The month with the least sunshine is December (Average sunshine: 4h and 54min).

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Average sunshine days in September
Sigiriya, Sri Lanka

Average sunshine days in September - Sigiriya, Sri Lanka
  • Average sunshine days in September: 13.3 days

The month with the most sunshine days is July (16 days).
The month with the least sunshine days is November (4.2 days).

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Average UV index in September
Sigiriya, Sri Lanka

Average UV index in September - Sigiriya, Sri Lanka
  • Average UV index in September: 7

The months with the highest UV index are February, March, April, May, June, July, August, September and October (UV index 7).
The months with the lowest UV index are January, November and December (UV index 6).

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Average cloud cover in September
Sigiriya, Sri Lanka

Average cloud cover in September - Sigiriya, Sri Lanka
  • Average cloud cover in September: 30

The month with the most cloud cover is December (Cloud cover 56).
The month with the least cloud cover is May (Cloud cover 26).

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Average visibility in September
Sigiriya, Sri Lanka

Average visibility in September - Sigiriya, Sri Lanka
  • Average visibility in September: 10km

The months with the highest visibility are May, June, July, August and September (10km).
The months with the lowest visibility are January and December (7km).

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Sigiriya, Sri Lanka

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