September weather forecast
Puttalam, Sri Lanka

Weather in September

September, the first month of the autumn in Puttalam, is a hot month, with an average temperature varying between 30°C (86°F) and 26.5°C (79.7°F).

Temperature

In September, the average high-temperature is essentially the same as in August - a tropical 30°C (86°F). The average low-temperature, in Puttalam, Sri Lanka, is 26.5°C (79.7°F).

Heat index

In September, the average heat index is evaluated at a torrid 37°C (98.6°F). Take special precautions - heat exhaustion and heat cramps are expected. Heatstroke may occur with lengthy activity.
Take into consideration that the heat index values are calculated for shade and light wind conditions. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature', 'real feel', 'felt air temperature', or 'feels like', is an index that combines air temperature and relative humidity to determine the human-perceived temperature equivalent. Additional factors like activity, differences in body mass, height, and shape, pregnancy, and metabolic differences affect individual temperature impact. Be aware that direct exposure to sunlight increases heat impact and may raise the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.
The human body normally cools itself by perspiration. Excessive warmth is eliminated from the body by evaporation of sweat. Under high air temperature and humidity (high heat index) conditions, perspiration is limited, and the perception of heat is increased. When heat gain surpasses the level the body can shed, body temperature begins to increase, and consequently, overheating and dehydration can occur, with varying severity.

Humidity

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

Rainfall

In Puttalam, in September, during 17.4 rainfall days, 81mm (3.19") of precipitation is typically accumulated. Throughout the year, in Puttalam, there are 221.7 rainfall days, and 1071mm (42.17") of precipitation is accumulated.

Daylight

In Puttalam, 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 18:18. On the last day of September, in Puttalam, Sri Lanka, sunrise is at 05:58 and sunset at 18:02 +0530.

Sunshine

In September, the average sunshine in Puttalam is 8.9h.

UV index

The months with the highest UV index are January through December, with an average maximum UV index of 7. The months with the lowest UV index are January through December, with an average maximum UV index of 7. A UV Index estimate of 6 to 7 represents a high threat to health from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: In September, the average maximum UV index of 7 translate into the following recommendations:
Take precautions and utilize sun safety practices. Protection against skin and eye damage is required. 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. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.
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FAQ

What is the temperature in September in Puttalam?

In Puttalam, Sri Lanka, in September, the average high-temperature is 30°C (86°F), and the average low-temperature is 26.5°C (79.7°F). The average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which factors the actual air temperature with the relative humidity, in September is evaluated at 37°C (98.6°F).

What is the average humidity in September in Puttalam?

The average relative humidity in September is 77%.

How much does it rain in Puttalam in September?

In Puttalam, Sri Lanka, in September, during 17.4 rainfall days, 81mm (3.19") of precipitation is typically accumulated.

What is the average length of the day in September in Puttalam?

In September, the average day length is 12h and 10min.

When are sunrise and sunset in September in Puttalam?

On the first day of September in Puttalam, Sri Lanka, sunrise is at 06:02 and sunset at 18:18. On the last day of the month, sunrise is at 05:58 and sunset at 18:02 +0530.

How long on average sun shines in September in Puttalam?

In Puttalam, Sri Lanka, the average sunshine duration in September is 8.9h.

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

January through December, with an average maximum UV index of 7, are months with the highest UV index in Puttalam, Sri Lanka.

When is the lowest UV index in Puttalam?

January through December, with an average maximum UV index of 7, are months with the lowest UV index in Puttalam.

What is the UV index reading in September in Puttalam?

In Puttalam, Sri Lanka, 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 Sun's UV rays.

Average temperature in September
Puttalam, Sri Lanka

Average temperature in September - Puttalam, Sri Lanka
  • Average high temperature in September: 30°C

The warmest month (with the highest average high temperature) is April (31.9°C).
The months with the lowest average high temperature are January and December (29.3°C).

  • Average low temperature in September: 26.5°C

The month with the highest average low temperature is May (27.4°C).
The coldest month (with the lowest average low temperature) is January (22.8°C).

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Average pressure in September
Puttalam, Sri Lanka

Average pressure in September - Puttalam, 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
Puttalam, Sri Lanka

Average wind speed in September - Puttalam, Sri Lanka
  • Average wind speed in September: 26.5km/h

The windiest month (with the highest average wind speed) is June (30.4km/h).
The calmest month (with the lowest average wind speed) is April (14.1km/h).

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Average humidity in September
Puttalam, Sri Lanka

Average humidity in September - Puttalam, Sri Lanka
  • Average humidity in September: 77%

The month with the highest relative humidity is December (80%).
The month with the lowest relative humidity is March (73%).

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Average rainfall in September
Puttalam, Sri Lanka

Average rainfall in September - Puttalam, Sri Lanka
  • Average rainfall in September: 81mm

The wettest month (with the highest rainfall) is October (195mm).
The driest months (with the least rainfall) are January and February (31mm).

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Average rainfall days in September
Puttalam, Sri Lanka

Average rainfall days in September - Puttalam, Sri Lanka
  • Average rainfall days in September: 17.4 days

The month with the highest number of rainy days is November (25.1 days).
The month with the least rainy days is February (10.5 days).

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

Average daylight in September / Average sunshine in September - Puttalam, Sri Lanka
  • Average daylight in September: 12h and 10min

The month with the longest days is June (Average daylight: 12h and 35min).
The month with the shortest days is December (Average daylight: 11h and 40min).

  • Average sunshine in September: 8h and 54min

The month with the most sunshine is June (Average sunshine: 9h and 48min).
The month with the least sunshine is November (Average sunshine: 6h and 0min).

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Average sunshine days in September
Puttalam, Sri Lanka

Average sunshine days in September - Puttalam, Sri Lanka
  • Average sunshine days in September: 6.1 days

The month with the most sunshine days is January (16.8 days).
The month with the least sunshine days is April (3.6 days).

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Average UV index in September
Puttalam, Sri Lanka

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

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

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Average cloud cover in September
Puttalam, Sri Lanka

Average cloud cover in September - Puttalam, Sri Lanka
  • Average cloud cover in September: 45

The month with the most cloud cover is June (Cloud cover 47).
The month with the least cloud cover is March (Cloud cover 22).

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Average visibility in September
Puttalam, Sri Lanka

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

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

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