October weather forecast and climate
Colombo, Sri Lanka

Statues on the Seema Malaka Temple in Colombo, Sri Lanka, overlooking the Beira Lake
Statues on the Seema Malaka Temple in Colombo, Sri Lanka, overlooking the Beira Lake

Weather in October

October is a hot autumn month in Colombo, Sri Lanka, with average temperature varying between 25°C (77°F) and 30°C (86°F).

Temperature

In Colombo, Sri Lanka, the average high-temperature is almost the same as in September - a hot 30°C (86°F). In October, in Colombo, the average low-temperature is 25°C (77°F).

Heat index

In October, the average heat index is calculated to be a sweltering 37.7°C (99.9°F). Take extra precautions, as heat cramps and heat exhaustion are possible. Sustained activity may result in heatstroke.
Take into consideration that the heat index values are calculated for shade and light wind conditions. With exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature', 'feels like', 'real feel', or 'felt air temperature', is a calculated temperature value of how hot it feels when the moisture in the air is factored in. Additional factors like activity, metabolic differences, pregnancy, and wind affect individual temperature impact. Bear in mind that direct sunshine exposure increases weather impact, and may raise 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.
To prevent overheating and help regulate its internal temperature, the human body sweat and rely on the evaporation to cool down. 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 October, the average relative humidity is 80%.

Rainfall

In Colombo, in October, during 27 rainfall days, 237mm (9.33") of precipitation is typically accumulated. Throughout the year, in Colombo, there are 289.4 rainfall days, and 2262mm (89.06") of precipitation is accumulated.

Sea temperature

In Colombo, the average water temperature is 28.6°C (83.5°F).
Note: Water temperature between 25°C (77°F) and 29°C (84.2°F) is regarded as very warm and enjoyable by all. With these temperatures, water activities are pleasurable, without feeling uncomfortable for prolonged periods.

Daylight

The average length of the day in October is 12h.

Sunshine

In Colombo, the average sunshine is 7.7h.

UV index

Months with the lowest UV index are May, June, August and October, with an average maximum UV index of 6. A UV Index reading of 6 to 7 represents a high health risk from the exposure to the Sun's UV radiation for ordinary individuals.
Note: In October, the average maximum UV index of 6 translate into the following recommendations:
Take precautions against overexposure. Fair-skinned people may get burned in less than 20 minutes. 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. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Beware! The reflection of water and sand dramatically increases exposure to the UV rays.
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FAQ

What is the temperature in October in Colombo?

In Colombo, Sri Lanka, in October, the average high-temperature is 30°C (86°F), and the average low-temperature is 25°C (77°F). The average heat index (a.k.a. 'felt air temperature', 'feels like'), which factors the actual air temperature with the relative humidity, in October is calculated to be 37.7°C (99.9°F).

What is the average humidity in October in Colombo?

The average relative humidity in October in Colombo is 80%.

How many days does it rain in October in Colombo?

In Colombo, Sri Lanka, in October, it is raining for 27 days, with typically 237mm (9.33") of accumulated precipitation.

What is the sea water temperature in October in Colombo?

In October, the average sea temperature in Colombo is 28.6°C (83.5°F). Water temperature between 25°C (77°F) and 29°C (84.2°F) is regarded as very warm and enjoyable by all. With these temperatures, water activities are pleasurable, without feeling uncomfortable for prolonged periods.

What is the average length of the day in October in Colombo?

In October, the average length of the day is 12h.

How many hours of sunshine does Colombo have in October?

In Colombo, Sri Lanka, the average sunshine in October is 7.7h.

What is the month with the lowest UV index in Colombo?

Months with the lowest UV index in Colombo are May, June, August and October, with an average maximum UV index of 6.

How high is the UV index in October in Colombo?

The average daily maximum UV index in October in Colombo is 6. A UV Index reading of 6 to 7 represents a high health vulnerability from the exposure to the Sun's UV rays.

Average temperature in October
Colombo, Sri Lanka

Average temperature in October - Colombo, Sri Lanka
  • Average high temperature in October: 30°C

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

  • Average low temperature in October: 25°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).

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Average pressure in October
Colombo, Sri Lanka

Average pressure in October - Colombo, Sri Lanka
  • Average pressure in October: 1009.9mbar

The month with the highest atmospheric pressure is January (1011.6mbar).
The month with the lowest atmospheric pressure is May (1008.6mbar).

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Average wind speed in October
Colombo, Sri Lanka

Average wind speed in October - Colombo, Sri Lanka
  • Average wind speed in October: 10.2km/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).

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Average humidity in October
Colombo, Sri Lanka

Average humidity in October - Colombo, Sri Lanka
  • Average humidity in October: 80%

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

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Average rainfall in October
Colombo, Sri Lanka

Average rainfall in October - Colombo, Sri Lanka
  • Average rainfall in October: 237mm

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

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Average rainfall days in October
Colombo, Sri Lanka

Average rainfall days in October - Colombo, Sri Lanka
  • Average rainfall days in October: 27 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).

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Average sea temperature in October
Colombo, Sri Lanka

Average sea temperature in October - Colombo, Sri Lanka
  • Average sea temperature in October: 28.6°C

The best month for swimming (with the highest average sea temperature) is April (29.6°C).
The coldest month (with the lowest average sea temperature) is August (27.2°C).

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Average daylight in October /
Average sunshine in October
Colombo, Sri Lanka

Average daylight in October / Average sunshine in October - Colombo, Sri Lanka
  • Average daylight in October: 12h

Months with the longest days are June and July (Average daylight: 12.5h).
The month with the shortest days is December (Average daylight: 11.7h).

  • Average sunshine in October: 7.7h

The month with the most sunshine is January (Average sunshine: 9.1h).
The month with the least sunshine is November (Average sunshine: 6.7h).

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Average sunshine days in October
Colombo, Sri Lanka

Average sunshine days in October - Colombo, Sri Lanka
  • Average sunshine days in October: 1.7 days

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

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Average UV index in October
Colombo, Sri Lanka

Average UV index in October - Colombo, Sri Lanka
  • Average UV index in October: 6

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

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Average cloud cover in October
Colombo, Sri Lanka

Average cloud cover in October - Colombo, Sri Lanka
  • Average cloud cover in October: 49

The month with the most cloud cover is June (Cloud cover 57).
The month with the least cloud cover is January (Cloud cover 24).

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Average visibility in October
Colombo, Sri Lanka

Average visibility in October - Colombo, Sri Lanka
  • Average visibility in October: 9km

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

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