July 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 July

July, like June, in Colombo, Sri Lanka, is a moderately hot summer month, with temperature in the range of an average low of 25.3°C (77.5°F) and an average high of 28.9°C (84°F).

Temperature

July and August, with an average high-temperature of 28.9°C (84°F), are the coldest months.

Heat index

In July, the average heat index is calculated to be a sweltering 35.1°C (95.2°F). Take extra precautions, as heat cramps and heat exhaustion are possible. Sustained activity may result in heatstroke.
Note that heat index values are valued for light wind and location in the shade. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like', 'apparent temperature', 'felt air temperature', or 'real feel', combines air temperature and relative humidity to represent a human perceived temperature equivalent. Additional factors like activity, metabolic differences, pregnancy, and differences in body mass, height, and shape 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 especially crucial for babies and toddlers. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it is vital to remain hydrated, particularly during prolonged physical activities.
The human body cools itself through perspiration, as excessive warmth is removed from the body through sweat evaporation. High relative humidity reduces the evaporation rate, resulting in a lower heat removal rate from the body, causing the perception of being overheated. 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

Months with the highest humidity in Colombo, Sri Lanka, are June through August, with an average relative humidity of 83%.

Rainfall

In Colombo, Sri Lanka, during July, the rain falls for 29.8 days and regularly aggregates up to 256mm (10.08") of precipitation. In Colombo, during the entire year, the rain falls for 289.4 days and collects up to 2262mm (89.06") of precipitation.

Sea temperature

In Colombo, in July, the average water temperature is 27.3°C (81.1°F).
Note: For any water activity, surface water temperatures between 25°C (77°F) and 29°C (84.2°F) are considered as excellent and extremely pleasant for lengthened periods.

Daylight

Months with the longest days are June and July, with an average of 12.5h of daylight.

Sunshine

The average sunshine in Colombo, Sri Lanka, is 7.6h.

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. A UV Index value of 6 to 7 symbolizes a high threat to health from unsafe exposure to the UV radiation for the ordinary person.
Note: The average daily UV index of 7 transform into the following instructions:
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. A wide-brim hat offers excellent sun protection for 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. Caution! The reflection of sand and water significantly increases the intensity of the Sun's UV radiation.
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FAQ

What is the coldest month in Colombo?

July and August, with an average high-temperature of 28.9°C (84°F), are the coldest months.

What is the temperature in July in Colombo?

The average high-temperature, in July, in Colombo, is 28.9°C (84°F), while the average low-temperature is 25.3°C (77.5°F). The average heat index (a.k.a. 'felt air temperature', 'real feel'), which takes the relative humidity and factors it into the air temperature reading, in July is calculated to be 35.1°C (95.2°F).

What is the most humid month in Colombo?

June through August, with an average relative humidity of 83%, are most humid months in Colombo.

What is the average humidity in July in Colombo?

In July, the average relative humidity in Colombo is 83%.

How much does it rain in Colombo in July?

In July, the rain falls for 29.8 days. Throughout July, 256mm (10.08") of precipitation is accumulated.

What is the sea water temperature in July in Colombo?

In Colombo, the average seawater temperature in July is 27.3°C (81.1°F). For any water activity, surface water temperatures between 25°C (77°F) and 29°C (84.2°F) are considered as excellent and extremely pleasant for lengthened periods.

When are the longest days in Colombo?

June and July, with an average of 12.5h of daylight, are months with the longest days in Colombo, Sri Lanka.

How many hours of daylight does Colombo have in July?

In July, the average length of the day in Colombo, Sri Lanka, is 12.5h.

How long on average sun shines in July in Colombo?

In July, the average sunshine is 7.6h.

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

Months with the highest UV index are January through April, July, September, November and December, with an average maximum UV index of 7.

What is the UV index reading in July in Colombo?

In Colombo, Sri Lanka, the average daily maximum UV index in July is 7. A UV Index of 6 to 7 symbolizes a high health threat from the exposure to the Sun's UV rays.

Average temperature in July
Colombo, Sri Lanka

Average temperature in July - Colombo, Sri Lanka
  • Average high temperature in July: 28.9°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 July: 25.3°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 July
Colombo, Sri Lanka

Average pressure in July - Colombo, Sri Lanka
  • Average pressure in July: 1008.7mbar

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 July
Colombo, Sri Lanka

Average wind speed in July - Colombo, Sri Lanka
  • Average wind speed in July: 14.1km/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 July
Colombo, Sri Lanka

Average humidity in July - Colombo, Sri Lanka
  • Average humidity in July: 83%

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 July
Colombo, Sri Lanka

Average rainfall in July - Colombo, Sri Lanka
  • Average rainfall in July: 256mm

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 July
Colombo, Sri Lanka

Average rainfall days in July - Colombo, Sri Lanka
  • Average rainfall days in July: 29.8 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 July
Colombo, Sri Lanka

Average sea temperature in July - Colombo, Sri Lanka
  • Average sea temperature in July: 27.3°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 July /
Average sunshine in July
Colombo, Sri Lanka

Average daylight in July / Average sunshine in July - Colombo, Sri Lanka
  • Average daylight in July: 12.5h

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 July: 7.6h

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 July
Colombo, Sri Lanka

Average sunshine days in July - Colombo, Sri Lanka
  • Average sunshine days in July: 0.4 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 July
Colombo, Sri Lanka

Average UV index in July - Colombo, Sri Lanka
  • Average UV index in July: 7

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 July
Colombo, Sri Lanka

Average cloud cover in July - Colombo, Sri Lanka
  • Average cloud cover in July: 54

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 July
Colombo, Sri Lanka

Average visibility in July - Colombo, Sri Lanka
  • Average visibility in July: 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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