January weather forecast
Rajagiriya, Sri Lanka

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Weather in January

January is a tropical winter month in Rajagiriya, Sri Lanka, with temperature in the range of an average high of 30.8°C (87.4°F) and an average low of 23.1°C (73.6°F).

Temperature

The advent of January sees the average high-temperature at a hot 30.8°C (87.4°F), subtly shifted from December's 29.9°C (85.8°F). During January, the temperature is averaged to a low of 23.1°C (73.6°F) at night.

Heat index

Throughout January, the heat index is estimated at a very hot 38°C (100.4°F). More safety actions are required, heat exhaustion and heat cramps are probable. Long-term activity may precipitate heatstroke.
Research indicates the heat index considers values in shaded locales and with light winds. The heat index can potentially augment by 15 Fahrenheit (8 Celsius) degrees due to direct sunlight.
Note: The heat index, also known as 'feels like' or 'felt air temperature', determines the feeling of heat when you account for the relative humidity. Factors such as metabolic variation, pregnancy, and physical activity play a role in one's impression of weather. Direct sunlight can potentially raise the heat index by 15 Fahrenheit (8 Celsius) degrees, so it's crucial to consider. Heat index values are quite important for babies and toddlers. Children commonly overlook the importance of rest and fluid replenishment. Thirst, being a delayed sign of dehydration, emphasizes the need to keep hydration up, especially during lengthy physical activities.
The human body cools itself through perspiration, as excessive warmth is removed from the body through sweat evaporation. An increase in relative humidity hinders the body's normal cooling function by reducing evaporation, thereby decreasing the rate of body cooling and enhancing the sense of warmth. 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 in Rajagiriya are January and February, with an average relative humidity of 74%.

Rainfall

The month with the least rainfall is January, when the rain falls for 11.6 days and typically collects 40mm (1.57") of precipitation.

Daylight

In January, the average length of the day is 11h and 46min.
On the first day of January in Rajagiriya, sunrise is at 06:21 and sunset at 18:05. On the last day of the month, sunrise is at 06:28 and sunset at 18:18 +0530.

Sunshine

With an average of 9.1h of sunshine, January has the most sunshine of the year.

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 reading of 6 to 7 represents a high health hazard from unsafe exposure to UV radiation for ordinary individuals.
Note: In January, a daily maximum UV index of 7 leads to the following instructions:
Prevent overexposure. Protection from the sun's harmful effects is needed. The Sun's UV radiation is most potent between the hours of 10 a.m. and 4 p.m. Try to avoid direct sunlight during this time. Protect your eyes, ears, face, and neck from the Sun by wearing a wide-brimmed hat.
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Frequently asked questions

How hot is it in Rajagiriya in January?

During January, Rajagiriya experiences an average high-temperature of 30.8°C (87.4°F) and a low-temperature of 23.1°C (73.6°F). The average heat index (a.k.a. 'apparent temperature', 'feels like'), which factors the actual air temperature with the relative humidity, in January is estimated at 38°C (100.4°F).

What is the least humid month in Rajagiriya?

The months with the lowest humidity in Rajagiriya, Sri Lanka, are January and February, with an average relative humidity of 74%.

What is the average humidity in January in Rajagiriya?

In Rajagiriya, Sri Lanka, the average relative humidity in January is 74%.

What is the driest month in Rajagiriya?

The month with the least rainfall is January, when the rain falls for 11.6 days and typically collects 40mm (1.57") of precipitation.

How many days does it rain in January in Rajagiriya?

In Rajagiriya, Sri Lanka, in January, during 11.6 rainfall days, 40mm (1.57") of precipitation is typically accumulated.

How many hours of daylight does Rajagiriya have in January?

In January, the average day length in Rajagiriya is 11h and 46min.

When are sunrise and sunset in January in Rajagiriya?

On the first day of January in Rajagiriya, sunrise is at 06:21 and sunset at 18:05. On the last day of the month, sunrise is at 06:28 and sunset at 18:18 +0530.

What month has the most sunshine in Rajagiriya?

With an average of 9.1h of sunshine, January has the most sunshine of the year in Rajagiriya, Sri Lanka.

How many hours of sunshine does Rajagiriya have in January?

In January, the average sunshine duration is 9.1h.

When is the highest UV index in Rajagiriya?

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

What is the UV index reading in January in Rajagiriya?

In January, the average daily maximum UV index in Rajagiriya is 7. A UV Index reading of 6 to 7 represents a high health risk from unsafe exposure to Sun's UV rays.

Average temperature in January
Rajagiriya, Sri Lanka

Average temperature in January - Rajagiriya, Sri Lanka
  • Average high temperature in January: 30.8°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 January: 23.1°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 January
Rajagiriya, Sri Lanka

Average pressure in January - Rajagiriya, Sri Lanka
  • Average pressure in January: 1011.6mbar

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 January
Rajagiriya, Sri Lanka

Average wind speed in January - Rajagiriya, Sri Lanka
  • Average wind speed in January: 12.8km/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 January
Rajagiriya, Sri Lanka

Average humidity in January - Rajagiriya, Sri Lanka
  • Average humidity in January: 74%

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%).

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Average rainfall in January
Rajagiriya, Sri Lanka

Average rainfall in January - Rajagiriya, Sri Lanka
  • Average rainfall in January: 40mm

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 January
Rajagiriya, Sri Lanka

Average rainfall days in January - Rajagiriya, Sri Lanka
  • Average rainfall days in January: 11.6 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 daylight in January /
Average sunshine in January
Rajagiriya, Sri Lanka

Average daylight in January / Average sunshine in January - Rajagiriya, Sri Lanka
  • Average daylight in January: 11h and 5min

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 January: 9h and 1min

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).

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Average sunshine days in January
Rajagiriya, Sri Lanka

Average sunshine days in January - Rajagiriya, Sri Lanka
  • Average sunshine days in January: 17.2 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).

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Average UV index in January
Rajagiriya, Sri Lanka

Average UV index in January - Rajagiriya, Sri Lanka
  • Average UV index in January: 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).

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Average cloud cover in January
Rajagiriya, Sri Lanka

Average cloud cover in January - Rajagiriya, Sri Lanka
  • Average cloud cover in January: 24

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 January
Rajagiriya, Sri Lanka

Average visibility in January - Rajagiriya, Sri Lanka
  • Average visibility in January: 10km

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).

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Rajagiriya, Sri Lanka

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