January weather forecastKoloa, Tonga
January
Weather in January
Koloa, Tonga starts the year in January with high humidity and a significant amount of rainfall contributing to the wet season. January's heavy monsoon showers result in a total rainfall of 275mm (10.83"), the highest in the year. As the month progresses, it continues a similar pattern of weather witnessed in the rainy season. Sweltering highs and sticky nights dominate January, while the late afternoon often sees tropical thunderstorm activity. It's a month when protective rain gear, sunblock and insect repellents become weather essentials for locals and visitors alike.Temperature
In January, Koloa notes an average high-temperature of a still moderately hot 27.8°C (82°F), hardly different from the preceding month. A minimal decline in temperature from daytime highs is anticipated throughout the January nights, averaging a still warm 27.2°C (81°F).Heat index
The heat index value during January is calculated to be a hot 31°C (87.8°F). When exposure and activity are sustained, they could induce fatigue, with a chance of heat cramps.Research indicates the heat index considers values in shaded locales and with light winds. When under direct sunshine, the heat index may be elevated by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', binds temperature metrics with humidity values to give a sense of the actual warmth. This impact is subjective, influenced by the person's physical activity and individual heat perception, affected by factors including wind, attire, and metabolic differences. Direct sun rays have a notable impact on perceived temperature, which can raise the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly relevant to babies and toddlers. Kids are usually more vulnerable than adults, given their lesser sweating ability. Along with their larger skin surface relative to their small stature and the excess heat due to their activity, their risk is amplified.
Humidity
The average relative humidity in January is 78%.Rainfall
January is the month with the most rainfall. Rain falls for 23 days and accumulates 275mm (10.83") of precipitation.Daylight
In January, the average length of the day is 13h and 6min.On the first day of the month, sunrise is at 06:02 and sunset at 19:16. On the last day of January, in Koloa, sunrise is at 06:21 and sunset at 19:17 +13.
Sunshine
In January, the average sunshine in Koloa is 7h.UV index
The months with the highest UV index in Koloa, Tonga, are January through April and December, with an average maximum UV index of 7. A UV Index reading of 6 to 7 represents a high threat to health from exposure to the Sun's UV rays for the average person.Note: The daily high UV index of 7 in January translates into this advice:
Avoid overexposure. Fair-skinned individuals can burn in under 20 minutes. Seek shade and limit direct sun exposure between 10 a.m. and 4 p.m., the peak period for UV radiation. Keep in mind that shade structures like parasols or canopies do not offer complete sun protection. Wearing sunglasses with both UVA and UVB protection effectively reduces sun-induced eye damage.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in January
Koloa, Tonga
- Average high temperature in January: 27.8°C
The warmest month (with the highest average high temperature) is February (28.3°C).
The month with the lowest average high temperature is September (24.7°C).
- Average low temperature in January: 27.2°C
The month with the highest average low temperature is February (27.3°C).
The coldest month (with the lowest average low temperature) is July (23.7°C).
Average pressure in January
Koloa, Tonga
- Average pressure in January: 1007.8mbar
The months with the highest atmospheric pressure are August and September (1014.8mbar).
The month with the lowest atmospheric pressure is January (1007.8mbar).
Average wind speed in January
Koloa, Tonga
- Average wind speed in January: 22.7km/h
The windiest month (with the highest average wind speed) is June (27km/h).
The calmest month (with the lowest average wind speed) is March (20.2km/h).
Average humidity in January
Koloa, Tonga
- Average humidity in January: 78%
The months with the highest relative humidity are September, October and November (79%).
The month with the lowest relative humidity is April (77%).
Average rainfall in January
Koloa, Tonga
- Average rainfall in January: 275mm
The wettest month (with the highest rainfall) is January (275mm).
The driest month (with the least rainfall) is August (42mm).
Average rainfall days in January
Koloa, Tonga
- Average rainfall days in January: 23 days
The months with the highest number of rainy days are February and March (24.3 days).
The month with the least rainy days is August (14.6 days).
Average daylight in January /
Average sunshine in January
Koloa, Tonga
- Average daylight in January: 13h and 6min
The month with the longest days is December (Average daylight: 13h and 12min).
The month with the shortest days is June (Average daylight: 11h and 0min).
- Average sunshine in January: 7h and 0min
The month with the most sunshine is December (Average sunshine: 8h and 12min).
The month with the least sunshine is September (Average sunshine: 6h and 36min).
Average sunshine days in January
Koloa, Tonga
- Average sunshine days in January: 4.3 days
The month with the most sunshine days is August (11.8 days).
The month with the least sunshine days is February (2.3 days).
Average UV index in January
Koloa, Tonga
- Average UV index in January: 7
The months with the highest UV index are January, February, March, April and December (UV index 7).
The months with the lowest UV index are May, June, July, August, September, October and November (UV index 6).
Average cloud cover in January
Koloa, Tonga
- Average cloud cover in January: 50
The month with the most cloud cover is October (Cloud cover 55).
The month with the least cloud cover is March (Cloud cover 46).
Average visibility in January
Koloa, Tonga
- Average visibility in January: 9km
The months with the highest visibility are February, March, April, May, June, July, August, September, October, November and December (10km).
The month with the lowest visibility is January (9km).
