Hilo
Hawaii, USA
Long-term weather forecast
Long-term weather forecast

January weather forecast and climate
Hilo, HI

January, like December, in Hilo, Hawaii, is another warm winter month, with average temperature ranging between min 63.9°F (17.7°C) and max 79°F (26.1°C).

Temperature

In Hilo, the average high-temperature in January is almost the same as in December - a still moderately hot 79°F (26.1°C). In Hilo, in January, the average low-temperature is 63.9°F (17.7°C).

Humidity

In Hilo, the average relative humidity in January is 76.6%.

Rainfall

In Hilo, in January, it is raining for 16.3 days, with typically 7.8" (198mm) of accumulated precipitation. In Hilo, during the entire year, the rain falls for 272.1 days and collects up to 84.4" (2144mm) of precipitation.

Ocean temperature

In Hilo, the average water temperature is 76.6°F (24.8°C). Depending on a person's sensitivity to cold, with regards to sunshine, wind, and air temperature, a quick swim in 76.6°F (24.8°C) water may be enjoyable. (FYI: The official water temperature required for the Olympic swimming competition is 77°F (25°C) to 82.4°F (28°C).)

Daylight

In January, the average length of the day in Hilo is 11.1h.

Sunshine

The average sunshine in January is 5.2h.

UV index

The average daily maximum UV index in Hilo, Hawaii, is 8. A UV Index estimate of 8 to 10 represents a very high health vulnerability from unprotected exposure to the Sun's UV rays for ordinary individuals.
In January, the average maximum UV index of 8 translate into the following recommendations:
Take special precautions, as unprotected eyes and skin can be burned and damaged quickly. 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. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Beware! The reflection of water and sand dramatically increases exposure to the UV rays.

What is the temperature in January in Hilo?

In Hilo, in January, the average high-temperature is 79°F (26.1°C), and the average low-temperature is 63.9°F (17.7°C).

What is the average humidity in January in Hilo?

In January, the average relative humidity in Hilo, Hawaii, is 76.6%.

How many days does it rain in January in Hilo?

In Hilo, Hawaii, in January, during 16.3 rainfall days, 7.8" (198mm) of precipitation is typically accumulated.

What is the water temperature in January in Hilo?

In Hilo, in January, the average water temperature is 76.6°F (24.8°C). A person's cold intolerance, with sunshine, wind, and air temperature, are essential factors for enjoying swimming in 76.6°F (24.8°C) water.

What is the average length of the day in January in Hilo?

In Hilo, the average length of the day in January is 11.1h.

How long on average sun shines in January in Hilo?

In January, the average sunshine is 5.2h.

How high is the UV index in January in Hilo?

In Hilo, the average daily maximum UV index in January is 8. A UV Index reading of 8 to 10 represents a very high hazard to health from unsafe exposure to the Sun's UV rays.
Average temperature in January - Hilo, HI
  • Average high temperature in January: 79°F

The warmest month (with the highest average high temperature) is September (83.3°F).
The month with the lowest average high temperature is February (78.8°F).

  • Average low temperature in January: 63.8°F

The month with the highest average low temperature is September (69.7°F).
The coldest month (with the lowest average low temperature) is February (63.5°F).

Average humidity in January - Hilo, HI
  • Average humidity in January: 76.6%

The month with the highest relative humidity is November (80.3%).
The month with the lowest relative humidity is February (76%).

Average rainfall in January - Hilo, HI
  • Average rainfall in January: 7.8"

The wettest month (with the highest rainfall) is March (10.6").
The driest month (with the lowest rainfall) is June (4.3").

Average rainfall days in January - Hilo, HI
  • Average rainfall days in January: 16.3 days

Months with the highest number of rainy days are July and August (26.8 days).
The month with the lowest number of rainy days is February (15.8 days).

Average sea temperature in January - Hilo, HI
  • Average sea temperature in January: 76.5°F

The best month for swimming (with the highest average sea temperature) is September (79.3°F).
The coldest month (with the lowest average sea temperature) is March (75.7°F).

Average daylight in January / Average sunshine in January - Hilo, HI
  • Average daylight in January: 11.1h

The month with the longest days is June (Average daylight: 13.3h).
The month with shortest days is December (Average daylight: 11h).

  • Average sunshine in January: 5.2h

The month with most sunshine is June (Average sunshine: 5.9h).
The month with least sunshine is November (Average sunshine: 3.8h).

Average UV index in January - Hilo, HI
  • Average UV index in January: 8

Months with the highest UV index are March, April, May, June, July, August and September (UV index 12).
The month with the lowest UV index is December (UV index 7).