January weather forecast
Hilo, HI

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Weather in January

January in Hilo, Hawaii, kicks off the year with relatively stable weather patterns, manifesting in undulating highs and lows. A signature characteristic of Hilo’s January weather is the slightly higher rainfall of 2.72in compared to the following month. The wind speed tends to follow a predictable rhythm, with occasional higher gusts blowing through. The sea remains inviting, with a mild temperature perfect for a range of water activities. Sea enthusiasts and surfers find the conditions particularly advantageous, as moderate waves are usually present.

Temperature

January's onset in Hilo brings an average high-temperature of a still pleasant 70.9°F (21.6°C), showing a minute difference from December's 71.6°F (22°C). Night temperatures during January stabilize at an average of 64.8°F (18.2°C), closely mirroring the daytime temperatures.

Humidity

January, May through July, with an average relative humidity of 78%, are the least humid months.

Rainfall

In Hilo, during January, the rain falls for 13.3 days and regularly aggregates up to 2.72" (69mm) of precipitation. In Hilo, during the entire year, the rain falls for 227.7 days and collects up to 27.83" (707mm) of precipitation.

Ocean temperature

In Hilo, the average seawater temperature in January is 76.6°F (24.8°C).
Note: Cold sensitivities vary, but with the right amount of sunshine, a gentle breeze, and a warm day, a swim in 76.6°F (24.8°C) waters might be just right. Remember, Olympic swimmers are used to waters between 77°F (25°C) and 82.4°F (28°C).

Daylight

In January, the average length of the day is 11h and 6min.
On the first day of January in Hilo, sunrise is at 6:54 am and sunset at 5:52 pm. On the last day of the month, sunrise is at 6:55 am and sunset at 6:11 pm HST.

Sunshine

In January, the average sunshine is 7.9h.

UV index

January through April, with an average maximum UV index of 5, are months with the lowest UV index. A UV Index of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV radiation for ordinary individuals.
Note: The average daily UV index of 5 in January transforms into the following instructions:
Adopt protective measures - It is advised to guard against sun damage. Solar radiation is at its peak intensity during midday, so it's advisable to stay indoors or in the shade. Clothes that are both tight-knit and comfortably loose are prime choices for sun protection. Heads up! Sand and water reflection magnifies the UV exposure from the Sun.
Updated: Feb 10, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the average January temperature in Hilo?

The high-temperature during January is 70.9°F (21.6°C) and the low-temperature is 64.8°F (18.2°C).

What is the least humid month in Hilo?

January, May through July, with an average relative humidity of 78%, are the least humid months in Hilo, Hawaii.

What is the average humidity in January in Hilo?

In Hilo, Hawaii, the average relative humidity in January is 78%.

How many days does it rain in January in Hilo?

In Hilo, in January, during 13.3 rainfall days, 2.72" (69mm) of precipitation is typically accumulated.

How warm is the water 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.

How many hours of daylight does Hilo have in January?

In January, the average day length in Hilo, Hawaii, is 11h and 6min.

What time are sunrise and sunset in January in Hilo?

On the first day of January, sunrise is at 6:54 am and sunset at 5:52 pm. On the last day of the month, sunrise is at 6:55 am and sunset at 6:11 pm HST.

How many hours of sunshine does Hilo have in January?

In January, the average sunshine duration is 7.9h.

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

January through April, with an average maximum UV index of 5, are months with the lowest UV index.

How high is the UV index in January in Hilo?

In Hilo, Hawaii, the average daily maximum UV index in January is 5. A UV Index estimate of 3 to 5 represents a medium hazard to health from exposure to Sun's UV rays.
Today
Tomorrow
Long-term
YearJanuaryFMAMJJASOND
Dec
January
Feb
Average high temperature
71.6°F 22°C
70.9°F 21.6°C
70.2°F 21.2°C
Average low temperature
66.4°F 19.1°C
64.8°F 18.2°C
64.2°F 17.9°C
Average pressure
29.99" 762mmHg
30" 762mmHg
30.01" 762mmHg
Average wind speed
6.9mph 11.1km/h
7mph 11.3km/h
7.4mph 11.9km/h
Average max. wind speed
7.5mph 12.1km/h
7.6mph 12.2km/h
8mph 12.9km/h
Average wind speed gusts
9.6mph 15.4km/h
9.8mph 15.8km/h
10.1mph 16.3km/h
Average humidity
79%
78%
79%
Average rainfall
2.64" 67mm
2.72" 69mm
3.78" 96mm
Average rainfall days
18.4
13.3
16.7
Average sea temperature
76.8°F 24.9°C
76.5°F 24.7°C
75.9°F 24.4°C
Average daylight
11h 0min
11h 1min
11h 3min
Average sunshine
6h 3min
7h 5min
8h 2min
Average sunshine days
6.2
12.1
6
Average UV index
6
5
5
Average cloud cover
33%
26%
32%
Average visibility
6mi 9.7km
6mi 9.7km
6mi 9.7km

Average temperature in January
Hilo, HI

Average temperature in January - Hilo, HI
  • Average high temperature in January: 70.9°F

The warmest month (with the highest average high temperature) is August (75.4°F).
The month with the lowest average high temperature is March (69.6°F).

  • Average low temperature in January: 64.8°F

The month with the highest average low temperature is September (70°F).
The coldest month (with the lowest average low temperature) is March (64°F).

Average pressure in January
Hilo, HI

Average pressure in January - Hilo, HI
  • Average pressure in January: 30"Hg

The month with the highest atmospheric pressure is April (30.05"Hg).
The months with the lowest atmospheric pressure are September and October (29.97"Hg).

Average wind speed in January
Hilo, HI

Average wind speed in January - Hilo, HI
  • Average wind speed in January: 7mph

The windiest month (with the highest average wind speed) is August (7.6mph).
The calmest month (with the lowest average wind speed) is October (6.7mph).

Average humidity in January
Hilo, HI

Average humidity in January - Hilo, HI
  • Average humidity in January: 78%

The month with the highest relative humidity is March (80%).
The months with the lowest relative humidity are January, May, June and July (78%).

Average rainfall in January
Hilo, HI

Average rainfall in January - Hilo, HI
  • Average rainfall in January: 2.72"

The wettest month (with the highest rainfall) is February (3.78").
The driest month (with the least rainfall) is June (1.1").

Average rainfall days in January
Hilo, HI

Average rainfall days in January - Hilo, HI
  • Average rainfall days in January: 13.3 days

The month with the highest number of rainy days is March (22.9 days).
The month with the least rainy days is January (13.3 days).

Average sea temperature in January
Hilo, HI

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 / Average sunshine in January - Hilo, HI
  • Average daylight in January: 11h and 1min

The month with the longest days is June (Average daylight: 13h and 18min).
The month with the shortest days is December (Average daylight: 11h and 0min).

  • Average sunshine in January: 7h and 5min

The month with the most sunshine is June (Average sunshine: 10h and 54min).
The month with the least sunshine is December (Average sunshine: 6h and 30min).

Average sunshine days in January
Hilo, HI

Average sunshine days in January - Hilo, HI
  • Average sunshine days in January: 12.1 days

The month with the most sunshine days is January (12.1 days).
The month with the least sunshine days is August (1.8 days).

Average UV index in January
Hilo, HI

Average UV index in January - Hilo, HI
  • Average UV index in January: 5

The months with the highest UV index are May, June, July, August, September, October, November and December (UV index 6).
The months with the lowest UV index are January, February, March and April (UV index 5).

Average cloud cover in January
Hilo, HI

Average cloud cover in January - Hilo, HI
  • Average cloud cover in January: 26

The month with the most cloud cover is March (Cloud cover 42).
The month with the least cloud cover is January (Cloud cover 26).

Average visibility in January
Hilo, HI

Average visibility in January - Hilo, HI
  • Average visibility in January: 6mi

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

Hilo, Hawaii, USA

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