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

January weather forecast and climate
Honolulu, HI

Waikiki beach viewed from above, with clear calm waters on the foot of Honolulu city, Hawaii, with the vast cityscape and mountains in the distance
Waikiki beach viewed from above, with clear calm waters on the foot of Honolulu city, Hawaii, with the vast cityscape and mountains in the distance
January weather in Honolulu is a pleasant way to start the year. Humidity is at 74%, and the temperatures are mildly warm, averaging between 66.2°F (19°C) and 80.6°F (27°C). The sun is up most of the day for up to eight hours, making the ocean warm up to read 77°F (25°C) and the days warm for outdoor activities even as it remains the coldest month of the year. Rainfall in January is the highest all year, and it falls for an average of fourteen days with the rain gauge reading an average of 2.4" (61mm) during the month.

What is the coldest month in Honolulu?

January is the coldest month, with an average high-temperature of 80.1°F (26.7°C) and an average low-temperature of 66.4°F (19.1°C).

What is the temperature in January in Honolulu?

In Honolulu, in January, the average high-temperature is 80.1°F (26.7°C), and the average low-temperature is 66.4°F (19.1°C).

What is the most humid month in Honolulu?

The most humid month in Honolulu, Hawaii, is January, with an average relative humidity of 73.3%.

What is the average humidity in January in Honolulu?

In January, the average relative humidity in Honolulu, Hawaii, is 73.3%.

How many days does it rain in January in Honolulu?

In Honolulu, in January, it is raining for 8.5 days, with typically 9.4" (239mm) of accumulated precipitation.

What is the ocean temperature in January in Honolulu?

In Honolulu, Hawaii, the average seawater temperature in January 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 Honolulu?

In Honolulu, Hawaii, the average length of the day in January is 11h.

How many hours of sunshine does Honolulu have in January?

In Honolulu, the average sunshine in January is 6.9h.

How high is the UV index in January in Honolulu?

In Honolulu, Hawaii, the average daily maximum UV index in January is 7. A UV Index reading of 6 to 7 represents a high health threat from unprotected exposure to the UV radiation.
Average temperature in January - Honolulu, HI
  • Average high temperature in January: 26.7°C

The warmest month (with the highest average high temperature) is August (31.5°C).
The month with the lowest average high temperature is January (26.7°C).

  • Average low temperature in January: 19.1°C

The month with the highest average low temperature is August (23.9°C).
The coldest month (with the lowest average low temperature) is February (18.9°C).

Average humidity in January - Honolulu, HI
  • Average humidity in January: 73.3%

The month with the highest relative humidity is January (73.3%).
The month with the lowest relative humidity is August (64.1%).

Average rainfall in January - Honolulu, HI
  • Average rainfall in January: 239mm

The wettest month (with the highest rainfall) is March (291mm).
The driest month (with the lowest rainfall) is June (158mm).

Average rainfall days in January - Honolulu, HI
  • Average rainfall days in January: 8.5 days

The month with the highest number of rainy days is December (9.7 days).
The month with the lowest number of rainy days is August (5.6 days).

Average sea temperature in January - Honolulu, HI
  • Average sea temperature in January: 24.8°C

The best month for swimming (with the highest average sea temperature) is September (26.9°C).
The coldest month (with the lowest average sea temperature) is March (24.3°C).

Average daylight in January / Average sunshine in January - Honolulu, HI
  • Average daylight in January: 11h

The month with the longest days is June (Average daylight: 13.4h).
The month with shortest days is December (Average daylight: 10.9h).

  • Average sunshine in January: 6.9h

The month with most sunshine is July (Average sunshine: 9.9h).
The month with least sunshine is December (Average sunshine: 6.4h).

Average UV index in January - Honolulu, HI
  • Average UV index in January: 7

Months with the highest UV index are June, July and August (UV index 12).
The month with the lowest UV index is December (UV index 6).