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.
  • Average high temperature in January: 80.1°F

The warmest month (with the highest average high temperature) is August (88.7°F).
The month with the lowest average high temperature is January (80.1°F).

  • Average low temperature in January: 66.3°F

The month with the highest average low temperature is August (75.1°F).
The coldest month (with the lowest average low temperature) is February (66.1°F).

  • 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: 9.4"

The wettest month (with the highest rainfall) is March (11.5").
The driest month (with the lowest rainfall) is June (6.2").

  • 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: 76.6°F

The best month for swimming (with the highest average sea temperature) is September (80.4°F).
The coldest month (with the lowest average sea temperature) is March (75.7°F).

  • Average daylight in January: 11.8h

The month with the longest days is June (Average daylight: 14.2h).
The month with shortest days is December (Average daylight: 11.7h).

  • 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: 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).

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