The highest day temperature in January 2026 was 83°F. The lowest night temperature was 64°F. The average values for day and night temperatures during January were 77.1°F и 69.1°F respectivly.

The average sea surface temperature in January 2026 for Oahu was 79.0°F. The maximum and minimum values were 78.0°F and 79.8°F respectively.

Most of the days in January are gloomy but you can also expect sunny days.

Precipitation total in January for Oahu is 0.6 in. It makes january one of the most rainy months of the year.

The average wind speed in January is 8.7 mph. It makes January one of the most windless months of the year for Oahu.

We are using day length and cloud cover information for each day of the month to calculate averages for this chart. Average sunny hours for Oahu in January is 5.7 hours.