Oahu Weather by Month — Temperature & Rainfall Guide

Oahu is a region in the United States of America. Many people wonder what the weather conditions are in Oahu over the year. What is the best time to visit Oahu?

This page shows the average weather conditions by month in Oahu over the year in: January, February, March, April, May, June, July, August, September, October, November, December.

In January the weather in Oahu is generally perfect. In Honolulu you can expect warm maximum average daytime temperatures around 25°C (77°F) and nighttime temperatures around 21°C (70°F).

Find more detailed climate information for Oahu in January here.

In February the weather in Oahu is generally perfect. In Honolulu you can expect warm maximum average daytime temperatures around 25°C (77°F) and nighttime temperatures around 21°C (70°F). On average, this month is the coldest month of the year in Oahu.

Find more detailed climate information for Oahu in February here.

In March the weather in Oahu is generally perfect. In Honolulu you can expect warm maximum average daytime temperatures around 25°C (77°F) and nighttime temperatures around 21°C (70°F).

Find more detailed climate information for Oahu in March here.

In April the weather in Oahu is generally perfect. In Honolulu you can expect warm maximum average daytime temperatures around 26°C (79°F) and nighttime temperatures around 22°C (72°F).

Find more detailed climate information for Oahu in April here.

In May the weather in Oahu is generally perfect. In Honolulu you can expect warm maximum average daytime temperatures around 27°C (81°F) and nighttime temperatures around 23°C (73°F).

Find more detailed climate information for Oahu in May here.

In June the weather in Oahu is generally perfect. In Honolulu you can expect warm maximum average daytime temperatures around 28°C (82°F) and nighttime temperatures around 23°C (73°F).

Find more detailed climate information for Oahu in June here.

In July the weather in Oahu is generally perfect. In Honolulu you can expect warm maximum average daytime temperatures around 28°C (82°F) and nighttime temperatures around 24°C (75°F).

Find more detailed climate information for Oahu in July here.

In August the weather in Oahu is generally perfect. In Honolulu you can expect warm maximum average daytime temperatures around 29°C (84°F) and nighttime temperatures around 24°C (75°F). On average, this month is one of the warmest months of the year in Oahu. So be prepared and make sure to dress lightly.

Find more detailed climate information for Oahu in August here.

In September the weather in Oahu is generally perfect. In Honolulu you can expect warm maximum average daytime temperatures around 29°C (84°F) and nighttime temperatures around 24°C (75°F). On average, this month is one of the warmest months of the year in Oahu. So be prepared and make sure to dress lightly.

Find more detailed climate information for Oahu in September here.

In October the weather in Oahu is generally perfect. In Honolulu you can expect warm maximum average daytime temperatures around 28°C (82°F) and nighttime temperatures around 24°C (75°F).

Find more detailed climate information for Oahu in October here.

In November the weather in Oahu is generally perfect. In Honolulu you can expect warm maximum average daytime temperatures around 27°C (81°F) and nighttime temperatures around 23°C (73°F).

Find more detailed climate information for Oahu in November here.

In December the weather in Oahu is generally perfect. In Honolulu you can expect warm maximum average daytime temperatures around 26°C (79°F) and nighttime temperatures around 22°C (72°F).

Find more detailed climate information for Oahu in December here.