Monthly weather forecast and climate
Honolulu, HI

Contents

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

The climate of Honolulu, HI

Honolulu, the capital city of Hawaii State, experiences a tropical hot semi-arid climate classified as Bsh under the Köppen climatic classification.

Characterized by a warm and relatively dry summer and rainy but sunny winter, Honolulu has an annual average humidity of 68.0%. Most of the rain falls in winter and averages 17" (431.8mm) annually from an average of 90 rainy days of the entire year, although in summer a few showers may also be experienced.
It is generally sunny in Honolulu, with an average of 278 sunny days during the year.

Summer temperatures are hot, scorching, and dry and range between 69.8°F (21°C) and 89.6°F (32°C) with an average of eleven hours of sunshine in most days. It is mostly cloudy in summer, and the wind speed goes up to 16.5mph (26.6km/h).

Winters, are pleasant, wet and humid with a temperature range between 66.2°F (19°C) and 80.6°F (27°C) and an average of nine sunshine hours in most of the days. Winter skies are always almost clear, and the wind speed is relatively low, blowing at an average of 12.3mph (19.8km/h).

The best time to visit Honolulu, HI

The best time to visit Honolulu, Hawaii is incontestably the winter, when the weather is pleasant and warm, and the ocean temperature is ranging between 75.2°F (24°C) and 78.1°F (25.6°C). This is perfect weather for sea activities and any outdoor indulging.
Most tourists visit Honolulu during winter in order to escape the extremely low winter temperatures in other US cities. The skies are clear, and the sun shines almost all day long. Expect rainfall in winter, albeit without altering the pleasant weather.

The worst time to visit Honolulu, HI

Honolulu is generally a warm city. There is not a reasonable wrong time to visit the city. However, visiting Honolulu during summer has significant setbacks that may be hard to get around for most people.
The worst is the massive crowd of people in every single spot. From the beaches to the hotels, and even the streets there are flock crowds of people enjoying the summer heat. For lovers of peace, the summer would be the wrong time to visit the city, considering that the schools are closed, and the children are all over. It gets stuffy, crowded, and noisy everywhere.

Weather in January

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).
Weather in January »

Weather in February

The weather remains pleasant and favorable in February with the lowest temperatures reading steadily at 66.2°F (19°C) and the highest remaining steady at 80.6°F (27°C).
Weather in February »

Weather in March

March in Honolulu is characterized by temperatures ranging between 68°F (20°C) at the lowest point, and the highest score steadies on at an average of 80.6°F (27°C).
Weather in March »

Weather in April

The temperatures rise to read an average between 69.8°F (21°C) and 82.4°F (28°C) getting warmer with the sunshine hours sitting steady at an average of nine per day.
Weather in April »

Weather in May

May in Honolulu is a transitional month into summer and is characterized by a further drop in humidity to 64% and a rise in temperatures with the lowest reading averaging 71.6°F (22°C) and the highest at 84.2°F (29°C).
Weather in May »

Weather in June

The temperatures shoot up to read between 73.4°F (23°C) and 87.8°F (31°C), making it hotter than it was in the past few months. Humidity drops to 63%, and so does the rainfall.
Weather in June »

Weather in July

The sunshine hours per day are steady at eleven, heating the ocean temperatures to a constant 26°. The temperatures rise further to read 75.2°F (24°C) at the lowest point and a constant 87.8°F (31°C) at its highest point.
Weather in July »

Weather in August

Temperatures are extremely high with the highest reading 89.6°F (32°C) and the lowest reading of 75.2°F (24°C). Rainfall in August takes a slight rise to an average of 0.5" (12.7mm).
Weather in August »

Weather in September

September is still hot with steady temperatures at 75.2°F (24°C) at its coldest and 89.6°F (32°C) at its warmest. The amount of rain increase during the month, raining for an average of eleven days to collect at 0.6" (15.2mm).
Weather in September »

Weather in October

The temperature in October reads an average between 73.4°F (23°C) and 87.8°F (31°C), a slight drop from the previous month as the cold season is approaching. This is a great time to enjoy the warm ocean waters.
Weather in October »

Weather in November

November is relatively colder as the temperatures drop to a warm and still pleasant 71.6°F (22°C) when it is coolest and read 84.2°F (29°C) when it is warmest.
Weather in November »

Weather in December

December is characterized by pleasantly warm temperatures between 68°F (20°C) and 80.6°F (27°C). It is not as hot as during the summer, but it is favorable for every outdoor engagement.
Weather in December »

FAQ

What is the coldest month in Honolulu?

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

What is the most humid month in Honolulu?

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

How many days does it rain in Honolulu?

Throughout the year, in Honolulu, there are 89.4 rainfall days, and 109.3" (2776mm) of precipitation is accumulated.

What is the rainiest month in Honolulu?

March is the month with the most rainfall. Rain falls for 8.8 days and accumulates 11.5" (291mm) of precipitation.

What month is the ocean coldest in Honolulu?

The month with the coldest seawater is March, with an average ocean temperature of 75.7°F (24.3°C). A person's cold intolerance, with sunshine, wind, and air temperature, are essential factors for enjoying swimming in 75.7°F (24.3°C) water. (FYI: The Olympic swimming competition requires a water temperature between 77°F (25°C) and 82.4°F (28°C).)

What is the driest month in Honolulu?

The month with the least rainfall in Honolulu is June when the rain falls for 5.7 days and typically collects 6.2" (158mm) of precipitation.

When are the longest days in Honolulu?

With an average of 13.4h of daylight, June has the longest days of the year in Honolulu, Hawaii.

When is the highest UV index in Honolulu?

Months with the highest UV index are June through August, with an average UV index of 12.

What month has the most sunshine in Honolulu?

July has the most sunshine of the year in Honolulu, Hawaii, with an average of 9.9h of sunshine.

What is the warmest month in Honolulu?

August is the warmest month, with an average high-temperature of 88.7°F (31.5°C) and an average low-temperature of 75°F (23.9°C).

What is the least humid month in Honolulu?

August is the least humid month, with an average relative humidity of 64.1%.

What month is the ocean warmest in Honolulu?

September is the month with the warmest seawater, with an average ocean temperature of 80.4°F (26.9°C). For swimming, diving, and other water activities, temperatures between 77°F (25°C) and 84.2°F (29°C) are perceived as very enjoyable and pleasurable for prolonged periods without feeling uncomfortable.

What is the month with the shortest days in Honolulu?

With an average of 10.9h of daylight, December has the shortest days of the year in Honolulu.

What is the month with the least sunshine in Honolulu?

With an average of 6.4h of sunshine, December has the least sunshine of the year.

When is the lowest UV index in Honolulu?

The month with the lowest UV index is December, with an average UV index of 6.

Average temperature
Honolulu, HI

Average temperature - Honolulu, HI

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).

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
Honolulu, HI

Average humidity - Honolulu, HI

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

Average rainfall
Honolulu, HI

Average rainfall - Honolulu, HI

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
Honolulu, HI

Average rainfall days - Honolulu, HI

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
Honolulu, HI

Average sea temperature - Honolulu, HI

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 / Average sunshine
Honolulu, HI

Average daylight / Average sunshine - Honolulu, HI

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

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
Honolulu, HI

Average UV index - Honolulu, HI

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).

°Celsius°Fahrenheit
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