October weather forecast
Honolulu, HI

Waikiki beach with clear calm waters on the foot of Honolulu city, Hawaii, with the vast cityscape and mountains in the distance
Waikiki beach with clear calm waters on the foot of Honolulu city, Hawaii, with the vast cityscape and mountains in the distance

Weather in October

October, the same as September, is another warm autumn month in Honolulu, Hawaii, with an average temperature varying between 81°F (27.2°C) and 75.6°F (24.2°C).

Temperature

In Honolulu, the average high-temperature in October is almost the same as in September - a still moderately hot 81°F (27.2°C). In October, the average low-temperature is 75.6°F (24.2°C).

Heat index

In October, the average heat index is estimated at a tropical 86°F (30°C). Constant exposure and activity lead to possible fatigue. Prolonged exercise may result in heat cramps.
Note that heat index values are valued for light wind and location in the shade. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature', 'feels like', 'apparent temperature', or 'real feel', is what the temperature feels like to the human body when the air temperature is combined with the relative humidity. This effect is individual, with diverse people perceiving weather differently for numerous reasons (clothing, pregnancy, differences in body mass, height, and shape), and activity. Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.

Humidity

The average relative humidity in October in Honolulu, Hawaii, is 75%.

Rainfall

The wettest months are March and October, with an average 1.81" (46mm) of rainfall.

Ocean temperature

In Honolulu, the average seawater temperature in October is 80.1°F (26.7°C).
Note: For any water activity, surface water temperatures between 77°F (25°C) and 84.2°F (29°C) are considered as excellent and extremely pleasant for lengthened periods.

Daylight

In Honolulu, the average length of the day in October is 11h and 39min.
On the first day of the month, sunrise is at 6:22 am and sunset at 6:19 pm. On the last day of October, in Honolulu, sunrise is at 6:33 am and sunset at 5:56 pm HST.

Sunshine

In October, the average sunshine in Honolulu is 8.2h.

UV index

The months with the lowest UV index in Honolulu are January through June, October through December, with an average maximum UV index of 6. A UV Index estimate of 6 to 7 represents a high health hazard from unsafe exposure to UV radiation for the ordinary person.
Note: In October, the average maximum UV index of 6 translate into the following recommendations:
Take precautions against overexposure. Fair-skinned people may get burned in less than 20 minutes. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Beware! The strength of the UV rays is significantly increased by the reflection of the water and sand.
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FAQ

What is the temperature in October in Honolulu?

In Honolulu, in October, the average high-temperature is 81°F (27.2°C), and the average low-temperature is 75.6°F (24.2°C). in October, the average heat index (a.k.a. 'felt air temperature', 'apparent temperature'), which combines air temperature and relative humidity, is estimated at 86°F (30°C).

What is the average humidity in October in Honolulu?

The average relative humidity in October in Honolulu, Hawaii, is 75%.

What is the rainiest month in Honolulu?

The months with the most rainfall in Honolulu, Hawaii, are March and October, with an average 1.81" (46mm) of precipitation.

How many days does it rain in October in Honolulu?

In Honolulu, Hawaii, in October, it is raining for 18 days, with typically 1.81" (46mm) of accumulated precipitation.

How warm is the water in October in Honolulu?

In Honolulu, the average seawater temperature in October is 80.1°F (26.7°C). Water temperature between 77°F (25°C) and 84.2°F (29°C) is regarded as very warm and enjoyable by all. With these temperatures, water activities are pleasurable, without feeling uncomfortable for prolonged periods.

What is the average length of the day in October in Honolulu?

The average day length in October in Honolulu, Hawaii, is 11h and 39min.

When are sunrise and sunset in October in Honolulu?

On the first day of October in Honolulu, Hawaii, sunrise is at 6:22 am and sunset at 6:19 pm. On the last day of the month, sunrise is at 6:33 am and sunset at 5:56 pm HST.

How many hours of sunshine does Honolulu have in October?

In October, the average sunshine duration in Honolulu is 8.2h.

What is the month with the lowest UV index in Honolulu?

January through June, October through December, with an average maximum UV index of 6, are months with the lowest UV index in Honolulu, Hawaii.

What is the UV index reading in October in Honolulu?

The average daily maximum UV index in October in Honolulu, Hawaii, is 6. A UV Index of 6 to 7 symbolizes a high health risk from exposure to Sun's UV rays.

Average temperature in October
Honolulu, HI

Average temperature in October - Honolulu, HI
  • Average high temperature in October: 81°F

The warmest month (with the highest average high temperature) is September (81.5°F).
The months with the lowest average high temperature are February and March (75°F).

  • Average low temperature in October: 75.6°F

The month with the highest average low temperature is August (75.7°F).
The coldest month (with the lowest average low temperature) is February (69.1°F).

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Average pressure in October
Honolulu, HI

Average pressure in October - Honolulu, HI
  • Average pressure in October: 29.97"Hg

The month with the highest atmospheric pressure is April (30.06"Hg).
The months with the lowest atmospheric pressure are September and October (29.97"Hg).

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Average wind speed in October
Honolulu, HI

Average wind speed in October - Honolulu, HI
  • Average wind speed in October: 9.2mph

The windiest month (with the highest average wind speed) is July (12.1mph).
The calmest month (with the lowest average wind speed) is January (9mph).

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Average humidity in October
Honolulu, HI

Average humidity in October - Honolulu, HI
  • Average humidity in October: 75%

The months with the highest relative humidity are February and December (76%).
The months with the lowest relative humidity are April, May, September and November (74%).

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Average rainfall in October
Honolulu, HI

Average rainfall in October - Honolulu, HI
  • Average rainfall in October: 1.81"

The wettest months (with the highest rainfall) are March and October (1.81").
The driest month (with the least rainfall) is July (0.67").

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Average rainfall days in October
Honolulu, HI

Average rainfall days in October - Honolulu, HI
  • Average rainfall days in October: 18 days

The months with the highest number of rainy days are March and October (18 days).
The month with the least rainy days is January (12.6 days).

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Average sea temperature in October
Honolulu, HI

Average sea temperature in October - Honolulu, HI
  • Average sea temperature in October: 80°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).

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Average daylight in October /
Average sunshine in October
Honolulu, HI

Average daylight in October / Average sunshine in October - Honolulu, HI
  • Average daylight in October: 11h and 39min

The month with the longest days is June (Average daylight: 13h and 25min).
The month with the shortest days is December (Average daylight: 10h and 52min).

  • Average sunshine in October: 8h and 12min

The month with the most sunshine is June (Average sunshine: 10h and 48min).
The months with the least sunshine are November and December (Average sunshine: 6h and 30min).

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Average sunshine days in October
Honolulu, HI

Average sunshine days in October - Honolulu, HI
  • Average sunshine days in October: 6.3 days

The month with the most sunshine days is January (12.8 days).
The month with the least sunshine days is October (6.3 days).

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Average UV index in October
Honolulu, HI

Average UV index in October - Honolulu, HI
  • Average UV index in October: 6

The months with the highest UV index are July, August and September (UV index 7).
The months with the lowest UV index are January, February, March, April, May, June, October, November and December (UV index 6).

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Average cloud cover in October
Honolulu, HI

Average cloud cover in October - Honolulu, HI
  • Average cloud cover in October: 36

The month with the most cloud cover is March (Cloud cover 40).
The months with the least cloud cover are January and September (Cloud cover 33).

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Average visibility in October
Honolulu, HI

Average visibility in October - Honolulu, HI
  • Average visibility in October: 6mi

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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