October weather forecast and climate
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 a moderately hot autumn month in Honolulu, Hawaii, with temperature in the range of an average low of 75.6°F (24.2°C) and an average high of 81°F (27.2°C).

Temperature

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

Heat index

The average heat index is calculated to 85.5°F (29.7°C). Constant exposure and activity lead to possible fatigue. Prolonged exercise may result in heat cramps.
Take into consideration that the heat index values are calculated for shade and light wind conditions. With the exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel', 'feels like', 'apparent temperature', or 'felt air temperature', is a measure of how hot it feels when the actual air humidity is factored in. Additional factors like differences in body mass, height, and shape, clothing, pregnancy, and activity influence one's weather impression. Be aware that direct exposure to sunlight increases heat impact, and may raise the heat index additionally, 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

In October, the average relative humidity is 75%.

Rainfall

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

Ocean temperature

In Honolulu, in October, the average water temperature 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

The average length of the day in Honolulu is 11.6h.

Sunshine

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

UV index

January through June, October through December, with an average maximum UV index of 6, are months with the lowest UV index in Honolulu. A UV Index reading of 6 to 7 represents a high health hazard from the exposure to the Sun's 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. Protection against sun damage is needed. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. 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). The average heat index (a.k.a. 'real feel', 'felt air temperature'), that combines air temperature and relative humidity, in October is calculated to 85.5°F (29.7°C).

What is the average humidity in October in Honolulu?

In October, the average relative humidity in Honolulu is 75%.

How much does it rain in Honolulu in October?

In October, in Honolulu, Hawaii, the rain falls for 18 days. Throughout October, 1.81" (46mm) of precipitation is accumulated.

What is the wettest month in Honolulu?

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

How warm is the water in October in Honolulu?

In October, the average ocean temperature in Honolulu, Hawaii, is 80.1°F (26.7°C). 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.

How many hours of daylight does Honolulu have in October?

The average length of the day in October in Honolulu is 11.6h.

How many hours of sunshine does Honolulu have in October?

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

What are the months with the lowest UV index in Honolulu?

Months with the lowest UV index are January through June, October through December, with an average maximum UV index of 6.

What is the UV index intensity in October in Honolulu?

In October, the average daily maximum UV index in Honolulu is 6. A UV Index of 6 to 7 symbolizes a high health vulnerability from unprotected exposure to the UV radiation.

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).
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"

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

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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%

Months with the highest relative humidity are February and December (76%).
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

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: 11.6h

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

  • Average sunshine in October: 8.2h

The month with the most sunshine is June (Average sunshine: 10.8h).
Months with the least sunshine are November and December (Average sunshine: 6.5).

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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

Months with the highest UV index are July, August and September (UV index 7).
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).
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

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

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