Honolulu
Hawaii, USA
Long-term weather forecast
Long-term weather forecast

October weather forecast and climate
Honolulu, HI

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
October, like September, in Honolulu, Hawaii, is another warm autumn month, with 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 warm 81°F (27.2°C). The average low-temperature, in October, is 75.6°F (24.2°C).

Heat index

In October, the average heat index is calculated to 85.5°F (29.7°C). Exhaustion is likely with prolonged exposure and activity. Sustaining activity 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 'apparent temperature', 'real feel', 'felt air temperature', or 'feels like', is a calculated temperature value of how hot it feels when the moisture in the air is factored in. Additional factors like activity, wind, pregnancy, and metabolic differences affect individual temperature impact. 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. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it is vital to remain hydrated, particularly during prolonged physical activities.

Humidity

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

Rainfall

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

Ocean temperature

In Honolulu, the average water temperature is 80.1°F (26.7°C).
Note: 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.

Daylight

In October, the average length of the day in Honolulu, Hawaii, is 11.6h.

Sunshine

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

UV index

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 risk from the exposure to the Sun's UV rays for ordinary individuals.
Note: The average daily UV index of 6 transform into the following instructions:
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.

What is the temperature in October 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. 'apparent temperature', 'felt air temperature'), that factores the actual air temperature with the relative humidity, in October is evaluated at 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 many days does it rain in October in Honolulu?

In Honolulu, in October, during 18 rainfall days, 1.81" (46mm) of precipitation is typically accumulated.

What is the wettest month in Honolulu?

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

How warm is the water in October in Honolulu?

In Honolulu, in October, the average water temperature is 80.1°F (26.7°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.

How many hours of daylight does Honolulu have in October?

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

How long on average sun shines in October in Honolulu?

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

When is 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 reading in October in Honolulu?

The average daily maximum UV index in October is 6. A UV Index reading of 6 to 7 represents a high hazard to health from unsafe exposure to the Sun's UV rays.
Average temperature in October - Honolulu, HI
  • Average high temperature in October: 27.2°C

The warmest month (with the highest average high temperature) is September (27.5°C).
Months with the lowest average high temperature are February and March (23.9°C).

  • Average low temperature in October: 24.2°C

The month with the highest average low temperature is August (24.3°C).
The coldest month (with the lowest average low temperature) is February (20.6°C).

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%).

Average rainfall in October - Honolulu, HI
  • Average rainfall in October: 46mm

Wettest months (with the highest rainfall) are March and October (46mm).
The driest month (with the lowest rainfall) is July (17mm).

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 lowest number of rainy days is January (12.6 days).

Average sea temperature in October - Honolulu, HI
  • Average sea temperature in October: 26.7°C

The best month for swimming (with the highest average sea temperature) is September (26.9°C).
The coldest month (with the lowest average sea temperature) is March (24.3°C).

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 shortest days is December (Average daylight: 10.9h).

  • Average sunshine in October: 8.2h

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

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).