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

August weather forecast and climate
Waimalu, HI

August, the last month of the summer, in Waimalu, is another warm month, with average temperature fluctuating between 74.8°F (23.8°C) and 82°F (27.8°C).

Temperature

August and September, with an average high-temperature of 82°F (27.8°C), are the warmest months.

Heat index

In August, the average heat index is estimated at a hot 87.6°F (30.9°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. 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', 'apparent temperature', 'real feel', or 'feels like', is what the temperature feels like to the human body when the air temperature is combined with the relative humidity. Additional factors like activity, metabolic differences, wind, and clothing 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. 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 August, the average relative humidity in Waimalu is 75%.

Rainfall

In Waimalu, during 16.8 rainfall days, 1.02" (26mm) of precipitation is typically accumulated. Throughout the year, in Waimalu, Hawaii, there are 208.4 rainfall days, and 16.5" (419mm) of precipitation is accumulated.

Ocean temperature

August through October, with an average ocean temperature of 80.6°F (27°C), are months with the warmest seawater.
Note: 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.

Daylight

The average length of the day in August is 12.8h.

Sunshine

In August, the average sunshine in Waimalu is 8.3h.

UV index

January through August, October through December, with an average maximum UV index of 6, are months with the lowest UV index. A UV Index of 6 to 7 symbolizes a high health vulnerability from the exposure to the Sun's UV radiation for the average person.
Note: The average daily UV index of 6 transform into the following instructions:
Take precautions and adopt sun safety practices. Protection against sunburn is obliged. 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. A wide-brim hat offers excellent sun protection for 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.

What are the warmest months in Waimalu?

August and September, with an average high-temperature of 82°F (27.8°C), are warmest months in Waimalu, Hawaii.

What is the temperature in August in Waimalu?

In August, in Waimalu, Hawaii, the average high-temperature is 82°F (27.8°C), and the average low-temperature is 74.8°F (23.8°C). In August, the average heat index (a.k.a. 'feels like', 'felt air temperature'), that combines both air temperature and relative humidity, is calculated to 87.6°F (30.9°C).

What is the average humidity in August in Waimalu?

In August, the average relative humidity in Waimalu is 75%.

How much does it rain in Waimalu in August?

In August, in Waimalu, Hawaii, the rain falls for 16.8 days. Throughout August, 1.02" (26mm) of precipitation is accumulated.

When is the ocean warmest in Waimalu?

August through October, with an average ocean temperature of 80.6°F (27°C), are months with the warmest seawater in Waimalu.

How warm is the water in August in Waimalu?

In Waimalu, Hawaii, in August, the average water temperature is 80.6°F (27°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.

What is the average length of the day in August in Waimalu?

In Waimalu, the average length of the day in August is 12.8h.

How long on average sun shines in August in Waimalu?

The average sunshine in August in Waimalu is 8.3h.

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

Months with the lowest UV index in Waimalu, Hawaii, are January through August, October through December, with an average maximum UV index of 6.

What is the UV index intensity in August in Waimalu?

In August, the average daily maximum UV index in Waimalu, Hawaii, is 6. A UV Index of 6 to 7 symbolizes a high hazard to health from unsafe exposure to the Sun's UV rays.
Average temperature in August - Waimalu, HI
  • Average high temperature in August: 82°F

The warmest months (with the highest average high temperature) are August and September (82°F).
Months with the lowest average high temperature are February and March (75.4°F).

  • Average low temperature in August: 74.8°F

The month with the highest average low temperature is September (75°F).
The coldest month (with the lowest average low temperature) is February (68°F).

Average humidity in August - Waimalu, HI
  • Average humidity in August: 75%

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

Average rainfall in August - Waimalu, HI
  • Average rainfall in August: 1.02"

The wettest month (with the highest rainfall) is October (2.09").
The driest month (with the least rainfall) is July (0.71").

Average rainfall days in August - Waimalu, HI
  • Average rainfall days in August: 16.8 days

The month with the highest number of rainy days is March (20 days).
The month with the least rainy days is January (13.5 days).

Average sea temperature in August - Waimalu, HI
  • Average sea temperature in August: 81°F

The best months for swimming (with the highest average sea temperature) are August, September and October (81°F).
The coldest months (with the lowest average sea temperature) are January, February, March and April (75°F).

Average daylight in August / Average sunshine in August - Waimalu, HI
  • Average daylight in August: 12.8h

The month with the longest days is June (Average daylight: 13.4h).
The month with the shortest days is December (Average daylight: 10.8h).

  • Average sunshine in August: 8.3h

The month with the most sunshine is June (Average sunshine: 9.9h).
Months with the least sunshine are November and December (Average sunshine: 6.3).

Average UV index in August - Waimalu, HI
  • Average UV index in August: 6

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