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

August weather forecast and climate
Hilo, HI

August, the last month of the summer, in Hilo, is also a moderately hot month, with temperature in the range of an average high of 83.1°F (28.4°C) and an average low of 69.3°F (20.7°C).

Temperature

In August, the average high-temperature is almost the same as in July - a still warm 83.1°F (28.4°C). In August, the average low-temperature is 69.3°F (20.7°C).

Humidity

In Hilo, the average relative humidity in August is 79.5%.

Rainfall

In Hilo, during 26.8 rainfall days, 5.9" (149mm) of precipitation is typically accumulated. In Hilo, Hawaii, during the entire year, the rain falls for 272.1 days and collects up to 84.4" (2144mm) of precipitation.

Ocean temperature

In Hilo, the average water temperature is 79.2°F (26.2°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.

Daylight

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

Sunshine

In Hilo, the average sunshine is 5.6h.

UV index

Months with the highest UV index are March through September, with an average maximum UV index of 12. A UV Index reading of 11, and higher, represents an extreme health hazard from unsafe exposure to the UV radiation for average individuals.
The average daily UV index of 12 transform into the following instructions:
Practice all essential precautions. Protection against sun damage is crucial. 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. A broad-spectrum sunscreen of SPF 30+ should be liberally applied and re-applied every two hours, and immediately after an outdoor workout or a swim. Beware! The strength of the UV rays is significantly increased by the reflection of the water and sand.

What is the temperature in August in Hilo?

In Hilo, in August, the average high-temperature is 83.1°F (28.4°C), and the average low-temperature is 69.3°F (20.7°C).

What is the average humidity in August in Hilo?

In August, the average relative humidity in Hilo, Hawaii, is 79.5%.

How many days does it rain in August in Hilo?

In Hilo, Hawaii, during August, the rain falls for 26.8 days and regularly aggregates up to 5.9" (149mm) of precipitation.

What is the ocean temperature in August in Hilo?

In Hilo, in August, the average water temperature is 79.2°F (26.2°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 Hilo?

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

How long on average sun shines in August in Hilo?

In August, the average sunshine in Hilo, Hawaii, is 5.6h.

When is the highest UV index in Hilo?

March through September, with an average maximum UV index of 12, are months with the highest UV index in Hilo.

How high is the UV index in August in Hilo?

The average daily maximum UV index in August in Hilo, Hawaii, is 12. A UV Index value of 11, and more, symbolizes an excessive health risk from the exposure to the Sun's UV radiation.
Average temperature in August - Hilo, HI
  • Average high temperature in August: 83.2°F

The warmest month (with the highest average high temperature) is September (83.3°F).
The month with the lowest average high temperature is February (78.8°F).

  • Average low temperature in August: 69.3°F

The month with the highest average low temperature is September (69.7°F).
The coldest month (with the lowest average low temperature) is February (63.5°F).

Average humidity in August - Hilo, HI
  • Average humidity in August: 79.5%

The month with the highest relative humidity is November (80.3%).
The month with the lowest relative humidity is February (76%).

Average rainfall in August - Hilo, HI
  • Average rainfall in August: 5.9"

The wettest month (with the highest rainfall) is March (10.6").
The driest month (with the lowest rainfall) is June (4.3").

Average rainfall days in August - Hilo, HI
  • Average rainfall days in August: 26.8 days

Months with the highest number of rainy days are July and August (26.8 days).
The month with the lowest number of rainy days is February (15.8 days).

Average sea temperature in August - Hilo, HI
  • Average sea temperature in August: 79.1°F

The best month for swimming (with the highest average sea temperature) is September (79.3°F).
The coldest month (with the lowest average sea temperature) is March (75.7°F).

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

The month with the longest days is June (Average daylight: 13.3h).
The month with shortest days is December (Average daylight: 11h).

  • Average sunshine in August: 5.6h

The month with most sunshine is June (Average sunshine: 5.9h).
The month with least sunshine is November (Average sunshine: 3.8h).

Average UV index in August - Hilo, HI
  • Average UV index in August: 12

Months with the highest UV index are March, April, May, June, July, August and September (UV index 12).
The month with the lowest UV index is December (UV index 7).