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

July weather forecast and climate
Hilo, HI

July, like June, in Hilo, Hawaii, is a moderately hot summer month, with average temperature varying between 82.8°F (28.2°C) and 69.3°F (20.7°C).

Temperature

In July, the average high-temperature is practically the same as in June - a still moderately hot 82.8°F (28.2°C). In July, in Hilo, the average low-temperature is 69.3°F (20.7°C).

Humidity

In July, the average relative humidity is 79.5%.

Rainfall

In July, the rain falls for 26.8 days. Throughout July, 5.7" (146mm) of precipitation is accumulated. Throughout the year, there are 272.1 rainfall days, and 84.4" (2144mm) of precipitation is accumulated.

Ocean temperature

In July, the average ocean temperature in Hilo, Hawaii, is 78.4°F (25.8°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.

Daylight

In July, the average length of the day in Hilo is 13.2h.

Sunshine

The average sunshine in Hilo is 5.4h.

UV index

March through September, with an average maximum UV index of 12, are months with the highest UV index in Hilo. A UV Index of 11, and more, symbolizes an excessive health risk from the exposure to the Sun's UV radiation for average individuals.
The average daily UV index of 12 transform into the following instructions:
Take all necessary precautions, as unprotected skin can burn in 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. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. 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 July in Hilo?

In Hilo, Hawaii, in July, the average high-temperature is 82.8°F (28.2°C), and the average low-temperature is 69.3°F (20.7°C).

What is the average humidity in July in Hilo?

In July, the average relative humidity is 79.5%.

How much does it rain in Hilo in July?

In July, in Hilo, the rain falls for 26.8 days. Throughout July, 5.7" (146mm) of precipitation is accumulated.

How warm is the water in July in Hilo?

In Hilo, in July, the average water temperature is 78.4°F (25.8°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.

What is the average length of the day in July in Hilo?

The average length of the day in July in Hilo, Hawaii, is 13.2h.

How long on average sun shines in July in Hilo?

In Hilo, the average sunshine in July is 5.4h.

What are the months with the highest UV index in Hilo?

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

How high is the UV index in July in Hilo?

The average daily maximum UV index in July in Hilo, Hawaii, is 12. A UV Index reading of 11, and higher, represents an extreme health threat from unprotected exposure to the UV radiation.
Average temperature in July - Hilo, HI
  • Average high temperature in July: 82.8°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 July: 69.2°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 July - Hilo, HI
  • Average humidity in July: 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 July - Hilo, HI
  • Average rainfall in July: 5.7"

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 July - Hilo, HI
  • Average rainfall days in July: 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 July - Hilo, HI
  • Average sea temperature in July: 78.4°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 July / Average sunshine in July - Hilo, HI
  • Average daylight in July: 13.2h

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 July: 5.4h

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 July - Hilo, HI
  • Average UV index in July: 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).