July weather forecast
Waipahu, HI

July in Waipahu, Hawaii is the warmest month on the calendar, with the maximum temperature scaling up to a comfortable 81.1°F (27.3°C). The transition to summer is now complete, with the prevalence of warm and sunny days, and the sea temperature touching 79.2°F (26.2°C). Longer daylight hours continue to allow plenty of time for outdoor activities, with average sunshine hours reaching 9.3. Despite the warm weather, Hawaii's wind does not let up, with July recording a gust speed of 14.9mph (24km/h). Along with the warming trend, this is also typically the driest month of the year, with only 0.71" (18mm) of rainfall on average.

Temperature

The onset of July brings with it an average high-temperature of a still moderately hot 81.1°F (27.3°C), showing a negligible variation from the month before. Waipahu logs an average low-temperature of 74.5°F (23.6°C) during the nights of July, subtly lower than its daytime highs.

Heat index

July's heat index is computed to be a hot 86°F (30°C). Continuous exposure and activity could induce a sense of tiredness and subsequently, heat cramps.
Be advised, the heat index considers values for conditions in shade and with a light breeze. The heat index has the potential to rise by 15 Fahrenheit (8 Celsius) degrees with direct sunshine exposure.
Note: The heat index, also known as 'real feel' or 'apparent temperature', is an aggregate value of air's warmth and moisture to show the human-felt temperature. Depending on the activity and the individual's heat perception, which may vary due to factors including wind, clothing, and metabolic variations, this effect remains subjective. In direct sunlight, the heat's impact can be heightened, potentially leading to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are largely significant for babies and toddlers. Kids often lack the knowledge about the necessity to take breaks and consume liquids. Thirst, as a late symptom of dehydration, necessitates the maintenance of hydration, particularly during enduring physical activities.

Humidity

In Waipahu, the average relative humidity in July is 75%.

Rainfall

July is the month with the least rainfall. Rain falls for 16.4 days and accumulates 0.71" (18mm) of precipitation.

Ocean temperature

In Waipahu, Hawaii, in July, the average water temperature is 79.3°F (26.3°C).
Note: For water activities like swimming, diving, and more, temperatures ranging between 77°F (25°C) and 84.2°F (29°C) offer superior comfort and enjoyment for lengthy durations.

Daylight

In July, the average length of the day is 13h and 17min.
On the first day of July, sunrise is at 5:53 am and sunset at 7:18 pm. On the last day of the month, sunrise is at 6:05 am and sunset at 7:11 pm HST.

Sunshine

In Waipahu, the average sunshine in July is 9.3h.

UV index

The months with the lowest UV index are January through August, 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 exposure to the Sun's UV rays for average individuals.
Note: A maximum UV index of 6 in July translates into the following recommendations:
Take precautions against overexposure. Protection against sun damage is needed. The Sun's UV radiation is at its strongest between the hours of 10 a.m. and 4 p.m. Minimize direct exposure to the sun during this period. To best shield against UV radiation, choose sun-safe garments and dependable sunglasses. Warning! Reflective surfaces like sand and water amplify the Sun's UV radiation.