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 average high-temperature for July is a still moderately hot 81.1°F (27.3°C), closely aligning with the temperature of the preceding month. Waipahu maintains a consistent average nighttime low-temperature of 74.5°F (23.6°C) throughout July.

Heat index

Throughout July, the heat index is appraised at a hot 86°F (30°C). Ongoing exposure and activity could lead to a state of exhaustion, with a chance of heat cramps.
In terms of the heat index, values are set with light wind and shade conditions in mind. 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 'apparent temperature' or 'feels like', is an aggregate value of air's warmth and moisture to show the human-felt temperature. The influence of weather can be personal, changing with an individual's body mass, height, and level of physical exertion. Direct sun exposure is noteworthy in its ability to escalate the felt temperature, potentially adding 15 Fahrenheit (8 Celsius) degrees to the heat index. Heat index values hold particular significance for children. Children often lack awareness of the importance of taking breaks and rehydrating. The feeling of thirst is a late indication of dehydration, so maintaining hydration, especially during long periods of physical activity, is critical.

Humidity

In July, the average relative humidity is 75%.

Rainfall

The month with the least rainfall in Waipahu is July, when the rain falls for 16.4 days and typically collects 0.71" (18mm) of precipitation.

Ocean temperature

In July, the average ocean temperature in Waipahu is 79.3°F (26.3°C).
Note: Water temperatures between 77°F (25°C) and 84.2°F (29°C) are ideal for all water activities, offering enjoyment without causing discomfort over extended periods.

Daylight

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

Sunshine

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 reading of 6 to 7 represents a high health hazard from exposure to the Sun's UV rays for average individuals.
Note: The maximum daily UV index of 6 in July interprets into the following recommendations:
Avoid overexposure. Fair-skinned individuals can burn in under 20 minutes. Avoid exposure to the Sun and try to stay in the shade between 10 a.m. and 4 p.m., when UV radiation is most potent, but be aware that parasols or canopies may not offer full protection. Select sunglasses that boast both UVA and UVB protection to limit the adverse effects of the sun on the eyes. Stay cautious! Sand and water reflections increase UV radiation potency.