July weather forecastHonolulu, HI
July
Weather in July
July in Honolulu presents the year's warmest weather conditions, where the temperatures rise to as high as 80.4°F (26.9°C), and the sea temperature reaches a soothing 79.1°F (26.2°C). The trend of reducing rainfall continues, making July one of the drier months. A noticeable increase in UV Index to 7 prompts cautious sun exposure and sun protection measures. Strong winds provide a refreshing break from the summer heat. July’s allure lies in its constant warm days, clear skies, and the captivating tropical scenery.Temperature
The arrival of July in Honolulu records an average high-temperature of a still moderately hot 80.4°F (26.9°C), closely related to the 79.5°F (26.4°C) observed in June. In Honolulu, the month of July brings a consistent average low-temperature of 75°F (23.9°C), slightly cooler than its daytime highs.Humidity
In July, the average relative humidity in Honolulu is 75%.Rainfall
The month with the least rainfall is July, when the rain falls for 16.4 days and typically collects 0.67" (17mm) of precipitation.Ocean temperature
In July, the average ocean temperature in Honolulu, Hawaii, is 79.2°F (26.2°C).Note: For swimming, diving, and similar activities, the water temperatures between 77°F (25°C) and 84.2°F (29°C) are considered delightful, allowing for extended periods of enjoyment without discomfort.
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 7:17 pm. On the last day of the month, sunrise is at 6:04 am and sunset at 7:10 pm HST.
Sunshine
The average sunshine in July is 9.9h.UV index
July through September, with an average maximum UV index of 7, are months with the highest UV index. A UV Index estimate of 6 to 7 represents a high health risk from exposure to the Sun's UV rays for ordinary individuals.Note: The maximum UV index of 7 during July leads to these instructions:
Persist with safeguards and heed sun safety doctrines. Keeping sunburn at bay is of prime importance. Limit your direct sun exposure, especially between 10 a.m. and 4 p.m., when UV radiation is strongest. Shade structures might not provide complete sun protection. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Caution! The Sun's UV rays become stronger due to reflections from water and sand.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in July
Honolulu, HI
- Average high temperature in July: 80.4°F
The warmest month (with the highest average high temperature) is September (81.5°F).
The months with the lowest average high temperature are February and March (75°F).
- Average low temperature in July: 75°F
The month with the highest average low temperature is August (75.7°F).
The coldest month (with the lowest average low temperature) is February (69.1°F).
Average pressure in July
Honolulu, HI
- Average pressure in July: 30.01"Hg
The month with the highest atmospheric pressure is April (30.06"Hg).
The months with the lowest atmospheric pressure are September and October (29.97"Hg).
Average wind speed in July
Honolulu, HI
- Average wind speed in July: 12.1mph
The windiest month (with the highest average wind speed) is July (12.1mph).
The calmest month (with the lowest average wind speed) is January (9mph).
Average humidity in July
Honolulu, HI
- Average humidity in July: 75%
The months with the highest relative humidity are February and December (76%).
The months with the lowest relative humidity are April, May, September and November (74%).
Average rainfall in July
Honolulu, HI
- Average rainfall in July: 0.67"
The wettest months (with the highest rainfall) are March and October (1.81").
The driest month (with the least rainfall) is July (0.67").
Average rainfall days in July
Honolulu, HI
- Average rainfall days in July: 16.4 days
The months with the highest number of rainy days are March and October (18 days).
The month with the least rainy days is January (12.6 days).
Average sea temperature in July
Honolulu, HI
- Average sea temperature in July: 79.1°F
The best month for swimming (with the highest average sea temperature) is September (80.4°F).
The coldest month (with the lowest average sea temperature) is March (75.7°F).
Average daylight in July /
Average sunshine in July
Honolulu, HI
- Average daylight in July: 13h and 18min
The month with the longest days is June (Average daylight: 13h and 24min).
The month with the shortest days is December (Average daylight: 10h and 54min).
- Average sunshine in July: 9h and 54min
The month with the most sunshine is June (Average sunshine: 10h and 48min).
The months with the least sunshine are November and December (Average sunshine: 6h and 30min).
Average sunshine days in July
Honolulu, HI
- Average sunshine days in July: 8.8 days
The month with the most sunshine days is January (12.8 days).
The month with the least sunshine days is October (6.3 days).
Average UV index in July
Honolulu, HI
- Average UV index in July: 7
The months with the highest UV index are July, August and September (UV index 7).
The months with the lowest UV index are January, February, March, April, May, June, October, November and December (UV index 6).
Average cloud cover in July
Honolulu, HI
- Average cloud cover in July: 35
The month with the most cloud cover is March (Cloud cover 40).
The months with the least cloud cover are January and September (Cloud cover 33).
Average visibility in July
Honolulu, HI
- Average visibility in July: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
