The highest day temperature in July 2025 was 84°F. The lowest night temperature was 65°F. The average values for day and night temperatures during July were 74.8°F и 72.6°F respectivly.

The average sea surface temperature in July 2025 for Hilo was 82.6°F. The maximum and minimum values were 82.0°F and 83.4°F respectively.

Most of the days in July are sunny but you can also expect cloudy and gloomy days.

Precipitation total in July for Hilo is 1.8 in. It makes july one of the least rainy months of the year.

The average wind speed in July is 7.9 mph. This value is relatively stable throughout the year.

We are using day length and cloud cover information for each day of the month to calculate averages for this chart. Average sunny hours for Hilo in July is 7.9 hours.