The highest day temperature in August 2025 was 95°F. The lowest night temperature was 77°F. The average values for day and night temperatures during August were 93.0°F и 79.9°F respectivly.

The average sea surface temperature in August 2025 for Surabaya was 87.8°F. The maximum and minimum values were 87.0°F and 88.6°F respectively.

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

Precipitation total in August for Surabaya is 0.3 in. It makes august the least rainy month of the year.

The average wind speed in August is 6.5 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 Surabaya in August is 10.0 hours.