Weather in Kona by month: temperature, rainfall and cloud cover

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Kailua Kona is located on the west coast of the Big Island of Hawaii. The weather here is in general pleasant, sunny, and dry. Expect to see lots of sunshine in Kona all year round but especially during the summer months (April to October).

Kona lies on the leeward side of the Big Island. This is very important for the weather on any oceanic island because the leeward side is the side protected by the elevation of the island from the prevailing winds. The leeward side is thus the drier side of an island. Incidentally, Hilo can be found on the windward side of the island which is why it gets way more rain.

You can see this in more detail below, where we present you the yearly averages for Kona for the temperature, the precipitation and the amounts of cloudy days.

If you are interested in the general weather trends for Hawaii you should read our comprehensive Big Island weather guide:

Monthly average Kona weather: temperature, rainfall and cloud cover

The average temperatures in Kona are between 70°F and 80°F (21 and 27°c). August is the warmest month, and January the coolest. However, and especially for those visitors from the US mainland, temperatures here are always pleasant.

The monthly average temperature (left) rainfall (middle) and cloud frequency (right) for downtown Kona, Hawaii. See the “Sources” section below for image credits

 

As mentioned above Kona lies on the leeward (dry) side of the Big Island and has very little precipitation. The wettest month is September but this is no reason to avoid Kona this month. In general (but by no means as a rule) it rains in the late afternoon or at night.

April, May, and June are the most cloudy months, with clouds blocking the sun on average 70% or more of the time. December and January are the sunniest months, with a cloud cover of less than 50%.

Daily average Kona weather: air temperature and cloud cover on a hour-by-hour basis

There are large differences in cloud cover throughout the day. You will have the most chance to see the sun in the morning between 8 and 10 am, while after midday the chance of clouds increases rapidly. After 2 pm there is an ~80% chance of cloud cover.

The hourly average amount of cloud cover (left image), and temperature (right image) for downtown Kona on the Big Island of Hawaii. See the “Sources” section below for image credits.

Throughout the day there is only a limited (10 °F) variation in the air temperature. Direct exposure to the sun will make it feel warmer, and windchill and rain cooler.

Kona weather forecast

All the information on this website deals with average temperatures, and it is very likely that the day-to-day weather deviates from these numbers.

If you are interested in the current weather conditions and weather forecast for Kona, please look up the NAOO forecast.

Yearly weather summary for downtown Kona

we summarize all the information above in the following table. In the table you find the monthly averages for the air temperature, the amount of rainfall and the percentage of cloud cover.

month Temperature (°F) Rainfall (in) Cloud Frequency (%)
January 71.21 2.428 43.51
February 71.22 1.585 49.70
March 71.86 2.202 62.45
April 73.13 2.266 69.40
May 74.56 2.551 67.85
June 75.91 2.440 70.49
July 76.97 2.872 63.54
August 77.71 2.210 58.86
September 77.31 2.868 53.86
October 77.07 2.092 53.00
November 74.87 1.678 50.86
December 72.53 1.776 44.12
Annual 74.53 26.967 57.30
Monthly average air temperature, rainfall and cloud frequency for Kailua Kona on the Big Island. See the “Sources” section below for data credits

Sources

All tables and figures on this page have been created using data from the following source:

Giambelluca, T.W., X. Shuai, M.L. Barnes, R.J. Alliss, R.J. Longman, T. Miura, Q. Chen, A.G. Frazier, R.G. Mudd, L. Cuo, and A.D. Businger. 2014. Evapotranspiration of Hawai‘i. Final report submitted to the U.S. Army Corps of Engineers—Honolulu District, and the Commission on Water Resource Management, State of Hawai‘i.

The data have been downloaded from the Climate of Hawai’i website which provides a set of maps of the spatial patterns of climate for the major Hawaiian Islands.