Climate and Average Weather Year Round in Hiva Oa French Polynesia

The climate in Hiva Oa is warm, oppressive, windy, and partly cloudy. Over the course of the year, the temperature typically varies from 75°F to 86°F and is rarely below 72°F or above 87°F.

Based on the beach/pool score, the best time of year to visit Hiva Oa for hot-weather activities is from mid May to early October.

The temperature in Hiva Oa varies so little throughout the year that it is not entirely meaningful to discuss hot and cold seasons.

In Hiva Oa, the average percentage of the sky covered by clouds experiences significant seasonal variation over the course of the year.

The clearer part of the year in Hiva Oa begins around May 11 and lasts for 5.2 months, ending around October 17.

The clearest month of the year in Hiva Oa is August, during which on average the sky is clear, mostly clear, or partly cloudy 74% of the time.

The cloudier part of the year begins around October 17 and lasts for 6.8 months, ending around May 11.

The cloudiest month of the year in Hiva Oa is December, during which on average the sky is overcast or mostly cloudy 71% of the time.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Hiva Oa varies significantly throughout the year.

The wetter season lasts 6.5 months, from October 20 to May 3, with a greater than 24% chance of a given day being a wet day. The month with the most wet days in Hiva Oa is December, with an average of 11.6 days with at least 0.04 inches of precipitation.

The drier season lasts 5.5 months, from May 3 to October 20. The month with the fewest wet days in Hiva Oa is August, with an average of 2.8 days with at least 0.04 inches of precipitation.

Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. The month with the most days of rain alone in Hiva Oa is December, with an average of 11.6 days. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 40% on December 12.

Rainfall

To show variation within the months and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day of the year. Hiva Oa experiences extreme seasonal variation in monthly rainfall.

Rain falls throughout the year in Hiva Oa. The month with the most rain in Hiva Oa is December, with an average rainfall of 5.6 inches.

The month with the least rain in Hiva Oa is August, with an average rainfall of 0.7 inches.

The length of the day in Hiva Oa does not vary substantially over the course of the year, staying within 41 minutes of 12 hours throughout. In 2024, the shortest day is June 20, with 11 hours, 33 minutes of daylight; the longest day is December 20, with 12 hours, 42 minutes of daylight.

The earliest sunrise is at 4:43 AM on November 16, and the latest sunrise is 50 minutes later at 5:33 AM on July 12. The earliest sunset is at 5:01 PM on May 27, and the latest sunset is 44 minutes later at 5:45 PM on January 27.

Daylight saving time (DST) is not observed in Hiva Oa during 2024.

The figure below presents a compact representation of key lunar data for 2024. The horizontal axis is the day, the vertical axis is the hour of the day, and the colored areas indicate when the moon is above the horizon. The vertical gray bars (new Moons) and blue bars (full Moons) indicate key Moon phases.

We base the humidity comfort level on the dew point, as it determines whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid. Unlike temperature, which typically varies significantly between night and day, dew point tends to change more slowly, so while the temperature may drop at night, a muggy day is typically followed by a muggy night.

Hiva Oa experiences some seasonal variation in the perceived humidity.

The muggier period of the year lasts for 10 months, from August 26 to July 10, during which time the comfort level is muggy, oppressive, or miserable at least 88% of the time. The month with the most muggy days in Hiva Oa is March, with 31.0 days that are muggy or worse.

The month with the fewest muggy days in Hiva Oa is August, with 26.7 days that are muggy or worse.

This section discusses the wide-area hourly average wind vector (speed and direction) at 10 meters above the ground. The wind experienced at any given location is highly dependent on local topography and other factors, and instantaneous wind speed and direction vary more widely than hourly averages.

The average hourly wind speed in Hiva Oa experiences mild seasonal variation over the course of the year.

The windier part of the year lasts for 4.1 months, from June 13 to October 16, with average wind speeds of more than 13.2 miles per hour. The windiest month of the year in Hiva Oa is July, with an average hourly wind speed of 14.1 miles per hour.

The calmer time of year lasts for 7.9 months, from October 16 to June 13. The calmest month of the year in Hiva Oa is April, with an average hourly wind speed of 12.3 miles per hour.

The predominant average hourly wind direction in Hiva Oa is from the east throughout the year.

Hiva Oa is located near a large body of water (e.g., ocean, sea, or large lake). This section reports on the wide-area average surface temperature of that water.

The average water temperature experiences some seasonal variation over the course of the year.

The time of year with warmer water lasts for 3.7 months, from January 10 to May 2, with an average temperature above 82°F. The month of the year in Hiva Oa with the warmest water is March, with an average temperature of 83°F.

The time of year with cooler water lasts for 3.3 months, from July 10 to October 21, with an average temperature below 79°F. The month of the year in Hiva Oa with the coolest water is August, with an average temperature of 78°F.

To characterize how pleasant the weather is in Hiva Oa throughout the year, we compute two travel scores.

The tourism score favors clear, rainless days with perceived temperatures between 65°F and 80°F. Based on this score, the best time of year to visit Hiva Oa for general outdoor tourist activities is from late June to late September, with a peak score in the third week of August.

The beach/pool score favors clear, rainless days with perceived temperatures between 75°F and 90°F. Based on this score, the best time of year to visit Hiva Oa for hot-weather activities is from mid May to early October, with a peak score in the third week of August.

Methodology

For each hour between 8:00 AM and 9:00 PM of each day in the analysis period (1980 to 2016), independent scores are computed for perceived temperature, cloud cover, and total precipitation. Those scores are combined into a single hourly composite score, which is then aggregated into days, averaged over all the years in the analysis period, and smoothed.

Our cloud cover score is 10 for fully clear skies, falling linearly to 9 for mostly clear skies, and to 1 for fully overcast skies.

Our precipitation score, which is based on the three-hour precipitation centered on the hour in question, is 10 for no precipitation, falling linearly to 9 for trace precipitation, and to 0 for 0.04 inches of precipitation or more.

Our tourism temperature score is 0 for perceived temperatures below 50°F, rising linearly to 9 for 65°F, to 10 for 75°F, falling linearly to 9 for 80°F, and to 1 for 90°F or hotter.

Our beach/pool temperature score is 0 for perceived temperatures below 65°F, rising linearly to 9 for 75°F, to 10 for 82°F, falling linearly to 9 for 90°F, and to 1 for 100°F or hotter.

Definitions of the growing season vary throughout the world, but for the purposes of this report, we define it as the longest continuous period of non-freezing temperatures (≥ 32°F) in the year (the calendar year in the Northern Hemisphere, or from July 1 until June 30 in the Southern Hemisphere).

Temperatures in Hiva Oa are sufficiently warm year round that it is not entirely meaningful to discuss the growing season in these terms. We nevertheless include the chart below as an illustration of the distribution of temperatures experienced throughout the year.

Growing degree days are a measure of yearly heat accumulation used to predict plant and animal development, and defined as the integral of warmth above a base temperature, discarding any excess above a maximum temperature. In this report, we use a base of 50°F and a cap of 86°F.

This section discusses the total daily incident shortwave solar energy reaching the surface of the ground over a wide area, taking full account of seasonal variations in the length of the day, the elevation of the Sun above the horizon, and absorption by clouds and other atmospheric constituents. Shortwave radiation includes visible light and ultraviolet radiation.

The average daily incident shortwave solar energy experiences some seasonal variation over the course of the year.

The brighter period of the year lasts for 4.2 months, from September 16 to January 22, with an average daily incident shortwave energy per square meter above 6.1 kWh. The brightest month of the year in Hiva Oa is October, with an average of 6.5 kWh.

The darker period of the year lasts for 2.4 months, from May 8 to July 21, with an average daily incident shortwave energy per square meter below 4.6 kWh. The darkest month of the year in Hiva Oa is June, with an average of 4.2 kWh.

For the purposes of this report, the geographical coordinates of Hiva Oa are -9.765 deg latitude, -138.999 deg longitude, and 0 ft elevation.

The topography within 2 miles of Hiva Oa is essentially flat, with a maximum elevation change of 0 feet and an average elevation above sea level of 0 feet. Within 10 miles is also essentially flat (0 feet). Within 50 miles is also essentially flat (0 feet).

The area within 2 miles of Hiva Oa is covered by water (97%), within 10 miles by water (100%), and within 50 miles by water (100%).