September Weather in Kiribati KiribatiDaily high temperatures are around 86°F, rarely falling below 84°F or exceeding 88°F. Daily low temperatures are around 78°F, rarely falling below 76°F or exceeding 80°F. For reference, on June 7, the hottest day of the year, temperatures in Kiribati typically range from 78°F to 86°F, while on February 5, the coldest day of the year, they range from 77°F to 84°F. The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on September. The horizontal axis is the day, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day. CloudsThe month of September in Kiribati experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 36% throughout the month. The clearest day of the month is September 4, with clear, mostly clear, or partly cloudy conditions 66% of the time. For reference, on April 20, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 56%, while on August 25, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 66%. PrecipitationA wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Kiribati, the chance of a wet day over the course of September is essentially constant, remaining around 7% throughout. For reference, the year's highest daily chance of a wet day is 34% on April 18, and its lowest chance is 6% on September 6. RainfallTo show variation within the month and not just the monthly total, we show the rainfall accumulated over a sliding 31-day period centered around each day. The average sliding 31-day rainfall during September in Kiribati is essentially constant, remaining about 0.9 inches throughout, and rarely exceeding 2.6 inches or falling below -0.0 inches. The lowest average 31-day accumulation is 0.8 inches on September 9. SunOver the course of September in Kiribati, the length of the day is essentially constant. The shortest day of the month is September 30, with 12 hours, 6 minutes of daylight and the longest day is September 1, with 12 hours, 8 minutes of daylight. The latest sunrise of the month in Kiribati is 8:23 AM on September 1 and the earliest sunrise is 9 minutes earlier at 8:15 AM on September 30. The latest sunset is 8:32 PM on September 1 and the earliest sunset is 11 minutes earlier at 8:21 PM on September 30. Daylight saving time is not observed in Kiribati during 2024. For reference, on June 20, the longest day of the year, the Sun rises at 8:23 AM and sets 12 hours, 12 minutes later, at 8:35 PM, while on December 21, the shortest day of the year, it rises at 8:24 AM and sets 12 hours, 3 minutes later, at 8:27 PM. The figure below presents a compact representation of the sun's elevation (the angle of the sun above the horizon) and azimuth (its compass bearing) for every hour of every day in the reporting period. The horizontal axis is the day of the year and the vertical axis is the hour of the day. For a given day and hour of that day, the background color indicates the azimuth of the sun at that moment. The black isolines are contours of constant solar elevation. MoonThe figure below presents a compact representation of key lunar data for September 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. The label associated with each bar indicates the date and time that the phase is obtained, and the companion time labels indicate the rise and set times of the Moon for the nearest time interval in which the moon is above the horizon.
HumidityWe 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. The chance that a given day will be muggy in Kiribati is essentially constant during September, remaining around 100% throughout. WindThis 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 Kiribati is essentially constant during September, remaining within 0.2 miles per hour of 13.2 miles per hour throughout. For reference, on January 12, the windiest day of the year, the daily average wind speed is 15.3 miles per hour, while on May 22, the calmest day of the year, the daily average wind speed is 11.9 miles per hour. The hourly average wind direction in Kiribati throughout September is predominantly from the east, with a peak proportion of 88% on September 1. Water TemperatureKiribati 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 surface water temperature in Kiribati is essentially constant during September, remaining around 82°F throughout. Growing SeasonDefinitions 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 Kiribati 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. The average accumulated growing degree days in Kiribati are rapidly increasing during September, increasing by 900°F, from 7,502°F to 8,402°F, over the course of the month. Solar EnergyThis 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 in Kiribati is essentially constant during September, remaining around 7.1 kWh throughout. The highest average daily incident shortwave solar energy during September is 7.1 kWh on September 21. TopographyFor the purposes of this report, the geographical coordinates of Kiribati are 1.421 deg latitude, 172.984 deg longitude, and 20 ft elevation. The topography within 2 miles of Kiribati 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 (62 feet). Within 50 miles is also essentially flat (92 feet). The area within 2 miles of Kiribati is covered by water (100%), within 10 miles by water (100%), and within 50 miles by water (100%). Data SourcesThis report illustrates the typical weather in Kiribati, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016. The details of the data sources used for this report can be found on the Cassidy International Airport page. DisclaimerThe information on this site is provided as is, without any assurances as to its accuracy or suitability for any purpose. Weather data is prone to errors, outages, and other defects. We assume no responsibility for any decisions made on the basis of the content presented on this site. We draw particular cautious attention to our reliance on the MERRA-2 model-based reconstructions for a number of important data series. While having the tremendous advantages of temporal and spatial completeness, these reconstructions: (1) are based on computer models that may have model-based errors, (2) are coarsely sampled on a 50 km grid and are therefore unable to reconstruct the local variations of many microclimates, and (3) have particular difficulty with the weather in some coastal areas, especially small islands. We further caution that our travel scores are only as good as the data that underpin them, that weather conditions at any given location and time are unpredictable and variable, and that the definition of the scores reflects a particular set of preferences that may not agree with those of any particular reader. 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