Fall Weather at Sam Ratulangi International Airport Indonesia

Daily high temperatures are around 88°F, rarely falling below 84°F or exceeding 92°F. The highest daily average high temperature is 89°F on September 16.

Daily low temperatures are around 73°F, rarely falling below 70°F or exceeding 75°F. The lowest daily average low temperature is 72°F on September 15.

For reference, on September 16, the hottest day of the year, temperatures at Sam Ratulangi International Airport typically range from 72°F to 89°F, while on September 12, the coldest day of the year, they range from 72°F to 89°F.

The figure below shows you a compact characterization of the hourly average fall temperatures. 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.

Iquitos, Peru (11,185 miles away) and Grand-Santi, French Guiana (12,045 miles) are the far-away foreign places with temperatures most similar to Sam Ratulangi International Airport (view comparison).

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The fall at Sam Ratulangi International Airport experiences rapidly increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 74% to 87%.

The clearest day of the fall is September 1, with clear, mostly clear, or partly cloudy conditions 26% of the time.

For reference, on December 1, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 87%, while on August 21, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 26%.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. At Sam Ratulangi International Airport, the chance of a wet day over the course of the fall is very rapidly increasing, starting the season at 21% and ending it at 51%.

For reference, the year's highest daily chance of a wet day is 58% on January 22, and its lowest chance is 21% on September 1.

Rainfall

To show variation within the season and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day.

The average sliding 31-day rainfall during the fall at Sam Ratulangi International Airport is very rapidly increasing, starting the season at 2.2 inches, when it rarely exceeds 5.3 inches, and ending the season at 6.4 inches, when it rarely exceeds 10.4 inches or falls below 2.8 inches.

Over the course of the fall at Sam Ratulangi International Airport, the length of the day is essentially constant. The shortest day of the fall is November 30, with 12 hours, 2 minutes of daylight and the longest day is September 1, with 12 hours, 8 minutes of daylight.

The latest sunrise of the fall at Sam Ratulangi International Airport is 5:36 AM on September 1 and the earliest sunrise is 14 minutes earlier at 5:22 AM on November 2.

The latest sunset is 5:44 PM on September 1 and the earliest sunset is 19 minutes earlier at 5:25 PM on November 5.

Daylight saving time is not observed at Sam Ratulangi International Airport during 2024.

For reference, on June 20, the longest day of the year, the Sun rises at 5:35 AM and sets 12 hours, 13 minutes later, at 5:48 PM, while on December 21, the shortest day of the year, it rises at 5:37 AM and sets 12 hours, 2 minutes later, at 5:39 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.

The figure below presents a compact representation of key lunar data for the fall of 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.

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.

The chance that a given day will be muggy at Sam Ratulangi International Airport is gradually increasing during the fall, rising from 96% to 100% over the course of the season.

For reference, on January 1, the muggiest day of the year, there are muggy conditions 100% of the time, while on August 10, the least muggy day of the year, there are muggy conditions 94% of the time.

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 at Sam Ratulangi International Airport is rapidly decreasing during the fall, decreasing from 9.0 miles per hour to 7.0 miles per hour over the course of the season.

For reference, on August 9, the windiest day of the year, the daily average wind speed is 10.4 miles per hour, while on April 30, the calmest day of the year, the daily average wind speed is 5.9 miles per hour.

The lowest daily average wind speed during the fall is 6.0 miles per hour on November 9.

The wind direction at Sam Ratulangi International Airport during the fall is predominantly out of the south from September 1 to October 28 and the west from October 28 to November 30.

Sam Ratulangi International Airport 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 at Sam Ratulangi International Airport is essentially constant during the fall, remaining within 1°F of 84°F throughout.

The highest average surface water temperature during the fall is 85°F on November 7.

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 at Sam Ratulangi International Airport 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 at Sam Ratulangi International Airport are very rapidly increasing during the fall, increasing by 2,632°F, from 7,067°F to 9,698°F, over the course of the season.

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 at Sam Ratulangi International Airport is decreasing during the fall, falling by 1.1 kWh, from 5.2 kWh to 4.1 kWh, over the course of the season.

The highest average daily incident shortwave solar energy during the fall is 5.2 kWh on September 15.

For the purposes of this report, the geographical coordinates of Sam Ratulangi International Airport are 1.549 deg latitude, 124.926 deg longitude, and 282 ft elevation.

The topography within 2 miles of Sam Ratulangi International Airport contains only modest variations in elevation, with a maximum elevation change of 344 feet and an average elevation above sea level of 280 feet. Within 10 miles contains only modest variations in elevation (6,473 feet). Within 50 miles also contains extreme variations in elevation (6,512 feet).

The area within 2 miles of Sam Ratulangi International Airport is covered by trees (53%) and cropland (36%), within 10 miles by trees (45%) and cropland (24%), and within 50 miles by water (80%) and trees (12%).