Summer Weather at Seletar Airport Singapore

Daily high temperatures are around 88°F, rarely falling below 85°F or exceeding 92°F. The lowest daily average high temperature is 88°F on August 29.

Daily low temperatures are around 79°F, rarely falling below 76°F or exceeding 81°F. The highest daily average low temperature is 79°F on June 14.

For reference, on April 14, the hottest day of the year, temperatures at Seletar Airport typically range from 78°F to 90°F, while on January 5, the coldest day of the year, they range from 77°F to 86°F.

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

Barranquilla, Colombia (11,589 miles away) is the far-away foreign place with temperatures most similar to Seletar Airport (view comparison).

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The summer at Seletar Airport experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 85% throughout the season. The lowest chance of overcast or mostly cloudy conditions is 84% on June 27.

The clearest day of the summer is June 27, with clear, mostly clear, or partly cloudy conditions 16% of the time.

For reference, on December 3, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 91%, while on March 3, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 24%.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. At Seletar Airport, the chance of a wet day over the course of the summer is essentially constant, remaining around 37% throughout.

For reference, the year's highest daily chance of a wet day is 60% on November 13, and its lowest chance is 24% on February 10.

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 summer at Seletar Airport is gradually increasing, starting the season at 5.1 inches, when it rarely exceeds 8.5 inches or falls below 2.5 inches, and ending the season at 5.4 inches, when it rarely exceeds 8.7 inches or falls below 2.4 inches.

The lowest average 31-day accumulation is 4.8 inches on June 19.

Over the course of the summer at Seletar Airport, the length of the day is essentially constant. The shortest day of the summer is August 31, with 12 hours, 8 minutes of daylight and the longest day is June 19, with 12 hours, 12 minutes of daylight.

The earliest sunrise of the summer at Seletar Airport is 6:56 AM on June 1 and the latest sunrise is 9 minutes later at 7:05 AM on July 29.

The earliest sunset is 7:08 PM on June 1 and the latest sunset is 8 minutes later at 7:16 PM on July 23.

Daylight saving time is not observed at Seletar Airport during 2024.

For reference, on June 20, the longest day of the year, the Sun rises at 7:00 AM and sets 12 hours, 12 minutes later, at 7:12 PM, while on December 21, the shortest day of the year, it rises at 7:01 AM and sets 12 hours, 3 minutes later, at 7:04 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 summer 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 Seletar Airport is essentially constant during the summer, remaining around 100% throughout.

For reference, on January 1, the muggiest day of the year, there are muggy conditions 100% of the time, while on January 26, the least muggy day of the year, there are muggy conditions 100% 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 Seletar Airport is increasing during the summer, increasing from 6.2 miles per hour to 7.2 miles per hour over the course of the season.

For reference, on January 22, the windiest day of the year, the daily average wind speed is 10.0 miles per hour, while on April 24, the calmest day of the year, the daily average wind speed is 5.0 miles per hour.

The highest daily average wind speed during the summer is 7.8 miles per hour on August 7.

The hourly average wind direction at Seletar Airport throughout the summer is predominantly from the south, with a peak proportion of 88% on August 5.

Seletar 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 Seletar Airport is essentially constant during the summer, remaining within 1°F of 85°F throughout.

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 Seletar 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 Seletar Airport are very rapidly increasing during the summer, increasing by 2,974°F, from 4,795°F to 7,769°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 Seletar Airport is essentially constant during the summer, remaining within 0.2 kWh of 3.9 kWh throughout.

The lowest average daily incident shortwave solar energy during the summer is 3.7 kWh on June 20.