September Weather at Mae Sariang ThailandDaily high temperatures increase by 2°F, from 86°F to 88°F, rarely falling below 82°F or exceeding 92°F. Daily low temperatures are around 74°F, rarely falling below 72°F or exceeding 76°F. For reference, on April 14, the hottest day of the year, temperatures at Mae Sariang typically range from 73°F to 98°F, while on January 30, the coldest day of the year, they range from 56°F to 88°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. Macedonio Alonso, Mexico (9,588 miles away); Totolapa, Mexico (9,943 miles); and Ipinda, Tanzania (4,770 miles) are the far-away foreign places with temperatures most similar to Mae Sariang (view comparison). CloudsThe month of September at Mae Sariang experiences gradually decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 93% to 85%. The clearest day of the month is September 30, with clear, mostly clear, or partly cloudy conditions 15% of the time. For reference, on August 1, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 95%, while on February 20, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 73%. PrecipitationA wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. At Mae Sariang, the chance of a wet day over the course of September is very rapidly decreasing, starting the month at 59% and ending it at 49%. For reference, the year's highest daily chance of a wet day is 67% on August 6, and its lowest chance is 1% on January 26. 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 at Mae Sariang is rapidly decreasing, starting the month at 6.9 inches, when it rarely exceeds 10.5 inches or falls below 3.6 inches, and ending the month at 5.1 inches, when it rarely exceeds 7.6 inches or falls below 2.8 inches. SunOver the course of September at Mae Sariang, the length of the day is gradually decreasing. From the start to the end of the month, the length of the day decreases by 29 minutes, implying an average daily decrease of 1 minute, 1 second, and weekly decrease of 7 minutes, 5 seconds. The shortest day of the month is September 30, with 11 hours, 59 minutes of daylight and the longest day is September 1, with 12 hours, 28 minutes of daylight. The earliest sunrise of the month at Mae Sariang is 6:13 AM on September 1 and the latest sunrise is 5 minutes later at 6:18 AM on September 30. The latest sunset is 6:42 PM on September 1 and the earliest sunset is 25 minutes earlier at 6:17 PM on September 30. Daylight saving time is not observed at Mae Sariang during 2024. For reference, on June 20, the longest day of the year, the Sun rises at 5:53 AM and sets 13 hours, 13 minutes later, at 7:06 PM, while on December 21, the shortest day of the year, it rises at 6:55 AM and sets 11 hours, 3 minutes later, at 5:57 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 at Mae Sariang is essentially constant during September, remaining around 100% throughout. For reference, on June 2, the muggiest day of the year, there are muggy conditions 100% of the time, while on January 25, the least muggy day of the year, there are muggy conditions 10% of the time. 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 at Mae Sariang is essentially constant during September, remaining within 0.2 miles per hour of 2.1 miles per hour throughout. For reference, on June 24, the windiest day of the year, the daily average wind speed is 3.1 miles per hour, while on September 29, the calmest day of the year, the daily average wind speed is 1.8 miles per hour. The lowest daily average wind speed during September is 1.8 miles per hour on September 30. The wind direction at Mae Sariang during September is predominantly out of the west from September 1 to September 2 and the south from September 2 to September 30. 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 at Mae Sariang 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 Mae Sariang are rapidly increasing during September, increasing by 839°F, from 6,527°F to 7,366°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 at Mae Sariang is essentially constant during September, remaining within 0.2 kWh of 4.7 kWh throughout. TopographyFor the purposes of this report, the geographical coordinates of Mae Sariang are 18.167 deg latitude, 97.933 deg longitude, and 725 ft elevation. The topography within 2 miles of Mae Sariang contains very significant variations in elevation, with a maximum elevation change of 1,650 feet and an average elevation above sea level of 899 feet. Within 10 miles contains very significant variations in elevation (4,173 feet). Within 50 miles also contains extreme variations in elevation (8,415 feet). The area within 2 miles of Mae Sariang is covered by trees (66%) and cropland (34%), within 10 miles by trees (89%) and cropland (11%), and within 50 miles by trees (82%) and shrubs (11%). Data SourcesThis report illustrates the typical weather at Mae Sariang, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016. Temperature and Dew PointMae Sariang has a weather station that reported reliably enough during the analysis period that we have included it in our network. When available, historical temperature and dew point measurements are taken directly from this weather station. These records are obtained from NOAA's Integrated Surface Hourly data set, falling back on ICAO METAR records as required. In the case of missing or erroneous measurements from this station, we fall back on records from nearby stations, adjusted according to typical seasonal and diurnal intra-station differences. For a given day of the year and hour of the day, the fallback station is selected to minimize the prediction error over the years for which there are measurements for both stations. The stations on which we may fall back are Sanam Bin Mae Hong Son and Chiang Mai International Airport. Other DataAll data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Algorithms 2nd Edition , by Jean Meeus. All other weather data, including cloud cover, precipitation, wind speed and direction, and solar flux, come from NASA's MERRA-2 Modern-Era Retrospective Analysis . This reanalysis combines a variety of wide-area measurements in a state-of-the-art global meteorological model to reconstruct the hourly history of weather throughout the world on a 50-kilometer grid. Land Use data comes from the Global Land Cover SHARE database , published by the Food and Agriculture Organization of the United Nations. Elevation data comes from the Shuttle Radar Topography Mission (SRTM) , published by NASA's Jet Propulsion Laboratory. Names, locations, and time zones of places and some airports come from the GeoNames Geographical Database . Time zones for airports and weather stations are provided by AskGeo.com . Maps are © OpenStreetMap contributors. 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. 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