Rayong

Ban Chang, Thailand Climate

NASA POWER reanalysis for the half-degree grid cell around Ban Chang, 1991-2020; a grid cell is an area average and can differ from a thermometer in town by several degrees

The warmest month is April, with an average high of 30°C; the coldest is December, with an average low of 25°C. A normal year brings 2014 mm of precipitation.

Temperature through the year

The normal daily high and low. The line marks today.

Normal daily high and low temperature at Ban Chang through the year, in °C, with the record for each date.1520253035JanFebMarAprMayJunJulAugSepOctNovDec
  • Normal low
  • Normal high
  • Reanalysis extreme high
  • Reanalysis extreme low

Normals for Sep 25

Normal high
28°C
Normal low
27°C
Reanalysis high
30°Cin 2019
Reanalysis low
26°Cin 1995
Chance of a wet day
97%
Daylight
12 h 05 min

Month by month

Averages for 1991-2020. Wet days have at least 1 mm of precipitation in the reanalysis. Each month links to its own page.

MonthAvg highAvg lowWarmestColdestPrecipitationWet days
January29°C25°C32°C (1991)18°C (2016)28 mm6.2
February29°C26°C32°C (2001)19°C (2016)25 mm5.7
March29°C27°C32°C (2010)21°C (2011)62 mm15.5
April30°C28°C33°C (2013)24°C (2018)90 mm18.0
May30°C29°C33°C (2020)26°C (1999)214 mm27.9
June29°C28°C31°C (2019)25°C (2002)282 mm30.0
July29°C28°C31°C (2015)26°C (2015)316 mm31.0
August29°C27°C31°C (2009)26°C (2012)304 mm31.0
September28°C27°C31°C (2004)25°C (1995)351 mm30.0
October29°C27°C32°C (2019)22°C (1994)245 mm27.9
November29°C26°C31°C (2004)20°C (1992)72 mm15.0
December28°C25°C32°C (2015)16°C (1999)25 mm6.2
Year29°C27°C2014 mm244

Precipitation

Rain and melted snow together. The chance of a wet day is the share of days with at least 1 mm of precipitation in the reanalysis.

2014 mm in a normal year, most in September.

Chance of a wet day

The chance of at least 1 mm of precipitation in the reanalysis on each date at Ban Chang, in percent.020406080100JanFebMarAprMayJunJulAugSepOctNovDec
  • Chance of a wet day

Humidity and comfort

NASA POWER reanalysis, 1991-2020, for the grid cell around Ban Chang.

The muggiest month is April, when 101 percent of days are muggy or worse, with a mean dew point of 18°C or more.

MonthDew pointHumidityDryComfortableHumidMuggyOppressiveMiserable
January21°C71%0%2%10%32%52%4%
February22°C74%0%1%4%17%63%15%
March24°C77%0%0%0%4%46%49%
April25°C77%0%0%0%1%15%85%
May25°C80%0%0%0%0%1%99%
June25°C82%0%0%0%0%2%98%
July25°C82%0%0%0%0%4%96%
August25°C83%0%0%0%0%6%94%
September25°C83%0%0%0%0%7%93%
October24°C81%0%0%0%2%23%75%
November23°C77%0%0%1%10%57%33%
December21°C73%0%1%8%32%52%7%

Comfort is judged by the day's mean dew point: dry below 13°C, comfortable to 16°C, humid to 18°C, muggy to 21°C, oppressive to 24°C, miserable above.

Clouds

Average share of the sky covered, from satellite (CERES and GEWEX SRB) by way of NASA POWER, 1991-2020.

The clearest month is February, with the sky 41 percent covered on average; the cloudiest is August, at 90 percent.

Wind

The mean wind speed over the whole day, from the MERRA-2 reanalysis by way of NASA POWER. Gusts run well above it.

The windiest month is July, averaging 20.9 km/h at 10 meters (33 feet) above the ground.

Daylight and sunshine

The longest day is Jun 15, with 12 h 53 min of daylight; the shortest is Dec 17, with 11 h 22 min.

Hours of daylight at Ban Chang through the year.0510152025JanFebMarAprMayJunJulAugSepOctNovDec
  • Day length

Solar energy

Average daily sunshine reaching the ground on a flat surface, in kilowatt-hours per square meter, clouds included.

Sunrise and sunset calendar

Month pages

The weather in Ban Chang in each month, day by day.

What this means

A normal is the average of the thirty years 1991 to 2020, the period the World Meteorological Organization and NOAA use for comparison. It is an average, not a forecast: most days depart from it, and some by a long way.

Where no station record is within reach, the extremes shown are the highest and lowest the reanalysis produced for the date in 1991-2020, not measured records.

Cloud, humidity, wind and sunshine come from a reanalysis: a weather model run over the past with every observation fed in, averaged over a grid cell about 50 km across. It is consistent everywhere on Earth; it smooths local detail such as a lake shore or a valley.

More for this place

Nearby

Sources

Cloud, humidity, wind and sunshine, and temperature and precipitation: NASA POWER (MERRA-2, CERES and GEWEX SRB), 1991-2020. The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center's Prediction Of Worldwide Energy Resources (POWER) project funded through the NASA Earth Science Division: POWER Daily API v2, accessed 2026-09-24. Sun and moon: computed with the NOAA solar equations and Meeus.