Climate in Isarn

Average daytime and nighttime temperatures

All climatic diagrams on this site result from the collected data from ten measuring weather stations in Isarn.
All data correspond to the average monthly values of the last 20 years.

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Isarn is one of the coldest regions in Thailand with an average daily high temperature of only 33 degrees centigrade. The climate is very warm with an annual average of 33 degrees, but has few truly tropical and sultry months. It is yearlong warm or hot. Dued to the lesser rain the best time for traveling is from November to April. The most rain days occur from from May to September.
Overview: Climate in Thailand
Daylengths and sun positions in Thailand
Compare climate with other regions or countries
Hours of sunshine per daySunshine hours per day in Isarn
The number of hours of sunshine refers to the time when the sun is actually visible. That is, without any obstruction of visibility by clouds, fog or mountains. With 9 hours per day, February is the sunniest month in the region of Isarn. In August the sun shines the shortest.
Rainy days per monthRainy days per month in Isarn
A rainy day is a day on which at least an amount of 0.1 mm precipitation (=0.1 liter) per square meter falls. This can be rain, snow, hail or even dew. So it does not have to rain the whole day. With 18 rainy days, August offers the most number of rainy days, and in December the least.
Precipitation in mm/dayPrecipitation in Isarn
The amount of precipitation is measured in millimeters per square meter. Thus, at two mm/day, two liters of water fall on one square meter within 24 hours. With only 0.2 mm, the least rain falls in December. August, on the other hand, has the most rain.
Relative humidity in %Relative humidity in Isarn
Warm air can absorb more moisture than cold air. The relative humidity indicates how much moisture of the physically possible is actually contained in the air. At high humidity, the person feels uncomfortable and perceives this as oppressive. In general, a relative humidity of 40-60% gives as pleasant. With humidity averaging 83%, September is the most uncomfortable. In March, on the other hand, it is easier to endure.
Absolute humidity in g/m³Absolute humidity in Isarn
In warm months, there is also a higher absolute humidity almost everywhere. At a temperature of 25°C, air can absorb up to 23 grams of water per cubic meter. At 20°C, it is only 17.3 grams. A relative humidity of 40% at 25°C thus corresponds to an absolute humidity of 9.2 grams of water. From a proportion of approx. 13.5 grams, humans perceive the air as muggy. This limit is exceeded throughout the year in Isarn.
Humidex in °CHumidex in Isarn
The "Humidex" (humidity index) is an index of well-being in warmer areas, calculated from the air temperature, relative humidity and dew point. The index corresponds approximately to the temperature felt. At high temperatures, the body transports heat away by sweating. At high humidity the ambient air can only absorb a small amount of sweat and thus one feels uncomfortable. An index of 20-29 is considered comfortable. Up to 39, people perceive the air as slightly uncomfortable, and above 40, as very uncomfortable. Values above 45 are dangerous in the long run and often lead to heat stroke.
Climate charts for other regions in Thailand

Map of Isarn

Most important cities in the region »Isarn«

Alone 13 cities with over 100,000 inhabitants are located here. The region has a west-east extension of about 600 km and over 440 km from north to south.

It consists of the 21 provinces Amnat Charoen, Bueng Kan, Buriram, Chaiyaphum, Kalasin, Khon Kaen, Loei, Maha Sarakham, Mukdahan, Nakhon Phanom, Nakhon Ratchasima, Nong Bua Lamphu, Nong Khai, Roi Et, Sakon Nakhon, Sisaket, Surin, Ubon Ratchathani, Udon Thani, Uthai Thani and Yasothon.

CityPopulationGeo position
Buriram206,31414° 59' 40"N103° 6' 14"E
Kalasin188,19716° 25' 58"N103° 30' 24"E
Nong Khai183,41617° 52' 42"N102° 44' 31"E
Chaiyaphum177,16715° 48' 38"N102° 1' 44"E
Udon Thani153,32917° 24' 56"N102° 47' 9"E
Roi Et152,95916° 3' 24"N103° 39' 11"E
Si Sa Ket148,41215° 6' 53"N104° 19' 46"E
Nakhon Ratchasima131,28614° 58' 14"N102° 6' 7"E
Khon Kaen120,04516° 26' 48"N102° 49' 59"E
Maha Sarakham115,89616° 11' 5"N103° 18' 2"E
Nong Bua Lamphu110,41517° 12' 15"N102° 26' 26"E
Surin104,65114° 52' 55"N103° 29' 37"E
Loei102,96517° 29' 26"N101° 43' 39"E
Nakhon Phanom94,24417° 24' 39"N104° 46' 43"E
Ubon Ratchathani77,30615° 14' 18"N104° 50' 55"E
Sakon Nakhon76,23717° 9' 40"N104° 8' 50"E
Amnat Charoen64,40415° 51' 31"N104° 37' 44"E
Yasothon62,43315° 47' 39"N104° 8' 42"E
Uthai Thani54,33915° 22' 46"N100° 1' 28"E
Pak Chong48,99914° 42' 29"N101° 24' 58"E
Mukdahan46,94116° 32' 43"N104° 43' 25"E
Chum Phae46,33516° 32' 39"N102° 5' 57"E
Warin Chamrap43,10215° 11' 35"N104° 51' 46"E
Kantharalak36,62114° 38' 26"N104° 38' 60"E
Det Udom35,66914° 54' 22"N105° 4' 42"E
Ban Phai35,58316° 3' 36"N102° 43' 51"E
Tha Bo35,29217° 51' 0"N102° 34' 53"E
Na Klang31,02417° 18' 26"N102° 11' 20"E
Ban Phan Don29,21117° 8' 34"N102° 58' 21"E
Kaeng Khro29,05616° 6' 31"N102° 15' 29"E

Data basis: German Weather Service, individual values averaged and supplemented by own elements. Data on cities and inhabitants:, United Nations Statistics Division and own research.
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