Laos Climatic Classifications

Code Description Group Number of states/regions States/regions
Cwa Humid subtropical, dry winter Temperate 7 Houaphan Louang Namtha Louangphabang Oudômxai Phôngsali Xaisômboun Xiangkhouang
Aw Tropical wet and dry or savanna Tropical 6 Bokèo Bolikhamxai Champasak Savannakhét Vientiane Xaignabouli
Am Tropical monsoon Tropical 4 Attapu Khammouan Salavan Xékong

Summary: Most regions (7) in Laos lie in the Humid subtropical, dry winter climate zone (Köppen: Cwa). The mean average of annual temperatures range from a high of 28.39°C (83.1°F) in Vientiane to a low of 21.61°C (70.9°F) in Houaphan.

Climate Laos: Weather By Month

Month Jan Feb Mar Apr May Jun Jul Aug Sep Nov Oct Dec Year
Record high °C (°F) 31.27(88.29) 33.78(92.8) 35.87(96.57) 37.48(99.46) 35.33(95.59) 32.43(90.37) 30.9(87.62) 30.63(87.13) 31.25(88.25) 30.83(87.49) 30.86(87.55) 30.17(86.31) 37.48(99.46)
Average high °C (°F) 26.63(79.93) 29.93(85.87) 32.75(90.95) 33.68(92.62) 32.32(90.18) 30.06(86.11) 28.59(83.46) 28.58(83.44) 29.52(85.14) 29.02(84.24) 28.27(82.89) 26.09(78.96) 29.62(85.32)
Daily mean °C (°F) 21.21(70.18) 24.12(75.42) 27.58(81.64) 29.2(84.56) 28.65(83.57) 27.02(80.64) 25.76(78.37) 25.59(78.06) 26.01(78.82) 24.96(76.93) 23.68(74.62) 20.95(69.71) 25.39(77.7)
Average low °C (°F) 13.13(55.63) 14.77(58.59) 18.6(65.48) 21.03(69.85) 21.85(71.33) 21.71(71.08) 21.12(70.02) 20.83(69.49) 20.25(68.45) 18.16(64.69) 16.34(61.41) 13.21(55.78) 18.42(65.16)
Record low °C (°F) 7.94(46.29) 9.13(48.43) 13.29(55.92) 17.02(62.64) 18.2(64.76) 18.58(65.44) 18.36(65.05) 18.02(64.44) 17.09(62.76) 14.68(58.42) 11.76(53.17) 8.39(47.1) 7.94(46.29)
Average precipitation mm (inches) 15.86(0.62) 6.62(0.26) 26.1(1.03) 64.59(2.54) 146.53(5.77) 184.43(7.26) 245.13(9.65) 295.09(11.62) 191.45(7.54) 95.56(3.76) 26.47(1.04) 12.14(0.48) 109.16(4.3)
Average precipitation days (≥ 1.0 mm) 3.04 1.87 6.01 13.27 21.15 23.67 26.48 26.21 22.13 13.02 6.35 2.48 13.81
Average relative humidity (%) 72.32 60.74 53.44 59.44 71.78 81.58 86.9 87.7 84.33 80.03 77.41 74.84 74.21
Mean monthly sunshine hours 8.49 10.66 11.37 12.33 12.31 11.77 10.93 10.89 10.68 9.25 8.8 8.26 10.48

Laos Climate Graph

Laos’s Cities by Temperature

Laos’s states/regions ranking by average yearly temperature:

Vientiane
28.39°C | 83.1°F
Savannakhét
28.01°C | 82.42°F
Champasak
27.89°C | 82.2°F
Bolikhamxai
27.73°C | 81.91°F
Khammouan
27.73°C | 81.91°F
Attapu
26.6°C | 79.88°F
Xékong
26.44°C | 79.59°F
Salavan
26.41°C | 79.54°F
Bokèo
25.65°C | 78.17°F
Xaignabouli
25.01°C | 77.02°F
Louangphabang
24.93°C | 76.87°F
Xaisômboun
24.93°C | 76.87°F
Oudômxai
23.14°C | 73.65°F
Phôngsali
22.7°C | 72.86°F
Louang Namtha
22.55°C | 72.59°F
Xiangkhouang
21.98°C | 71.56°F
Houaphan
21.61°C | 70.9°F

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