This information may change. Always check the official source.Last verified: August 2026 by Ondřej Kadlec
Best time to visit Cambodia
In Phnom Penh: December to February. Every month in Phnom Penh averages above 27 °C by day, so the choice here is rain rather than temperature — those are the driest three months in a row.
Cambodia is not one climate. Each reference city below is answered on its own numbers.
Phnom Penh
Jan32°January: 32 °C by day, 22 °C at night, 15 mm of rain, recommended
Feb33°February: 33 °C by day, 24 °C at night, 11 mm of rain, recommended
Mar35°March: 35 °C by day, 25 °C at night, 39 mm of rain
Apr35°April: 35 °C by day, 26 °C at night, 94 mm of rain
May33°May: 33 °C by day, 26 °C at night, 165 mm of rain
Jun33°June: 33 °C by day, 25 °C at night, 157 mm of rain
Jul32°July: 32 °C by day, 25 °C at night, 168 mm of rain
Aug32°August: 32 °C by day, 25 °C at night, 189 mm of rain
Sep31°September: 31 °C by day, 25 °C at night, 265 mm of rain
Oct30°October: 30 °C by day, 24 °C at night, 263 mm of rain
Nov30°November: 30 °C by day, 24 °C at night, 104 mm of rain
Dec30°December: 30 °C by day, 23 °C at night, 31 mm of rain, recommended
Warmest
March, 35 °C
Coolest
October, 30 °C
Driest
February, 11 mm
Wettest
September, 265 mm
Siem Reap
December to February. Every month in Siem Reap averages above 27 °C by day, so the choice here is rain rather than temperature — those are the driest three months in a row.
Jan31°January: 31 °C by day, 21 °C at night, 11 mm of rain, recommended
Feb33°February: 33 °C by day, 23 °C at night, 19 mm of rain, recommended
Mar34°March: 34 °C by day, 25 °C at night, 55 mm of rain
Apr34°April: 34 °C by day, 26 °C at night, 109 mm of rain
May33°May: 33 °C by day, 26 °C at night, 173 mm of rain
Jun32°June: 32 °C by day, 26 °C at night, 138 mm of rain
Jul32°July: 32 °C by day, 25 °C at night, 164 mm of rain
Aug31°August: 31 °C by day, 25 °C at night, 184 mm of rain
Sep30°September: 30 °C by day, 25 °C at night, 277 mm of rain
Oct30°October: 30 °C by day, 24 °C at night, 230 mm of rain
Nov30°November: 30 °C by day, 23 °C at night, 77 mm of rain
Dec30°December: 30 °C by day, 21 °C at night, 17 mm of rain, recommended
Warmest
March, 34 °C
Coolest
September, 30 °C
Driest
January, 11 mm
Wettest
September, 277 mm
Sihanoukville
December to February. Every month in Sihanoukville averages above 27 °C by day, so the choice here is rain rather than temperature — those are the driest three months in a row.
Jan29°January: 29 °C by day, 24 °C at night, 54 mm of rain, recommended
Feb30°February: 30 °C by day, 24 °C at night, 50 mm of rain, recommended
Mar31°March: 31 °C by day, 25 °C at night, 120 mm of rain
Apr31°April: 31 °C by day, 26 °C at night, 186 mm of rain
May30°May: 30 °C by day, 26 °C at night, 331 mm of rain
Jun29°June: 29 °C by day, 25 °C at night, 412 mm of rain
Jul28°July: 28 °C by day, 25 °C at night, 506 mm of rain
Aug28°August: 28 °C by day, 25 °C at night, 472 mm of rain
Sep28°September: 28 °C by day, 25 °C at night, 484 mm of rain
Oct29°October: 29 °C by day, 25 °C at night, 393 mm of rain
Nov29°November: 29 °C by day, 25 °C at night, 161 mm of rain
Dec30°December: 30 °C by day, 24 °C at night, 61 mm of rain, recommended
Warmest
March, 31 °C
Coolest
July, 28 °C
Driest
February, 50 mm
Wettest
July, 506 mm
How this is worked out: a month qualifies when its mean daytime high falls between 18 °C and 27 °C. Where more than five qualify, the answer is the driest run of consecutive qualifying months; where none do, it is the driest three months in a row if the year is hot throughout, or the warmest three if it never gets there. The figures are the thirty-year monthly averages charted below, and they are averages, not a forecast — any single year can miss them by a wide margin.
Phnom Penh
Long-term averages for Phnom Penh: the mean daily high, the mean overnight low and the mean monthly rainfall across 30 years of ERA5 reanalysis data (1995–2024).
DayNight
Show the monthly table
Phnom Penh
Month
Day (°C)
Night (°C)
Rain (mm)
January
32
22
15
February
33
24
11
March
35
25
39
April
35
26
94
May
33
26
165
June
33
25
157
July
32
25
168
August
32
25
189
September
31
25
265
October
30
24
263
November
30
24
104
December
30
23
31
Siem Reap
Long-term averages for Siem Reap: the mean daily high, the mean overnight low and the mean monthly rainfall across 30 years of ERA5 reanalysis data (1995–2024).
DayNight
Show the monthly table
Siem Reap
Month
Day (°C)
Night (°C)
Rain (mm)
January
31
21
11
February
33
23
19
March
34
25
55
April
34
26
109
May
33
26
173
June
32
26
138
July
32
25
164
August
31
25
184
September
30
25
277
October
30
24
230
November
30
23
77
December
30
21
17
Sihanoukville
Long-term averages for Sihanoukville: the mean daily high, the mean overnight low and the mean monthly rainfall across 30 years of ERA5 reanalysis data (1995–2024).
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