Cambodia has no ideal window. No month clears the bar for comfortable travel outright, but Nov–Dec comes closest — rated fair rather than too hot, too cold or too wet.
Monsoon May–Oct
| Month | High °C | High °F | Rainy days | Verdict |
|---|---|---|---|---|
| January | 33.8 | 93 | 9% | Too hot |
| February | 35.7 | 96 | 14% | Too hot |
| March | 36.7 | 98 | 27% | Too hot |
| April | 36.0 | 97 | 45% | Too hot |
| May | 34.0 | 93 | 72% | Too hot |
| June | 31.8 | 89 | 79% | Too wet |
| July | 30.6 | 87 | 82% | Too wet |
| August | 30.4 | 87 | 81% | Too wet |
| September | 30.1 | 86 | 86% | Too wet |
| October | 30.7 | 87 | 60% | Too wet |
| November | 31.2 | 88 | 23% | Fair |
| December | 32.1 | 90 | 5% | Fair |
Verdict combines mean daytime high with rainy-day frequency. “Rainy days” is the share of days in the month with at least 1 mm of rain.
December is the driest month, with rain on 5% of days and daytime highs near 32.1°C (90°F). September is the wettest, at 86%. The warmest month is March at 36.7°C (98°F); the coolest is September at 30.1°C (86°F). The record rules out too hot in Jan–May; too wet in Jun–Oct.