Best Time to Hike Route 66
Month-by-month temperatures and rainfall for Route 66, Cambodia, based on 2-year climate normals.
Month-by-month weather on Route 66
| Month | Avg high | Avg low | Rainfall | Rainy days |
|---|---|---|---|---|
| January | 89°F32°C | 68°F20°C | 1 mm | 1 |
| February | 94°F34°C | 74°F23°C | 22 mm | 5 |
| March | 95°F35°C | 76°F24°C | 101 mm | 11 |
| April | 98°F36°C | 79°F26°C | 69 mm | 9 |
| May | 93°F34°C | 77°F25°C | 348 mm | 26 |
| June | 89°F32°C | 77°F25°C | 253 mm | 27 |
| July | 88°F31°C | 76°F25°C | 372 mm | 30 |
| August | 90°F32°C | 76°F24°C | 224 mm | 23 |
| September | 87°F31°C | 75°F24°C | 423 mm | 30 |
| October | 87°F31°C | 74°F23°C | 271 mm | 26 |
| November | 87°F31°C | 72°F22°C | 106 mm | 10 |
| December | 88°F31°C | 70°F21°C | 19 mm | 2 |
Highlighted rows are the recommended hiking window. Climate normals via Open-Meteo (2-year average). Mountain weather varies — always check a live forecast before you set off.
The best months to hike Route 66 are January, February, December. Expect daytime highs around 90°F32°C and nights near 70°F21°C.
It runs hot: bring sun protection, extra water and start early to beat the midday heat.