Hermiston Climate: Weather by Month and Best Time to Visit
Best months for Hermiston: September, June, May.
Year at a glance
Weather by month
| Month | Avg high | Avg low | Rainfall | Rainy days | Humidity | Sunshine | Score |
|---|---|---|---|---|---|---|---|
| January | 6°C | 0°C | 39 mm | 10 | – | – | 5.1 |
| February | 10°C | 1°C | 30 mm | 8 | – | – | 5.9 |
| March | 14°C | 3°C | 33 mm | 9 | – | – | 6.7 |
| April | 19°C | 6°C | 25 mm | 6 | – | – | 7.8 |
| May | 25°C | 11°C | 24 mm | 5 | – | – | 8.4 |
| June | 29°C | 14°C | 16 mm | 3 | – | – | 8.7 |
| July | 34°C | 17°C | 4 mm | 1 | – | – | 7.6 |
| August | 33°C | 17°C | 4 mm | 1 | – | – | 7.8 |
| September | 28°C | 13°C | 8 mm | 2 | – | – | 8.8 |
| October | 19°C | 7°C | 25 mm | 6 | – | – | 7.9 |
| November | 11°C | 3°C | 36 mm | 8 | – | – | 6.2 |
| December | 6°C | -1°C | 41 mm | 10 | – | – | 5.0 |