Weather history and climate summary information is available for the following locations:
- Bellingham
- Grant County Airport
- Seattle
- Spokane
- Tacoma
- Walla Walla
- Yakima
Warmest August Days
The warmest August days in Washington are:
| Walla Walla, Washington | 1961 | 113°F |
| Grant County Airport, Washington | 1961 | 111.9°F |
| Walla Walla, Washington | 1998 | 111.2°F |
| Walla Walla, Washington | 1977 | 109.9°F |
| Walla Walla, Washington | 1984 | 109°F |
Coldest August Days
The coldest August days in Washington were:
| Spokane, Washington | 1992 | 34.9°F |
| Spokane, Washington | 1964 | 35.1°F |
| Yakima, Washington | 1993 | 36°F |
| Yakima, Washington | 1980 | 36°F |
| Spokane, Washington | 1993 | 36.9°F |
Wettest August Days
The wettest single days in August occurred:
| Walla Walla, Washington | 1987 | 6.1 inches |
| Bellingham, Washington | 1978 | 4.4 inches |
| Spokane, Washington | 1993 | 2.1 inches |
| Walla Walla, Washington | 1992 | 1.8 inches |
| Bellingham, Washington | 1975 | 1.7 inches |