Climate almanac
Washington
Illinois, US · 40.70°, -89.41°
What is the climate like in Washington?
The best time to visit Washington is typically August – September, with trip comfort peaking in September (7.5/10). Washington is warmest in July, when daily highs average 85°F (29°C), and coolest in January, when lows fall to about 21°F (-6°C). The wettest month is typically May and the driest is November; the year sees roughly 41 in of precipitation.
- Best time to visitAugust – September — comfort peaks in September (7.5/10)
- Warmest monthJuly — average high 85°F (29°C)
- Coolest monthJanuary — average low 21°F (-6°C)
- Wettest monthMay (5.1 in)
- Driest monthNovember (2.2 in)
- Annual precipitation41 in