Climate almanac
Salem
Illinois, United States · 38.63°, -88.95°
What is the climate like in Salem?
The best time to visit Salem is typically August – October, with trip comfort peaking in September (7.2/10). Salem is warmest in July, when daily highs average 88°F (31°C), and coolest in January, when lows fall to about 27°F (-3°C). The wettest month is typically April and the driest is November; the year sees roughly 48 in (1212 mm) of precipitation.
- Best time to visitAugust – October — comfort peaks in September (7.2/10)
- Warmest monthJuly — average high 88°F (31°C)
- Coolest monthJanuary — average low 27°F (-3°C)
- Wettest monthApril (5.3 in (134 mm))
- Driest monthNovember (3.0 in (77 mm))
- Annual precipitation48 in (1212 mm)
- Based on2016-2025 daily ERA5 reanalysis data (10-year normals)
- Records fromSalem, 2 km away (1932-2026)