Mattoon

What is the climate like in Mattoon?

The best time to visit Mattoon is typically August – September, with trip comfort peaking in September (7.4/10). Mattoon is warmest in July, when daily highs average 86°F (30°C), and coolest in January, when lows fall to about 24°F (-4°C). The wettest month is typically July and the driest is December; the year sees roughly 45 in (1145 mm) of precipitation.

• Best time to visitAugust – September — comfort peaks in September (7.4/10)
• Warmest monthJuly — average high 86°F (30°C)
• Coolest monthJanuary — average low 24°F (-4°C)
• Wettest monthJuly (5.5 in (140 mm))
• Driest monthDecember (2.7 in (70 mm))
• Annual precipitation45 in (1145 mm)
• Based on2016-2025 daily ERA5 reanalysis data (10-year normals)
• Records fromCharleston, 18 km away (1896-2026)