Climate almanac
Effingham
Illinois, United States · 39.12°, -88.54°
What is the climate like in Effingham?
The best time to visit Effingham is typically August – October, with trip comfort peaking in September (7.3/10). Effingham is warmest in July, when daily highs average 88°F (31°C), and coolest in January, when lows fall to about 26°F (-3°C). The wettest month is typically July and the driest is September; the year sees roughly 48 in (1213 mm) of precipitation.
- Best time to visitAugust – October — comfort peaks in September (7.3/10)
- Warmest monthJuly — average high 88°F (31°C)
- Coolest monthJanuary — average low 26°F (-3°C)
- Wettest monthJuly (5.5 in (139 mm))
- Driest monthSeptember (2.9 in (74 mm))
- Annual precipitation48 in (1213 mm)
- Based on2016-2025 daily ERA5 reanalysis data (10-year normals)
- Records fromEffingham 3sw, 7 km away (1893-2020)