Climate almanac

Effingham

Illinois, United States · 39.12°, -88.54°

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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)