Historical weather data, all-time temperature records, and monthly climate averages for Plainfield, IN. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 4th in Plainfield sits squarely in the uncertainty of early spring — expect a high near 58° and a low around 38°, with nearly a coin-flip chance of rain (49%). The date has swung wildly over 78 years of records, from a bitter 23° in 1975 to a shirt-sleeve 80° as recently as 2023.
Plainfield's weather has real teeth on both ends — the thermometer has touched 105° in July 2012 and bottomed out at -27° in January 1994, a brutal 132-degree swing in the all-time record books. A single day in September 2003 dropped 7.2 inches of rain, and a January 2014 snowstorm buried the area under 11.4 inches.
Summers are legitimately hot, with highs peaking around 85-86° in mid-July, while mid-January brings a cold stretch with average highs barely reaching 34°. If you're trying to dodge rain, late winter is your best bet — the wettest stretch of the year falls at the tail end of June into early July, averaging over an inch of precipitation per week.