Historical weather data, all-time temperature records, and monthly climate averages for Saint John, IN. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 4th in Saint John sits in that classic Midwest in-between zone — expect a high around 55° and a low near 34°, with roughly a 43% chance of rain. The date has swung wildly over 72 years of records, from a balmy 80° in 2012 down to a brutal 18° in 1982. Snow is basically off the table at this point, with just a 1% chance.
Saint John's weather has real teeth on both ends of the thermometer — the all-time high hit 103° in August 1988, while January 1985 bottomed out at a bone-chilling -27°. A single July day in 1996 dumped 6.55 inches of rain, and a February 2011 snowstorm buried the town under 19 inches in one shot.
Summer is the sweet spot here, with mid-July averaging highs of 85° and also being the wettest stretch of the year at about 1.29 inches per week — pack accordingly. Winters are legitimately cold, with mid-January highs averaging just 29°. If you're planning a visit, May through September offers the most comfortable window, with highs climbing from 70° to a peak of 84° in July.