Historical weather data, all-time temperature records, and monthly climate averages for Westerville, OH. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 5 in Westerville typically sits right at the edge of spring, with an average high of 60° and a low of 36°—cool enough to remind you winter isn't fully gone. The date has seen wild swings over 73 years, from a balmy 83° in 1988 down to a brutal 15° low in 1995. There's a 41% chance of rain today, though snow is nearly off the table at just 1%.
Westerville's all-time extremes tell the story of a classic Midwest city that takes its weather seriously—102° in July 1954 and -27° in January 1963 represent a jaw-dropping 129-degree range. A single day in September 1979 dumped 5.42 inches of rain, and January 2026 produced the city's snowiest day on record at 9 inches.
Summer is the main event here, with highs peaking around 86° the week of July 9–15 and staying warm through August. If you're cold-averse, avoid mid-January when average highs scrape just 35°. Rain is spread fairly evenly through the year, but late June into early July is the wettest stretch, averaging over an inch of precipitation per week.