Historical weather data, all-time temperature records, and monthly climate averages for Marietta, OH. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 5th in Marietta is classic shoulder-season unpredictability — the average high sits at 61° with a low of 37°, but the date has swung from a bitter 21° back in 1995 to a shirt-sleeve 85° just two years ago in 2023. There's a coin-flip chance of rain at 53%, so keep an umbrella handy, though snow is essentially off the table.
Marietta earns its stripes as a true four-season Ohio River town — the thermometer has topped out at a scorching 103° in July 2012 and plunged to a brutal -23° in January 1994, a 126-degree spread between extremes. The March Blizzard of 1993 dumped 19.5" in a single day, still the all-time snowiest on record.
Summers here are legitimately hot, with late July averaging 87° highs and the wettest stretch of the year falling in early-to-mid July — plan on afternoon storms if you're visiting then. Winter bottoms out in the third week of January with average highs of just 38°, while May through September offers the most reliably pleasant window for outdoor plans.