Yes, meaningfully, and the gap shows up in the dew point rather than the thermometer. In July the mean dew point at Wilmington International Airport is 71.9 degrees against 63.0 at Columbus and 61.6 at Cleveland, on NOAA’s 1991 to 2020 hourly climate normals, which is the difference between an Ohio summer afternoon that gets sticky and a Wilmington summer that stays heavy at midnight.
We get this question from Ohio buyers more than almost any other climate question, usually on the first call, and usually right after someone back home told them they would hate it. The honest answer is that the difference is real and measurable, it lasts about three and a half months, and it changes what you should look at in a house here more than it changes your weekends.
It also runs the other way in winter, which nobody warns people about.
The numbers, in the one measure that matters
Relative humidity is a bad way to compare two cities, because it is relative to the temperature. Air at 70 percent humidity and 45 degrees in Cleveland in November is dry air. Air at 70 percent and 85 degrees in Wilmington in July is not. Dew point measures the actual water in the air, and it is what your body reacts to.
- July mean dew point: Wilmington 71.9 degrees, Columbus 63.0, Cleveland 61.6 NOAA NCEI, 1991-2020 U.S. Hourly Climate Normals, stations ILM, CMH and CLE, retrieved October 30, 2026
- August mean dew point: Wilmington 71.1, Columbus 62.0, Cleveland 61.2 NOAA NCEI, 1991-2020 U.S. Hourly Climate Normals, retrieved October 30, 2026
- January mean dew point: Wilmington 35.3, Columbus 21.6, Cleveland 20.3 NOAA NCEI, 1991-2020 U.S. Hourly Climate Normals, retrieved October 30, 2026
- Wilmington daily average relative humidity: 74 percent for the year, 78 percent in July, 80 percent in August National Weather Service Wilmington, Climate Overview of Wilmington, NC
- Wilmington average July high 90.0 degrees and average July low 73.0 degrees, with 45 days a year at or above 90 National Weather Service Wilmington, Climate Overview of Wilmington, NC
- 180.7 days a year when visibility falls to 5 miles in fog, and 26.1 days of dense fog National Weather Service Wilmington, Climate Overview of Wilmington, NC
A dew point in the low 70s is the threshold most people describe as oppressive. Wilmington sits above it for the whole of July and most of August. Columbus and Cleveland touch it on their worst weeks and then let go. That is the difference you will feel, and it is about nine degrees of dew point, not nine degrees of air temperature.
Look at the July low, too. An average overnight low of 73.0 degrees against a dew point of 71.9 means the air is nearly saturated by morning. Ohio summers cool off at night. This one does not, and that is the part Midwestern buyers underestimate.
The winter nobody warns you about
Now the trade. In January the mean dew point here is 35.3 degrees against 21.6 in Columbus. Wilmington’s winter is mild and damp rather than cold and dry.
That sounds unambiguously better, and mostly it is. Forty-five degrees here can also feel colder than forty-five degrees in Ohio, because damp air pulls heat off you faster than dry air does, and because you will have stopped owning a real coat. We hear the same sentence from Ohio transplants every February: it is not cold here, but I am cold.
The fog number is the other winter surprise. Visibility drops to five miles on about 181 days a year, with the dense fog concentrated in the cooler months, usually in the early morning. If you are commuting over the Cape Fear Memorial Bridge or up US 17 at 6:30 a.m., plan on it. Our Moving to Wilmington from Ohio guide walks through the rest of the adjustment, and how NC property taxes compare to Ohio covers the money side.
What the humidity changes about the house you buy
This is where the climate stops being trivia and starts costing money, and it is the part we actually get paid to know.
Start under the house. A large share of Wilmington housing stock sits on a crawl space rather than a basement or a slab, and in the older neighborhoods off Market Street and around historic downtown that is the norm. Push 72-degree dew point air into a crawl space where the surfaces sit in the sixties and you get condensation on the framing, the ducts and the insulation. That is why encapsulated crawl spaces and dedicated crawl space dehumidifiers are ordinary here rather than exotic, and why we read the crawl space before we look at the kitchen. Ask your inspector for moisture readings, not just a photo, and ask whether there is a dehumidifier, how old it is and who services it.
Then the air conditioning. Buyers arriving from Ohio often assume a bigger system is a better system. Here the opposite is frequently true. An oversized unit cools the air quickly, shuts off before it has run long enough to pull water out, and leaves you with a house that is cold and clammy. What matters in this climate is a correctly sized system with real capacity to remove moisture, and a duct system that was sealed. When we see a newer house with a brand-new condenser and a complaint about the upstairs feeling damp, the problem is usually sizing or ductwork rather than the unit.
Then the outside of the house. Exterior paint and stain cycles run shorter here than in the Midwest, decks and fences weather faster, and within a couple of miles of the water salt accelerates everything metal, from light fixtures to HVAC coils. None of that is a reason not to buy. It is a reason to ask the seller what has been done and when, and to put the answer in your maintenance budget rather than discovering it in year two. Our due diligence checklist covers the questions worth asking in the window you have.
These are 30-year normals. They describe a typical year, not the one you happen to arrive into, and a wet June or a dry August will not read like the table. The bigger honesty is about adaptation, which is wildly individual. Most Ohio buyers we work with stop noticing by their second summer. A few never do, and we have had one family sell inside three years specifically because of the summers. If a heavy summer is genuinely a deal-breaker for you, understand that no neighborhood in New Hanover, Brunswick or Pender County gets you out of it: Leland, Hampstead and Southport all sit in the same air as Wilmington, and the beach towns trade a sea breeze for more salt. Renting through one July before you buy costs less than finding out after closing. It also shows up on the power bill, which we break down in our Wilmington cost of living guide, and alongside the other trade-offs in the real downsides of living in Wilmington.
Related questions people also ask
Is Wilmington NC more humid than Columbus, Ohio?
Yes, and by a wide margin in summer. On NOAA’s 1991 to 2020 hourly climate normals the mean July dew point at Wilmington International Airport is 71.9 degrees against 63.0 degrees at Columbus, and the August figures are 71.1 and 62.0. The gap holds in winter as well, with January means of 35.3 here and 21.6 at Columbus, which is why Wilmington’s cold weather reads as damp rather than crisp.
Which months are the most humid in Wilmington NC?
July and August, with June and September close behind. The National Weather Service office in Wilmington puts the daily average relative humidity at 78 percent in July and 80 percent in August against 74 percent for the year, and dew points stay in the low 70s through both months. April is the driest month by relative humidity, which is part of why spring is the season locals recommend to visitors deciding whether they could live here.
Does the humidity in Wilmington cause mold problems in houses?
It creates the conditions for it, which is why crawl space moisture is one of the first things a good inspector looks at in this market rather than an afterthought. Warm, wet summer air condensing on cooler surfaces under a house or in a poorly ventilated attic is the common mechanism, and the usual fixes are a sealed and encapsulated crawl space, a dehumidifier sized for the space, and air conditioning that runs long enough to actually remove moisture. None of that is unusual or alarming here, but it is worth budgeting for in an older home that has never had it done.
If you are still deciding, plan one visit in July rather than two in April. It is the single most useful thing an Ohio buyer can do, and it tells you more than any number on this page. When you come, we will show you the same house twice, once on a dry day and once on a wet one, and walk the crawl space with you so you know what you are signing up for.
Sources: NOAA National Centers for Environmental Information, 1991-2020 U.S. Hourly Climate Normals, hourly dew point normals for Wilmington International Airport (USW00013748), Port Columbus International Airport (USW00014821) and Cleveland Hopkins International Airport (USW00014820), full-month means retrieved October 30, 2026; National Weather Service Wilmington, NC, Climate Overview of Wilmington, NC, relative humidity, temperature and fog tables, read October 30, 2026.
