Humidity, Mildew and the Orlando Home

Orlando air stays damp most of the year and wettest from June through September. A room by room look at where moisture lingers, what routine cleaning handles, and when the problem is bigger than cleaning.

In Orlando, the air does a lot of the work of making a home feel grimy. Towels stay damp, closets pick up a musty smell, and the dark line along the bottom of a shower door comes back faster than seems fair. None of that means a home is dirty in the usual sense. It means the home is in a humid climate, and the cleaning routine has to account for it.

How humid Orlando really is

Florida Climate Center records, kept by Florida State University, put Orlando's average morning relative humidity at 88 percent and afternoon humidity at 55 percent across the year. In August and September mornings average 91 percent and afternoons 61 percent.

Rain feeds it. The normal annual total is 51.45 inches, and June through September bring about 29.6 of those inches, with June the wettest month at 8.05. Heat adds to the load: the normal June high is 90.8 degrees and the normal low 71.6, so the air rarely gets the cool, dry break that lets a bathroom dry out overnight.

Spring is the exception. April afternoons average just 47 percent humidity, the driest of the year, which makes March through May the easiest time to dry out closets and storage.

Bathrooms: where moisture lingers longest

A bathroom in Orlando's summer air can stay damp for hours after a shower. The fix is mostly airflow and habit, with cleaning on a steady schedule so surface mildew never gets a foothold.

Closets, shoes and linens

Closets are the quiet trouble spot in a humid home, especially closets on exterior walls and in rooms where the air conditioning vent is far away. Leave closet doors cracked, avoid packing clothes tightly, and store linens and off-season clothes only after they are completely dry. Leather shoes and bags kept in the dark can develop a white bloom over a wet summer; wipe them and give them air.

Use the dry spring months to empty one closet at a time, wipe the shelves and floor, and put things back loosely.

Kitchens and laundry

Damp gaskets are the main concern. Wipe the rubber seal on the front-load washer after the last load and leave the door cracked. Do the same with the dishwasher. Empty the drip pan or tray under the refrigerator if it has an accessible one, and wipe the inside of the sink cabinet if you see condensation on the pipes.

Apartments get the same damp air with fewer windows. About half of Orlando's housing units are in buildings of five or more units, and an interior bathroom or laundry closet with no window depends entirely on its fan.

What cleaning can do, and where it stops

Routine cleaning handles surface mildew on tile, grout, caulk, shower doors and window sills. A Recurring House Clean on a weekly or bi-weekly plan keeps those surfaces clean through the wet months, and a One-Time Deep Clean adds hand washed baseboards, wet-wiped blinds and vents wiped in place. The recurring cleaning guide covers frequency.

Cleaning does not fix moisture coming from somewhere it should not. Spots that return within days, soft or stained drywall, a musty smell from inside a wall, or growth behind caulk point to a leak or a ventilation problem. That calls for a plumber, an HVAC technician or a mold specialist, not a cleaner.

More for Orlando homes

Sources

  1. Florida Climate Center (Florida State University), relative humidity normals: climatecenter.fsu.edu/products-services/data/other-normals/relative-humidity
  2. National Weather Service Melbourne, Orlando December climate summary with yearly normals (1991 to 2020): www.weather.gov/media/mlb/climate/mcoDEC.pdf
  3. National Weather Service Melbourne, Orlando June climate summary (1991 to 2020 normals): www.weather.gov/media/mlb/climate/mcoJUN.pdf
  4. U.S. Census Bureau, American Community Survey 2024 1-year, table B25024 Units in Structure (via Census Reporter): censusreporter.org/data/table/?table=B25024&geo_ids=16000US1253000
FAQ · Humidity and mildew

Frequently Asked Questions

The questions Orlando homeowners ask most often about this topic, answered plainly.

Mostly humidity. Orlando mornings average 88 percent relative humidity, and 91 percent in August and September, so grout stays damp long enough for surface mildew to grow. Running the fan, squeegeeing tile and scrubbing grout on every cleaning keep it from settling in.
June through September. Those months bring about 29.6 inches of Orlando's 51.45 inches of normal yearly rain, and morning humidity peaks at 91 percent in August and September. Bathrooms, closets and laundry areas need the most attention then.
A cleaner handles surface mildew on tile, grout, glass and sills as part of a regular visit. Growth inside walls, under flooring or behind caulk, or anything tied to a leak, is beyond cleaning and needs a specialist who can find and fix the moisture source.
Spring, when the air is driest. Florida Climate Center records show April afternoons averaging 47 percent humidity and March 50 percent, against 61 percent in late summer. Empty, wipe and air out one closet at a time and put things back loosely.
Yes. Air conditioning removes moisture as it cools, which is part of why closed-up Orlando homes feel drier than the air outside. Keep the filter clean and make sure bathrooms and laundry areas have working exhaust fans, since the AC alone cannot keep up with a steamy shower.

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