Tires for South Florida heat and rain: what to look for
Driving in South Florida is hard on tires in its own way. There is no snow to plan for, but there is heat for most of the year, strong sun, and heavy rain that can turn a road into a sheet of water in minutes during the wet season. The right tire here is less about a brand name and more about a few things you can read and check yourself.
Heat and tire pressure
Air expands as it warms. A commonly cited rule of thumb is that tire pressure changes by about 1 psi for every 10°F change in temperature. A tire set correctly on a cool morning reads higher by mid-afternoon, and a tire that reads correctly when hot may actually be low once it cools. That is why the pressure on your driver-door placard is a cold pressure: check it before driving or after the car has been parked in the shade for a few hours. Our tire pressure and temperature calculator shows the effect for your own numbers.
Do not let air out of a hot tire to bring it down to the placard number. It will end up underinflated when it cools, and low pressure is what really builds heat inside a tire.
Sun, ozone and aging
Ultraviolet light and ozone slowly break down rubber. You see it first as fine cracks in the sidewall or between the tread blocks. Cars that are parked outside all day, vehicles that sit unused for weeks, and spares in hot trunks age sooner. Parking in shade or a garage when you can, keeping tires at the right pressure and checking the date code all help. See our guide on tire age and the DOT date code.
Rain, standing water and hydroplaning
Hydroplaning happens when a tire cannot push water out of the way and rides up on a film of water, losing contact with the road. Three things make it more likely: speed, water depth and shallow tread. You control two of them. Slowing down in heavy rain gives the tread time to clear water, and tread depth is something you can measure.
The legal and industry wear limit is 2/32 inch, where the wear bars become flush with the tread. Many tire makers and safety groups point out that wet-road grip drops well before that, and suggest considering replacement around 4/32 inch if you drive often in heavy rain. A simple home check is a quarter: put it into a groove with George Washington's head down. If you can see the top of his head, the tread is at about 4/32 inch or less. Use a penny for the 2/32 inch check, as described in when to replace your tires.
If the car does hydroplane, ease off the accelerator, keep the steering straight and avoid hard braking until the tires grip again.
What the UTQG grades mean
Most passenger tires carry a Uniform Tire Quality Grading code on the sidewall, for example 500 A A. The grades are set under a federal program and are a useful way to compare tires, as long as you know what each one measures.
- Treadwear (the number): a comparison against a reference tire graded 100, from a government test course. A 600 tire was measured to wear about twice as long as a 300 tire in that test. Each manufacturer grades its own tires, so comparisons are most reliable within one brand. It is not a mileage promise.
- Traction (AA, A, B or C): straight-line braking on wet asphalt and concrete. AA is the highest. It does not measure cornering grip or hydroplaning resistance, so a good traction grade is not a substitute for deep tread.
- Temperature (A, B or C): how well the tire resists heat buildup at speed in a laboratory test. A is the highest; C is the minimum level every passenger tire must meet. The grade assumes correct pressure and no overloading, which is one more reason to keep pressures right in the heat.
UTQG grades are not required on light truck (LT) tires, deep-tread tires or temporary spares, so you may not find them on every tire.
In our stock right now: of the 124 tire listings synced today that show UTQG grades, 112 have temperature grade A, 12 have B and 0 have C; traction grades are 16 AA, 105 A and 3 B or C. Treadwear grades run from 200 to 840. Ask about the grades of the tires in your size when you call.
All-season, summer and all-terrain tires here
Without snow or ice, South Florida drivers can choose from more tire types than drivers up north. All-season tires are the usual choice on cars, crossovers and minivans, with tread patterns designed for wet and dry roads. Summer or performance tires focus on dry and wet grip and are often fitted to sports cars; they suit the climate here, though they commonly have lower treadwear grades. Highway (H/T) and all-terrain (A/T) tires are common on pickups and SUVs; all-terrain treads add off-road grip and can be louder on the highway. Whatever the type, match the size, load index and speed rating your vehicle calls for.
A simple South Florida tire routine
- Check pressures cold about once a month and before long trips, and set them to the door placard.
- Look at the tread and sidewalls when you check pressure: cracks, bulges, nails or uneven wear.
- Check tread depth before the wet season, roughly late May, with the quarter test.
- Read the DOT date code on all four tires and the spare, and note it down.
- Have uneven wear looked at; it often points to pressure, balance or alignment. We do balancing and air fills; alignments are done at an alignment shop.
When it is time for new tires, bring your size (the tire size decoder helps) and ask about the UTQG grades of the options in stock. Prices are quoted by phone.