A Pre-Monsoon Driveway Checklist for Phoenix

Last Updated: October 26, 2026

This pre-monsoon driveway checklist covers what to look at before the storms arrive, why each item matters on Phoenix soil, and which jobs are better done in spring than in August. Sundial Driveway Repair is a service company offering and managing driveway repair across Phoenix and the surrounding Valley, fulfilled by licensed and insured contractors, and these are the same things a first visit looks at.

The National Weather Service treats June 15 to September 30 as the Southwest monsoon season. At Phoenix Sky Harbor, July, August and September together average about 2.4 inches of rain, and the airport records only about four days a year with half an inch or more (NOAA climate normals). That is the point: the water arrives in a few hard bursts, onto ground that has been dry and hard for months, so it runs off fast and finds every gap.

Why does monsoon rain damage driveways?

Monsoon rain damages driveways by getting under them. A slab or an asphalt surface sheds water well; the base and soil under it do not. When a storm pushes runoff into an open crack, an unsealed joint or a gap along the edge, the water softens the base or carries fine soil away, and the section above loses support. Over one or two seasons that shows up as a panel that rocks, a corner that drops or a dip that holds a puddle. The cornerstone guide on why driveways crack and sink in Phoenix explains the soil side of this, and driveway sinking after heavy rain covers what to do if it has already happened.

The checklist

Work through these on a dry morning before mid-June. None of them needs tools beyond your eyes and a phone camera.

1. Look for open cracks and joints. Cracks wider than a pencil line, and joints where the old filler has pulled away, are paths straight to the base. Narrow cracks in sound concrete are a good candidate for driveway crack repair before the storms; gaps along the joints are covered under expansion joint repair.
2. Follow the roof water. Find where each downspout empties. One that drops water at the edge of the driveway, or onto the slab near the garage, keeps the soil under that corner wet every storm. Extensions or a splash block that sends the water onto landscaping are cheap and effective.
3. Check the sprinklers. Heads that spray the driveway edge, or drip lines that run along it, keep soil wet in a place that should stay dry. Turn them a few degrees or move the line.
4. Find where water stands. After the next time you hose off the drive, note any puddle that is still there an hour later and any spot where water runs toward the garage. Those low spots are where driveway drainage work starts.
5. Walk the edges. Look for gaps between the slab and the soil, soil that has washed out from under an edge, or asphalt edges that are crumbling. An unsupported edge breaks under a tire.
6. Look at asphalt for open cracks and potholes. Water that reaches the base of an asphalt drive turns small holes into large ones. Crack filling and pothole patching are covered under asphalt driveway repair. Sealcoating slows surface wear, but it does not close a structural crack.
7. Check gravel drives and dips. Gravel moves in a heavy storm. Where a drive crosses a roadside ditch or wash, a dip or culvert has to stay clear: the City of Scottsdale’s homeowner drainage guide says a flat dip collects sediment and a culvert in its right-of-way must be at least 18 inches across. Ruts and thin spots are the job of gravel driveway work.
8. Note flood irrigation. Where a lot takes SRP flood irrigation, the water stands against berms and slab edges for hours. Check that the berms still keep it off the driveway.
9. Photograph everything. Take a wide photo from the street, one from the garage and close-ups of any damage. If a storm does damage the drive, before-and-after photos make the insurance question easier to answer.

Which repairs are worth doing before the storms?

The repairs worth finishing before the monsoon are the ones that keep water out of the base: sealing open cracks and joints, fixing a downspout or grade problem that sends water at the slab, and patching asphalt holes. A sunken panel is worth looking at too, since every storm that runs under it can enlarge the void. Sunken driveway repair explains when a settled panel can be lifted and when it has to be replaced.

Spring is the easier time for concrete. Once June arrives, Sky Harbor’s normal daily high passes 104°F, and American Concrete Institute hot-weather practice caps concrete at 95°F when it is placed, so summer pours are planned for the cooler hours and kept damp while they cure. Work still happens in summer, but the schedule has less room. The guide to heat and Phoenix driveways covers what heat does to a slab, and the best time of year for driveway work sets out the calendar.

What to check after a big storm

After a heavy storm, walk the drive again. Look for a panel that now rocks or sits lower than its neighbor, a new gap along an edge, silt left in a dip, gravel washed into the street, or water that stood longer than usual. A change you can see within days of a storm is worth reporting while it is small. If you’d like a number on it, ask for an estimate with your photos and ZIP code, and the first visit will look at the whole drive: surface, joints, edges, where the water ran, and the garage, sidewalk and street transitions.