Rainy Season in Los Cabos: What Property Owners Need to Know About Chubasco Season

Cabo gets less than 10 inches of rain in an average year — less than Phoenix, less than Las Vegas, less than almost anywhere you'd associate with a "rainy season." But Baja's rain doesn't arrive in polite afternoon showers. It shows up all at once, as chubascos — violent summer storms that can dump 2-4 inches in a single afternoon — and if your property isn't prepared, one storm can do more damage than a year of desert sun.

What Is a Chubasco?

A chubasco is the local term for the sudden, intense thunderstorms that hit the Baja California Sur cape region during summer and early fall. The word comes from the Spanish for "squall," and the experience lives up to it — clear blue skies at noon, towering cumulonimbus clouds building over the Sierra de la Laguna by 2 PM, and a wall of rain, wind, and lightning by 4 PM that turns the desert into a temporary river system.

Chubascos are not hurricanes. They're convective storms driven by warm sea-surface temperatures and monsoon moisture from the Pacific and the Gulf of California. They typically last 30 minutes to three hours, and when they pass, the sky clears and the sunset is spectacular. But in that window, they can drop more water than the entire preceding month, and the hard-packed desert soil simply can't absorb it all at once.

When and How Much It Rains

The numbers are deceptively small. Cabo San Lucas averages about 6-7 inches of annual rainfall. San Jose del Cabo gets slightly more — 8-10 inches — because it's closer to the Sierra de la Laguna and catches more orographic rainfall. The Pacific side (Cerritos, Todos Santos) gets a bit more still.

But the timing is the point. Roughly 80-90% of that annual total falls between July and October. September is historically the wettest and most active month, overlapping with the peak of the Eastern Pacific hurricane season. The driest months — December through May — may see zero measurable rainfall.

Hurricanes vs. Chubascos

Hurricanes get the headlines, but chubascos cause more cumulative property damage in Los Cabos because they happen more often. A significant hurricane makes direct landfall on Cabo perhaps once every 7-15 years (Hurricane Odile in 2014 was the benchmark event). Chubascos hit 15-30 times per season. The distinction matters for property planning: hurricane prep is about wind protection and window shutters; chubasco prep is about drainage, waterproofing, and humidity management.

For the hurricane-specific prep checklist, see our hurricane season guide.

Understanding Flood Risk in Los Cabos

Flash flooding in Los Cabos follows the arroyos — the dry creek beds and washes that channel water from the mountains to the sea. The arroyo system is extensive and largely unmapped on typical real estate listings. During the dry season, arroyos look like nothing — shallow ditches, rocky terrain, dusty depressions that cross roads and run between developments. During a major chubasco, those same arroyos become violent channels carrying fast-moving water, rocks, sediment, and debris.

Areas with Higher Flood Exposure

• Downtown San Jose del Cabo — the historic center sits in a natural drainage basin. The Arroyo San Jose, which runs through the heart of town past the estuary to the ocean, has flooded the downtown area during major storm events. The 2014 Hurricane Odile flooding was concentrated here.
• Lower-elevation lots in Fonatur — some areas of the planned neighborhood sit near arroyo channels that activate during heavy rain.
• Parts of El Tezal — the developing corridor between downtown Cabo San Lucas and the Corridor has mixed drainage infrastructure, and some newer construction was built without full arroyo mapping.
• Beachfront properties anywhere — storm surge during a hurricane or tropical storm is a separate risk from arroyo flooding, and beach erosion during heavy surf events can undermine foundations.

Higher-elevation communities — Pedregal (up on the hillside), Querencia (elevated plateau), most Corridor developments set above the highway — have less flood exposure because water runs downhill. They're not immune to drainage problems on their own lots, but they're above the arroyo system.

Flood Due Diligence Before You Buy

• Request a topographic survey (plano topográfico) that shows the property's elevation relative to the nearest arroyo.
• Ask the development's HOA or management company specifically about drainage infrastructure and arroyo management. Do they maintain drainage channels? Have they invested in retention basins?
• Talk to neighbors who've been through at least one rainy season. Did water enter any units? Did the parking areas flood? Did the access roads wash out?
• Review the property insurance policy for flood coverage specifics — what's covered, what's excluded, and whether arroyo flooding is treated differently from hurricane flooding. Our home insurance guide breaks down the policy landscape.

Mold: The Real Rainy-Season Enemy

For most property owners in Los Cabos — especially absentee owners who aren't here during the summer — mold is a bigger practical concern than flooding. When humidity spikes to 80-90% during chubasco season and a home is closed up with no air circulation, mold can colonize closets, upholstered furniture, leather goods, mattresses, and even walls within a few weeks.

I've walked into homes in October where the owner left in May and the entire closet was green. Not because of a leak — just trapped humid air in a sealed space for four months.

Prevention Checklist for Absentee Owners

• Keep air moving. Set your property manager to run ceiling fans and HVAC on a periodic schedule, or at minimum open windows for cross-ventilation during dry days between storms.
• Use dehumidifiers. Portable dehumidifiers in bedrooms and closets are the single most effective anti-mold investment. Most property managers will empty them on their weekly rounds.
• Don't seal the house completely. The instinct to lock everything tight when you leave is understandable, but a hermetically sealed home in tropical humidity is a mold incubator. Tilt-open windows, screened vents, or timed fan cycles keep enough airflow to prevent the worst.
• Treat problem areas before leaving. Spray closets, bathrooms, and under-sink areas with a mold-preventive treatment before departing for the summer.
• Check for leaks before rainy season. A dripping pipe or failed window seal that's merely annoying in February becomes a mold factory by August. Have your property manager or a plumber check all water penetration points in June.

If you're managing your property from afar during these months, our rental management companies guide covers the firms that handle seasonal property management alongside rental bookings.

Pre-Season Property Prep Checklist

Whether you're here during rainy season or managing from the US/Canada, this is what should happen before July:

1. Clear roof drains and gutters. Flat roofs are standard in Cabo, and most use scuppers or internal drains. A single clogged drain on a flat roof turns the roof into a swimming pool — and the weight of ponded water can exceed the roof's structural capacity.
2. Inspect window and door seals. Desert UV degrades sealant and weatherstripping fast. Re-caulk any gaps around windows, sliding doors, and exterior penetrations.
3. Check the lot's drainage grading. Water should flow away from the foundation and toward the street or a designated drainage channel, not toward the house. If grading has shifted (common on newer construction as soil settles), get it re-graded before the rains start.
4. Clear any arroyos or drainage channels on your lot. Remove debris, fallen vegetation, and accumulated sediment so water can flow freely.
5. Test your sump pump if you have one. Basement-level garages and lower-floor utility rooms in some developments rely on sump pumps that may not have run since last season.
6. Secure outdoor furniture and landscaping. Chubasco winds regularly reach 40-60 mph. Anything not bolted down becomes a projectile — patio umbrellas, planters, pool equipment.
7. Confirm your insurance coverage is current. Don't find out your policy lapsed after the storm. Verify coverage dates, deductibles, and the claims process before you need it.

For the full year-round maintenance calendar, see our seasonal maintenance guide.

What Rainy Season Actually Looks Like

I want to be clear that rainy season in Cabo is not four months of misery. Most days are hot, sunny, and dry. Storms typically build in the late afternoon, deliver their payload, and clear out by sunset. Morning beach days are almost always unaffected. The desert turns green in a way that's genuinely beautiful — wildflowers, green hillsides, and full arroyos that become temporary waterfalls cascading to the sea.

Real estate prices during chubasco season tend to dip slightly as the tourist crowd thins and the snowbird set heads home. If you're timing your purchase, summer can be advantageous — less competition, motivated sellers, and you'll see the property in its most demanding weather conditions rather than the flattering dry-season showcase.

Frequently Asked Questions