Cabo San Lucas in September (2027): Quietest Month, Warmest Sea & Peak Storm Season

⭐ Best September strategy: book flexible and watch the forecast. No single week is reliably storm-free, so the smart play is refundable hotels, free-cancellation tours, travel insurance, and a close eye on the tropics in the days before you travel. The reward is the year's emptiest beaches and wide-open availability.

Cabo San Lucas in September is the calendar's biggest gamble. It is the quietest month, the water is at its warmest, and you can book almost anything last-minute. It is not the cheapest month, though: live hotel rates for September 2027 run above July, August and late October. It is also the peak of hurricane season, the wettest, most humid month, and the one most likely to see a tropical system. For flexible, heat-tolerant travellers who can roll with the weather, September offers space and warm water; for anyone who needs certainty, it is the riskiest month to choose.

💰 September 2027 hotel rates (Cabo San Lucas / Tourist Corridor, 4-star):
Early September (1 to 11 Sep): ~$187–196/night · Mid-September (15 to 22 Sep): ~$198/night · Late September (25 to 29 Sep): ~$188/night
Not the cheapest month: July and August (~$169–178) and late October 2026 (~$140–162) came in lower.
Live median rates for the most-reviewed 4-star hotels in Cabo San Lucas and the Tourist Corridor (30 to 39 of 45 returned a rate each night), two adults, one night, pulled 20 October 2026. Room only, before taxes; rates for dates many months out are often placeholders.

So who is September for? We'd lean toward September for crowd-averse travellers and warm-water lovers who can stay flexible and accept weather risk. We'd book September if empty beaches matter most and you protect yourself with refundable bookings and insurance. If price is the main goal, July, August or late October came in cheaper in our live sample. We'd only steer you away if you need guaranteed sunshine for a once-in-a-lifetime trip, in which case a drier month is the safer choice. Most people don't realize that September's storms are usually brief; many days still deliver sunny mornings, and the risk is about the occasional system, not constant rain.

Temperatures and rainfall are 1991 to 2020 normals for Mexico's Servicio Meteorológico Nacional station in Cabo San Lucas; water temperatures are typical values for the month.

Temperature and Humidity

September stays hot and very humid, with daytime highs around 34°C (93°F) and warm, muggy nights near 23°C (74°F). It feels much like August, with the added weight of peak-season moisture. Early mornings are the most comfortable hours; midday is for the water or air conditioning.

Rain Pattern

September is the wettest month of the year, averaging about 114 mm (4.5 in) on roughly four rain days, but the rain typically comes as short, intense afternoon or evening storms rather than steady all-day rain. Many mornings are still bright and sunny. The bigger weather story is the chance of a tropical system; when one approaches, it can bring a day or two of heavy rain, wind, and surf before clearing.

Sea and Outdoor Conditions

The water is at its warmest of the year, 29–30°C (84–86°F), and between weather systems the sea is calm and superb for swimming and snorkeling. The caveat is storm swell: as systems pass, beaches may flag red and boat tours may pause for a day or two. Plan water activities for calm mornings, stay flexible, and always check local flag and operator status before heading out.

Cabo Weather by Month: How September Compares

September is the wettest, stormiest, and quietest month. Here is how it lines up against the rest of the year across the four factors that most shape a trip.

September is the low point of the year for crowds, though not for hotel prices. Demand is minimal all month, yet live 4-star rates for September 2027 run a little above July and August.

• The whole month is quiet. Summer family travel is over and the weather keeps casual visitors away. Beaches, tours, and restaurants are wide open. Our take: if the forecast looks clear for your dates, the elbow room is unmatched.
• Storm risk is the constant. No week is reliably storm-free, so the calendar matters less than your flexibility. Booking refundable and watching the tropics is more important than picking the "right" week.
• Some venues reduce hours. A handful of restaurants and operators take their annual break in September, so confirm openings, especially for specific tours or dining.

Expect 4-star hotels around $187–198/night in our live sample, above July and August (~$169–178) and late October 2026 (~$140–162), so September is not the bargain month it is often called. Compare live fares on our flights to Los Cabos page. September is a calculated bet: you get space and the warmest sea of the year, paired with the year's highest weather risk, so protect the trip with flexible bookings and insurance.

September is the clearest reward-versus-risk decision on the Cabo calendar. Understanding both sides lets you make it with eyes open.

The Upside

This is the quietest month to visit Cabo. The beaches are empty, tours and restaurants have room, and the warm sea is at its best between systems. It is not the cheapest month, though: live 4-star rates (~$187–198 a night) run above July, August and late October. For a flexible traveller who lands a clear stretch of weather, September delivers a crowd-free trip in the warmest water of the year.

The Risk Side

September is the statistical peak of eastern Pacific hurricane season, and Baja California Sur sits in the zone. Most September trips are fine, with brief storms rather than major systems, but the chance of a tropical storm or hurricane affecting your dates is higher than any other month. A system can mean a day or two of heavy rain, wind, beach closures, and paused tours.

How to Hedge

• Book refundable hotels and free-cancellation tours so weather changes cost you nothing.
• Buy travel insurance that covers weather disruption and trip interruption.
• Watch the tropics in the week before you travel; systems usually give several days of warning.
• Build a flexible itinerary with indoor and quick-to-rebook options, and keep water activities to calm mornings.

Whales return in mid-December, so September is a warm-water and quiet-beach month, not a wildlife one. For the full whale season, see our whale watching guide.

What we'd prioritise in September

On calm days, September is a water month: sportfishing, snorkeling, and diving all shine in the warmest sea of the year, with the Los Islotes sea lion swim reopening this month. Because weather can interrupt, we'd keep a weather-proof backup like an air-conditioned tequila tasting or cooking class ready, and book everything flexible. Save desert tours like horseback riding and ATV rides for clear, dry mornings. For the complete menu, see our guide to the best things to do in Cabo San Lucas, and our Cabo San Lucas itinerary guide for sequencing it all.

Beyond the headliners, a few experiences round out a September trip especially well, even if they don't have a dedicated guide on this site yet:

• Sportfishing charter on a calm day: marlin and dorado are still strong, and the empty water is a bonus.
• Cabo Pulmo snorkel or dive day trip: the warmest water of the year makes the marine park's reefs superb when conditions allow.
• Spa and resort day: a higher-end property with a great spa and pools makes a smart, weather-proof base for stormy afternoons.
• Air-conditioned cultural outings: a tequila tasting or a leisurely meal in San José del Cabo's historic center are reliable rainy-afternoon options.
• Sea lion swim at Los Islotes (La Paz): the colony swim reopens in September after its summer pupping closure, weather permitting.
• Sunset catamaran cruise around El Arco: warm, settling September evenings make for excellent Land's End sunsets on the calm nights between systems.

• Book everything refundable. Free-cancellation hotels and tours plus travel insurance are essential in peak storm season, not optional extras.
• Watch the tropics before you travel. Systems usually give several days of warning; check forecasts in the days before your trip and stay adaptable.
• Pick a weather-proof base. A resort with great pools and a spa makes stormy afternoons easy; note that September rates (~$187–198 a night for a 4-star) run above July and August in our live sample, so don't count on a bargain.
• Plan water activities for calm mornings. Between systems the sea is the warmest of the year; book early and confirm operator status the day before.
• Keep weather-proof backups ready. A tequila tasting, spa day, or relaxed meal in San José del Cabo covers a rainy afternoon.
• Confirm openings. Some restaurants and operators take their annual break in September, so check before counting on a specific spot.
• Hydrate and protect from the sun. Heat and humidity stay high; reef-safe sunscreen and water are essential on clear days.
• Adding Todos Santos in September? Our Todos Santos in September guide covers the Pacific side an hour north, including which businesses close for the annual break and how to plan around peak storm season.
• Adding La Paz in September? Our La Paz in September guide covers the Sea of Cortez side farther north, where the sea lions return and the water is at its warmest.
• Visiting at a different time of year? September is the quietest, stormiest month; our Cabo in August guide covers the lead-up, and Cabo in October covers the easing of storm season and the famous marlin tournaments. For the full picture of the season, see our Cabo in summer guide. For whales and dependable weather, January through March are the peak months.