La Paz in September (2027): Sea Lions Return, Weather & Travel Tips

⭐ Best September window: late September, as the first hint of the season turning appears, on a clear-forecast stretch. The water is at its warmest and the beaches at their emptiest, so September rewards flexible travellers who plan around the weather.

La Paz in September is the bottom of the low season: the warmest water, the emptiest beaches, and the highest storm risk of the year, with hotel rates as steady as the rest of the year. Whale sharks are still a couple of months away (the season opens in November, most tours from mid-November or December), but sea lion swimming at Espíritu Santo's Los Islotes colony reopens on September 1, so the headline wildlife is back. It is hot, humid, and the wettest, most hurricane-prone time of year, so September is for flexible, weather-tolerant travellers, who are rewarded with the place almost to themselves.

💰 September 2027 hotel prices (La Paz, 3- and 4-star):
All of September: ~$137–143/night, essentially flat (almost every sampled night ~$143; Wed 8 September ~$137)
Live median rates for the most-reviewed 3- and 4-star hotels in La Paz (14 to 23 of 33 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 flexible warm-water adventurers who can roll with the weather and want the place to themselves. We'd book late September if you want the returning sea lions with the season just starting to turn. We'd steer you away if you want reliable weather, whale sharks (still a couple of months off), or comfortable temperatures, in which case the dry winter and shoulder months are far better. Most people don't realize September is statistically the wettest, highest-risk month here; it is not the cheapest, though: La Paz hotel rates barely change through the year, and winter nights in our sample run a little lower.

Is September a good time to visit La Paz? In short, only for flexible warm-water travellers: the water is at its warmest, the sea lions are back, and the beaches are the emptiest of the year, but it is the hottest-feeling, wettest, most hurricane-prone month, with no whale sharks yet. Here is the quick snapshot before the detail below.

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

Temperature and Humidity

September is hot and humid, the muggiest, most tropical-feeling month of the La Paz year. Daytime highs average about 36°C (97°F), and while that is a touch below the July and August highs of 38°C, the high humidity and frequent cloud build-up make it feel just as heavy. Nights are warm and sticky around 25°C (76°F). The Coromuel breezes are fading by late September as the season slowly begins to turn, but for most of the month the heat and humidity are the defining feature.

Rain Pattern

September is the wettest month of the year, averaging around five rainy days and about 81 mm (3.2 in) of rain, the high point of the summer storm season. Rain typically comes as humid afternoon and evening chubascos and, more than any other month, the outer bands or remnants of tropical systems tracking up the Baja peninsula. Mornings are often clear before the build-up, so early starts matter more than ever.

Sea Temperature in La Paz in September

The sea temperature in La Paz in September is around 30°C (86°F), the warmest of the entire year. The water is genuinely bath-like, with no wetsuit needed, and on settled days it is the best reason to be here, perfect for long, easy snorkels and swims. What typically happens is that the warm sea is the refuge from the muggy land heat, so plan water time for clear mornings before storms can build later in the day.

La Paz Weather by Month: How September Compares

September sits at the hot, wet, stormy peak of the La Paz summer, with the warmest water and the emptiest beaches of the year. Here is how it lines up against the rest of the year across the four factors that most shape a trip.

September is the quietest month of the year in La Paz. With the Mexican summer holidays over, the heat and humidity at their peak, and storm season at its height, both international and domestic visitor numbers bottom out, though hotel prices hardly move: La Paz rates are steady all year.

• All month: very low crowds and flat hotel rates (~$143/night most nights). Beaches are near-empty, tours run small, and availability is wide open, for those willing to brave the weather.
• Late September: sea lion swimming has been open since September 1 and the first sense of the season turning appears, so late month is the most rewarding window if you want returning wildlife with the crowds still away.
• Throughout: some smaller operators reduce schedules or take maintenance breaks in the deep low season, so confirm departures in advance.

Live rates for the most-reviewed 3- and 4-star La Paz hotels sit at about $137–143/night in September 2027, no lower than winter (~$122–139 from November to March), with budget guesthouses below and boutique waterfront properties above. That is well below Cabo's 4-star median for the same nights (~$187–198, its priciest stretch of the summer). Flights into Los Cabos (SJD) are at low-season fares, and La Paz is about a two-hour drive north, so book the shuttle or rental car ahead. Most guests find September a calculated trade: the warmest water and emptiest beaches of the year against the highest storm risk, best suited to flexible travellers with refundable bookings.

September's marine story is the turn: the sea lions come back. After the summer pupping closure (June 1 to August 31), swimming with the Los Islotes colony at Isla Espíritu Santo reopens on September 1, so sea lion snorkeling returns. It is the first of the headline wildlife to come back, well ahead of the whale sharks, whose season opens in November (most tours from mid-November or December). The water is also at its warmest of the year, so on settled days the snorkeling, diving, and the tail of the summer fishing are excellent.

The catch is the weather: September is the stormiest month, so any island or water day depends on a clear forecast. Some operators are on reduced low-season schedules, so confirm departures. Mobula rays are largely done by now, and whale sharks have not yet arrived, so the returning sea lions and the warm water are the draws, weather permitting.

La Paz Marine Life by Season

La Paz is a year-round wildlife destination, but the headline animal changes through the year. Here is what is on in September and how the calendar runs.

• Sea lion snorkel (returning): with swimming at Los Islotes open again from September 1, island trips to snorkel with the sea lions resume; pick a clear-forecast day and confirm the departure when you book.
• Warm-water snorkeling and diving: the year's warmest water makes island coves and reefs superb on settled, clear-forecast mornings.
• Sportfishing: the summer bite for dorado, tuna, and marlin is still strong between weather systems.

For island tours and the sea lion colony, see our Isla Espíritu Santo tours guide. The whale shark season opens in November (most tours from mid-November or December); for that season see our La Paz whale shark guide and plan a November-to-April visit.

September is the turning point of the La Paz year, so the months around it move from deep summer toward the autumn shoulder. Here is how September compares if your dates are flexible.

La Paz in September vs August

August and September are the twin peak of storm season, both hot, humid, and quiet with the warmest water. September is the wetter and slightly higher-risk of the two, but it has one advantage: sea lion swimming reopens on September 1, so the headline wildlife is back. We'd treat them as close calls on weather, leaning to late September for the returning sea lions.

La Paz in September vs October

October is the clear turn of the season: heat and storm risk ease and the sea lions are fully back, while the water stays warm; whale sharks follow when the season opens in November (most tours from mid-November or December). September has the warmest water but the worst weather, and late October hotel rates in La Paz (~$127–137) come in slightly below September's. We'd favour October for the better conditions, choosing September only for the warmest water and emptiest beaches.

La Paz in September vs November

November is a different trip entirely: warm, dry, comfortable weather, the whale shark season opening (most tours from mid-November), and the sea lions open, and La Paz hotel rates in November (~$128–139) are no higher than September's. September is hot, humid, stormy, and quiet, with no whale sharks. We'd clearly favour November for conditions and wildlife, and September only for the warmest water and an empty city.

So when is hurricane season in La Paz? The storm and hurricane season runs mid-May through November and peaks in August and September, with September typically the wettest and highest-risk month. Direct hits remain uncommon, but September demands flexible plans and a close eye on the forecast.

September concentrates the year's weather risk into one month, while offering its warmest water and emptiest beaches in return. Two things shape a September trip, and both demand flexibility.

Peak Hurricane and Storm Season

September is statistically the wettest and most hurricane-prone month in La Paz. Most days are still fine and a direct hit is uncommon, but afternoon storms are frequent and the chance of a passing or remnant tropical system is at its yearly highest. The fix is to plan for disruption: book fully refundable tours and hotels, schedule water activities for clear mornings, keep buffer days, watch the forecast daily, and seriously consider travel insurance. Some smaller operators also run reduced low-season schedules, so confirm departures ahead.

Heat and Humidity (and the Upside)

September is hot and the most humid month, with muggy days and warm nights. The familiar summer rhythm applies: water and active tours in the morning, shade and air-conditioning midday, town in the evening. The upside is substantial: the warmest water of the year, the returning sea lions, and the emptiest beaches. For travellers who can stay flexible, September offers warm-water La Paz almost to yourself, with the wildlife just beginning to return.

If that trade does not appeal, October onward eases quickly: less heat, far lower storm risk, and the sea lions fully back, with the whale shark season opening in November (most tours from mid-November or December).

There is no shortage of things to do in La Paz in September: the warmest water of the year drives the snorkeling and diving, the summer fishing holds, and the sea lions begin to return, all best planned around clear-forecast mornings. Here is how the main activities rate this month.

What we'd prioritise in September

Watch the forecast and grab the clear mornings: September is for warm-water days between systems. We'd give the edge to scuba diving and snorkeling in the year's warmest water, the returning Isla Espíritu Santo sea lion trips on a clear-forecast day, and sportfishing while the summer bite holds. Keep afternoons flexible for storms, and use the evenings for a La Paz food tour. For the complete menu, see our guide to the best things to do in La Paz.

Beyond the headliners, a few experiences round out a September trip especially well:

• Late-September sea lion snorkel: with swimming at Los Islotes open again from September 1, an island trip to swim with the returning sea lions is the most rewarding wildlife outing of the month; pick a clear-forecast day.
• Clear-morning scuba day: the warmest water of the year and lively reefs make a settled September morning excellent, and uncrowded, for diving.
• Sunrise fishing charter: the summer bite holds between systems, and an early start beats both the heat and the afternoon storms.
• Evening food and malecón crawl: with midday hot and stormy, the evenings are the time for the waterfront, dinner, and a guided food tour.
• Day trip to Todos Santos: the breezy Pacific pueblo mágico is cooler and less humid than La Paz on a muggy September day, with galleries, surf beaches, and a relaxed afternoon. Many of its businesses close for their annual break this month, so see our Todos Santos in September guide before you go.
• Heading down to Cabo San Lucas? Our Cabo San Lucas in September guide covers the southern tip of the peninsula that month: quiet low season, the warmest sea, and peak storm season.

• Book everything refundable. September is the peak of storm season, so favour fully refundable tours and hotels and keep your plans flexible around the forecast.
• Grab the clear mornings. Storms build through the day, so schedule fishing, diving, and snorkeling early and watch the daily forecast closely.
• Sea lions are back from September 1. Swimming at Los Islotes reopens after the June 1 to August 31 pupping closure; book a clear-forecast day and keep a spare day in case storms cancel the trip.
• Plan for heat, humidity, and a cool base. A hotel with a pool and strong air-conditioning matters most in the muggiest month; hydrate and protect against the sun.
• Confirm operator schedules. Some smaller operators run reduced schedules or take breaks in the deep low season, so check departures in advance.
• Don't expect a bargain, and consider insurance. La Paz hotel rates barely move through the year (~$137–143/night in September 2027 in our live sample, a little above winter), and with hurricane risk at its peak, cover for delays and cancellations is worth it.
• Skip whale sharks this month. The season opens in November (most tours from mid-November or December); if they are the goal, plan a November-to-April trip instead.
• Visiting at a different time of year? October turns the corner fast, with easing weather and the sea lions fully back, ahead of the whale shark season opening in November: see our La Paz in October guide and our La Paz whale shark guide.