Rosarito in September: Weather, Sea Temperature, Rain Days and Things to Do

MEXICO · BAJA CALIFORNIA · SEPTEMBER

Rosarito in September brings 85.1°F afternoons, a 68.1°F sea and, in an average year, one day of measurable rain. The beach town on the Baja California coast is dry and bright that month, with light that lasts past 6:30 in the evening.

Air here runs from a 62.6°F low to an 85.1°F high, and October then pulls the high down to 80.8°F. If you are still choosing between months or between places, the when-to-go guides compare them.

On this page

• Rosarito weather in September85.1°F highs, 62.6°F lows and 1.0 rain day
• Can you swim in Rosarito in September?Sea temperature of 68.1°F
• How busy and how expensive is Rosarito in September?The 5% hotel lodging tax and what we could not price
• Things to do in Rosarito in SeptemberThe main beach, Popotla and Baja Studios
• A Rosarito itinerary for SeptemberTwo days built around a 6:54 p.m. sunset
• Rosarito in September vs August and OctoberHighs of 86.4°F, 85.1°F and 80.8°F side by side
• Is September a good time to visit Rosarito?The verdict, with August and October as alternatives

Every air temperature and rain figure here comes from the Presa Rodriguez station (SMN station 02038), an inland reservoir near Tijuana about 9 miles from the coast. It is the nearest official series. Rosarito’s own beachfront is not separately measured, and it likely runs milder than these numbers, with more coastal fog.

Rosarito weather in September

The official 1991-2020 normals from Mexico’s national weather service (SMN, part of CONAGUA) put September’s average high at 85.1°F and the average low at 62.6°F. Precipitation for the whole month is 0.14 inches. These are station readings, not a reanalysis grid, and the thermometer is the inland reservoir named above.

An average September records 1.0 days of measurable rain by SMN’s count (the station sheet does not publish its threshold). That is one wet day in the whole month, so a plan rarely needs a rain backup.

From dawn to the afternoon peak the station swings 22.5 degrees. Pack shorts for the afternoon and a fleece or light jacket for the evening, since coastal fog is more likely on the beachfront than at the inland station.

On September 15 the day lasts about 12 hours 24 minutes. Sunrise falls near 6:31 a.m. and sunset near 6:54 p.m. Pacific Daylight Time (converted from the UTC times at sunrise-sunset.org). Plan the sunset on the sand for about 6:54 p.m.

Can you swim in Rosarito in September? Sea temperature

Open-Meteo’s Marine API puts the sea surface off Rosarito at 68.1°F in September, averaged over 2015-2024. That figure is a mean of daily maxima, so it runs a shade warmer than a 24-hour mean. A table built on full-day averages will read a little lower.

Yes, you can swim. The water is cool, though: on an 85.1°F afternoon the air sits 17.0 degrees above the sea. A quick dip is refreshing, and anyone planning to stay in for an hour will want a wetsuit.

We hold no September wind or swell data for Rosarito, so we cannot say how the surf behaves. Check a marine forecast on the morning you plan to swim.

How busy is Rosarito in September? Crowds and prices

We found no occupancy series and no monthly hotel-rate data for Rosarito, so we place no month on a price ladder. What the calendar and climate do show is a stable stretch: average highs of 86.4°F in August, 85.1°F in September and 80.8°F in October.

We also have no verified booking lead time for Rosarito hotels, so we give no weeks-ahead figure. Check availability for your exact dates with the property and take a cancellable rate when one is offered.

Baja California charges a lodging tax (Impuesto sobre Servicios de Hospedaje) of 5% on hotel stays and 7% on motels in 2026, and 5% on bookings made through digital platforms. The rates come from the state’s Ley de Hacienda and were checked against 2026 tax tables. We could not verify whether municipal charges are added, so we give no combined figure.

Because the tax is a percentage of the room, an oceanfront upgrade raises the tax as well as the rate. Beyond that, we found no verified September price for hotels, meals or tours, so no other line gets a number.

Things to do in Rosarito in September

September keeps the coast open all day: 85.1°F highs, one rain day on average and a 68.1°F sea. October, by comparison, averages 2.5 rain days. The daylight, 12 hours 24 minutes on the 15th, leaves room for a beach morning, an afternoon drive and a sunset.

Rosarito’s main beach runs along the town’s oceanfront and is the destination’s principal draw. The fishing village of Popotla sits nearby. Baja Studios, built in 1997 by 20th Century Fox as Fox Studios Baja for the filming of Titanic, stands on the coast at Rosarito. The production, announced in 1996, is estimated to have cost the studio around 20 million dollars to build. We could not verify visitor hours or ticket prices for Baja Studios or Popotla, so confirm before you drive over.

Between August and September the sea moves 0.2 degrees (68.3°F to 68.1°F) and the average high moves 1.3 degrees (86.4°F to 85.1°F). A beach plan built for August holds in September.

We found no verified list of free attractions for September, so we name none. The oceanfront beach is the one stop with no opening hours to check. Ask locally about entry costs at Popotla and Baja Studios.

Rosarito itinerary for September

Day one: drive down the Tijuana-Ensenada toll highway (the Scenic Highway, the main paved route linking Rosarito to both cities) and walk the oceanfront early, while the air is still near the 62.6°F low. Swim in the afternoon near the 85.1°F high. Be on the sand for sunset at about 6:54 p.m., with a layer in the bag.

Day two: spend the morning in the fishing village of Popotla, then visit Baja Studios, the Titanic set built in 1997, after confirming its hours. Rain arrives on 1.0 days in an average September, so if it does, move the beach hours to another afternoon.

Rosarito in September vs August and October

September’s average high sits 1.3 degrees below August’s and 4.3 degrees above October’s. Lows fall 2.0 degrees from August, then a further 5.0 degrees into October. Rain days go from 0.4 to 1.0 to 2.5, and the sea drops 2.5 degrees between September and October. Air figures are SMN normals for 1991-2020. Sea figures come from the marine API over 2015-2024.

Move four weeks earlier, into August, and you get highs 1.3 degrees warmer, a sea 0.2 degrees warmer and 0.4 rain days instead of 1.0. Move four weeks later, into October, and you get lows of 57.6°F, 2.5 rain days and water at 65.6°F.

Is September a good time to visit Rosarito?

Yes, for a beach-and-coast trip built around afternoons: 85.1°F highs, 1.0 rain day and a sea at 68.1°F. It suits anyone who will pack a layer for 62.6°F lows. It suits less anyone who wants swimming water warmer than 68.1°F.

For the warmest afternoons and the fewest rain days, August (86.4°F highs, 0.4 rain days) is the alternative. For cooler air, October brings 80.8°F highs, at the cost of 2.5 rain days and a 65.6°F sea.

September holds August-like weather (0.14 inches of rain in the month against 0.04) while sitting just short of October’s 0.50 inches.

The last word

Before the calendar, read the U.S. State Department’s Mexico advisory: it lists Baja California at Level 3, Reconsider travel, in the version reissued May 29, 2026. Its own text says the only travel restrictions in the state are in Mexicali Valley and none apply elsewhere in the state, and its homicide warning names non-tourist areas of Tijuana. If that reads acceptably to you, book the dates, pack the fleece and be on the sand by sunset at 6:54 p.m.

Sources & data

• Air temperature, precipitation and rain days for August, September and October · Servicio Meteorologico Nacional (CONAGUA), normales climatologicas 1991-2020, station 02038 (Presa Rodriguez, Tijuana) · checked Sep 30, 2026
• Sea surface temperature, mean of daily maxima 2015-2024 · Open-Meteo Marine API · checked Sep 30, 2026
• Daylight, sunrise and sunset on Sept 15 · sunrise-sunset.org, converted to America/Tijuana · checked Sep 30, 2026
• Lodging tax rates for 2026 · Ley de Hacienda del Estado de Baja California, chapter V, confirmed against 2026 tables from El Contribuyente and J.A. Del Rio · checked Sep 30, 2026
• Baja Studios · local press (eSpiral TV, June 15, 2026; Wikipedia “Baja Studios”), corroborated by the Playas de Rosarito municipal government · checked Sep 30, 2026
• Travel advisory · U.S. Department of State, Mexico Travel Advisory, reissued May 29, 2026 · checked Sep 30, 2026
• Editorial admission: we found no occupancy series, hotel rates, booking lead times, attraction hours, admission prices, wind or swell data, or verified September event dates for Rosarito, so none appear. The beachfront is not measured separately from the inland station.