The Sea of Cortez has a sailing season. Understanding it makes the difference between a trip you planned well and one you wish you had.
The short answer: November through April is the sweet spot. The winds are consistent, the temperatures are comfortable, the anchorages are manageable, and the wildlife is at its most active.
Here is the longer answer — month by month, from someone who sails these waters every season.
October
October is transition month. The summer heat is breaking, the chubasco season — the violent summer convective storms — is winding down, and the first northerly winds of the season are beginning to establish. Water temperature is still warm, often above 28 degrees Celsius.
October is good for sailors who want to beat the crowd and don’t mind some unpredictability. The season is starting but not yet reliable. MOS begins its La Paz program in October for this reason — early season sailors get the anchorages to themselves.
November
November is when the Sea of Cortez comes into its own. The northerly winds establish, the chubascos are done, and the sailing becomes consistent. Temperatures are ideal — warm days, cool nights, water temperature dropping into the mid-20s. The anchorages fill up as the cruising fleet arrives from the Pacific.
This is one of the best months to sail. Consistent wind, good visibility, extraordinary wildlife. Whale sharks aggregate near La Paz in November and December — snorkeling with whale sharks in the morning and sailing in the afternoon is a normal day.
December and January
Peak season. The anchorages are busy, the winds are reliable, and the sailing is at its best. Northerly winds of 15 to 25 knots are the norm — enough to sail well, not enough to intimidate.
These are also the months when the humpback whales arrive in the southern Sea of Cortez. Blue whales — the largest animals on earth — feed in the deep water off the east coast of Baja. If you time it right you will see things from the cockpit of a sailboat that most people never see in a lifetime.
The downside of December and January is availability. Charter bases in La Paz book out early and the popular anchorages — Ensenada Grande, Caleta Partida, Balandra — can feel crowded on weekends. Book early if you’re coming in this window.
February and March
The shoulder of peak season. Winds remain consistent, temperatures are perfect, and the cruising fleet begins to thin as some boats start moving south. February and March offer the best combination of reliable conditions and manageable anchorage density.
This is Captain Mike’s preferred window for the MOS Cruise and Learn program. Conditions are predictable enough to plan passages, varied enough to teach real seamanship, and spectacular enough to make every day memorable.
April
April is late season. The winds begin to shift and lighten as the Sea of Cortez transitions toward summer. Temperatures climb. The cruising fleet disperses — some boats heading north toward the Pacific Northwest, others staying in the southern Sea of Cortez.
April sailing is still excellent but requires more flexibility. Light air days are more common and the afternoon thermal — the reliable afternoon breeze that characterizes the best Sea of Cortez sailing days — is less consistent.
May
May is the end of the reliable sailing season. The Sea of Cortez is transitioning to summer conditions — hot, humid, with the first signs of the convective weather that defines June through September. MOS closes its La Paz program at the end of May.
Experienced offshore sailors continue through May and into June, but for most visitors the window is closed.
June through September
Hurricane season and chubasco season overlap. The chubascos — fast-building convective thunderstorms that can produce violent squalls with little warning — are the primary hazard. Sea surface temperatures exceed 30 degrees Celsius in some areas. Most charter companies suspend operations or severely limit them during this period.
Captain Mike does not operate the MOS program in the Sea of Cortez during this window. The risk profile is outside what he will take a student group into.
What to Book Around
Wildlife: whale sharks November through February, humpback whales December through March, blue whales January through March, manta rays year round, sea lions year round.
Anchorages: busiest December through February, quietest October and April.
Wind: most consistent November through March, lightest in April and October.
Temperatures: coolest January and February with nights requiring a jacket, warmest in April and October.
The bottom line: if you have one window to sail the Sea of Cortez, make it February or March. If you want whale sharks, add November or December. If you want the anchorages to yourself, go in October.
MOS runs the liveaboard NauticEd Bareboat Charter Master program out of Marina Costa Baja, La Paz from October through May. One group per month.
Adjust Your Sails to Adventure.