The weather in March shouldn't be much of a concern, particularly if you consider Zeehag's point regarding weather forecasts on sites such as Passage Weather or SailFlow, both of which give reliable forecasts out multiple days. As with any weather forecasts, it's been my experience with both of these weather sites, they're very reliable for 72-hours out, which provide windows to hop between protected
anchorages.
San Diego to the port of entry of Ensenada (where you can check-in to Mexico, pick up your temporary
import permit or TIP, your tourist
permit or FMM, and Mexican
fishing license all at one stop) is a relatively short sail of ~15-18 hours. Once there, after checking in and getting all of your paperwork, you can plan for your next leg. The next leg many boats opt for is
Bahia de Tortugas or Turtle Bay (~265nm). Along the way, there are a number of points to duck in from the normal weather out of the northwest: Punta Colnett (~60nm);
Bahia San Quintin (~100nm); Punta El Rosario (~125nm); or, the lee of Isla Cedros (~225nm).
Fuel,
laundry and limited supplies can all be had at B. Tortugas. Sailing time from Ensenada to B. Tortugas will likely be between 55-65 hours.
The next leg many opt to sail is from B. Tortugas to Bahia Santa Maria (or Bahia Magdalena; ~225nm to Santa Maria and 242nm to B. Magdalena). An intermediate
anchorages (~65nm south) can be taken at San Hipolito or Punta Abreojos (~90nm). Partial protection can be had at Punta San Juanico (Scorpion bay; 125nm) but surf can be a problem. Anchorages at either Bahia Santa Maria or the entrance to Bahia Magdalena both offer good holding and good protection from prevailing weather out of the northwest. No services are offered at either location, however, a long tortuous channel can be taken from the entrance to B. Magdalena to Puerto
San Carlos to take on
diesel and limited supplies.
Bahia Santa Maria to Cabo Falso is ~170nm. Then it's just a short reach to the east to Cabo San Lucas and the southern reaches of the Sea of Cortez.
If you're interested in
buying an alternative for long range communication, the
Iridium Go would be a choice offering flexibility.
Cell phone reception is surprisingly available along stretches of both coasts of Baja
California and Baja
California Sur, but it is not continuous. The Irridium Go allows you to use your smart phone anywhere in the world and provides an opportunity for
WiFi connectivity, as well.