"Peak" season for visitors to La Ventana is when the remarkably reliable north winds blow from the north down the Sea of Cortez. Usually from mid-November to mid-March, strong and steady wind usually occurs at least 4 or 5 days a week, and usually from around 11 or noon until 5 or 6 each of those days. The temperatures then are usually in the 70s during the day, though they can be in the 80s, and are usually in low 60s at night, though they can be as low as 50 at night. If you don't want to be on the beach, it is easy to get out of the wind, and in to the heat of the sun, including lounging by our courtyard pool. And even on most of the windiest days, the morning hours are usually beautifully calm, and you can stand-up paddle or kayak on the flat sea. If it is a windy day and you want still to spend the windy part of it sitting on a beach, there are beautiful beaches sheltered from the wind only 20 minutes away.
If you want to have few (or perhaps no) windy days, come between April and October. April to June at least are usually ideal temperatures with little humidty, with daytime highs usually in the mid-80s, and lows at night in the mid-60s. July through September are hot and increasingly humid.
Daytime highs at Casa Duna then are usually in the low to mid- 90s, even though temperatures in La Paz, and even elsewhere just hundreds of yards away from the shore in La Ventana often cross 100. It is usually about 10 degrees cooler at Casa Duna than other locations nearby because of the gentle sea breezes, and the house's design to capture cross-ventilation. But the evenings and early mornings are usually comfortable, both swimming pools refreshing, and you can swim in the cool-feeling mid-80s sea water.
There are some special rewards these months, with perfect conditions for scuba diving and snorkeling and swimming, some of the objectively best fishing in the world, ideal conditions for stand-up paddeling and kayaking, etc. And as Casa Duna is air-conditioned, and with many shade structures and palapas, and fans in some of the palapas, you can be very comfortable even if it gets very hot. The town is quiet then, but the little markets and at least one excellent restaurant is always open. And birdwatching is great that time of year, and you may be lucky to see baby sea turtles hatching while you are there.
April to early June might be the best time for a classic, calm and windsport-free beach vacation, (or October, though that is when there is a larger (though still small) chance of rain, and it is more humid than the spring months. Most restaurants and windsport contractors are open from November 1 through May 1, though some are open in October and May as well. Fishing, and diving and spearfishing (with instruction) is available year-round.
November through March is local high season and perhaps the most fun. The village is full, all the little restaurants and bars are open, the sea is alive with kiters and windsurfers, from beginners taking lessons to some of the best professionals in the world practicing their jumps and tricks. There is even decent surfing just 25 yards east from Casa Duna where some larger waves often break.
Most days are mostly sunny year-round. Rain is rare any time, but most likely in September-October, when it is also most humid, but usually nothing like the humidity in much of the southern U.S. It is "hurricane season" then, as it is in most tropical areas, but they are rare, and a threat mainly to the Pacific side of the Baja peninsula. And even in that "rainy" season, it is usually sunny and any clouds/rain tends to stay in the mountains that surround the village. And when it does rain, the desert comes alive almost immediately, turning green and sprouting flowers almost overnight. As regulars to La Ventana, we love it when it rains! November is usually a great month, with the reliable winds starting up most days then.
Very "cold" spells in La Ventana, which could happen anytime in December-February, usually mean a day or two in the mid- or high 60s and in the low 50s at night -- the locals wear ski parkas and wool hats when it is under 70! (and think nothing of it when it is 100...). But most winter days have highs in the high 70s or higher, and lows around 60 at night. And if it is a colder day and with strong wind, it is usually warm and sheltered and comfortable in the courtyard (and courtyard pool), shielded from the off-shore wind by the house. You can sit by our fruit trees, or behind nearby dunes, and be out of the wind and feel temperatures 10 degrees warmer than those just 30 yards away. If some in your group don't want to enjoy the windsports, they can walk for miles on the beach, watching the action on the water, or take excursions to interesting nearby sites and towns. Winter is also the best time for whale-watching in the Sea of Cortez, and swimming with whale sharks in the bay of La Paz, but whales are visible in the Sea of Cortez year-round; in fact, it is one of the best places in the world to see whales, and with the widest variety of species present anywhere. (If whale-watching is a priority, we can arrange for a boat and guide out of La Paz). But it is common to see jumping manta rays and dolphins from the patios, while watching magnificent frigate birds glide overhead and hummingbirds visit Casa Duna's flowering plants.