What is the hottest month in Cabo San Lucas?

August, with an average high around 95°F (35°C). July to September are all hot and humid.

What is the rainiest month in Cabo San Lucas?

September, averaging about 4.6 inches (116 mm). Most other months see well under an inch.

When is the ocean warmest in Cabo?

August to October, when surface temperatures are typically around 84°F (29°C) or a little higher in September. The coolest water is usually from February to April.

Is it cold in Cabo in winter?

Days are warm, with highs around 79 to 81°F (26 to 27°C), but nights can drop into the mid 50s°F (12 to 14°C), so bring a light jacket for evenings.

Cabo San Lucas Weather by Month: Temps, Sea & Rain

Cabo San Lucas Weather by Month

Cabo San Lucas gets about 10 inches (255 mm) of rain a year, most of it between August and October. Air temperatures below are 1981 to 2010 averages for Cabo San Lucas; sea temperatures are typical monthly surface values, and the bay at Médano is usually a little warmer than the Pacific side. Use these as averages, not forecasts.

Updated September 28, 2026

January

Average high 79°F (26°C), low 54°F (12°C). Sea around 73°F (23°C). Rain about 0.5 in (13 mm), usually a single passing front. Peak whale season and peak holiday demand in the first week. Pack a sweater for evenings on the terrace.

February

Average high 80°F (27°C), low 55°F (13°C). Sea around 72°F (22°C). Rain about 0.1 in (4 mm). One of the driest, clearest months, with whales still very active. Mornings in the water on Médano feel cool; afternoons are comfortable.

March

Average high 82°F (28°C), low 55°F (13°C). Sea around 72°F (22°C). Rain about 0.1 in (2 mm). Near-perfect weather, but spring break crowds peak mid to late month. Whales remain until mid-April.

April

Average high 86°F (30°C), low 59°F (15°C). Sea around 72°F (22°C), often the coolest water of the year. Rain effectively zero. The official whale-watching season runs to the end of April (April 30 in the 2025 to 2026 notice). Easter week brings Mexican domestic visitors to the beaches.

May

Average high 89°F (32°C), low 61°F (16°C). Sea around 74°F (23°C). No measurable rain on average. Dry heat, low humidity and thinner crowds; plan beach time for mornings and late afternoons.

June

Average high 90°F (32°C), low 65°F (18°C). Sea around 76°F (24.5°C). No measurable rain on average. Hurricane season begins for Baja California Sur, though June storms rarely affect Cabo. Water warms quickly toward the end of the month.

July

Average high 94°F (34°C), low 72°F (22°C). Sea around 81°F (27°C). Rain about 0.5 in (12 mm). Humidity rises sharply. Good month for warm-water snorkelling and sportfishing; keep an eye on the tropical forecast.

August

Average high 95°F (35°C), low 75°F (24°C). Sea around 84°F (29°C). Rain about 2.0 in (52 mm), usually in short storms. The hottest month by average high and the start of peak hurricane risk.

September

Average high 93°F (34°C), low 74°F (23°C). Sea around 84 to 86°F (29 to 30°C), the warmest of the year. Rain about 4.6 in (116 mm), the wettest month. September is historically the month with the most hurricane activity near Cabo; travel insurance is sensible.

October

Average high 91°F (33°C), low 69°F (21°C). Sea around 83°F (28.5°C). Rain about 1.2 in (30 mm). Still hot and within the peak storm window early in the month; late October is when the big billfish tournaments bring crowds to the marina.

November

Average high 86°F (30°C), low 63°F (17°C). Sea around 81°F (27°C). Rain about 0.4 in (11 mm). Humidity drops, the water is still warm, and hurricane season ends November 30. A strong month for a Médano stay.

December

Average high 81°F (27°C), low 56°F (14°C). Sea around 77°F (25°C). Rain about 0.6 in (15 mm). Whale season opens December 15. The last two weeks are the busiest of the year, so book restaurants and boats ahead.