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Desert meeting the Sea of Cortez, which Cousteau called the aquarium of the world. Daytime highs in Baja California Sur run from about 24 °C in January to 32 °C in July, an annual range of roughly 8 °C.
Measured against a beach trip, the conditions hold up October to July. January is the most consistent single month: highs near 24 °C, nights around 14 °C, and roughly 14 mm of rain across the month.
The binding constraint here is rainfall — that is what rules months out, not any composite judgement. Rainfall is sharply seasonal: September averages 93 mm against 0 mm in March, so the wet season is the real planning constraint rather than heat or cold. August is the weakest month on these criteria.
What Baja California Sur is known for
- Grey whales calve in Baja's Pacific lagoons between roughly January and March
- Whale sharks aggregate in La Paz bay seasonally; Espiritu Santo has a resident sea lion colony
- The Sea of Cortez islands are a UNESCO World Heritage site for their marine biodiversity
- Todos Santos is the quiet counterpoint to Cabo's resort strip
- Hurricane season runs through late summer and early autumn on this coast
Month by month
| Month | High °C | Low °C | Precip mm | Wet days |
|---|---|---|---|---|
| January | 24 | 14 | 14 | 1.3 |
| February | 24 | 15 | 5 | 1.0 |
| March | 26 | 15 | 0 | 0.4 |
| April | 27 | 17 | 4 | 0.1 |
| May | 29 | 19 | 3 | 0.2 |
| June | 31 | 21 | 3 | 1.3 |
| July | 32 | 24 | 36 | 6.1 |
| August | 31 | 25 | 90 | 12.0 |
| September | 31 | 24 | 93 | 11.6 |
| October | 30 | 22 | 48 | 3.9 |
| November | 27 | 19 | 5 | 1.6 |
| December | 25 | 16 | 6 | 1.0 |
Ticked rows are months where every hard requirement for a beach trip is met across at least half the month.
Open Baja California on the map →
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Nearby regions
Figures are 30-year climatology sampled at La Paz, Cabo San Lucas, Todos Santos and Los Barriles, averaged across those locations, from ERA5-Land reanalysis fitted with a harmonic seasonal cycle and a trend term, evaluated for 2026. Sampling named towns rather than averaging the whole region avoids blending valley and mountain conditions into a figure true of neither. Cells are about 0.08° wide, from ERA5-Land's 0.1° grid, which is itself driven by a 0.25° (~28 km) atmospheric reanalysis — so individual valleys, sheltered bays and single summits are not resolved. In steep terrain read these as conditions for the wider area rather than for one village. They describe typical conditions, not a forecast. Read how the climatology is built.