Climate almanac
Half Moon Bay
California, United States · 37.46°, -122.43°
What is the climate like in Half Moon Bay?
The best time to visit Half Moon Bay is typically April – November, with trip comfort peaking in September (8.1/10). Half Moon Bay is warmest in September, when daily highs average 66°F (19°C), and coolest in February, when lows fall to about 49°F (9°C). The wettest month is typically January and the driest is June; the year sees roughly 22 in (556 mm) of precipitation.
- Best time to visitApril – November — comfort peaks in September (8.1/10)
- Warmest monthSeptember — average high 66°F (19°C)
- Coolest monthFebruary — average low 49°F (9°C)
- Wettest monthJanuary (4.5 in (114 mm))
- Driest monthJune (0.1 in (3 mm))
- Annual precipitation22 in (556 mm)
- Based on2016-2025 daily ERA5 reanalysis data (10-year normals)
- Records fromHalf Moon Bay, 2 km away (1939-2026)