Grass Valley

What is the climate like in Grass Valley?

The best time to visit Grass Valley is typically June – September, with trip comfort peaking in July (9.3/10). Grass Valley is warmest in July, when daily highs average 93°F (34°C), and coolest in December, when lows fall to about 38°F (3°C). The wettest month is typically March and the driest is July; the year sees roughly 62 in (1578 mm) of precipitation.

• Best time to visitJune – September — comfort peaks in July (9.3/10)
• Warmest monthJuly — average high 93°F (34°C)
• Coolest monthDecember — average low 38°F (3°C)
• Wettest monthMarch (12 in (295 mm))
• Driest monthJuly (0.0 in (1 mm))
• Annual precipitation62 in (1578 mm)
• Based on2016-2025 daily ERA5 reanalysis data (10-year normals)
• Records fromNevada City, 6 km away (1893-2026)