Mill Valley Weather in January

January in Mill Valley brings moderate temperatures, with daytime highs of 14°C (57°F) and nights around 6°C (43°F). Quite a bit of rainfall is expected, around 122 mm (4.8 in), so pack an umbrella.

Rainfall in Mill Valley in January

Analyzing past climate data, one can expect approximately 9 days of rain, averaging 122 mm (4.8 in). Rainfall intensity is on the higher side this month. Expect more substantial showers rather than light, passing rain.

Temperature in Mill Valley in January

Temperatures in Mill Valley in January top out at 14°C (57°F) and drop to 6°C (43°F) overnight. The difference between afternoon and evening temperatures is usually noticeable. With lows around 6°C (43°F), nights are cold. The upside is that cool, crisp nights are often the best for a deep sleep.

Sunshine in Mill Valley in January

The area enjoys a moderate level of sunlight, with around 186 hours. It's a good balance between sunny and cloudy days.

If you prefer dry days with pleasant temperatures, January may not be the ideal month to visit Mill Valley. Our weather planner can help you explore destinations with more pleasant weather conditions.