Sonoma Weather in January

January in Sonoma typically sees daytime highs of 15°C (59°F) and nighttime lows of 4°C (39°F). Rainfall is also possible this month, so it's worth packing an umbrella. It falls within the winter season.

Rainfall in Sonoma in January

Looking at the last 30 years, the data shows about 9 days with rain, averaging 105 mm (4.1 in) for the month. When it rains this month, it tends to come down fairly heavily. Showers can be substantial even if they don't last all day.

Temperature in Sonoma in January

Sonoma in January gets highs of 15°C (59°F) during the day and drops to 4°C (39°F) at night. The month of January belongs to the winter season. The difference between afternoon and evening temperatures is usually noticeable. Nights drop to 4°C (39°F). Cold nights like these are actually great for sleeping well, as long as you have a warm enough duvet.

Sunshine in Sonoma in January

Enjoy a sunny month with about 190 hours of sunshine, making it one of the brighter months of the year despite the cool conditions.

If you're looking for dry conditions and comfortable temperatures, January may not be the ideal month to visit Sonoma. Our weather planner can help you explore destinations with more pleasant weather conditions.