Boulder Weather in January

January in Boulder brings low temperatures, with highs of 8°C (46°F) and nights dropping to -6°C (21°F). It's also the driest month of the year, ideal for those who want to avoid rain.

Rainfall in Boulder in January

Take advantage of the dry conditions this month, with minimal rain expected, even if it's a cooler time of year. This month experiences about 5 days of snow/rain according to historical data, averaging 16 mm (0.6 in). The odd shower may pass through, but it usually doesn't amount to much. A largely dry month overall.

Temperature in Boulder in January

January in Boulder sees highs of 8°C (46°F) and lows of -6°C (21°F) overnight. Winter occurs in January. Expect a cold feel throughout the day, not just in the mornings and evenings. Warm layers are essential. Nights drop below freezing to -6°C (21°F). An extra blanket is worth packing if you're unsure about the heating where you're staying.

Sunshine in Boulder in January

The month enjoys around 215 hours of sunshine, creating mostly sunny days despite the cool temperatures.

Should you favor a climate that's both dry and comfortably warm, May, June and September typically offer the most agreeable circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.