San Ramon Weather in December

With daytime temperatures of 14°C (57°F) and nighttime lows of 4°C (39°F), December in San Ramon brings moderate temperatures during the day. It is also the wettest month of the year, so pack an umbrella.

Rainfall in San Ramon in December

During the wettest month of the year, an umbrella can be your best friend to stay dry. Past climate data indicates that roughly 13 days will see rain, totalling around 111 mm (4.4 in) for the month. Individual showers can be quite heavy this month. A proper umbrella or rain jacket is worth having.

Temperature in San Ramon in December

In December, San Ramon sees moderate temperatures, with highs of 14°C (57°F). Nights drop to around 4°C (39°F). December marks the winter season. A light jacket or extra layer can be useful, especially outside the warmest hours of the day. With lows around 4°C (39°F), nights are cold. The upside is that cool, crisp nights are often the best for a deep sleep. December is typically the month with the mildest temperatures of the year.

Sunshine in San Ramon in December

The area enjoys a balanced 160 hours of sunlight, ensuring it's neither too overcast nor too sunny.

December in San Ramon can still be great, but if you prefer pleasant temperatures along with dry and sunny conditions, our weather planner can help you explore other options in the world.

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• January
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For a detailed overview over the year and the best time to visit the United States of America, check out our San Ramon's climate page.

San Ramon Temperature in December

Min Temperature 4°C (39°F)  

Max Temperature 14°C (57°F)  

Chance of Rain 44%  

Precipitation 111 mm (4.4 in)  

Rainy days 13 days  

Humidity 78% *  

Sunshine 160 hours *  

Percentage Sunshine 54% *  

* Data from: San Francisco, the United States of America (40 KM, 24 Miles).

What to Wear in San Ramon in December

The weather can swing between comfortable and chilly in December, so flexibility is key. Pack a variety of tops, at least one warm layer, and both shorts and long pants. This gives you options no matter what the day brings. Expect heavy rainfall, so bring good rain protection and waterproof bags. Bring sunglasses since you'll have some sunny periods throughout the month

What To Do in San Ramon in December

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming

5/10

Cycling

5/10

Walking

5/10

Camping

3/10

Outdoor sports

9/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit the United States of America, check out our San Ramon's climate page.

More climate data for San Ramon

Temperature Rainfall Sunshine Humidity

See the full San Ramon climate overview or explore weather in the United States of America.