San Bernardino Weather in December
San Bernardino in December averages 33°C (91°F) during the day and 22°C (72°F) at night. Keep in mind that quite a bit of rainfall is expected this month.
Rainfall in San Bernardino in December
Past climate data indicates that roughly 7 days will see rain, totalling around 165 mm (6.5 in) for the month. Rainfall tends to arrive in short, intense showers this month. Rain days are few, but the showers can be surprisingly heavy.
Temperature in San Bernardino in December
San Bernardino in December gets highs of 33°C (91°F) during the day and drops to 22°C (72°F) at night. It's usually most comfortable outside during the morning and later in the day. At 22°C (72°F) overnight, nights are warm enough to sit outside comfortably in light clothing.
Sunshine in San Bernardino in December
The days are predominantly sunny, with an estimated total of around 297 hours of sunshine. These sun-filled days are perfect for playing sports, visiting parks, or going for a bike ride.If you prefer dry days with pleasant temperatures, December may not be the ideal month to visit San Bernardino. Our weather planner can help you explore destinations with more pleasant weather conditions.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Paraguay, check out our San Bernardino's climate page.
San Bernardino Temperature in December
Min Temperature
22°C (72°F)
Max Temperature
33°C (91°F)
Chance of Rain
23%
Precipitation
165 mm (6.5 in)
Rainy days
7 days
Humidity
68% *
Sunshine
297 hours *
Percentage Sunshine
*
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in San Bernardino typically stay consistent throughout December, with daily highs averaging around 33°C (91°F). Nights are warm, with lows typically ranging from 21°C (70°F) to 23°C (73°F).
Average temperatures in December
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in December
Historical weather for San Bernardino in December
Browse day-by-day weather records for San Bernardino spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
San Bernardino historical weather extremes in December
Our historical data for San Bernardino spans 1985 to 2025, revealing these weather extremes.
- The warmest day in December was on December 9, 1985, with a maximum of 41°C (106°F).
- The coldest December day was on December 4, 2001, with a maximum of 21°C (70°F).
- The coldest night in December in San Bernardino was on December 14, 2010, with a minimum of 10°C (50°F).
Best Places in Paraguay in December
Find out more about the weather in Paraguay and which places have the best travel conditions in this month. See all of Paraguay in December →
perfect weather
pleasant
tolerable
unpleasant
poor
What to Wear in San Bernardino in December
Warm but pleasant conditions in San Bernardino in December. Focus on lightweight, maybe with natural fabrics, cotton blend shirts, comfortable shorts, and breathable footwear. A light cover-up for sun protection is smart too. It's going to pour! Pack a good poncho and prepare for very wet conditions. You'll definitely want to pack sunglasses and sunscreen. There will be plenty of bright sunshine this month.What To Do in San Bernardino in December
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Paraguay, check out our San Bernardino's climate page.
Temperature Rainfall Sunshine Humidity
See the full San Bernardino climate overview or explore weather in Paraguay.
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