Last updated: June 24, 2025
In December, the average temperature in Pleasant Hill, United States hovers around 13°C (55°F), making it a mild yet variable time of year. Minimum temperatures can drop to -2°C (29°F) while maximums can soar to 28°C (83°F). Expect a fair amount of rain, with 117 mm (4.6 in) of precipitation spread over about 9 days, contributing to an average humidity of 88%. Prepare for cozy days and occasional showers!
In December in Pleasant Hill, the average temperature is 13°C (55°F), with maximums reaching up to 28°C (83°F) and minimums dropping to as low as -2°C (29°F). This range makes Pleasant Hill an ideal destination for travelers seeking a mix of mild and varied weather.
In Pleasant Hill in December, the total precipitation amount is 117 mm (4.6 in) spread over a period of 9 days.
In Pleasant Hill in December humidity is 88%. With an average temperature of 13°C (55°F), this humidity feels like a damp chill that clings to your skin, making it essential to dress in layers while exploring, as the moisture in the air can lead to a rather uncomfortable experience for traveling.
In Pleasant Hill in December, the maximum UV index reaches 4, which corresponds to a moderate Exposure Category. With a time to burn of 30 minutes, it’s important to take precautions to protect your skin. You can find more details in the Hourly UV Index in Pleasant Hill for better planning.
UV Risk Categories
Weather in Pleasant Hill varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Pleasant Hill, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 11°C (52°F) | 108 mm (4.3 inches) | 81% | moderate |
| February Weather | 13°C (55°F) | 124 mm (4.9 inches) | 81% | very high |
| March Weather | 18°C (64°F) | 102 mm (4.0 inches) | 79% | very high |
| April Weather | 20°C (67°F) | 139 mm (5.5 inches) | 80% | very high |
| May Weather | 24°C (76°F) | 166 mm (6.5 inches) | 81% | extreme |
| June Weather | 27°C (81°F) | 138 mm (5.4 inches) | 76% | extreme |
| July Weather | 28°C (84°F) | 98 mm (3.9 inches) | 73% | extreme |
| August Weather | 29°C (84°F) | 167 mm (6.6 inches) | 71% | extreme |
| September Weather | 26°C (80°F) | 158 mm (6.2 inches) | 72% | very high |
| October Weather | 21°C (70°F) | 113 mm (4.5 inches) | 73% | very high |
| November Weather | 15°C (60°F) | 72 mm (2.8 inches) | 83% | high |
| December Weather | 13°C (55°F) | 117 mm (4.6 inches) | 88% | moderate |