Last updated: June 24, 2025
In December, the average temperature in Carlsbad, United States hovers around 10°C (51°F). Expect a temperature range that can dip to a brisk -4°C (24°F) at its lowest and warm up to a pleasant 29°C (84°F) at its peak. With an average precipitation of 25 mm (1.0 in) spread over 4 days, and humidity levels reaching 85%, be prepared for a mix of chilly and comfortable weather conditions.
In December in Carlsbad, the average temperature is 10°C (51°F), with maximums reaching up to 29°C (84°F) and minimums dipping as low as -4°C (24°F). Be prepared for a wide range of temperatures, making it essential to pack layers for your trip.
In Carlsbad in December, the precipitation amount is 25 mm (1.0 in) over the course of 4 days.
In Carlsbad in December, humidity is 85%. With an average temperature of 10°C (51°F), this humidity feels like a damp chill enveloping you, making travel quite uncomfortable as your clothes cling to your skin and the air feels heavy, often leaving you longing for a dry, warmer environment.
In Carlsbad 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 Carlsbad for better planning.
UV Risk Categories
Weather in Carlsbad varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Carlsbad, focusing on differences in temperature, rainfall, humidity, and UV levels.
Temperature | Precipitation | Humidity | UV | |
---|---|---|---|---|
January Weather | 8°C (47°F) | 23 mm (0.9 inches) | 74% | moderate |
February Weather | 10°C (50°F) | 22 mm (0.9 inches) | 74% | high |
March Weather | 16°C (61°F) | 48 mm (1.9 inches) | 68% | very high |
April Weather | 19°C (67°F) | 51 mm (2.0 inches) | 70% | extreme |
May Weather | 24°C (75°F) | 101 mm (4.0 inches) | 77% | extreme |
June Weather | 27°C (82°F) | 47 mm (1.8 inches) | 76% | extreme |
July Weather | 29°C (85°F) | 21 mm (0.8 inches) | 66% | extreme |
August Weather | 29°C (84°F) | 34 mm (1.3 inches) | 60% | extreme |
September Weather | 25°C (78°F) | 73 mm (2.9 inches) | 67% | extreme |
October Weather | 19°C (67°F) | 51 mm (2.0 inches) | 72% | very high |
November Weather | 13°C (56°F) | 28 mm (1.1 inches) | 83% | high |
December Weather | 10°C (51°F) | 25 mm (1.0 inches) | 85% | moderate |