Last updated: June 24, 2025
In December, the average temperature in Rancho Santa Margarita, United States hovers around 13°C (55°F), offering a comfortable climate for locals and visitors alike. You can expect temperatures to range from a chilly 1°C (34°F) at night to a pleasantly warm 28°C (83°F) during the day. However, do prepare for precipitation; with about 85 mm (3.3 in) of rainfall spread across 5 days, it's a good idea to carry an umbrella. Additionally, the average humidity sits at a moderate 71%, making it a delightful time to explore the area!
In December in Rancho Santa Margarita, the average temperature is 13°C (55°F). The maximum can reach 28°C (83°F), while the minimum can dip as low as 1°C (34°F). This varied climate makes Rancho Santa Margarita an ideal destination for travelers looking to experience a mix of warm and cool weather.
In Rancho Santa Margarita in December, the total precipitation amount reaches 85 mm (3.3 in) over the course of 5 days.
In Rancho Santa Margarita in December humidity is 71%. With an average temperature of 13°C (55°F), this humidity feels like a damp embrace, making travel a bit challenging as the moisture clings to your skin and the air feels thick, creating a sense of heaviness that can sap your energy while exploring.
In Rancho Santa Margarita 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 Rancho Santa Margarita for better planning.
UV Risk Categories
Weather in Rancho Santa Margarita varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Rancho Santa Margarita, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 13°C (55°F) | 84 mm (3.3 inches) | 74% | moderate |
| February Weather | 13°C (55°F) | 78 mm (3.1 inches) | 79% | high |
| March Weather | 14°C (58°F) | 94 mm (3.7 inches) | 75% | very high |
| April Weather | 17°C (63°F) | 36 mm (1.4 inches) | 70% | very high |
| May Weather | 18°C (65°F) | 21 mm (0.8 inches) | 70% | extreme |
| June Weather | 21°C (71°F) | 2 mm (0.1 inches) | 72% | extreme |
| July Weather | 25°C (77°F) | 2 mm (0.1 inches) | 73% | extreme |
| August Weather | 25°C (78°F) | 2 mm (0.1 inches) | 69% | very high |
| September Weather | 24°C (75°F) | 4 mm (0.2 inches) | 68% | very high |
| October Weather | 20°C (69°F) | 13 mm (0.5 inches) | 67% | high |
| November Weather | 17°C (62°F) | 34 mm (1.3 inches) | 68% | moderate |
| December Weather | 13°C (55°F) | 85 mm (3.3 inches) | 71% | moderate |