Last updated: April 22, 2025
Experience the vibrant December weather in San Diego, Mexico, where the festive season meets mild temperatures. With daytime highs reaching a warm 32°C (90°F) and comfortable averages around 21°C (71°F), it's perfect for enjoying outdoor activities. The nights cool down to a refreshing 10°C (51°F), providing a pleasant contrast. Expect some light rainfall, with an average precipitation of just 8 mm (0.3 in) over two days, while the humidity lingers at a mild 76%. This delightful climate makes December an ideal time to explore the beauty of San Diego, from its stunning beaches to vibrant cultural experiences.
In December, temperatures in San Diego, Mexico, exhibit a delightful shift as they transition into the cooler winter months. With nighttime lows averaging 10°C (51°F), visitors can expect a crisp but refreshing atmosphere ideal for evening strolls. The daytime warmth rises to a pleasant 21°C (71°F) on average, providing comfortable conditions to explore the scenic coastal views. As the month wraps up, highs can reach up to 32°C (90°F), allowing for those glorious sun-soaked afternoons typical of southern Baja California. This pattern highlights a gradual cooling from the balmy autumn, setting the stage for a mild yet enjoyable winter, where the charm of San Diego is beautifully showcased under the sun.
In December, San Diego, Mexico, continues the trend of relatively low precipitation characteristic of the winter months, recording just 8 mm (0.3 in) over 2 days. Following the bustling rainy season of summer and early autumn, which saw significant monthly totals—peaking at 183 mm (7.2 in) in June and 156 mm (6.2 in) in September—the arrival of December hints at a return to drier conditions. With only a handful of rainy days, this month underscores the transition into the cooler season, balancing the region's climate with a brief reprieve before the potential onset of more rain in the new year. Thus, December remains a manageable month for residents and visitors alike, who can enjoy the mild weather while still enjoying the lingering effects of the lush vegetation from the recent rains.
In December, San Diego, Mexico, experiences a humidity level of 76%, marking a slight decline from the 83% peak witnessed in October. This month reflects a returning trend reminiscent of January’s humidity but remains significantly high compared to the drier months of April (57%) and March (59%). Notably, the humidity levels are elevated during the summer months, with August and September both reaching 82%. As the year draws to a close, December’s humidity suggests a transition back towards comfort, while still maintaining a certain tropical feel that characterizes the coastal climate throughout the fall.
In December, San Diego experiences a UV Index of 9, maintaining a very high exposure category that requires outdoor enthusiasts to remain vigilant about sun protection. As the year closes, the UV levels decline slightly from the extreme ratings seen in the summer months, reflecting a general seasonal trend where the index often peaks at 15 during the hotter months from April to July. Notably, December's burn time is extended to 15 minutes, allowing for a bit more time in the sun compared to the 10 minutes advised in the peak months. However, the consistent trend of high UV Index values throughout the year emphasizes the importance of year-round sun safety. For more details, visit San Diego UV Index.
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As the year winds down, San Diego continues to bask in December's warm embrace with 316 hours of sunshine, showcasing the city’s enduring charm even in winter. This month contributes to a trend of generous daylight hours that peak in the summer, particularly in July with an impressive 329 hours. Interestingly, while the sun shines most brightly during the height of summer, December's sunlight still outshines the dark winter months, creating a balmy getaway for those seeking a slice of warmth amid the chill found elsewhere. Overall, the gradual tapering of sunlight from late summer to winter still maintains a noteworthy glow that makes San Diego an inviting destination year-round.
December in San Diego, Mexico, brings a delightful 71% chance of sunny weather, making it one of the more optimistic months for those seeking sunshine. As the year winds down, the likelihood of clear skies remains relatively high, especially compared to the summer months where the probability drops significantly. After a slight resurgence in November to 54%, December's sunniness stands out, revealing a trend where the region enjoys increasing sun exposure leading into the holiday season. This trend not only enhances the festive atmosphere but also provides an excellent opportunity for outdoor activities, making San Diego a favored destination in winter.
In San Diego, Mexico, December brings back the shorter days with approximately 11 hours of daylight, a continuation of the trend seen in both January and February. Following the longer daylight months of April through June, where the sun graces the skies for up to 13 hours, daylight begins to taper off. This shift marks a gradual return to a more consistent rhythm as spring and summer fade into winter, with daylight remaining stable at 11 hours through the end of the year. The patterns reveal a predictable ebb and flow, showcasing how seasonal changes gently influence the light-filled days in this coastal haven.
As December arrives in San Diego, Mexico, the average wind speed settles at a gentle 2.2 m/s (5 mph), maintaining a pleasant consistency similar to the months that preceded it. Following a rise to 2.4 m/s (5 mph) in November, December’s winds gently taper off, reflecting a trend of variability where spring months boast stronger breezes, peaking in March. The summer months of June and September exhibit notably lighter winds, dropping to lows of 1.2 m/s (3 mph), while December’s conditions bring a stable transition into winter. With these moderate winds, December offers an inviting atmosphere for outdoor activities, embodying the tranquil charm of San Diego's coastal climate.
The weather in San Diego changes throughout the year, offering a unique experience in each season. Below is a month-by-month comparison of December's weather with other months, highlighting differences in temperature, precipitation, and other key factors. Click on each section to discover seasonal trends in San Diego and find detailed weather information for every month.
In December, the temperatures in San Diego range from a minimum of 10°C (51°F) to a maximum of 32°C (90°F), with an average temperature of 21°C (71°F). The month experiences light precipitation, with only 8 mm (0.3 in) recorded over 2 days and maintains a humidity level of 76%.
January sees a slight increase in maximum temperature, reaching up to 33°C (93°F), while the minimum remains consistent at 10°C (50°F) and the average temperature dips slightly to 21°C (70°F). Precipitation decreases to just 1 day, with the same total of 8 mm (0.3 in) as December, and humidity remains steady at 76%. For more information, you can check San Diego weather in January.
In December, the weather features a comfortable temperature range with a minimum of 10°C (51°F), an average of 21°C (71°F), and a maximum of 32°C (90°F). Precipitation is relatively low at 8 mm (0.3 in) over two days, and humidity stands at 76%. In contrast, February sees a slight increase in average temperature to 22°C (72°F) while the maximum climbs to 35°C (96°F). Precipitation decreases further to just 5 mm (0.2 in) across one day, with humidity dropping to 68%. Overall, February tends to be warmer and drier compared to December. For more details, check San Diego weather in February.
In December, the weather is generally warm, with temperatures ranging from a minimum of 10°C (51°F) to a maximum of 32°C (90°F). The humidity is relatively high at 76%, and there is moderate precipitation of about 8 mm (0.3 in) over 2 days. In contrast, March experiences slightly warmer conditions, with a minimum temperature of 11°C (53°F) and a maximum of 36°C (96°F). The humidity drops to 59%, and precipitation is less frequent, averaging just 5 mm (0.2 in) over only 1 day. For a detailed look at March's climate, check out San Diego weather in March.
In December, the weather is generally warm, with temperatures ranging from a minimum of 10°C (51°F) to a maximum of 32°C (90°F), and an average of 21°C (71°F). The month sees minimal precipitation, with only 8 mm (0.3 in) over just 2 days, resulting in a relatively high humidity level of 76%. In contrast, April experiences even warmer conditions, with temperatures starting at a minimum of 14°C (57°F) and peaking at 37°C (99°F), averaging 25°C (78°F). Although April receives slightly more rainfall at 11 mm (0.4 in) over the same 2 days, the humidity drops to a more comfortable 57%. For more details about the weather, you can refer to San Diego weather in April.
In comparing the weather of December and May, it's evident that May tends to be warmer and wetter. December offers a more moderate climate with temperatures ranging from a minimum of 10°C (51°F) to a maximum of 32°C (90°F) and only 8 mm of precipitation over 2 days, resulting in a fairly humid atmosphere at 76%. In contrast, May heats up significantly, with temperatures ranging from a minimum of 17°C (62°F) to a scorching maximum of 37°C (99°F), accompanied by much higher precipitation totals of 88 mm (3.5 in) spread across 14 days, along with lower humidity levels at 65%. For a detailed look at May weather specifically, you can check San Diego weather in May.
December and June offer distinct weather experiences. In December, temperatures range from a mild 10°C (51°F) to a warm 32°C (90°F), with an average of 21°C (71°F). This month sees a low level of precipitation, with only 8 mm (0.3 in) falling over just 2 days, and humidity levels are relatively high at 76%. In contrast, June is noticeably warmer, with temperatures starting at a minimum of 17°C (63°F) and reaching a scorching maximum of 35°C (95°F), averaging 24°C (76°F). However, June is much wetter, receiving 183 mm (7.2 in) of rain over 20 days, and the humidity dips to 66%. For more details on the weather during this month, you can check San Diego weather in June.
December and July present contrasting weather patterns. In December, the temperatures typically range from a minimum of 10°C (51°F) to a maximum of 32°C (90°F), with an average of 21°C (71°F). This month sees relatively low precipitation of 8 mm (0.3 in) over just 2 days, while humidity sits at a comfortable 76%. In contrast, July experiences warmer temperatures with a minimum of 16°C (61°F) and a peak of 35°C (95°F), averaging 24°C (76°F). However, July is also wetter, receiving 42 mm (1.6 in) of rain over 6 days, with humidity slightly lower at 75%. For more detailed information, you can check San Diego weather in July.
In December, the weather is generally more pleasant, with average temperatures ranging from a mild 21°C (71°F) to a maximum of 32°C (90°F), accompanied by low precipitation at just 8 mm (0.3 in) over 2 days and humidity levels at 76%. In contrast, August experiences warmer conditions, with minimum temperatures starting at 16°C (61°F) and peaking at a scorching 36°C (97°F). Additionally, August is marked by significantly higher precipitation, totaling 91 mm (3.6 in) over 14 rainy days, and slightly increased humidity at 82%. For more specific details on the climate during this month, you can check San Diego weather in August.
In comparing the weather between December and September, December offers a more moderate temperature range, with minimums around 10°C (51°F) and maximums reaching up to 32°C (90°F). This month experiences relatively low precipitation of just 8 mm (0.3 in) over two days, contributing to a humidity level of 76%. In contrast, September tends to be warmer, with temperatures ranging from a minimum of 16°C (61°F) to a maximum of 33°C (92°F). However, it is significantly wetter, receiving approximately 156 mm (6.2 in) of rain over 19 days, resulting in higher humidity at 82%. For more detailed insights, you can check San Diego weather in September.
Comparing the weather in December and October reveals a noticeable shift in conditions. In December, temperatures range from a minimum of 10°C (51°F) to a maximum of 32°C (90°F), with a pleasant average of 21°C (71°F) and relatively low precipitation of only 8 mm over 2 days. In contrast, October experiences warmer temperatures, with a minimum of 16°C (61°F) and a maximum reaching up to 34°C (93°F), while averaging at 23°C (74°F). However, October also brings significant rainfall, totaling 134 mm over 15 days, and higher humidity at 83%. For a more detailed look at weather patterns during this month, check out San Diego weather in October.
In comparing the weather of December and November, December tends to be slightly warmer overall, with average temperatures ranging from a minimum of 10°C (51°F) to a maximum of 32°C (90°F), compared to November's temperatures of 13°C (55°F) minimum and 33°C (91°F) maximum. Humidity levels decrease slightly in December to 76%, while November experiences a higher humidity of 80%. Rainfall in December is significantly less, with only 8 mm (0.3 in) over 2 days, compared to November's 31 mm (1.2 in) across 5 days. For more detailed weather patterns, you can check San Diego weather in November.
As December rolls into San Diego, the weather brings a refreshing change characterized by mild temperatures that hover around a cozy average of 21°C (71°F). Unlike the sweltering heat of summer, this month offers a delightful respite, with maximum highs reaching 32°C (90°F) but also a chance to enjoy cooler evenings dipping to 10°C (51°F). With only two days of light precipitation, December typically sees far less rain than the wetter months, making it a popular time for outdoor activities. The humidity level, though relatively high at 76%, is still manageable, enhancing the comfortable coastal atmosphere. For those keen on exploring seasonal experiences, the month stands out for its unique climate. To learn more about how San Diego's weather patterns evolve throughout the year, check out San Diego Climate.