Last updated: August 27, 2025
Explore the vibrant December weather of San Francisco, Panama, where temperatures typically hover between a maximum of 32°C (90°F) and an average of 26°C (78°F), dipping to a comfortable minimum of 20°C (69°F). This month brings a touch of humidity, with levels reaching 79%, creating a warm and tropical atmosphere. Rainfall is a regular occurrence, with 103 mm (4.1 in) of precipitation spread over 9 days, adding a refreshing element to the lush surroundings. Whether basking in the sun or experiencing a light drizzle, December offers a delightful escape in this captivating destination.
In December, San Francisco and Panama both enjoy warm temperatures, but distinct patterns emerge as the month unfolds. With a minimum temperature of 20°C (69°F) and a comfortable average of 26°C (78°F), Panama offers a tropical feel. Meanwhile, San Francisco maintains a similar average of 26°C but tends to be cooler at night. Both cities peak at 32°C (90°F), showcasing their warm climates, yet the subtle night-time chill in San Francisco offers a different experience. December's steady temperatures indicate a consistent warmth across the board, inviting visitors to enjoy outdoor festivities in both vibrant locales.
In December, San Francisco, Panama experiences a notable increase in rainfall, measuring 103 mm (4.1 in) across 9 days. This uptick in precipitation is part of a larger pattern observed throughout the year, particularly from May to September, when the region sees its heaviest rainfall, peaking in September with 459 mm (18.1 in). The rainy season, characterized by almost daily showers from May to October, contrasts sharply with the drier months at the start of the year, where February and March notably receive no precipitation at all. As the year concludes, December's rainfall serves as a gentle reminder of the impending wet season, setting the stage for the wet and vibrant months ahead.
In December, San Francisco experiences a noticeable decline in humidity, dropping to 79% from the higher levels seen in the summer months. This marks a transition from the stifling humidity of June and July, when levels peak at a striking 90% and 88%, respectively. As the year progresses, the humidity gently tapers down, with a slight uptick in May at 73%, hinting at the arrival of the summer season. By December, however, the air feels significantly drier than the sweltering summer months, yet still retains a certain moisture that characterizes the city’s climate. Overall, while December’s humidity is lower than the oppressive highs of mid-year, it still reflects San Francisco's typical coastal environment, balancing a rich blend of seasonal changes.
In December, the UV Index in San Francisco, Panama registers at 11, maintaining its classification of extreme exposure, with a burn time still capped at just 10 minutes. This underscores a trend seen throughout the year, where months consistently showcase high UV levels, particularly from March to May, when the index peaks at 15. Even as the year winds down, December continues the pattern of elevated UV intensity, warning beachgoers and outdoor enthusiasts alike to remain vigilant against sun damage. For detailed insights into UV exposure throughout the year, visit San Francisco UV Index.
UV Risk Categories
December in San Francisco shines brightly with an impressive 301 hours of sunshine, marking a delightful end to the year. As we review the year, it's fascinating to see the trend of sunlight that characterizes the Bay Area: March takes the spotlight with a stunning 335 hours, while May and June tend to experience a dip, reflecting the typical foggy conditions. Despite the summer months of July and August being less sunny, recovery begins in September, leading to a resurgence of light in November. By December, the golden rays return, showcasing a festive farewell to the year. This pattern of fluctuating sunshine serves as a reminder of San Francisco's dynamic climate, with each month offering its own unique charm.
In December, San Francisco enjoys a 43% chance of sunny weather, marking a notable increase compared to the deeper winter months before it. This slight uptick indicates that while sunny days may be scarce during the latter part of the year, the golden hues of early winter provide a refreshing break from the grey skies typical of previous months. Notably, this chance of sunshine parallels December's performance with that of January, hinting at a trend where the city's weather begins to transition away from its dreary autumn, offering residents and visitors a glimmer of hope for brighter days ahead.
In San Francisco, Panama, December marks a transition into shorter daylight hours, with the sun shining for 11 hours—mirroring January and February. This trend of consistent daylight in the early winter months follows a pattern seen throughout the year, where daylight peaks at 12 hours from March to September. After September, the daylight gradually diminishes, creating a rhythm of light that echoes the changing seasons. As the year draws to a close, the return to 11-hour days provides a cozy atmosphere, perfect for enjoying the festive spirit of the season.
As December settles over San Francisco, a notable breeze picks up, with average wind speeds climbing to 1.7 m/s (4 mph). This slight increase comes after a string of calmer months, where winds dipped to their lowest in May, June, and July, averaging just 1.3 m/s (3 mph). The transition from the tranquil summer to the brisker winter months reveals a gentle escalation in winds, dancing cautiously from 1.2 m/s (3 mph) in September to the year’s end. While the peak winds are seen in March, reaching 3.3 m/s (7 mph), December's refreshing gusts hint at nature's shift, offering a breath of fresh air as the year draws to a close.
Weather in San Francisco varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in San Francisco, focusing on differences in temperature, rainfall, humidity, and UV levels.
In December, the weather is generally warm with temperatures ranging from a minimum of 20°C (69°F) to a maximum of 32°C (90°F). The month sees substantial rainfall, totaling 103 mm (4.1 in) and experienced over 9 days, contributing to a higher humidity level of 79%. In contrast, January offers slightly warmer conditions, with maximum temperatures reaching up to 33°C (91°F) while maintaining a consistent minimum of 20°C (68°F). Rainfall dramatically decreases to just 31 mm (1.2 in) over 4 days, resulting in lower humidity at 72%. Overall, January tends to be drier and slightly hotter than December. For more information, check out San Francisco weather in January.
In December, temperatures range from a minimum of 20°C (69°F) to a maximum of 32°C (90°F), with an average of 26°C (78°F). This month experiences considerable precipitation, totaling 103 mm (4.1 in) over about 9 days, contributing to a higher humidity level of 79%. In contrast, February sees slightly warmer temperatures, with a minimum of 20°C (68°F) and a maximum of 34°C (94°F), averaging 27°C (80°F). Notably, February is significantly drier, with only 8 mm (0.3 in) of precipitation and no rainy days, resulting in lower humidity at 71%. For more detailed weather information, visit San Francisco weather in February.
In December, temperatures range from a minimum of 20°C (69°F) to a maximum of 32°C (90°F), with an average of 26°C (78°F). The month experiences significant precipitation, totaling 103 mm (4.1 in) over about 9 rainy days, accompanied by high humidity levels at 79%. In contrast, March is slightly warmer, with temperatures beginning at 21°C (70°F) and peaking at 34°C (94°F), averaging 27°C (81°F). This month sees a drastic reduction in rainfall, with only 7 mm (0.3 in) and no rainy days, along with lower humidity at 69%. For more details on weather specifics, you can visit San Francisco weather in March.
When comparing the weather between December and April, December typically features a slightly cooler climate, with average temperatures ranging from a minimum of 20°C (69°F) to a maximum of 32°C (90°F). In contrast, April demonstrates a noticeable warming trend, with temperatures starting at a minimum of 21°C (70°F) and soaring up to 36°C (96°F). Both months experience similar precipitation levels, with December receiving 103 mm (4.1 in) over 9 days and April slightly higher at 105 mm (4.1 in) over 12 days. Additionally, December is characterized by higher humidity at 79%, while April enjoys a more comfortable humidity level of 70%. For a detailed look at weather patterns during this time, visit San Francisco weather in April.
In December, the weather features a warm average temperature of 26°C (78°F), with minimums of 20°C (69°F) and maximums reaching up to 32°C (90°F). This month experiences a relatively high precipitation level of 103 mm (4.1 in) over 9 days, coupled with a humidity of 79%. In contrast, May sees slightly higher minimum temperatures at 21°C (70°F) but has a significantly warmer maximum of 35°C (96°F). Precipitation also peaks in May at 355 mm (14.0 in), occurring across 27 days, resulting in lower humidity at 73%. Overall, while both months are warm, May is notably wetter and hotter compared to December. For more details, you can check San Francisco weather in May.
December and June present distinct weather patterns in San Francisco. In December, temperatures range from a minimum of 20°C (69°F) to a maximum of 32°C (90°F), with an average temperature of 26°C (78°F). The month sees about 103 mm (4.1 in) of precipitation over 9 days, accompanied by a humidity level of 79%. In contrast, June experiences slightly warmer temperatures, with a minimum of 21°C (70°F) and a maximum of 33°C (92°F), while maintaining the same average temperature of 26°C (78°F). However, June is notably wetter, with 353 mm (13.9 in) of rain spread over 28 days and a higher humidity level of 90%. For more specifics, you can explore San Francisco weather in June.
In December, temperatures are mild, with minimums around 20°C (69°F) and averages reaching 26°C (78°F), while maximums can go up to 32°C (90°F). The month experiences relatively moderate rainfall, with 103 mm (4.1 in) spread over about 9 days and humidity levels at 79%. In contrast, July sees a slight increase in maximum temperatures, peaking at 33°C (92°F), but comes with significantly higher precipitation, totaling 404 mm (15.9 in) over 28 days, along with increased humidity at 88%. This substantial difference in rainfall and humidity makes July feel considerably wetter compared to the drier December. For more details, visit San Francisco weather in July.
When comparing the weather in December and August, one can observe notable differences. December features slightly cooler temperatures, with a minimum of 20°C (69°F) and a maximum of 32°C (90°F), averaging at 26°C (78°F). The month also experiences considerable rainfall, totaling 103 mm (4.1 in) over approximately 9 days, accompanied by a humidity level of 79%. In contrast, August is warmer overall, with temperatures ranging from a minimum of 21°C (70°F) to a maximum of 33°C (91°F), averaging at 25°C (78°F). However, it is significantly wetter, receiving 359 mm (14.1 in) of precipitation over 29 days and having higher humidity at 87%. For more detailed insights about August weather, check out San Francisco weather in August.
In comparing December and September weather in San Francisco, it's clear that both months experience warm temperatures, with December showing a slightly lower average of 26°C (78°F) compared to September's 25°C (78°F). Interestingly, both months share similar maximum temperatures, reaching up to 32°C (90°F in December and 91°F in September). However, September is notably wetter, with a significant 459 mm (18.1 in) of precipitation over 30 days, compared to December's 103 mm (4.1 in) spread over just 9 days. Humidity levels are also higher in September at 87%, compared to December's 79%. For a more detailed look at September's weather, you can visit San Francisco weather in September.
In comparing the weather between December and October, December enjoys slightly higher average temperatures, with a minimum of 20°C (69°F) and a maximum of 32°C (90°F), while October has a minimum of 21°C (69°F) and the same maximum. However, October is notably wetter, with 410 mm (16.2 in) of precipitation over 29 days compared to December's 103 mm (4.1 in) over just 9 days. Additionally, humidity levels are higher in October at 86%, compared to December's 79%. For more detailed insights, you can refer to San Francisco weather in October.
December generally experiences slightly warmer temperatures compared to November, with average highs reaching 32°C (90°F) in both months. However, December's minimum temperature is a bit lower at 20°C (69°F), while November has a minimum of 21°C (70°F). Notably, December sees significantly less rainfall, totaling 103 mm (4.1 in) over 9 days, compared to November's 385 mm (15.1 in) over 26 days. Humidity also drops in December to 79%, in contrast to the higher 86% humidity experienced in November. For a deeper look into weather trends, you can check out San Francisco weather in November.
As December unfolds in San Francisco, the weather takes on a distinct character, marked by milder temperatures compared to the soaring highs of summer. With an average temperature hovering around a comfortable 26°C (78°F), the humidity rises to 79%, creating a cozy atmosphere despite an uptick in precipitation. Frequent rainy days—about nine this month—set December apart, offering a refreshing contrast to the drier months preceding it. This unique weather blend allows residents and visitors to enjoy a more relaxed pace, perfect for experiencing the city’s charm under a soft, drizzly sky. For a deeper understanding of what to expect, check out the details in San Francisco Climate.