Last updated: August 21, 2025
December in Mendoza, Argentina offers a vibrant summer experience characterized by warm temperatures that can soar up to 40°C (104°F), with an average daytime high around 25°C (77°F). Nighttime brings a welcome cool down, dropping to a pleasant 11°C (52°F). Despite the warmth, this month sees relatively low precipitation, totaling just 26 mm (1.0 in) over roughly 5 days, resulting in a humidity level of 35%. This blend of heat and dry air creates an ideal atmosphere for enjoying the region’s renowned vineyards and breathtaking landscapes.
In Mendoza, Argentina, December heralds the onset of summer with temperatures rising significantly. The month begins with a comfortable minimum of 11°C (52°F) and boasts an impressive average of 25°C (77°F), making it an ideal time for outdoor activities. As the days progress, the heat intensifies, peaking at a sizzling 40°C (104°F). This trend towards warmer weather is consistent as the year transitions from the cooler months, showing a steady increase in daytime temperatures. With such a warm climate, December invites both locals and travelers to bask in the sun and explore the stunning landscapes and vineyards that the region is known for.
In December, Mendoza, Argentina experiences a modest shift in rainfall, with precipitation totaling 26 mm (1.0 in) across approximately 5 days. This marks a slight decline from the richer precipitation seen in February and March, which typically receive the most rainfall. Overall, December's precipitation aligns with the trend of drier months that characterize Mendoza's summer season, following the wetter late spring period of November. As the region transitions toward the hotter months, these lower precipitation levels suggest a familiar pattern where drier days outnumber the wet, reinforcing Mendoza's reputation as a semi-arid destination.
In December, Mendoza, Argentina, experiences a notable decline in humidity, reaching a comfortable 35%. This marks the lowest level of the year, following a gradual increase in moisture that begins in the late spring months. From January's 40%, the humidity steadily rises through the summer, peaking in May at 69% before a slow descent begins. As the year winds down, November retains some lingering humidity at 44%, but December brings a refreshing respite, making it an ideal time for outdoor activities and enjoying the region's stunning landscapes. The trend reflects Mendoza's characteristic shift from lush, humid summers to drier, more pleasant conditions as the year comes to a close.
December in Mendoza, Argentina, marks a peak in the UV Index, soaring to an extreme level of 15, similar to January and February. With a burn time of just 10 minutes, outdoor enthusiasts must be especially vigilant about sun protection during this month. As the calendar year progresses, the UV Index begins to decline, with lower readings noted from April onwards, transitioning from extreme to very high levels. Notably, the risk of sunburn remains significant until March, highlighting the need for year-round awareness and precautions. To explore detailed trends and insights on UV levels, visit Mendoza UV Index.
UV Risk Categories
December in Mendoza, Argentina, shines brightly with 397 hours of sunlight, marking it as one of the sunniest months of the year. This is a delightful crescendo in the annual progression of sunshine hours, reflecting a steady increase from the earlier months. Not only does December outshine the preceding months, but it also boasts a significant difference compared to the dimmer winter months of May and June. As the year winds down, the sun's presence in Mendoza becomes a symbol of warmth and vibrancy, inviting visitors to bask in the beautiful landscapes and lively vineyards that thrive under its generous glow.
As December approaches in Mendoza, Argentina, the likelihood of sunny weather remains fairly promising, with a 64% chance of sunshine. While this is slightly lower than the summer peak in July (87%), it still aligns well with the overall trend of sunny conditions seen earlier in the year. Compared to the preceding months, December marks a slight dip from November's 76%, yet it holds its own among the warmer months, with clear skies typically dominating the landscape. This pattern showcases Mendoza’s reputation for abundant sunshine, making it an attractive destination for those seeking vibrant summer vibes as the year closes.
In Mendoza, Argentina, December marks the peak of daylight duration, featuring an enchanting 14 hours of sunlight that beckons both locals and visitors to relish the outdoors. This seasonal high follows a consistent trend, as daylight gradually increases from the year's low of 9 hours in June, reaching its zenith in the summer months. As we transition from December through February, the daylight remains generous, providing 13 hours in February before starting its gentle decline. This rhythmic shift highlights Mendoza's stunning climate, where extended days invite exploration and enjoyment of the region's renowned vineyards and breathtaking landscapes.
As December embraces Mendoza, Argentina, the average wind speed settles at a gentle 2.8 m/s (6 mph), mirroring the slight uptick seen in the months leading up to it. This breezy close to the year showcases a consistency in wind patterns; while January kicks off the summer season with a similar speed, the winds tend to whisper softly through the following months, dipping to as low as 1.9 m/s (4 mph) in April. Interestingly, by September, the winds begin to pick up again, signaling a gradual ascent that culminates in December's refreshing airflow. This trend not only adds a delightful crispness to the warm summer days but also makes for a perfect backdrop against Mendoza's picturesque landscape, enhancing the overall sensory experience of this vibrant region.
Weather in Mendoza varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Mendoza, focusing on differences in temperature, rainfall, humidity, and UV levels.
December and January share similar high temperatures, both reaching up to 40°C (104°F), but January tends to be slightly cooler overall, with an average temperature of 26°C (80°F) compared to December's 25°C (77°F). While both months experience minimal precipitation, January sees a slight increase to 27 mm (1.0 in) over just 4 days, compared to December's 26 mm (1.0 in) across 5 days. Additionally, humidity rises in January to 40%, up from December's 35%, making January feel a bit more humid. For more detailed information, you can check out Mendoza weather in January.
In December, the weather is generally warm, with temperatures ranging from a minimum of 11°C (52°F) to a maximum of 40°C (104°F), while averaging at 25°C (77°F). This month sees relatively low precipitation, with just 26 mm (1.0 in) over 5 days and humidity at a comfortable 35%. In contrast, February experiences slightly cooler temperatures, with a minimum of 12°C (54°F) and a maximum of 39°C (103°F), resulting in an average of 24°C (76°F). However, February is wetter, receiving 44 mm (1.7 in) of rain over 7 days, and the humidity increases to 46%. For more detailed insights, you can check out Mendoza weather in February.
December and March offer distinct weather experiences, with December characterized by warmer temperatures and lower humidity. In December, the minimum temperature is around 11°C (52°F), with an average of 25°C (77°F) and a maximum soaring up to 40°C (104°F), alongside relatively low precipitation of 26 mm (1.0 in) over approximately 5 days. In contrast, March sees cooler temperatures with a minimum of 7°C (45°F) and an average of 22°C (71°F), while the maximum reaches 37°C (98°F). With increased humidity at 54% and slightly higher precipitation of 34 mm (1.3 in) over 6 days, March offers a different climate experience. For more details, check out Mendoza weather in March.
December and April exhibit distinctly different weather patterns. In December, temperatures can soar from a minimum of 11°C (52°F) to a scorching maximum of 40°C (104°F), with an average of 25°C (77°F). The humidity is relatively low at 35%, and precipitation measures 26 mm (1.0 in) over about five days. In contrast, April brings cooler temperatures, with a minimum of 3°C (38°F) and a maximum of 34°C (94°F), averaging 18°C (64°F). This month sees increased humidity at 65% and slightly higher rainfall, totaling 37 mm (1.5 in) across six days. For more detailed weather specifics, you can check Mendoza weather in April.
In December, the weather is characterized by warm temperatures, with a minimum of 11°C (52°F) and a scorching maximum of 40°C (104°F), averaging around 25°C (77°F). The humidity remains relatively low at 35%, and there is a light amount of precipitation totaling 26 mm (1.0 in) over about five days. In contrast, May experiences much cooler temperatures, with a minimum of 1°C (34°F) and a maximum of 26°C (80°F), averaging just 12°C (55°F). The humidity is significantly higher at 69%, and precipitation slightly increases to 31 mm (1.2 in), also spread over five days. For more details on the specific conditions during May, you can check out Mendoza weather in May.
When comparing the weather in December and June, the differences are striking. December features much warmer temperatures, with a minimum of 11°C (52°F) and an average high of 40°C (104°F), while June sees cooler conditions, with temperatures dropping to as low as -3°C (28°F) and averaging around 9°C (48°F). Additionally, December is relatively dry with 26 mm of precipitation over 5 days and a humidity level of 35%, whereas June experiences more moisture, with 15 mm of precipitation across just 3 days and higher humidity at 64%. For more insights into the weather during this cooler month, you can refer to Mendoza weather in June.
December and July showcase drastically different weather patterns. In December, temperatures soar with a minimum of 11°C (52°F), an average of 25°C (77°F), and a maximum reaching up to 40°C (104°F), accompanied by low humidity at 35%. Precipitation is relatively light at 26 mm (1.0 in), spread over 5 days. In contrast, July experiences much cooler temperatures, with a minimum of -2°C (29°F), an average of 8°C (47°F), and a maximum of only 23°C (74°F). This month also sees higher humidity at 65% and lower rainfall, accumulating just 10 mm (0.4 in) over 2 days. For more detailed information, you can check Mendoza weather in July.
Comparing the weather in December and August reveals substantial differences in temperature and humidity. December experiences significantly warmer temperatures, with a minimum of 11°C (52°F) and a peak reaching up to 40°C (104°F), while August's temperatures are much cooler, ranging from a low of -1°C (31°F) to a high of 31°C (89°F). Additionally, December has relatively low humidity at 35% compared to August's higher humidity level of 60%. Precipitation is also more frequent in December, occurring on about 5 days, while August sees only 2 days of light rain. For more details on August weather patterns, check out Mendoza weather in August.
The weather in December presents a striking contrast to that of September. With temperatures ranging from a minimum of 11°C (52°F) to a sweltering maximum of 40°C (104°F), December averages a warm 25°C (77°F) and experiences significantly lower humidity at 35%. In comparison, September boasts cooler temperatures, with a minimum of 0°C (32°F) and a maximum of 34°C (94°F), averaging 15°C (60°F). Additionally, September has higher humidity at 51% and receives only 14 mm (0.6 in) of precipitation over just 2 days, compared to December's 26 mm (1.0 in) spread over 5 days. For more specific insights, check out Mendoza weather in September.
In comparing the weather between December and October, December tends to be significantly warmer, with temperatures ranging from a minimum of 11°C (52°F) to a maximum of 40°C (104°F), while October sees a lower temperature range of 2°C (36°F) to 37°C (98°F). Both months receive the same amount of precipitation at 26 mm (1.0 in), but December experiences this over five days as opposed to just three in October. Additionally, humidity levels are lower in December at 35%, compared to a higher 49% in October, contributing to a drier feel during the hotter month. For a more detailed look at October's weather, you can visit Mendoza weather in October.
In comparing the weather between December and November, December tends to be slightly warmer, with average temperatures reaching 25°C (77°F) compared to November's 22°C (73°F). The maximum temperature in December can soar to 40°C (104°F), whereas November's peak is a bit lower at 38°C (101°F). While both months see about five days of precipitation, December experiences less rainfall overall, with 26 mm (1.0 in) compared to November's 31 mm (1.2 in). Additionally, December's humidity is notably lower at 35%, compared to November's 44%. For more details, you can check out Mendoza weather in November.
As December unfolds in Mendoza, the weather transitions into a warm and inviting atmosphere, distinctly setting it apart from the cooler months. With pleasant average temperatures around 25°C (77°F), the days feel lively, complemented by the sunny skies that dominate this time of year. Unlike the persistent rainfall experienced in spring, December sees limited precipitation, averaging only 26 mm across just a few days. This creates a dry environment, with humidity levels around 35%, making it an ideal month for outdoor activities and vineyard explorations. For a deeper understanding of Mendoza's varying climates throughout the year, check out Mendoza Climate.