Last updated: August 21, 2025
December in San Rafael, Argentina marks the onset of summer, featuring warm temperatures that peak at a sizzling 40°C (105°F). The average temperature hovers around a comfortable 24°C (76°F), while the nights can cool down to a refreshing 8°C (46°F). This month sees about 45 mm (1.8 in) of precipitation spread over 7 days, contributing to a relative humidity of 40%, which adds a slight warmth to the air. Whether you're exploring the wine country or basking in the sun, December is a vibrant time to experience the natural beauty of San Rafael.
In December, San Rafael, Argentina, ushers in the height of the summer season, with temperatures reflecting a warm and inviting climate. The month begins with a minimum temperature of 8°C (46°F), gradually rising to an average of 24°C (76°F), and hitting a scorching maximum of 40°C (105°F). This noticeable warmth is part of a steady increase observed throughout the spring and early summer months, transitioning from November's 22°C average to December's balmy 24°C. With the mercury peaking just shy of 41°C in January, December serves as a precursor to the summer's peak heat, making it an ideal time for outdoor activities and enjoying the vibrant natural beauty of the region. As the sun shines down, it invites both locals and visitors alike to soak in the warmth and lively atmosphere.
In December, San Rafael experiences a notable increase in precipitation, with an average of 45 mm (1.8 in) over 7 days. This trend marks a shift from the drier months of mid-year, as rainfall begins to pick up leading into the humid summer season. Interestingly, while November recorded the same amount of precipitation, it spanned over 8 days, suggesting that December may feature more intense bursts of rain. As the year closes, this uptick in rainfall contributes to a lush and vibrant landscape, setting the stage for the region's rich biodiversity.
In San Rafael, Argentina, December marks a notable shift in humidity, with levels dropping to a refreshing 40% after the more humid months of spring. This trend highlights a gradual decrease from the peak of 75% in May and 69% in April, setting the stage for the drier summer months ahead. The humidity levels maintain a downward trajectory as they transition from the lush, humid days of spring towards the more arid conditions typical of the southern hemisphere's summer. As December arrives, the pleasant drop in humidity offers a comfortable respite, making it an inviting time for outdoor activities and exploration in this picturesque region.
In December, San Rafael experiences an extreme UV Index of 15, mirroring the intense sunlight of the previous summer months. With a burn time of just 10 minutes, this month demands vigilance from sun-seekers. The trend throughout the year shows a consistent rise in UV levels during the peak summer months, with January and February also hitting extreme levels, while the tail end of the year witnesses a gradual decline. Notably, after the summer surge, the UV Index dips to 8 in April and 5 in May, signaling a more moderate sun exposure. As you plan outdoor activities in December, be sure to check the San Rafael UV Index for safety recommendations to protect your skin from the sun's potent rays.
UV Risk Categories
In San Rafael, Argentina, December shines brightly with an impressive 389 hours of sunlight, marking the peak of the city's sunny season. This burst of daylight is a delightful climax to a year characterized by increasing luminosity, starting from a modest 317 hours in January and steadily climbing, reaching its zenith in the last month of the year. The trend clearly shows that as summer approaches, so does the sun, providing a generous increase in light hours, which peaks from October onward. Following the sun's trajectory reveals the vibrant life and energy that December brings, inviting residents and visitors alike to bask in its warmth before the days begin to shorten again in January. This seasonal sunfest not only enhances the beauty of San Rafael but also fosters a lively atmosphere perfect for outdoor adventures and gatherings.
In San Rafael, Argentina, December sees a 62% chance of sunny weather, reflecting a slight dip as the year draws to a close. This decrease follows a trend of higher probabilities in the preceding months, particularly in July, which boasts an impressive 83% chance of sunshine. Overall, the warmer months from October to February generally enjoy solid sun exposure, with November at 72%, indicating that December still holds decent potential for bright, radiant days, even as the weather prepares for the transition into the cooler months. In the context of annual sunshine patterns, December remains a favorable month for those looking to soak up the sun before the arrival of winter.
In San Rafael, Argentina, the December daylight duration signals the peak of summer, with an invigorating 14 hours of sunlight illuminating the landscape. As the year unfolds, daylight gradually fluctuates, starting at a generous 14 hours in January before tapering down to 10 hours in May. This trend of diminishing daylight continues into the depths of winter, where it reaches its lowest at 9 hours in June. However, the cycle of light begins anew, as July and August see a slight increase back to 10 hours, eventually building back up to 11 hours in September and beyond. By the time December arrives, the days once again stretch luxuriously long, encapsulating the vibrant essence of summer in this picturesque locale.
In December, the winds in San Rafael, Argentina continue the trend of moderate breezes, with an average speed of 3.3 m/s (7 mph). This gentle wind picks up slightly from November’s consistent 3.6 m/s, reflecting a subtly shifting climate as summer approaches. Notably, the wind speeds show a gradual decline from the year’s peak in January, which recorded an average of 3.7 m/s (8 mph), before stabilizing in the later months of the year. As December unfolds, residents and visitors can enjoy pleasant outdoor conditions, where the refreshing winds complement the warm sunshine, making this time of year ideal for exploring the picturesque surroundings of San Rafael.
Weather in San Rafael varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in San Rafael, focusing on differences in temperature, rainfall, humidity, and UV levels.
When comparing the weather in December and January, both months experience warm temperatures, with January being slightly warmer on average. December has a minimum temperature of 8°C (46°F) and an average of 24°C (76°F), while January sees a minimum of 9°C (48°F) and an average of 26°C (79°F). The maximum temperatures are also similar, with December reaching up to 40°C (105°F) and January slightly higher at 41°C (106°F). Precipitation levels are lower in January, with 30 mm (1.2 in) over 6 days, compared to December's 45 mm (1.8 in) over 7 days. Humidity is a bit higher in January at 42%, compared to December's 40%. For more specifics on January weather conditions, check out San Rafael weather in January.
In December, the weather showcases a minimum temperature of 8°C (46°F) and peaks at 40°C (105°F), with an average of 24°C (76°F). This month experiences around 45 mm (1.8 in) of precipitation over approximately 7 days, accompanied by a relatively low humidity of 40%. Conversely, February sees a slightly warmer minimum temperature of 9°C (49°F) and maintains a similar average of 24°C (75°F), while the maximum temperature dips marginally to 40°C (104°F). Precipitation increases slightly to 52 mm (2.0 in) over just 6 days, and humidity rises to 46%. For detailed insights into the weather patterns in February, you can check San Rafael weather in February.
In comparing the weather between December and March, we observe notable differences in temperature, precipitation, and humidity. December experiences warmer conditions, with average temperatures reaching up to 24°C (76°F) and a maximum of 40°C (105°F), while March sees slightly cooler averages at 21°C (70°F) and a peak of 38°C (100°F). Precipitation levels are higher in December at 45 mm (1.8 in) with rain occurring on 7 days, compared to March’s 26 mm (1.0 in) and only 4 days of rain. Additionally, March has a higher humidity level at 58%, compared to December's 40%. For more detailed information about March weather, check out San Rafael weather in March.
In December, the weather in San Rafael is characterized by much warmer temperatures, with a minimum of 8°C (46°F) and an average high reaching up to 40°C (105°F). The humidity is relatively low at 40%, making the heat feel more intense despite 45 mm (1.8 in) of precipitation over about seven days. Conversely, April brings a notable drop in temperatures, with a minimum of 1°C (33°F) and a more moderate average high of 34°C (94°F). The humidity rises to 69%, and while total precipitation is slightly lower at 38 mm (1.5 in) over five days, the cooler weather creates a more comfortable atmosphere. For a closer look at April weather specifics, check out San Rafael weather in April.
In December, the weather tends to be quite warm, with average temperatures reaching around 24°C (76°F) and maximums peaking at 40°C (105°F). The month experiences relatively low humidity at 40%, with rainfall of about 45 mm (1.8 in) spread across approximately 7 days. In contrast, May presents a cooler climate, where average temperatures drop to 12°C (54°F), with minimums dipping to -1°C (30°F) and maximums reaching 32°C (90°F). Humidity significantly increases to 75%, but precipitation is lower at 39 mm (1.5 in) over about 4 days. For more details on the weather in May, you can visit San Rafael weather in May.
When comparing the weather in December and June, it's clear that they offer contrasting climates. December features much warmer temperatures, with a minimum of 8°C (46°F) and a scorching maximum of 40°C (105°F), alongside an average of 24°C (76°F). Although it does see some precipitation, with about 45 mm (1.8 in) over seven days, the humidity is relatively low at 40%.
In contrast, June presents a cooler scenario, where temperatures can drop to as low as -5°C (24°F), with a maximum reaching 25°C (77°F) and an average of only 8°C (47°F). This month also experiences significantly lower precipitation at just 16 mm (0.6 in), falling on about three days, but the humidity is much higher at 72%. For more detailed insights on June’s weather, visit San Rafael weather in June.
In December, the weather in San Rafael is significantly warmer than in July, with temperatures ranging from a minimum of 8°C (46°F) to a scorching maximum of 40°C (105°F) and an average of 24°C (76°F). Conversely, July brings much cooler weather, featuring temperatures that drop to a minimum of -3°C (26°F) and peak at 25°C (77°F), with an average of only 8°C (46°F). Additionally, December experiences more precipitation, averaging 45 mm (1.8 in) over about 7 days, compared to July's relatively dry climate with just 17 mm (0.7 in) of rain over 2 days. The humidity levels also contrast sharply, with December at 40% and July much higher at 73%. For more information on weather conditions in July, you can check this link: San Rafael weather in July.
December and August present strikingly different weather conditions. In December, temperatures reach a minimum of 8°C (46°F) and can soar to a maximum of 40°C (105°F), with an average around 24°C (76°F). The month experiences about 45 mm (1.8 in) of precipitation over 7 days, coupled with a humidity level of around 40%. In contrast, August brings significantly cooler temperatures, with a minimum of -3°C (26°F), an average of 11°C (52°F), and a maximum of 33°C (92°F). Additionally, August sees much less rainfall, approximately 10 mm (0.4 in) over just 2 days, though humidity levels are higher at 70%. For more detailed insights, you can check San Rafael weather in August.
When comparing the weather in December and September, there are stark contrasts. December boasts a higher average temperature of around 24°C (76°F), with maximums reaching up to 40°C (105°F), while September has a cooler average of 14°C (58°F), with maximums peaking at 33°C (91°F). Additionally, December sees more days of precipitation, with rain falling on approximately 7 days and a total of 45 mm (1.8 in), compared to September’s 21 mm (0.8 in) over just 4 days. Lastly, the humidity levels drop in December to about 40%, making it generally more comfortable than September's higher humidity of 59%. For more details, you can check San Rafael weather in September.
In comparing the weather patterns of December and October, December boasts significantly warmer temperatures, with average highs reaching 40°C (105°F), while October's average maximum is lower at 38°C (101°F). Despite this warmth, December experiences a more moderate minimum temperature of 8°C (46°F), compared to October's chilly low of 1°C (34°F). Precipitation is slightly higher in December, with 45 mm (1.8 in) over 7 days, while October sees 40 mm (1.6 in) across just 5 days but higher humidity levels at 57%. This makes October feel cooler and wetter than the drier and hotter conditions of December. For more detailed insights, you can check San Rafael weather in October.
In comparing the weather between November and December, December tends to be warmer and slightly drier. The average temperature in December reaches 24°C (76°F) with maximum highs of 40°C (105°F), compared to November's average of 22°C (71°F) and a maximum of 39°C (103°F). Despite December experiencing a bit less precipitation at 45 mm (1.8 in) over 7 days, November records slightly higher rainfall at 52 mm (2.1 in) over 8 days. Additionally, humidity levels are lower in December at 40%, while November sees a higher humidity of 44%. For more insights on November's climate, you can check San Rafael weather in November.
As December rolls in, San Rafael transforms into a vibrant tapestry of summer warmth, marking a notable shift from the cooler months. With temperatures peaking at a sweltering 40°C (105°F) and a pleasant average of 24°C (76°F), this month offers a delightful contrast to the chilly weather that precedes it. While precipitation remains light, averaging just 45 mm and spread across about 7 days, the 40% humidity provides a refreshing backdrop to outdoor adventures. This unique blend of heat and occasional rain makes December an ideal time to explore the region's stunning landscapes. For more insights into the seasonal weather patterns that define this enchanting destination, check out San Rafael Climate.