December Weather in San Martin, Peru

Last updated: August 27, 2025

In December, San Martin, Peru, offers a warm tropical climate with a maximum temperature reaching up to 32°C (91°F) and an average of 24°C (75°F), making it a pleasant destination for visitors. The weather can turn a bit rainy, with a total precipitation amount of 29 mm (1.2 in) spread over approximately 7 days. Despite the occasional downpour, the region maintains a high humidity level of 86%, adding to the lush and vibrant local landscape. Perfect for those who enjoy a tropical ambiance, December in San Martin is ideal for exploring its stunning natural beauty while savoring the warmth.

December Temperature in San Martin

In December, San Martin, Peru, experiences a delightful transition into the warm summer months. With minimum temperatures hovering around 17°C (63°F) and averages reaching 24°C (75°F), the climate remains pleasantly inviting. Daytime highs can soar to a lively 32°C (91°F), providing ample opportunity for outdoor adventures. As the year wraps up, the region’s temperatures gradually climb from the cooler days of November, reflecting a trend of increasing warmth that characterizes the onset of summer in this vibrant locale. The mild nights and sunny afternoons make December a fantastic time to explore the area’s rich culture and stunning landscapes.

December Weather in San Martin: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in San Martin, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In San Martin, December typically has an average temperature of {2}°C ({3}°F), with highs reaching up to {4}°C ({5}°F) and lows dropping to around {6}°C ({7}°F).
JanFebMarAprMayJunJulAugSepOctNovDec788080787572696869707175
Data source: Temperature data for San Martin generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

December Precipitation in San Martin

In December, San Martin, Peru experiences a noticeable uptick in precipitation, with rainfall reaching 29 mm (1.2 in) over about 7 days. This marks a departure from the region's drier months, as the rainfall begins to build towards the wet season, peaking in March. While December's totals are higher than the preceding months, they are modest compared to the substantial 157 mm recorded in March. The rain provides a refreshing contrast to the previous months, particularly following the almost dry spells of August and September. As the year draws to a close, these showers not only bring relief from the dry conditions but also prepare the landscape for the vibrant growth that follows in the wetter months ahead.

December Precipitation Trends in San Martin

The chart displays monthly precipitation patterns in San Martin, with values for each month alongside December’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how December’s conditions compare to those of other months. In San Martin, December typically receives around {2} mm ({3} inches) of precipitation spread over approximately {4} days.
JanFebMarAprMayJunJulAugSepOctNovDec206515733136423101430
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in San Martin

In December, San Martin, Peru, experiences humidity levels around 86%, marking a slight increase compared to the drier months of July and August, when levels dipped to 71%. As the year draws to a close, the humidity begins to rise again after reaching its lowest in the middle of the year, bringing a more humid atmosphere in line with the wetter months of January and May. This trend reflects the region's characteristic seasonal shifts, revealing that even as the days cool, the air retains a significant moisture content, contributing to a lush and vibrant environment typical of the Amazonian region. Overall, December serves as a transitional month that reconnects the heat of summer with the cooler, authentic ambiance of the rainforest.

December Average Humidity in San Martin

This chart illustrates the average monthly humidity levels in San Martin, with December’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In December, average humidity in San Martin is approximately {2}%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec89%87%87%86%89%84%71%71%75%77%79%86%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in San Martin

In December, San Martin, Peru experiences a UV Index of 13, categorized as extreme, meaning that even a brief 10-minute exposure can result in skin damage. This month marks the decline from the peak UV levels seen earlier in the year, as the index had reached 16 in March. Notably, the UV ratings have consistently hovered between 11 to 16 from January through November, indicating a persistent need for sun protection during these months. As you plan your outdoor activities, be sure to stay informed about the local conditions and protect yourself accordingly. For more detailed information on UV exposure, visit San Martin UV Index.

Maximum UV Index Levels in San Martin for December

The chart shows the monthly maximum UV Index (UVI) for San Martin in December, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In December, the maximum UV index in San Martin typically reaches {2}, which falls under the {3} exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec141516151311111214141413
Data source: San Martin December UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

December Sunshine in San Martin

In December, San Martin, Peru, basks in an impressive 338 hours of sunshine, marking the peak of the year’s radiant glow. This final month showcases a delightful trend of increasing daylight, as it complements the gradual ascent from 271 hours in January to a summer high, enhancing the region's vibrant landscapes and inviting outdoor adventures. Each month builds on the last, with December finishing strong—highlighting a remarkable journey from the cooler early months toward a sun-drenched climax. This abundant sunlight not only invigorates the natural beauty of San Martin but also enriches its culture and tourism, making it a perfect time to explore the stunning scenery and warm hospitality that the region has to offer.

Monthly Sunshine Duration in San Martin: December Highlighted

The December sunshine duration represents the total number of hours San Martin experiences direct sunlight during the month of December, excluding cloudy or obstructed periods. This chart compares the sunshine duration of December with the other months of the year.
JanFebMarAprMayJunJulAugSepOctNovDec271h299h308h318h329h312h325h330h319h327h317h338h
Data source: San Martin December Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in San Martin During December

In December, San Martin, Peru sees a 28% chance of sunny weather, indicating a notable decrease as the year winds down. The trend reveals a gradual shift towards sunnier months, with May leading the way at 62%, followed by July at 60%. As the rainy season approaches, sunlight becomes less predictable, with December reflecting a dip from the preceding months, which typically hover around 30% in both October and November. The overall pattern showcases a contrast between the earlier months filled with glimpses of sun and the cloudier outlook at year's end, prompting visitors to be prepared for a mix of weather as they embrace the charm of the region during this transitional period.

Percentage of Sunny Days in December in San Martin

The chart illustrates the percentage of sunny days in San Martin throughout the year, with December highlighted. It highlights the variation in sunshine across each month and provides an overview of the typical frequency of sunny days, offering insights into how often San Martin experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec30%31%25%38%62%44%60%45%52%35%30%28%
Data source: San Martin December chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in San Martin in December

In San Martin, Peru, December marks the return of longer daylight hours, with 12 hours of sunlight illuminating the vibrant landscape. This pattern of consistent daylight stretches from January to March, creating a harmonious balance of light throughout the early months of the year. As the calendar transitions into spring, sunlight gradually decreases in April through August, offering 11 hours of daylight. However, by the time December rolls around, the daylight duration resets to a generous 12 hours, reminiscent of the earlier months, inviting residents and visitors alike to relish in the warmth and abundance of natural light. This rhythmic cycle highlights a unique climatic characteristic of the region, showcasing a predictable yet diverse interplay of daylight throughout the year.

Average Daylight Hours in San Martin for December

The chart illustrates the variation in daylight duration in San Martin throughout the year, with December highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec12h 22m12h 15m12h 6m11h 58m11h 51m11h 48m11h 50m11h 55m12h 3m12h 12m12h 20m12h 24m
Data source: San Martin daylight hours, calculated by summing the hours between sunrise and sunset for each day.

December Winds in San Martin

As December settles over San Martin, Peru, the winds gracefully mirror the rhythms of the year, maintaining an average speed of 3.5 m/s (8 mph). This stability in wind velocity marks a trend established in the latter half of the year, where consistent breezes have hovered around the same comfortable pace. With an uptick from January’s gentle 3.1 m/s, through a peak during the mid-year months, the winds have essentially found their sweet spot by December. This continuity not only enhances the tranquil beauty of the region but also provides a reliable backdrop for outdoor activities, inviting both locals and visitors to embrace the refreshing air alongside the mesmerizing landscapes.

Average December Wind Speed in San Martin

The chart displays monthly wind speed patterns in San Martin, with values for each month shown alongside December's data, which is highlighted for easy comparison. It illustrates the average wind speed, offering insights into how December's wind conditions compare to the rest of the year.
JanFebMarAprMayJunJulAugSepOctNovDec3.13.32.53.33.53.53.43.73.73.73.53.5 m/s
Data source: San Martin December wind data, generated using information from the Copernicus Climate Change Service.

How December Weather in San Martin Compares to Other Months

Weather in San Martin varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in San Martin, focusing on differences in temperature, rainfall, humidity, and UV levels.

In December, temperatures range from a minimum of 17°C (63°F) to a maximum of 32°C (91°F), with an average of 24°C (75°F). The month sees a total precipitation of 29 mm (1.2 in) over 7 days, accompanied by high humidity levels of 86%. In contrast, January experiences slightly warmer weather, with minimum temperatures of 19°C (67°F) and maximums reaching 35°C (94°F), averaging 26°C (78°F). Rainfall decreases to 20 mm (0.8 in) over just 4 days, while humidity rises modestly to 89%. For more detailed insights into January's climate, you can check San Martin weather in January.

In December, the weather features a mild range of temperatures, with a minimum of 17°C (63°F) and an average of 24°C (75°F), peaking at a comfortable 32°C (91°F). The month experiences relatively low precipitation, totaling 29 mm (1.2 in) over about 7 days, while humidity remains quite high at 86%.

In contrast, February sees slightly warmer temperatures overall, with a minimum of 20°C (68°F), an average of 27°C (80°F), and a maximum of 35°C (96°F). However, it also brings increased rainfall, with 65 mm (2.5 in) distributed over 9 days, and humidity remains comparable at 87%. For more detailed insights, you can check San Martin weather in February.

December and March present distinct weather patterns in the region. In December, temperatures range from a minimum of 17°C (63°F) to a maximum of 32°C (91°F), with an average of 24°C (75°F) and relatively low precipitation at 29 mm (1.2 in) over about 7 days. Humidity is high at 86%. In contrast, March sees warmer temperatures, with a minimum of 21°C (69°F) and a maximum of 36°C (96°F), averaging 27°C (80°F). Rainfall significantly increases to 157 mm (6.2 in) over 9 days, while humidity remains similar at 87%. For more detailed information, check out San Martin weather in March.

In comparing the weather between December and April, both months showcase warm temperatures, but April tends to be slightly hotter. December sees a minimum temperature of 17°C (63°F) and an average of 24°C (75°F), while in April, the minimum temperature rises to 18°C (65°F) and the average increases to 25°C (78°F). The maximum temperature in April can reach as high as 35°C (95°F), compared to December's maximum of 32°C (91°F). Precipitation levels are fairly close, with December experiencing 29 mm (1.2 in) over 7 days, and April seeing a slightly higher amount of 33 mm (1.3 in) over just 5 days, indicating a drier spell. Both months maintain consistent humidity levels at 86%. For more specific details, you can check San Martin weather in April.

When comparing the weather in December and May, both months exhibit similar average temperatures, with December seeing a minimum of 17°C (63°F) and a maximum of 32°C (91°F), while May has temperatures ranging from 16°C (62°F) to 33°C (91°F). December is characterized by slightly higher humidity at 86% compared to May’s 89%, and also experiences more rainfall, with 29 mm (1.2 in) over 7 days, as opposed to May's 13 mm (0.5 in) over just 4 days. Overall, while both months are warm, May tends to be a bit drier and slightly cooler at night. For a detailed look at May weather, you can check San Martin weather in May.

When comparing the weather in December and June, notable differences emerge. December boasts warmer temperatures, with a minimum of 17°C (63°F) and an average high of 32°C (91°F), while June has a slightly cooler average high of 31°C (88°F). Precipitation is also significant in December, totaling 29 mm (1.2 in) over 7 days, in contrast to June's much drier conditions, which see only 6 mm (0.2 in) over 2 days. Humidity levels remain relatively similar in both months, hovering around 86% in December and 84% in June. For a more detailed look at June's weather, you can check San Martin weather in June.

In comparing the weather between December and July, December typically experiences warmer temperatures, with a minimum of 17°C (63°F) and an average of 24°C (75°F), peaking at 32°C (91°F). This month sees higher humidity levels at 86% and greater precipitation, averaging 29 mm (1.2 in) over 7 days. In contrast, July is cooler, with temperatures ranging from a minimum of 15°C (60°F) to a maximum of 28°C (82°F), and a much lower average humidity of 71%. Precipitation in July is also minimal, with only 4 mm (0.1 in) falling over just 1 day. For more detailed information, check San Martin weather in July.

December and August present distinct weather patterns. In December, temperatures range from a minimum of 17°C (63°F) to a maximum of 32°C (91°F), resulting in a warm average of 24°C (75°F). This month is also characterized by higher humidity at 86% and more consistent rainfall, receiving 29 mm (1.2 inches) over about seven days. In contrast, August is cooler with temperatures ranging from 15°C (59°F) to 28°C (83°F), averaging 20°C (69°F). Precipitation is minimal during August, with only 2 mm (0.1 in) and no rainy days, and the humidity is lower at 71%. For more detailed information on August weather, check out San Martin weather in August.

In comparing the weather between December and September, December is generally warmer and more humid. The temperatures in December range from a minimum of 17°C (63°F) to a maximum of 32°C (91°F), with an average of 24°C (75°F). In contrast, September has cooler temperatures, with a minimum of 16°C (60°F), an average of 21°C (69°F), and a maximum of 29°C (85°F). Additionally, December experiences significantly more precipitation, averaging 29 mm (1.2 in) over 7 days, while September is notably dry, with only 3 mm (0.1 in) of rain across 0 days. This difference in humidity—86% in December compared to 75% in September—further adds to the contrast between these two months. For more detailed insights about September weather, you can visit San Martin weather in September.

In comparing the weather between December and October, December tends to be warmer, with average temperatures ranging from a minimum of 17°C (63°F) to a maximum of 32°C (91°F), while October's temperatures are slightly cooler, averaging from 16°C (61°F) to a maximum of 30°C (86°F). December also sees higher humidity levels at 86%, compared to October’s 77%. Furthermore, precipitation increases significantly in December with 29 mm (1.2 in) over 7 days, in contrast to October, which experiences only 10 mm (0.4 in) over just 2 days. For more detailed insights into October’s weather, you can visit San Martin weather in October.

In comparing the weather between December and November, December tends to be slightly warmer, with average temperatures ranging from a minimum of 17°C (63°F) to a maximum of 32°C (91°F), while November sees a lower range of 14°C (58°F) to 31°C (88°F). Humidity is higher in December at 86% compared to November's 79%, which can contribute to a more muggy feel. Additionally, December experiences more rainfall, with 29 mm (1.2 in) over 7 days, compared to November's 14 mm (0.6 in) over just 3 days. For a more detailed overview of the weather during this period, you can visit San Martin weather in November.

Compare San Martin's Climate with Cities Worldwide

Conclusion: What to Expect From December Weather in San Martin

As December rolls into San Martin, the weather begins to take on a warmer, more humid character that sets it apart from previous months. With daytime temperatures reaching their peak, the climate shifts to a cozy warmth that's perfect for enjoying the lush surroundings. However, the increased humidity—hovering around 86%—can make the air feel quite tropical, while occasional rain showers contribute to a total precipitation of 29 mm over about a week. This blend of warmth and moisture not only enhances the vibrant landscapes but also signals the start of a different seasonal charm. For a deeper dive into what to expect throughout the year, explore the comprehensive resource at San Martin Climate.