Last updated: January 18, 2025
San Martín, Peru, exhibits a diverse climate characterized by three Köppen-Geiger classifications: tropical rainforest (Af), tropical monsoon (Am), and savanna (Aw). The temperature profile reveals a minimum of 7°C (44°F) in August, escalating to an average of 23°C (73°F) throughout the year, with peaks reaching a scorching 37°C (99°F) in October. This climatic variability supports a rich biodiversity and influences the region's agricultural practices, making San Martín a fascinating study in tropical meteorology.
San Martín, Peru, exhibits a distinct temperature pattern throughout the year, characterized by mild variations that reflect its tropical climate. Starting in January, temperatures are warm with maximums around 36°C (97°F), gradually decreasing slightly as the year progresses to an average of 22°C (72°F) by June and July. The coldest months, notably August and July, see minimum temperatures dropping to 7°C (44°F) and average temperatures resting at around 22°C (71°F). As the dry season approaches in September through November, temperatures level off, maintaining averages of 23°C (74°F) and highs peaking at 37°C (99°F). This seasonal rhythm illustrates a transition from warm to cooler months, reflecting the region's tropical influences and seasonal shifts.
In August, Tarapoto experiences a warm range of temperatures, with a minimum of 14°C (58°F) and a maximum reaching 35°C (95°F) monthly temperatures in Tarapoto. Meanwhile, both Alto Mayo and Miraflores see cooler conditions, with minimums of 9°C (49°F) and 9°C (48°F) respectively. Alto Mayo has a maximum temperature of 28°C (83°F) in September, while Miraflores reaches up to 30°C (86°F) in the same month monthly temperatures in Alto Mayo and monthly temperatures in Miraflores.
San Martín, Peru, experiences a pronounced wet season from January to April, where monthly precipitation consistently exceeds 200 mm (7.9 in), peaking in March with an average of 303 mm (11.9 in) over 28 days of rainfall. This period is characterized by frequent rain events, contributing significantly to the region’s lush tropical landscape and supporting its diverse ecosystems. February and January follow closely, with 241 mm (9.5 in) and 214 mm (8.4 in) of rain, respectively, sustaining the high humidity levels typical of these summer months.
As the year transitions into the dry season from May to August, precipitation declines sharply, especially from June to August, when averages drop to 134 mm (5.3 in), 98 mm (3.8 in), and a mere 76 mm (3.0 in), respectively. This reduction in rainfall corresponds with fewer rainy days, dipping to 14 days in July and 11 days in August. Subsequently, precipitation begins to rise again in September, with 94 mm (3.7 in), and peaks anew in November at 249 mm (9.8 in), heralding the return of rain before the close of the year. Overall, the precipitation patterns in San Martín significantly influence agricultural practices and local livelihoods, demonstrating the interconnection between climate and environment.
San Martín, Peru, demonstrates a clear seasonal pattern in sunshine duration, with hours peaking during the dry season from May to August. May marks the transition into this sunniest period, with an impressive 302 hours of sunshine, followed by June and July, which boast 292 hours and 323 hours, respectively. August then takes the lead as the sunniest month with 324 hours of bright sunlight, providing ample opportunities for outdoor activities and agricultural productivity. This remarkable influx of sunshine correlates with the lower rainfall levels characteristic of these months, emphasizing a relationship between clear skies and seasonal weather variations.
As the year progresses into the wet season, a gradual decline in sunshine hours is observed. September still retains a substantial 308 hours, but the trend continues downward into October with 289 hours, and significantly lower during the following months of November and December, which witness 253 hours and 296 hours respectively. Despite this seasonal decrease, the overall sunshine duration throughout the year remains relatively high, making San Martín a favorable location for those who thrive on sunnier climates. These seasonal trends highlight the region's dynamic climate, where sunlight and rainfall dramatically shape local life and ecosystems.
San Martín, Peru, experiences persistently high UV Index levels throughout the year, indicating a significant risk of harm from unprotected sun exposure. The peak occurs from January to March, where the UV Index escalates to 18, categorized as extreme, necessitating a particularly cautious approach to sun exposure with a minimal burn time of just 10 minutes. This intense UV radiation underscores the importance of protective measures during the sunniest months, as individuals engaging in outdoor activities need to be vigilant about sunscreen application and UV protective clothing.
Although the UV Index dips slightly during the mid-year months of June and July to 12, it remains categorized as extreme, illustrating that protection is still critical during this period. As the year progresses into the late months, the UV Index stabilizes around 15 to 16, sustaining the extreme exposure category well into December. This consistent trend suggests that residents and visitors in San Martín should maintain a strong emphasis on sun safety year-round, highlighting the region's tropical characteristics and the implications for skin health and outdoor lifestyle choices.
UV Risk Categories
San Martín, Peru, enjoys a relatively consistent pattern of daylight duration throughout the year, with a majority of months experiencing approximately 12 hours of daylight. This equilibrium is particularly evident from January through March, where the balance of day and night remains stable, fostering an environment conducive to outdoor activities and agricultural pursuits. The consistency of daylight hours during these months exemplifies the region's proximity to the equator, contributing to an overall reliable solar exposure that benefits both residents and ecosystems.
As the year transitions into the cooler months of April through August, daylight duration slightly decreases to 11 hours. This minor reduction underscores the subtropical climate's seasonal shifts but does not substantially impact daily life due to the overall abundance of sunlight year-round. Interestingly, daylight returns to a 12-hour span in September through November, before closing the year in December with the same steady exposure. This cyclic pattern reinforces San Martín's climate, where reliable daylight enhances productivity and enriches the vibrant local environment.
Alto Mayo, Peru experiences a mild and humid climate, with average temperatures ranging from 18°C (64°F) to 19°C (66°F) throughout the year. The warmest months are typically from January to April, with maximum temperatures reaching up to 28°C (83°F). Precipitation peaks in March and is generally higher in the first half of the year, with January and March recording over 290 mm (11.4 in). Sunshine hours are abundant during the dry months of June to August, averaging around 300 hours, while rainfall is notably lower. For more details, visit Alto Mayo climate.
Miraflores, Peru, experiences a mild climate characterized by moderate temperatures and significant rainfall, particularly from January to April. Average monthly temperatures range from 18°C to 20°C (65°F to 68°F), while maximums can reach up to 30°C (86°F) in September and October. The region sees the highest precipitation between January and March, with January alone receiving 230 mm (9.1 in) of rain, tapering off to around 51 mm (2.0 in) in August. Despite the frequent rain during certain months, Miraflores enjoys ample sunshine, peaking in July and August with over 320 hours of sunlight. For more detailed climate information, visit Miraflores climate.
Tarapoto, Peru experiences a tropical climate characterized by warm temperatures and significant rainfall throughout the year. July is typically the coolest month, with average temperatures around 23°C (74°F), while August can peak at 35°C (95°F). The wettest months are March and April, with precipitation reaching 305 mm (12.0 in) and 259 mm (10.2 in) respectively. Despite its rainfall, the region enjoys ample sunshine, especially from May to August when sunshine hours exceed 300. For more detailed information, visit Tarapoto climate.
In conclusion, San Martín, Peru, presents a captivating climate characterized by its diverse temperature ranges, substantial precipitation, intense UV exposure, and consistent daylight duration. The region's warm temperatures, combined with a pronounced rainy season, foster a rich biodiversity and vibrant agricultural practices that are fundamental to local livelihoods. However, the high UV Index across the year compels both residents and visitors to prioritize sun safety. Meanwhile, the steady daylight hours enhance the appeal of outdoor activities throughout the seasons. Collectively, these climatic elements showcase the unique environmental dynamics of San Martín, making it a region of great ecological and cultural significance.