Last updated: January 18, 2025
Hagatna, Guam, is characterized by a tropical rainforest climate (Köppen-Geiger classification: Af), marked by consistently warm temperatures throughout the year. The average temperature hovers around 27°C (82°F), with a minimum of 25°C (77°F) in March and a maximum peaking at 30°C (86°F) in September. This stable temperature range, combined with high humidity, creates an environment conducive to lush vegetation and diverse ecosystems, offering a unique glimpse into the dynamics of tropical climates.
In Hagatna, Guam, temperature patterns exhibit a consistent warmth throughout the year, reflecting its tropical climate. Monthly minimum temperatures remain stable, generally around 25-26°C (77-79°F), while average temperatures fluctuate modestly between 27°C (81°F) and 28°C (82°F), peaking at 29°C (84°F) during the warmer months from April to October. Maximum temperatures gradually increase, reaching their highest point of 30°C (86°F) in September. This subtle variation suggests a slight seasonal transition, with the warmest and most humid conditions typically occurring in the summer months, while the cooler months, namely January through March, maintain a delightful warmth that characterizes Guam's pleasant tropical environment.
In Hagatna, the climate features a consistent temperature range, with minimums around 25°C (77°F) in March and maximums peaking at 30°C (86°F) in September. This pattern is mirrored in Hagatna Village, where the temperatures align closely with those of Hagatna, maintaining a steady warmth throughout the year. For more details, you can explore the monthly temperatures in Hagatna here and in Hagatna Village here.
Hagatna, Guam experiences a highly distinctive precipitation pattern throughout the year, characterized by a pronounced wet season that peaks during the summer months. January through March typically receive moderate rainfall, with amounts ranging from 53 mm (2.1 in) in March to 77 mm (3.0 in) in February. As the year progresses, however, a significant increase in precipitation occurs, especially from June onward, peaking in August with a striking 405 mm (16.0 in) of rain. This pervasive wetness underscores the tropical climate of the region, where the daily rain can exceed 30 days in July and August, creating lush landscapes and abundant ecosystems.
The frequency of rainy days also reflects the seasonal variation, increasing from approximately 15 days in the first quarter of the year to 30 days during the peak of the wet season in July and August. Following this peak, precipitation remains high through September and October, albeit with slightly lower totals of 375 mm (14.8 in) and 356 mm (14.0 in), respectively. The wetter months contribute significantly to annual rainfall, leading to an overall average that emphasizes Hagatna's reputation as a lush tropical paradise, illustrating the intricate relationship between seasonal weather patterns and the local environment.
In Hagatna, Guam, sunshine duration showcases a notable seasonal trend, with a gradual increase in hours as the year progresses. Beginning with 232 hours in January, sunlight hours steadily ascend, peaking in May with an impressive 336 hours. This increase signals the transition into the dry season, where longer days allow for more sunshine, creating an inviting atmosphere for outdoor activities and tourism. The pattern continues into June with 319 hours, emphasizing the region's allure during the summer months where beachgoers and nature enthusiasts can bask in the abundant sunlight.
Conversely, the late summer months mark a slight decline in sunshine hours, falling to 269 hours in August and dwindling further to 259 hours in September, reflective of the increase in precipitation and cloud cover during the wet season. However, as the year wanes, sunshine hours begin to recover, stabilizing around 280-286 hours from November to December. This observations highlight the unique climate of Hagatna, where residents and visitors experience a blissful combination of tropical warmth and extended sunny days, contrasted by shorter hours during the rainier months, illustrating the dynamic interplay between sunlight and seasonal changes.
The UV Index in Hagatna, Guam, consistently reflects high levels of ultraviolet radiation throughout the year, classified as extreme across all months. Beginning with a UV Index of 11 in January and peaking at 15 in March and April, residents and visitors are advised to take protective measures against sun exposure, as the burn time remains a mere 10 minutes across the seasons. This persistent intensity underscores the importance of proper sun safety, including the use of sunscreen, protective clothing, and limited exposure during peak sunlight hours to prevent harmful effects.
As the months progress, the UV Index fluctuates slightly but remains predominantly elevated, ranging from 12 to 15 during the height of summer. This steady high exposure signifies that even during months that may seem less intense, such as November and December with indices of 11 and 12, vigilance is essential. The uniform nature of the UV Index throughout the year serves as a crucial reminder of Hagatna's tropical environment, emphasizing the importance of sun protection year-round to ensure health and safety in the intense sun.
UV Risk Categories
In Hagatna, Guam, daylight duration remains relatively stable throughout the year, offering residents and visitors consistent exposure to natural light. January and February each provide 11 hours of daylight, creating a sense of continuity as the new year begins. As March rolls in, the duration increases slightly to 12 hours, which is maintained through to September. This consistent span of daylight during the warmer months supports a vibrant outdoor lifestyle, fostering activities such as diving, hiking, and other sun-soaked adventures that the region is known for.
As the year transitions to October, daylight returns to 11 hours, and this pattern continues through November and December. This slight decrease signals a shift toward the end of the calendar year, yet the overall fluctuation remains minimal compared to many temperate regions. The reliable daylight hours in Hagatna not only reflect the tropical climate but also underscore the allure of its perpetual summer, where the sun consistently graces the landscape and enhances the island’s picturesque charm.
Hagatna, Guam enjoys a tropical climate characterized by warm temperatures year-round, with average monthly values typically ranging from 27°C (81°F) to 28°C (82°F). The wettest months are July and August, receiving significant rainfall of 276 mm (10.9 in) and 405 mm (16.0 in) respectively, while drier months like March and June have lower precipitation levels. Sunshine is abundant, with the sunniest months being May and June, recording around 336 hours of sunlight. This combination of warmth, humidity, and rain creates a lush environment typical of tropical regions. For more details, visit Hagatna climate.
Hagatna Village, Guam, experiences a tropical climate characterized by consistently warm temperatures, with averages ranging from 27°C (81°F) in January to 28°C (82°F) during most months, peaking at 30°C (86°F) in September. The wet season peaks from July to August, with July receiving about 276 mm (10.9 in) and August even more at 405 mm (16.0 in) of rainfall, while January sees the least at 61 mm (2.4 in). Sunshine hours are plentiful, with May boasting the highest at 336 hours, though the summer months experience slightly lower totals. For more detailed climate information, visit Hagatna Village climate.
In conclusion, Hagatna, Guam, exemplifies a captivating tropical climate characterized by stable temperatures, high humidity, and a pronounced wet season that fuels its lush ecosystems. The consistency in sunshine duration and elevated UV Index highlights the importance of sun safety, while the steady daylight hours throughout the year create ideal conditions for outdoor activities and exploration. Together, these climatic features not only define the unique environment of Hagatna but also enhance its appeal as a year-round destination for nature lovers and adventure seekers alike, inviting all to experience the beauty and vibrancy of this Pacific paradise.