Last updated: August 21, 2025
December in Hagatna, Guam, presents a tropical escape, with maximum temperatures reaching around 29°C (84°F) and averaging a comfortable 27°C (82°F). The month experiences a minimum temperature of 26°C (78°F), creating a warm and inviting atmosphere. However, travelers should prepare for frequent showers, as precipitation totals about 105 mm (4.1 in) over approximately 22 days, contributing to the region's characteristic humidity level of 84%. This blend of warmth and rain highlights Guam's lush landscapes, making December an intriguing blend of tropical beauty and vibrant culture.
In Hagatna, Guam, December marks a delightful transition as temperatures remain pleasantly warm, with minima around 26°C (78°F) and averages peaking at 27°C (82°F). The highs can climb to about 29°C (84°F), resembling the tropical warmth characteristic of the region throughout the year. Notably, December's temperatures maintain a steady rhythm similar to earlier months, showcasing a consistent mildness that makes it perfect for holiday festivities. This enduring warmth, combined with slightly cooler evenings, offers a serene ambiance for visitors and locals alike, making December an inviting time to explore the island's natural beauty and vibrant culture.
In December, Hagatna, Guam experiences a noticeable shift in precipitation patterns, with rainfall amounting to 105 mm (4.1 in) over 22 days. This marks a decrease from the peak rainfall seen in the summer months, particularly July and August, which often bring intense downpours. As the year draws to a close, the rainfall in December reflects a transition towards the drier season, yet still maintains a substantial contribution to the overall annual precipitation. The frequency of rainy days shows a slight reduction compared to the heavier months, offering a respite while still ensuring the lush, tropical environment that characterizes Guam. Overall, December serves as a bridge between the heavy rains of late summer and the cooler, drier months that follow.
In Hagatna, Guam, December ushers in a peak in humidity levels, reaching 84%. This month marks a notable rise from the more stable 80% to 81% range observed during the summer months. As the year progresses from January's 83% through November's slight dip to 81%, the rise in December reflects a trend of increasing moisture as the climate shifts toward winter. This consistent humidity, coupled with the tropical atmosphere, creates a rich, lush environment, characteristic of Guam’s captivating landscape during the holiday season.
As December rolls in, Hagatna, Guam maintains its reputation for high UV exposure, with the UV Index settling at 11, classified as extreme. This figure aligns with a consistent trend observed throughout the year, where the UV Index remains persistently high, peaking at 15 during March and April. Interestingly, despite a slight dip in December, the burn time stays constant at just 10 minutes, underscoring the need for diligent sun protection throughout the month. With weeks of intense UV exposure behind us and the new year approaching, it's crucial for residents and visitors alike to remain vigilant about sun safety. For more insights on UV levels, check out the comprehensive data at Hagatna UV Index.
UV Risk Categories
In Hagatna, Guam, December offers a delightful 286 hours of sunshine, contributing to the island's overall inviting climate as the year draws to a close. This month marks a slight decline from the sunniest peak in May, where residents and visitors basked in an impressive 336 hours of golden rays. Following the vibrant summer, the sunshine hours begin to taper off slightly through the autumn months, showcasing a steady trend of shorter days as winter approaches. However, December still presents ample sunlight, surpassing the hours of earlier months like January and February, ensuring that festive celebrations are illuminated by the warm glow of the Pacific sun. As individuals revel in the season's festivities, the consistent sunshine of December creates a serene backdrop, embodying the tropical charm of this beautiful island paradise.
In Hagatna, Guam, the likelihood of sunny weather in December stands at 35%, reflecting a moderate chance amid the island's seasonal fluctuations. Observing the yearly trend, we see a significant peak in sunshine from March (63%) and a steady decline through the hotter months of April and May, where sunny days dip below 40%. The rainy season takes a notable toll during the summer, particularly in August with just 5% sunshine, while November surprisingly rebounds to match January's 50%. As the year closes, December's chance of sunshine suggests a mix of varying weather patterns but remains noticeably less than the sun-soaked highs of early spring.
In Hagatna, Guam, December brings a return to 11 hours of daylight, echoing the pattern set in January and February. This seasonal rhythm highlights a gradual shift throughout the year: daylight peaks at a consistent 12 hours from March to August, providing lush and vibrant days, before tapering back in the later months. The consistent 11 hours in December signifies a cozy conclusion to the year, inviting residents and visitors to enjoy the island's warm evenings as they wind down from the sun-soaked summer days. The slight decrease in daylight towards the end of the year reinforces the tropical climate's subtle variations, making each month a unique experience in this island paradise.
In Hagatna, Guam, the wind takes a notable turn as December arrives, with average gusts reaching 8.0 m/s (18 mph)—a refreshing breeze that ties with January for the highest speed of the year. This uptick in wind velocity reflects a seasonal shift, as the winds generally wane from the spring months, hitting their lowest in June at 4.7 m/s (10 mph). Throughout the latter part of the year, November brings a resurgence to 7.2 m/s (16 mph) before December's brisk air sets the stage for winter. As the island transitions toward the new year, the consistent wind speeds in these closing months remind us of the dynamic climatic patterns at play in this tropical paradise.
Weather in Hagatna varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Hagatna, focusing on differences in temperature, rainfall, humidity, and UV levels.
In December, the weather tends to be slightly warmer with average temperatures ranging from a minimum of 26°C (78°F) to a maximum of 29°C (84°F). This month experiences higher rainfall, totaling 105 mm (4.1 in) over about 22 days, contributing to a humidity level of 84%. In contrast, January sees a slight dip in temperatures, with a minimum of 25°C (77°F) and a maximum of 28°C (83°F), while experiencing significantly less precipitation of 61 mm (2.4 in) across 15 days. The humidity remains comparable at 83%. For more detailed information, you can check Hagatna weather in January.
December and February share similar warm temperatures, with December recording a minimum of 26°C (78°F) and an average of 27°C (82°F), while February slightly cools to a minimum of 25°C (78°F) and maintains the same average of 27°C (80°F). However, December experiences more rainfall, totaling 105 mm (4.1 in) over 22 days, compared to February's 77 mm (3.0 in) over just 15 days, indicating that February is drier. Additionally, humidity levels are slightly lower in February at 82% compared to December’s 84%. For more detailed insights, visit Hagatna weather in February.
In December, the weather is characterized by slightly warmer temperatures, with a minimum of 26°C (78°F) and a maximum of 29°C (84°F). Precipitation is also higher during this month, averaging 105 mm (4.1 in) over 22 days, contributing to the notably humid conditions with humidity levels at 84%.
In contrast, March offers a marginally cooler climate, with temperatures ranging from a minimum of 25°C (77°F) to a maximum of 28°C (83°F). Rainfall decreases significantly to 53 mm (2.1 in) over 15 days, while humidity remains constant at 84%.
For a more detailed look at March weather, visit Hagatna weather in March.
In December, the weather features a minimum temperature of 26°C (78°F) and averages around 27°C (82°F), peaking at 29°C (84°F). This month experiences higher precipitation with about 105 mm (4.1 in) spread over 22 days, while humidity remains constant at 84%. In contrast, April sees slightly warmer minimum temperatures of 25°C (77°F) and similar average and maximum temperatures, but with reduced rainfall of 94 mm (3.7 in) over 18 days, maintaining the same humidity level of 84%. Overall, while both months are quite similar in temperature, December tends to be wetter with more days of rain. For more details on the April weather, visit Hagatna weather in April.
In comparing the weather of December and May, both months exhibit similar temperature ranges, with December showing a minimum of 26°C (78°F) and an average of 27°C (82°F) compared to May's minimum of 25°C (78°F) and average of 28°C (82°F). However, December experiences more precipitation, accumulating 105 mm (4.1 in) over 22 days, while May has a lower total of 78 mm (3.1 in), also over 22 days. The humidity levels are slightly higher in December at 84%, compared to May's 83%. This makes December feel a bit more humid, despite both months feeling generally warm and tropical. For a closer look at the weather in May, you can check out Hagatna weather in May.
In December, the weather remains warm with average temperatures hovering around 27°C (82°F) and a maximum of 29°C (84°F). The month sees a significant amount of rainfall, accumulating to 105 mm (4.1 in) over 22 days, and high humidity levels at 84%. In contrast, June experiences similar average temperatures, with a minimum of 25°C (78°F) and a maximum of 29°C (85°F). However, June is wetter, with total precipitation reaching 159 mm (6.3 in) over 23 days, while the humidity is slightly lower at 80%. For a detailed look at the specific weather conditions in June, you can check out Hagatna weather in June.
In December, the weather in Hagatna features consistently warm temperatures, with a minimum of 26°C (78°F), an average of 27°C (82°F), and a maximum reaching 29°C (84°F). While the humidity remains high at 84%, December experiences a total precipitation of 105 mm (4.1 in) over 22 days. In contrast, July has similarly warm temperatures, with a minimum of 26°C (78°F), an average of 28°C (82°F), and a maximum of 29°C (85°F). However, it sees a significant increase in rainfall, totaling 276 mm (10.9 in) spread across 30 days, along with slightly lower humidity levels at 80%. For a more detailed look at July weather patterns, visit Hagatna weather in July.
When comparing the weather in December and August, there are some notable differences. In December, the temperatures are slightly cooler, with averages around 27°C (82°F) and a maximum of 29°C (84°F), while August sees a similar max temperature of 29°C (85°F) but with a slightly higher average of 28°C (82°F). Precipitation levels also vary significantly, with December receiving 105 mm (4.1 in) of rainfall over 22 days, whereas August experiences much heavier rainfall, totaling 405 mm (16.0 in) across 30 days. Humidity is relatively high in both months but is marginally lower in August at 80% compared to December’s 84%. For more detailed insights, check out Hagatna weather in August.
December and September exhibit distinct weather patterns. In December, the temperatures range from a minimum of 26°C (78°F) to a maximum of 29°C (84°F), with an average of 27°C (82°F). Precipitation is substantial but lower than in September, totaling 105 mm (4.1 in) over 22 days, accompanied by high humidity at 84%. Conversely, September showcases slightly warmer temperatures, with a minimum of 25°C (77°F) and a maximum of 30°C (86°F), averaging 28°C (82°F). However, it is notable for its much higher precipitation of 375 mm (14.8 in) over 28 days. Despite its slightly lower humidity of 81%, September remains notably wetter than December. For a more detailed look at September weather, check out Hagatna weather in September.
When comparing the weather in December to that in October, we see some notable differences. December typically experiences slightly cooler temperatures, with an average of 27°C (82°F) compared to October's 28°C (82°F), although both months have maximum temperatures that reach up to 29°C (84°F and 85°F respectively). Rainfall is significantly higher in October, with 356 mm (14.0 in) of precipitation over 29 days, compared to December's 105 mm (4.1 in) over 22 days. Humidity levels remain relatively high in both months, with December at 84% and October at 80%. For a detailed look at October weather, you can visit Hagatna weather in October.
In December, the weather shows only a slight decrease in average temperature compared to November, with averages of 27°C (82°F) in December versus 28°C (82°F) in November. Both months experience similar maximum temperatures, but December has a lower minimum of 26°C (78°F) compared to November's minimum of 26°C (79°F). Notably, December sees a significant drop in precipitation, with 105 mm (4.1 in) occurring over 22 days, while November is considerably wetter, with 202 mm (8.0 in) over 26 days. Humidity levels are slightly higher in December at 84%, compared to 81% in November. For more insights on November's weather in Hagatna, check out Hagatna weather in November.
As December rolls into Hagatna, the weather transforms into a warm yet humid embrace, with temperatures consistently hovering around the mid-25s°C. This month is characterized by increased precipitation, with rain gracing the city on more than two-thirds of the days, creating a lush, vibrant landscape. The humidity peaks at 84%, making the air feel particularly tropical and inviting. Unlike the dryer months, December offers a picturesque blend of warmth and moisture that gives Hagatna its distinct tropical charm, perfect for adventurers seeking to experience the island's natural wonders. For a deeper dive into Hagatna's weather trends throughout the year, explore Hagatna Climate.