Last updated: January 18, 2025
The climate of Arusha, Tanzania, is predominantly classified under the Köppen-Geiger system as Aw (tropical savanna) and Cwb (temperate highland). This region experiences a significant temperature range, with minimum temperatures plunging to 7°C (44°F) during August and peaking at a warm 35°C (96°F) in March. The average annual temperature hovers around 19°C (67°F), illustrating the diverse climatic conditions that characterize this enchanting area. Such variability in temperature contributes to Arusha’s unique ecosystems and agricultural practices, making it a fascinating subject for climate study.
Arusha, Tanzania, exhibits distinct temperature patterns throughout the year, marked by a warm tropical climate with notable seasonal variations. From January to March, the region experiences its hottest period, with maximum temperatures regularly reaching 34°C (93°F) to 35°C (95°F), while average temperatures remain consistently around 21°C (70°F). As the seasons shift into April and May, a slight cooling occurs, with average temperatures dropping to 19°C (66°F) and maximums tapering off to 31°C (87°F). June through August marks the coldest phase, characterized by minimum temperatures dipping to 7°C (44°F) and average temperatures hovering around 17°C (63°F). As spring approaches in September and October, temperatures begin to rise again, returning to averages of 19°C (66°F) to 20°C (68°F), while maximums remain comfortably summery. The year wraps up in November and December with a return to the warmer averages seen at the beginning of the year, creating a dynamic climate that enhances Arusha’s rich biodiversity and agricultural potential.
In Mto wa Mbu, temperatures range from a minimum of 7°C (44°F) in August to a maximum of 28°C (83°F) in March, while nearby Arusha experiences slightly warmer conditions with a minimum of 7°C (45°F) in August and a peak of 31°C (87°F) in March. The climate in Ngorongoro is a bit cooler, with temperatures dropping to 8°C (46°F) in August and rising to a maximum of 28°C (82°F) in October. For more detailed information, you can explore the monthly temperatures in Mto wa Mbu, Arusha, and Ngorongoro.
Arusha, Tanzania, experiences a pronounced rainy season, predominantly from January through April. January begins the year with 181 mm (7.1 in) of rainfall distributed over 12 days, gradually increasing to a peak in March with 244 mm (9.6 in) over 17 days, and then slightly subsiding in April at 215 mm (8.5 in) across 25 days. This period of heavy precipitation is essential for supporting the region’s lush landscapes and biodiversity. In contrast, May sees a significant drop to 96 mm (3.8 in), marking the transition to a drier season as the long rains begin to wane.
From June to September, Arusha experiences a marked reduction in rainfall, with monthly totals averaging only 14 mm to 15 mm (0.6 in) and typically occurring over just 3 to 4 days. This dry spell culminates in September, with minimal precipitation of 12 mm (0.5 in). October heralds the approach of the short rainy season, with precipitation increasing again to 60 mm (2.4 in) over 11 days. November and December see a resurgence in rainfall, with 134 mm (5.3 in) and 191 mm (7.5 in), respectively, ensuring that the region remains vibrant and replenished as it transitions back into the wetter months.
Arusha, Tanzania, enjoys a significant amount of sunshine throughout the year, with the most hours of sunshine typically occurring during the transition from summer to autumn. From January to March, sunshine hours peak impressively, with March leading the way at 337 hours. Following this peak, April remains relatively high at 316 hours, but sunshine hours begin to stabilize slightly. The remaining months of the dry season, from May through August, maintain considerable sunshine, ranging between 324 hours and 339 hours. This consistency highlights Arusha's favorable conditions for outdoor activities and agriculture during the latter part of the rainy season and early dry season.
As the year progresses into October, sunshine reaches a remarkable 353 hours, solidifying it as one of the sunniest months. November and December follow closely with 341 hours and 349 hours respectively, suggesting that even in the months marking the beginning of the short rainy season, clear skies often dominate. Notably, the gradual rise in sunshine hours from winter through summer, alongside bursts of abundant daylight, indicates a climate that supports both vibrant ecosystems and a flourishing agricultural sector. Overall, Arusha’s sunshine patterns reflect a dynamic interplay of seasonal changes that provide ample opportunity for both residents and visitors to enjoy its stunning landscapes.
Arusha, Tanzania, experiences consistently high UV Index levels throughout the year, indicating a need for diligent sun protection. From January to April, the UV Index remains extremely high, peaking at 17 in March, with values of 16 in both January and February, and continuing at 16 in April. During these months, the exposure category is classified as extreme, which necessitates careful measures as the recommended burn time is a mere 10 minutes. This intensity calls attention to the importance of protective clothing, sunscreen, and limited direct sun exposure during peak hours.
As the year progresses into the drier months, the UV Index begins to slightly decrease but remains in the extreme exposure category. From May through October, the index ranges between 12 and 14, with burn times consistently remaining limited to 10 minutes. Despite these slightly lower values, the UV radiation remains significant and requires ongoing protective steps. This persistent elevated UV Index throughout the year highlights Arusha's geographic position and elevational influence, emphasizing the necessity for both residents and tourists to prioritize sun safety measures while enjoying the outdoors.
UV Risk Categories
Arusha, Tanzania, enjoys a remarkably consistent daylight duration throughout the year, with most months featuring around 12 hours of daylight. From January to April, the length of the day remains stable, providing ample sunlight for both daily activities and natural ecosystems. This predictability facilitates a rhythm of life that is deeply intertwined with the sun's cycle, allowing for optimal conditions for agriculture and outdoor pursuits. The month of May sees a slight reduction to 11 hours, and this trend continues through June, July, and August, marking the winter months in the Southern Hemisphere.
As the year advances into September, daylight duration returns to 12 hours, and this pattern continues through to December, creating a balance of light and darkness that characterizes the region. The relatively uniform length of daylight throughout the year contributes to Arusha’s favorable climate, supporting vibrant biodiversity and allowing communities to engage in various activities without the dramatic fluctuations seen in more temperate zones. This stability in daylight hours enhances both the agricultural productivity and the general quality of life in this breathtaking region.
Arusha, Tanzania, boasts a temperate climate characterized by mild temperatures throughout the year, with averages ranging from 16°C (60°F) in July to 21°C (70°F) in March. The dry season occurs from June to September, with minimal rainfall—less than 15 mm (0.6 in) each month—while March and April experience the highest precipitation, reaching 201 mm (7.9 in) and 174 mm (6.9 in), respectively. Sunshine is abundant, peaking in October with 350 hours, promoting a warm and inviting atmosphere. For more detailed information, visit Arusha climate.
Merelani, Tanzania experiences a warm climate with average temperatures ranging from 19°C (67°F) in July to 25°C (77°F) in the first half of the year. Rainfall is highest from March to April, peaking at 198 mm (7.8 in) in April, while June to September sees notably lower precipitation. The region enjoys abundant sunshine, particularly in October with 351 hours, providing nearly year-round bright days. This combination of warmth and sunshine makes Merelani an attractive location, with visitors often seeking to explore its vibrant landscapes. For more details on the climate in Merelani, see Merelani climate.
Mto wa Mbu, Tanzania experiences a tropical climate characterized by warm temperatures and distinct wet and dry seasons. Average temperatures range from a minimum of 7°C (45°F) in July and August to a maximum of 28°C (83°F) in the summer months of January, February, and March. Precipitation peaks in January with 356 mm (14.0 in) and is relatively low during the dry months of June to September, averaging around 30 mm (1.2 in). The region enjoys a considerable amount of sunshine, particularly from March to October, with over 300 hours of sunlight per month. For more details, visit Mto wa Mbu climate.
Ngorongoro, Tanzania experiences a temperate climate with monthly temperatures ranging from a minimum of 8°C (46°F) in July to a maximum of 28°C (82°F) in March and October. The rainy season peaks between January and April, with January recording the highest precipitation at 683 mm (26.9 in), and a significant decrease in rainfall occurs from June to September. Despite its rainfall, Ngorongoro enjoys substantial sunshine hours throughout the year, reaching up to 358 hours in October. This combination of moderate temperatures, high rainfall, and abundant sunshine creates a unique ecological environment. For more details, visit Ngorongoro climate.
In conclusion, Arusha, Tanzania, presents a dynamic climate characterized by notable variations in temperature, precipitation, sunshine duration, UV Index, and daylight hours throughout the year. The region’s tropical savanna and highland influences create distinct seasonal trends that not only sustain its rich biodiversity but also support agricultural resilience. With high UV levels and consistent daylight, residents and visitors must take care to protect themselves from sun exposure while enjoying the outdoors. Overall, Arusha's climate serves as a vital component of its ecological balance and cultural life, making it a fascinating subject for further study and exploration.