February is one of the best months for safaris, as it's calving season in the Southern Serengeti, just a short flight from Arusha. Thousands of wildebeest, zebras, and gazelles give birth. This draws in predators and makes for thrilling wildlife encounters.

The weather remains warm (14-28°C / 57-82°F), with short rains keeping the landscapes lush but not overly wet. Within Arusha, the city is vibrant with local life, and waterfalls like Napuru are at their most powerful. Hiking Mount Meru is also great this time of year, as the skies are clearer, offering stunning views of Kilimanjaro in the distance. Tourist numbers begin to increase, so booking accommodations early is advisable.

March marks the beginning of the long rainy season in Arusha, with increased rainfall and humidity. Temperatures remain comfortable, ranging from 14-27°C (57-81°F), but afternoon downpours become more frequent. The city and surrounding landscapes flourish with greenery, creating breathtaking scenery for photography and nature lovers.

While some safari roads in the Serengeti and Ngorongoro become muddy, Arusha National Park remains a great option for wildlife spotting, particularly for giraffes, colobus monkeys, and waterbirds. Fewer tourists visit in March, making it a peaceful time for cultural experiences, market tours, and coffee plantation visits.

April is the wettest month of the year, with frequent heavy rains, making some outdoor activities challenging. Temperatures hover around 14-26°C (57-79°F), and while mornings can be sunny, afternoons often bring downpours. This is low season for tourism, meaning discounted rates on accommodations and safaris.

While wildlife is still present, some parks may have restricted access due to muddy conditions. However, birdwatching is exceptional this time of year, with numerous migratory and wetland species thriving in the rainy environment. For travelers who don’t mind the rain, this is a fantastic time to experience Arusha’s museums, markets, and cultural centers with minimal crowds.

May, or the Emerald Season, marks the tail end of the long rainy season. While rainfall gradually decreases, occasional showers persist. Temperatures range from 13-25°C (55-77°F), and the air is fresh and crisp after weeks of rain. The landscapes are at their most lush, making this a beautiful time for photographers and nature lovers.

While some safari roads remain muddy, Arusha National Park is still accessible, offering blooming scenery and wildlife without the crowds. This is one of the least crowded months, meaning great deals on accommodations and a more authentic experience when visiting local markets and cultural sites.

June begins the dry season, with clear skies, cooler temperatures (11-24°C / 52-75°F), and minimal rain. The greenery from the rains remains, but the ground begins to dry, which makes it easier to explore parks and natural attractions. This is a fantastic time for wildlife safaris, as animals start congregating around diminishing water sources, making sightings more predictable.

Mount Meru trekking conditions improve, offering breathtaking views of Mount Kilimanjaro. June is also the beginning of peak tourist season, so it’s a good idea to book accommodations and tours in advance to secure your spot.

July is one of the best months to visit Arusha, as the dry season is in full swing. Clear skies, comfortable temperatures (10-23°C / 50-73°F), and excellent wildlife viewing mean that the conditions are ideal for safari. Animals gather around rivers and waterholes, making for spectacular game drives in Arusha National Park and beyond.

This is also a popular time for Mount Meru treks, as the cool, dry air provides excellent hiking conditions. In the city, markets, cultural sites, and cafes are lively with travelers. However, as it's peak season, you should book accommodations and tours well in advance to ensure you have plenty of available options.

August continues Arusha and the Northern Circuit’s peak season, with cool mornings, warm afternoons (10-24°C / 50-75°F), and almost no rain. The city of Arusha is bustling with international travelers, creating a vibrant atmosphere in local markets and restaurants.

Safari-goers can expect fantastic wildlife sightings, as dry conditions force animals to gather near remaining water sources. This is also one of the best months for hiking Mount Meru, with clear views of Kilimanjaro and minimal cloud cover. Day trips to Lake Duluti, Maasai villages, and waterfalls are particularly enjoyable with the mild, dry weather. Due to high demand, it’s essential to book in advance—typically around 6 months before your trip—if you plan to visit during August.

September offers perfect safari conditions, with dry, warm days (11-26°C / 52-79°F) and clear skies. While the mornings and evenings can be chilly, the days begin to subtly heat up.

With little rainfall over the past several months, wildlife viewing is now at its peak. Animals remain concentrated around the limited water sources in Arusha National Park and beyond. The city’s markets, coffee shops, and cultural sites remain lively, yet September sees slightly fewer tourists than July and August, making it a great time to visit. Mount Meru hikes are still excellent, with clear summit views. This is also a prime month for photography, as golden light bathes the landscape, highlighting the beauty of Arusha and its surroundings.

October remains mostly dry, with temperatures rising slightly (13-27°C / 55-81°F). Wildlife safaris continue to be outstanding, though some animals begin dispersing as the first light rains arrive later in the month. This is a great time to visit hot springs, lakes, and waterfalls, as they start to regain their flow.

Birdwatching improves, as migratory species begin arriving. While still a popular month, October sees fewer crowds than peak-season months, making it an excellent balance of great weather, abundant wildlife, and fewer tourists.

November marks the start of the short rainy season, with intermittent showers and rising humidity. Temperatures remain pleasant (14-27°C / 57-81°F), and while some rainfall occurs, it’s usually in short bursts, leaving plenty of time for exploration. The landscape begins to transform, with fresh greenery emerging, making this an excellent time for photography and birdwatching, as migratory birds arrive.

While wildlife starts to disperse with new water sources, Arusha National Park still offers fantastic sightings. Tourist numbers aren’t at their peak nor their lowest during this time, which means you may be able to score slightly discounted rates at your chosen accommodation.

December in Arusha is lively and blooming, as the short rains subside and holiday travelers arrive. With temperatures ranging from 14-28°C (57-82°F), the weather is warm and comfortable, though occasional showers keep the landscape green and vibrant.

Safari experiences remain excellent, with baby animals beginning to appear, and the city comes alive with festive energy. December is a great time for hiking, market visits, and day trips to hot springs and waterfalls, as the scenery is at its most beautiful. As a popular travel time, especially in the latter half of the month, booking accommodations and tours in advance is highly recommended.