The Amboseli National Park generally has a hot and dry weather since the air discharges its moisture on Mount Kilimanjaro, where the rains occur and where it snows, therefore the air reaching this zone is usually devoided of moisture.
The only rains occur during the two rainy seasons: the season of the long rains from April to May and the small rainy season from November to December.
The park is open all year round but the best time for sightings of mammals, who meet at the limited sources of water present here, is during the dry season from June to October, with warm and dry days and from January to March with hot and dry days.
From November to January, it is the best time for birdwatching, in these months in fact in the park, in addition to residents, even birds migrating here during the palearctic winter, are present.                         
During the dry season the park is very arid, its terrain consists of volcanic ashes spilled from Mount Kilimanjaro more than 250,000 years ago and, with the absence of rains a lot of dust is raised and, due to the terrain and drafts, this creates several reels.
In addition, the crystallized salt, deposited on the soil surface as a result of the evaporation of rainwater filling the basin of the Lake Amboseli, often creates the curious effect of mirages.
During the rainy season, sightings are a little more difficult because the water sources are available a bit everywhere in the park and then the animals are dispersed; furthermore, if the rains are plentiful, roads are likely to become muddy and more difficult to practice.