Map from Google - Zambia

Zambia is a country located in southern Africa, almost entirely covered by a plateau, which temper the climate, making the temperatures generally acceptable for most of the year.
In Zambia, the climate is tropical or sub-tropical, depending on altitude, with a hot humid and rainy season from mid-November to March, and a dry season from April to mid-November. In the dry season, there's a cool period from mid-May to mid-August, and a progressively warmer period from September to mid-November, when the heat becomes torrid, that is, intense but with low relative humidity. In fact, October is typically the hottest month of the year. On the other hand, moisture is high during the rainy season, which begins around the middle of November, and lasts until the end of March.
During the cooler period, from mid-May to mid-August, at night it can get cold, especially in the southern regions, where the night temperature can drop to around freezing. The driest months are June, July and August, when it practically never rains. During the dry season, the weather conditions are generally good: the sky is clear and the air is limpid. Sometimes, however, due to the ancestral custom of burning crop residues in order to prepare the land for crop rotations, the air may smell of smoke, and some scattered fires can be seen. Instead, in October and November, the first thunderstorms after the dry season can cause natural fires, when lightning strike trees.
In the rainy season, the rains occur mainly in the form of downpour or thunderstorm. Floods caused by heavy rains are quite normal in Zambia. The wettest areas are the northern regions, namely North-Western Province, Copperbelt Province and Northern Province, where precipitation exceeds 80 inches per year, and in some areas it can reach 55 in. The most arid area is the south-west, the southern part of Barotseland, where the Zambezi River separates Zambia from Namibia and Zimbabwe: in this area the annual rainfall is around 24 in, or even a little below. The Zambezi River, on the border with Zimbabwe feeds the magnificent Victoria Falls, about 330 feet high, twice as wide and one and a half taller than the Niagara Falls.
The temperature in Zambia varies mainly according to altitude. The plateau's altitude ranges mostly from 3,000 to 5,000 feet, but some areas descend to almost 1,600 feet, in the far south along the Zambezi River and even in the east, in the Luangwa National Park, where the Luangwa River flows. On the contrary, in the north the altitude reaches 6,000 feet near Mbala, while in the north-east, near the border with Malawi, where the cool grassland of the Nyika National Park is found, it reaches even 7,200 feet. In the far north, a small portion of Lake Tanganyika belongs to Zambia, and its banks are at 2,500 feet, while the smaller Lake Mweru, located at no great distance, sits at 3,000 feet; further south but still in the Northern Province, Lake Bangweulu is at 3,770 feet. The Lukanga Swamp, located north-east of the Kafue National Park, is a vast wetland area at 3,600 feet above sea level.
The capital city is Lusaka, located at 4,100 feet above sea level. In December, January and February, at the height of the rainy season, here daytime temperatures hover around 79/80 °F, while the night temperatures are around 64 °F. In these months, about 8 in of rain per month fall. In the coolest months, June and July, the temperature stay instead around 73 °F in the daytime, and 50 °F at night; sometimes, however, the night temperature may approach freezing. At the end of the dry season, from September to November, the highest temperatures of the year are recorded, with peaks of about 95/100 °F.
Here are the average temperatures of Lusaka.
Average temperatures - Lusaka
Min (°F)636363595550505459636463
Max (°F)797981797773737784888681

Rainfall in Lusaka amounts to 33 inches per year, with a maximum from December to February, while from May to October it almost never rains. Here is the average precipitation.
Average precipitation - Lusaka
Prec. (in)

Livingstone, a city named after the Scottish explorer who discovered the Victoria Falls, is located in the far south, at 3,000 feet above sea level, just a few miles from the falls. Here the heat is intense from September to November, with peaks of 105 °F, while due to the more southerly location, winter nights are cold even though the altitude is slightly lower than in the capital: the cold record is 28.5 °F.
Here are the average temperatures.
Average temperatures - Livingstone
Min (°F)666663595245455059666666
Max (°F)848486868277778290959186

Kafue National Park, Zambia

When to go

The best time to go to Zambia is from May to August: it's the coolest of the year, and it's dry and sunny. However, nights can be cold, especially above 3,300 feet.
In September and October, the heat is intense, with peaks of 105 °F, especially at an altitude of about 3,300 feet or less. During the rainy season, not only the weather is hot and muggy, but the rains can cause flooding and make difficult to travel.

What to pack

In winter (June to August): light clothes for the day, as well as sweater, jacket and hat for the evening; sun hat, sunscreen.
In summer (December to February): light clothes for the day, sun hat; a sweatshirt and a spring jacket for the evening; light raincoat or umbrella.