The seasons in the lowlands of the Amazon Basin are less pronounced than in other parts of Bolivia, and temperatures are high year-round. Heavy rain falls during the summer (Nov-Apr) in unrelenting downpours that fill the streets with mud and the sound of croaking frogs. Although winter is drier than summer, it also sees a good measure of the wet stuff. If you're unlucky you may experience the unpredictable surazo , a cold wind blowing from Patagonia and the Argentine pampas, which produces frost and a dramatic drop in temperature, even in the hottest parts of the jungle.

The saying 'Las golondrinas nunca migran de Cochabamba' ('The swallows never migrate from Cochabamba') aptly describes what cochabambinos believe is the world's most comfortable climate, with warm, dry, sunny days and cool nights. The coolest time of year is winter (June-August), with clear skies and mild temperatures.

In summer (November to April) the climate can be harsh: rain falls most afternoons, the canyon may fill with clouds and steep streets often become torrents of runoff. In winter (May to October) days can be slightly cooler, with temperatures reaching 18-20°C (64-68°F). At night it often dips below freezing and you'll need to come prepared with warm clothing all year round.

Oruro offer typical Altiplano weather and it means frezzing temperatures at night and hot days (blue skies all day).

By Bolivian standards, Potosí is chilly (particularly at night) and it's one of the few big cities where you'll see snow. What little rain there is falls mostly in summer and, although the temperature range throughout the day can be great, it varies little from month to month.

Santa Cruz and the Eastern Lowlands have a semi-tropical climate - the region is much warmer than the high-altitude Andean towns and cities. The dry winter months (May-Oct) are the most pleasant and comfortable time to travel here. The rainy season (Nov-Apr) can be miserable in the lowlands, with mud, high humidity, biting insects and relentless tropical downpours. Getting to and from Santa Cruz overland can be tough at this time. December and January are the wettest months.

Set in a valley surrounded by low mountains, Sucre enjoys a mild and comfortable climate. The best periods are in-between seasons. High summer is mild in terms of temperature but is marked by significant rainfall, while winter is dry but chilly, especially at night.

Tarija offers comfortable weather all year round, like valleys in Bolivia.

The seasons in the lowlands of the Amazon Basin are less pronounced than in other parts of Bolivia, and temperatures are high year-round. Heavy rain falls during the summer (Nov-Apr) in unrelenting downpours that fill the streets with mud and the sound of croaking frogs. Although winter is drier than summer, it also sees a good measure of the wet stuff. If you're unlucky you may experience the unpredictable surazo , a cold wind blowing from Patagonia and the Argentine pampas, which produces frost and a dramatic drop in temperature, even in the hottest parts of the jungle.

Tupiza located in the union of two rivers gives nice weather in summer (fresh) but coul be cold in winter, but anyway, Tupiza is a nice spot to relax and chill-out.

Mention Uyuni to a Bolivian and they will whistle and emphasize 'harto frío' - extreme cold! Yes, harsh temperatures and chill winds characterize the southern Antiplano. Climatically, the best months to visit are August, September and October, after the worst of the winter chills and before the summer rains. From May to early July, night-time temperatures combined with stiff winds can lower the windchill temperature to -40°C (-40°F). Summer is warmer but, for an arid area, there's quite a lot of rainfall between November and March. At any time of year you'll need protection against sun, wind and cold.