Do you need to know, when is the best time to go to Bolivia? Then you should take a look here, what weather you can expect there during the year.
The climate of Bolivia varies strongly with altitude. You can expect humid and tropical weather in some places, but cold and semiarid in other places, even polar in the western Andes. The summers are usually warm and humid in the east, but dry in the west. Winters are usually very cold in the west.
When speaking about the usual weather in this state, the information is relevant for example for these popular places: Altiplano, Atocha, Beni, Chacaltaya, Challapampa, Challapata, Chochís, Chuquisaca, Cochabamba, Concepción, Copacabana, Cordillera de los Frailes, Coroico, Desaguadero, Guayaramerín, Huayna Potosí, Isla de la Luna, Isla del Sol, La Paz, Llallagua, Madidi National Park, Noel Kempff Mercado National Park, Oruro, Pando, Potosí, Puerto Quijarro, Puerto Suárez, Quillacollo, Quime, Riberalta, Rurrenabaque, Sajama National Park, Salar de Uyuni, Samaipata, San Borja, San Ignacio de Velasco, San Javier, San José de Chiquitos, San Juan, San Miguel de Velasco, San Miguel del Bala, San Pedro de Quemes, San Rafael de Velasco, Santa Ana de Velasco, Santa Cruz, Santiago de Chiquitos, Sorata, Sub Andean Bolivia, Sucre, Tarabuco, Tarata, Tarija, Tiwanaku, Torotoro National Park, Trinidad, Tropical Lowlands, Tupiza, Uyuni, Yampupata, Yumani.
Let's look now what weather you can expect in the area around the capital and in many other cities. The warmest month here is February, the average maximum temperature is 14.5 ℃ (58.1 ℉). The average minimum temperature in this month is 7.9 ℃ (46.22 ℉). The coldest month here is June, the average maximum temperature is 12.5 ℃ (54.5 ℉). The average minimum temperature in this month is 4.2 ℃ (39.56 ℉). The most rainy month here is November, the average number of rainy days is 28.7. The least rainy month here is July, the average number of rainy days is 3.5. 
When travelling to some places in Bolivia, always consider the altitude of the the place as well. The highest point here is Nevado Sajama (6542 m) and the lowest point is Rio Paraguay (90 m). So there are huge differences in altitudes in this country and the weather is very different in them therefore. Keep in mind, that the temperature usually decreases by 1.2 - 1.9 ℃ (2.2 - 3.5 ℉) per 200 m (656 ft), depending on the other conditions. (And we should add, that in the very special condition named thermal inversion even the temperature may be higher in higher altitudes.)
Typical (usual) weather in Bolivia in January is this: The average highest temperature in Bolivia in January is 14.2 ℃ (57.56 ℉). The average lowest temperature is 8.1 ℃ (46.58 ℉). At the beginning of January you can expect lower temperatures, the average highest temperature is around 14.1 ℃ (57.38 ℉). At the end of January you can expect higher temperatures, the average highest temperature is around 14.35 ℃ (57.83 ℉). The average number of rainy days in January is 28.2. The average rainfall is 355 mm (look here, what this number means). When planning your travel, please, keep in mind, that actual weather may differ from these average values. The length of the day at the beginning of this month is approximately 13:05 (hours and minutes), in the middle of the month 12:59 and at the end of the month 12:50.These numbers above are valid primarily for the capital and the area around it. It is important to say, that the weather may differ significantly in different altitudes, especially in mountains.Typical (usual) weather in Bolivia in February is this: The average highest temperature in Bolivia in February is 14.5 ℃ (58.1 ℉). The average lowest temperature is 7.9 ℃ (46.22 ℉). At the beginning of February you can expect lower temperatures, the average highest temperature is around 14.35 ℃ (57.83 ℉). At the end of February you can expect lower temperatures, the average highest temperature is around 14.25 ℃ (57.65 ℉). The average number of rainy days in February is 24.2. The average rainfall is 265 mm (look here, what this number means). When planning your travel, please, keep in mind, that actual weather may differ from these average values. The length of the day at the beginning of this month is approximately 12:50 (hours and minutes), in the middle of the month 12:38 and at the end of the month 12:24.These numbers above are valid primarily for the capital and the area around it. It is important to say, that the weather may differ significantly in different altitudes, especially in mountains.
Typical (usual) weather in Bolivia in March is this: The average highest temperature in Bolivia in March is 14 ℃ (57.2 ℉). The average lowest temperature is 7.8 ℃ (46.04 ℉). At the beginning of March you can expect higher temperatures, the average highest temperature is around 14.25 ℃ (57.65 ℉). At the end of March you can expect lower temperatures, the average highest temperature is around 13.75 ℃ (56.75 ℉). The average number of rainy days in March is 23.2. The average rainfall is 241 mm (look here, what this number means). When planning your travel, please, keep in mind, that actual weather may differ from these average values. The length of the day at the beginning of this month is approximately 12:24 (hours and minutes), in the middle of the month 12:10 and at the end of the month 11:56.These numbers above are valid primarily for the capital and the area around it. It is important to say, that the weather may differ significantly in different altitudes, especially in mountains.Typical (usual) weather in Bolivia in April is this: The average highest temperature in Bolivia in April is 13.5 ℃ (56.3 ℉). The average lowest temperature is 7.8 ℃ (46.04 ℉). At the beginning of April you can expect higher temperatures, the average highest temperature is around 13.75 ℃ (56.75 ℉). At the end of April you can expect lower temperatures, the average highest temperature is around 13.25 ℃ (55.85 ℉). The average number of rainy days in April is 22.5. The average rainfall is 174 mm (look here, what this number means). When planning your travel, please, keep in mind, that actual weather may differ from these average values. The length of the day at the beginning of this month is approximately 11:56 (hours and minutes), in the middle of the month 11:43 and at the end of the month 11:31.These numbers above are valid primarily for the capital and the area around it. It is important to say, that the weather may differ significantly in different altitudes, especially in mountains.Typical (usual) weather in Bolivia in May is this: The average highest temperature in Bolivia in May is 13 ℃ (55.4 ℉). The average lowest temperature is 7.6 ℃ (45.68 ℉). At the beginning of May you can expect higher temperatures, the average highest temperature is around 13.25 ℃ (55.85 ℉). At the end of May you can expect lower temperatures, the average highest temperature is around 12.75 ℃ (54.95 ℉). The average number of rainy days in May is 16.5. The average rainfall is 62 mm (look here, what this number means). When planning your travel, please, keep in mind, that actual weather may differ from these average values. The length of the day at the beginning of this month is approximately 11:31 (hours and minutes), in the middle of the month 11:20 and at the end of the month 11:13.These numbers above are valid primarily for the capital and the area around it. It is important to say, that the weather may differ significantly in different altitudes, especially in mountains.Typical (usual) weather in Bolivia in June is this: The average highest temperature in Bolivia in June is 12.5 ℃ (54.5 ℉). The average lowest temperature is 4.2 ℃ (39.56 ℉). At the beginning of June you can expect higher temperatures, the average highest temperature is around 12.75 ℃ (54.95 ℉). At the end of June you can expect lower temperatures, the average highest temperature is around 12.5 ℃ (54.5 ℉). The average number of rainy days in June is 7.4. The average rainfall is 6 mm (look here, what this number means). When planning your travel, please, keep in mind, that actual weather may differ from these average values. The length of the day at the beginning of this month is approximately 11:13 (hours and minutes), in the middle of the month 11:09 and at the end of the month 11:09.These numbers above are valid primarily for the capital and the area around it. It is important to say, that the weather may differ significantly in different altitudes, especially in mountains.Typical (usual) weather in Bolivia in July is this: The average highest temperature in Bolivia in July is 12.5 ℃ (54.5 ℉). The average lowest temperature is 4.1 ℃ (39.38 ℉). At the beginning of July you can expect lower temperatures, the average highest temperature is around 12.5 ℃ (54.5 ℉). At the end of July you can expect lower temperatures, the average highest temperature is around 12.5 ℃ (54.5 ℉). The average number of rainy days in July is 3.5. The average rainfall is 3.3 mm (look here, what this number means). When planning your travel, please, keep in mind, that actual weather may differ from these average values. The length of the day at the beginning of this month is approximately 11:09 (hours and minutes), in the middle of the month 11:13 and at the end of the month 11:21.These numbers above are valid primarily for the capital and the area around it. It is important to say, that the weather may differ significantly in different altitudes, especially in mountains.Typical (usual) weather in Bolivia in August is this: The average highest temperature in Bolivia in August is 12.5 ℃ (54.5 ℉). The average lowest temperature is 4.5 ℃ (40.1 ℉). At the beginning of August you can expect lower temperatures, the average highest temperature is around 12.5 ℃ (54.5 ℉). At the end of August you can expect higher temperatures, the average highest temperature is around 12.75 ℃ (54.95 ℉). The average number of rainy days in August is 10.5. The average rainfall is 15.1 mm (look here, what this number means). When planning your travel, please, keep in mind, that actual weather may differ from these average values. The length of the day at the beginning of this month is approximately 11:21 (hours and minutes), in the middle of the month 11:31 and at the end of the month 11:43.These numbers above are valid primarily for the capital and the area around it. It is important to say, that the weather may differ significantly in different altitudes, especially in mountains.Typical (usual) weather in Bolivia in September is this: The average highest temperature in Bolivia in September is 13 ℃ (55.4 ℉). The average lowest temperature is 5.2 ℃ (41.36 ℉). At the beginning of September you can expect lower temperatures, the average highest temperature is around 12.75 ℃ (54.95 ℉). At the end of September you can expect higher temperatures, the average highest temperature is around 13.1 ℃ (55.58 ℉). The average number of rainy days in September is 18.2. The average rainfall is 100.5 mm (look here, what this number means). When planning your travel, please, keep in mind, that actual weather may differ from these average values. The length of the day at the beginning of this month is approximately 11:43 (hours and minutes), in the middle of the month 11:57 and at the end of the month 12:10.These numbers above are valid primarily for the capital and the area around it. It is important to say, that the weather may differ significantly in different altitudes, especially in mountains.Typical (usual) weather in Bolivia in October is this: The average highest temperature in Bolivia in October is 13.2 ℃ (55.76 ℉). The average lowest temperature is 6.8 ℃ (44.24 ℉). At the beginning of October you can expect lower temperatures, the average highest temperature is around 13.1 ℃ (55.58 ℉). At the end of October you can expect higher temperatures, the average highest temperature is around 13.3 ℃ (55.94 ℉). The average number of rainy days in October is 23.2. The average rainfall is 140.8 mm (look here, what this number means). When planning your travel, please, keep in mind, that actual weather may differ from these average values. The length of the day at the beginning of this month is approximately 12:10 (hours and minutes), in the middle of the month 12:24 and at the end of the month 12:38.These numbers above are valid primarily for the capital and the area around it. It is important to say, that the weather may differ significantly in different altitudes, especially in mountains.Typical (usual) weather in Bolivia in November is this: The average highest temperature in Bolivia in November is 13.4 ℃ (56.12 ℉). The average lowest temperature is 7.5 ℃ (45.5 ℉). At the beginning of November you can expect lower temperatures, the average highest temperature is around 13.3 ℃ (55.94 ℉). At the end of November you can expect higher temperatures, the average highest temperature is around 13.7 ℃ (56.66 ℉). The average number of rainy days in November is 28.7. The average rainfall is 265 mm (look here, what this number means). When planning your travel, please, keep in mind, that actual weather may differ from these average values. The length of the day at the beginning of this month is approximately 12:38 (hours and minutes), in the middle of the month 12:50 and at the end of the month 12:59.These numbers above are valid primarily for the capital and the area around it. It is important to say, that the weather may differ significantly in different altitudes, especially in mountains.Typical (usual) weather in Bolivia in December is this: The average highest temperature in Bolivia in December is 14 ℃ (57.2 ℉). The average lowest temperature is 7.8 ℃ (46.04 ℉). At the beginning of December you can expect lower temperatures, the average highest temperature is around 13.7 ℃ (56.66 ℉). At the end of December you can expect higher temperatures, the average highest temperature is around 14.1 ℃ (57.38 ℉). The average number of rainy days in December is 27.5. The average rainfall is 245 mm (look here, what this number means). When planning your travel, please, keep in mind, that actual weather may differ from these average values. The length of the day at the beginning of this month is approximately 12:59 (hours and minutes), in the middle of the month 13:05 and at the end of the month 13:06.These numbers above are valid primarily for the capital and the area around it. It is important to say, that the weather may differ significantly in different altitudes, especially in mountains.