Here's why:
* "Warmest" can refer to surface temperature or atmospheric temperature. Venus has a scorching hot surface temperature, but its upper atmosphere is actually relatively cool.
* "Cloudy" can refer to visible clouds, or to a dense atmosphere. Venus is famous for its thick, opaque clouds of sulfuric acid. Jupiter also has thick clouds, but they are mostly composed of ammonia and water.
Considering both definitions, the answer might be Venus.
* Surface temperature: Venus has the hottest surface temperature of any planet in our solar system, reaching over 900 degrees Fahrenheit (482 degrees Celsius).
* Cloud cover: Venus has a dense, thick cloud cover that completely obscures its surface.
However, Jupiter could be a contender if we're focusing on atmospheric temperature and a more general definition of "cloudy".
* Atmospheric temperature: Jupiter's upper atmosphere can reach temperatures of -234 degrees Fahrenheit (-148 degrees Celsius), which is significantly cooler than Venus's surface. However, Jupiter has a very thick atmosphere with a variety of cloud layers.
* Cloud cover: Jupiter has a swirling, colorful atmosphere full of different cloud layers. The planet's signature "Great Red Spot" is actually a giant storm.
Ultimately, there's no single, definitive answer to the question of the "warmest but cloudy planet". It depends on how you define the terms!
