Weather

Weather is game element that is mostly visible in Map View and causes that Pokémon of certain types are stronger - their attacks are more or less effective. They allso appear more frequently in wild and give more Stardust when caught depening on what weather condition is.

Types of weather
There are currently 6 types of weather in game.

Sunny
Boosted Types:

Partly Cloudy
It doesn't seem currently that any types are boosted while weather is partly cloudy.

Windy
Boosted Types:

Rainy
Boosted Types:

Foggy
Boosted Types:

Snowy
Boosted Types:

Trivia

 * This feature was introduced along with Pokémon from Hoenn region on December, 2017.
 * Several weather conditions like Rain or Snow causes visual effects in Pokémon Encounter screen.