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The state of the atmosphere at a given time and place, including temperature, humidity, precipitation, and wind.
Das Wetter in Berlin ist oft wechselhaft.
The weather in Berlin is often changeable.
In German, 'Wetter' is always capitalized as it is a noun.
Remember that 'Wetter' is always capitalized in German as it is a noun.
From Middle High German 'wetter', from Old High German 'wetar', related to Old English 'weder' and Old Norse 'veðr'.
In German, all nouns are capitalized, including 'Wetter'.