Insert the appropriate homonym
This week's ______ will be gloomy according to the forecast.

Weather

The correct homonym for the sentence "This week's ______ will be gloomy according to the forecast" is weather.

• Whether is a conjunction used to introduce a clause expressing doubt or choice.
• Weather is the state of the atmosphere at a particular place and time.
• Wether is a male sheep.

In the sentence "This week's ______ will be gloomy according to the forecast", the speaker is referring to the state of the atmosphere, which is called weather. Therefore, the correct homonym is weather.