Under the weather
Feeling ill or unwell.

Every cloud has a silver lining
There is something good in every bad situation.

Steal someone's thunder
To take credit for someone else's achievements.

Rain on someone's parade
To spoil someone's plans or happiness.

The calm before the storm
A peaceful period before a chaotic or difficult time.

It's raining cats and dogs
It's raining heavily.

Weather the storm
To endure a difficult situation.

Make hay while the sun shines
Take advantage of favorable conditions.

Chase rainbows
Pursue unrealistic goals or dreams.

In a fog
Confused or unable to think clearly.

Shoot the breeze
To engage in casual or light conversation.

Weather vane
A person who changes their opinions or beliefs frequently.

Snowed under
Overwhelmed with work or responsibilities.

A fair-weather friend
A person who is only a friend in good times.

Break the ice
To initiate conversation in a social setting.

Light at the end of the tunnel
A sign of hope or improvement after difficulties.

A storm in a teacup
A lot of fuss about something trivial.

Take a rain check
To postpone or decline an invitation but express interest in doing it later.

Throw caution to the wind
To act recklessly without worrying about the consequences.

Bite the dust
To fail or come to an end.