from day to day
US /frʌm deɪ tə deɪ/
UK /frʌm deɪ tə deɪ/

1.
considering only one day at a time, without planning for the future
:
•
We're living from day to day, not knowing what tomorrow brings.
•
His financial situation is so unstable that he has to live from day to day.
2.
changing frequently or unpredictably
:
•
The weather here changes from day to day.
•
Her mood can vary greatly from day to day.