Monthly cost-of-living numbers are useful, but they rarely describe the month you arrive. Your first month is a setup month, and setup months behave differently.
You may pay for temporary lodging while touring long-term rentals, a deposit plus the first month of rent, translations, local transport to appointments, household basics, SIM cards, and a few comfort purchases that help an unfamiliar place feel manageable.
Keep two budgets
Maintain a recurring monthly budget and a separate relocation fund. The second should cover one-time costs and enough margin to change plans without panic.
That separation keeps a high first month from convincing you that every month will be expensive—and keeps a low monthly estimate from leaving you underprepared for arrival.