The nightly low in Lebanon during January 2026 was around 3°C to 7°C in the coastal areas, with Beirut specifically showing overnight lows mostly in the single digits Celsius and dipping to about 8.6°C at the coolest point in the available January history data I found.

What that means

  • Coastal Lebanon: typically around 7°C at night in January.
  • Beirut January 2026: daily overnight lows in the historical record ranged down to about 8.6°C on the coldest listed day.
  • Higher inland and mountain areas: nights can be much colder, sometimes near or below freezing in January.

Quick context

January is usually Lebanon’s coldest month, so lower nighttime temperatures are normal, especially outside the coast.

TL;DR: for Lebanon in January 2026, expect nightly lows roughly 3°C–7°C on the coast , and colder inland/mountain conditions.