diff --git a/homeassistant/components/tado/climate.py b/homeassistant/components/tado/climate.py
index 47bd2bc16f3..3261b6e212d 100644
--- a/homeassistant/components/tado/climate.py
+++ b/homeassistant/components/tado/climate.py
@@ -401,7 +401,7 @@ class TadoClimate(TadoZoneEntity, ClimateEntity):
 
     def set_timer(
         self,
-        temperature: float | None = None,
+        temperature: float,
         time_period: int | None = None,
         requested_overlay: str | None = None,
     ):