diff --git a/esphome/components/pvvx_mithermometer/display/pvvx_display.h b/esphome/components/pvvx_mithermometer/display/pvvx_display.h
index 8637506bae..06837b94ab 100644
--- a/esphome/components/pvvx_mithermometer/display/pvvx_display.h
+++ b/esphome/components/pvvx_mithermometer/display/pvvx_display.h
@@ -60,13 +60,13 @@ class PVVXDisplay : public ble_client::BLEClientNode, public PollingComponent {
    * Valid values are from -99.5 to 1999.5. Smaller values are displayed as Lo, higher as Hi.
    * It will printed as it fits in the screen.
    */
-  void print_bignum(float bignum) { this->bignum_ = bignum * 10; }
+  void print_bignum(float bignum) { this->bignum_ = static_cast<int16_t>(bignum * 10); }
   /**
    * Print the small number
    *
    * Valid values are from -9 to 99. Smaller values are displayed as Lo, higher as Hi.
    */
-  void print_smallnum(float smallnum) { this->smallnum_ = smallnum; }
+  void print_smallnum(float smallnum) { this->smallnum_ = static_cast<int16_t>(smallnum); }
   /**
    * Print a happy face
    *
@@ -107,8 +107,8 @@ class PVVXDisplay : public ble_client::BLEClientNode, public PollingComponent {
   bool auto_clear_enabled_{true};
   uint32_t disconnect_delay_ms_ = 5000;
   uint16_t validity_period_ = 300;
-  uint16_t bignum_ = 0;
-  uint16_t smallnum_ = 0;
+  int16_t bignum_ = 0;
+  int16_t smallnum_ = 0;
   uint8_t cfg_ = 0;
 
   void setcfgbit_(uint8_t bit, bool value);