diff --git a/CHANGELOG.md b/CHANGELOG.md
index f8b400112..866e49273 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -30,6 +30,7 @@ All notable changes to this project will be documented in this file.
 - DALI received data decoding
 - ESP32 Ethernet using EthClockMode 3 (#22248)
 - ESP32 disable SPI DMA for uDisplay (broken since esp-idf 5.3 (core 3.1.0)) (#22264)
+- Sonoff WTS01 temperature sensor shows incorrect negative temperature (#19373)
 
 ### Removed
 - Berry Zigbee removed test code (#22263)
diff --git a/RELEASENOTES.md b/RELEASENOTES.md
index 0863a74ae..3f93a017e 100644
--- a/RELEASENOTES.md
+++ b/RELEASENOTES.md
@@ -179,6 +179,7 @@ The latter links can be used for OTA upgrades too like ``OtaUrl https://ota.tasm
 - PZEM continue energy monitoring when one phase fails [#21968](https://github.com/arendst/Tasmota/issues/21968)
 - BearSSL panic on ESP8266 in rare conditions [#22017](https://github.com/arendst/Tasmota/issues/22017)
 - ModbusBridge request and response logic [#22075](https://github.com/arendst/Tasmota/issues/22075)
+- Sonoff WTS01 temperature sensor shows incorrect negative temperature [#19373](https://github.com/arendst/Tasmota/issues/19373)
 - Autoconf prevent 'init.bat' from stopping on empty lines [#22158](https://github.com/arendst/Tasmota/issues/22158)
 - Zigbee extend timeout for MCU reboot from 5s to 10s [#22009](https://github.com/arendst/Tasmota/issues/22009)
 - Zigbee avoid disabling console serial on ESP32 and improved log messages [#22082](https://github.com/arendst/Tasmota/issues/22082)
diff --git a/tasmota/tasmota_xdrv_driver/xdrv_08_serial_bridge.ino b/tasmota/tasmota_xdrv_driver/xdrv_08_serial_bridge.ino
index 0eb9a0c43..0e6bbf279 100644
--- a/tasmota/tasmota_xdrv_driver/xdrv_08_serial_bridge.ino
+++ b/tasmota/tasmota_xdrv_driver/xdrv_08_serial_bridge.ino
@@ -226,7 +226,24 @@ void SerialBridgeInput(void) {
       if (9 == SBridge.in_byte_counter) {
         uint32_t *header = (uint32_t*)serial_bridge_buffer;
         if (0x04010155 == *header) {
-          SBridge.temperature = (float)serial_bridge_buffer[6] + ((float)serial_bridge_buffer[7] / 100.0f);
+          /*
+          14:43:26.718 WTS: buf6 0x01, buf7 0x5d, temp 1, dec 93     1.93
+          14:43:33.175 WTS: buf6 0x01, buf7 0x12, temp 1, dec 18     1.18
+          14:43:34.252 WTS: buf6 0x01, buf7 0x06, temp 1, dec 6      1.06
+          14:43:35.328 WTS: buf6 0x00, buf7 0x5d, temp 0, dec 93     0.93
+          14:43:42.862 WTS: buf6 0x00, buf7 0x0c, temp 0, dec 12     0.12
+          14:43:43.938 WTS: buf6 0x00, buf7 0x00, temp 0, dec 0      0.00
+          14:43:45.015 WTS: buf6 0x80, buf7 0x0c, temp 128, dec 12  -0.12
+          14:43:53.624 WTS: buf6 0x80, buf7 0x5d, temp 128, dec 93  -0.93
+          14:43:54.700 WTS: buf6 0x81, buf7 0x06, temp 129, dec 6   -1.06
+          */
+          uint8_t temp = serial_bridge_buffer[6];
+          int sign = 1;
+          if (temp > 127) {
+            temp -= 128;
+            sign = -1;
+          }
+          SBridge.temperature = sign * ((float)temp + ((float)serial_bridge_buffer[7] / 100.0f));
         }
       }
     }