diff --git a/esphome/components/bme280_base/bme280_base.cpp b/esphome/components/bme280_base/bme280_base.cpp
index 3c6e15cbca..76e20836c7 100644
--- a/esphome/components/bme280_base/bme280_base.cpp
+++ b/esphome/components/bme280_base/bme280_base.cpp
@@ -265,8 +265,8 @@ float BME280Component::read_temperature_(const uint8_t *data, int32_t *t_fine) {
   int32_t const var2 = (((((adc >> 4) - t1) * ((adc >> 4) - t1)) >> 12) * t3) >> 14;
   *t_fine = var1 + var2;
 
-  float const temperature = (*t_fine * 5 + 128) >> 8;
-  return temperature / 100.0f;
+  float const temperature = (*t_fine * 5 + 128);
+  return temperature / 25600.0f;
 }
 
 float BME280Component::read_pressure_(const uint8_t *data, int32_t t_fine) {
diff --git a/esphome/components/bmp280/bmp280.cpp b/esphome/components/bmp280/bmp280.cpp
index a5b2517893..c92daa07fb 100644
--- a/esphome/components/bmp280/bmp280.cpp
+++ b/esphome/components/bmp280/bmp280.cpp
@@ -200,8 +200,8 @@ float BMP280Component::read_temperature_(int32_t *t_fine) {
   int32_t var2 = (((((adc >> 4) - t1) * ((adc >> 4) - t1)) >> 12) * t3) >> 14;
   *t_fine = var1 + var2;
 
-  float temperature = (*t_fine * 5 + 128) >> 8;
-  return temperature / 100.0f;
+  float temperature = (*t_fine * 5 + 128);
+  return temperature / 25600.0f;
 }
 
 float BMP280Component::read_pressure_(int32_t t_fine) {