diff --git a/components/esp_hw_support/CMakeLists.txt b/components/esp_hw_support/CMakeLists.txt
index ba75fa1706..5f09311acd 100644
--- a/components/esp_hw_support/CMakeLists.txt
+++ b/components/esp_hw_support/CMakeLists.txt
@@ -16,6 +16,10 @@ if(${target} STREQUAL "esp32c6")
     list(APPEND priv_requires hal)
 endif()
 
+if(CONFIG_RTC_CLK_SRC_INT_RC32K)
+    message(WARNING "Internal RC32K clock is unstable at extreme temperatures and is not recommended for use.")
+endif()
+
 set(srcs "cpu.c" "port/${IDF_TARGET}/esp_cpu_intr.c" "esp_memory_utils.c" "port/${IDF_TARGET}/cpu_region_protect.c")
 if(NOT BOOTLOADER_BUILD)
     list(APPEND srcs "esp_clk.c"
diff --git a/components/esp_hw_support/port/esp32c6/Kconfig.rtc b/components/esp_hw_support/port/esp32c6/Kconfig.rtc
index 180a559f38..4a2e10d181 100644
--- a/components/esp_hw_support/port/esp32c6/Kconfig.rtc
+++ b/components/esp_hw_support/port/esp32c6/Kconfig.rtc
@@ -14,6 +14,9 @@ choice RTC_CLK_SRC
         select ESP_SYSTEM_RTC_EXT_OSC
     config RTC_CLK_SRC_INT_RC32K
         bool "Internal 32kHz RC oscillator"
+        help
+            Internal RC32K clock is unstable at extreme temperatures and is not recommended for use.
+            This option will be removed in IDF v6.0.
 endchoice
 
 config RTC_CLK_CAL_CYCLES
diff --git a/components/esp_hw_support/port/esp32h2/Kconfig.rtc b/components/esp_hw_support/port/esp32h2/Kconfig.rtc
index 180a559f38..4a2e10d181 100644
--- a/components/esp_hw_support/port/esp32h2/Kconfig.rtc
+++ b/components/esp_hw_support/port/esp32h2/Kconfig.rtc
@@ -14,6 +14,9 @@ choice RTC_CLK_SRC
         select ESP_SYSTEM_RTC_EXT_OSC
     config RTC_CLK_SRC_INT_RC32K
         bool "Internal 32kHz RC oscillator"
+        help
+            Internal RC32K clock is unstable at extreme temperatures and is not recommended for use.
+            This option will be removed in IDF v6.0.
 endchoice
 
 config RTC_CLK_CAL_CYCLES
diff --git a/components/esp_hw_support/port/esp32p4/Kconfig.rtc b/components/esp_hw_support/port/esp32p4/Kconfig.rtc
index 734afa90a3..1202c00841 100644
--- a/components/esp_hw_support/port/esp32p4/Kconfig.rtc
+++ b/components/esp_hw_support/port/esp32p4/Kconfig.rtc
@@ -16,6 +16,9 @@ choice RTC_CLK_SRC
         select ESP_SYSTEM_RTC_EXT_OSC
     config RTC_CLK_SRC_INT_RC32K
         bool "Internal 32kHz RC oscillator"
+        help
+            Internal RC32K clock is unstable at extreme temperatures and is not recommended for use.
+            This option will be removed in IDF v6.0.
 endchoice
 
 config RTC_CLK_CAL_CYCLES