diff --git a/firmware/application/Makefile b/firmware/application/Makefile
index 5149b13c..bd488ea7 100755
--- a/firmware/application/Makefile
+++ b/firmware/application/Makefile
@@ -180,6 +180,7 @@ CPPSRC = main.cpp \
          log_file.cpp \
          manchester.cpp \
          string_format.cpp \
+         temperature_logger.cpp \
          ../common/utility.cpp \
          ../common/chibios_cpp.cpp \
          ../common/debug.cpp \
diff --git a/firmware/application/main.cpp b/firmware/application/main.cpp
index a30bba25..21a5874e 100755
--- a/firmware/application/main.cpp
+++ b/firmware/application/main.cpp
@@ -129,6 +129,8 @@ private:
 
 	void handle_rtc_tick() {
 		sd_card::poll_inserted();
+
+		portapack::temperature_logger.second_tick();
 	}
 
 	static ui::Widget* touch_widget(ui::Widget* const w, ui::TouchEvent event) {
diff --git a/firmware/application/portapack.cpp b/firmware/application/portapack.cpp
index 1491fe6a..e9460c50 100644
--- a/firmware/application/portapack.cpp
+++ b/firmware/application/portapack.cpp
@@ -65,6 +65,8 @@ ReceiverModel receiver_model {
 	clock_manager
 };
 
+TemperatureLogger temperature_logger;
+
 class Power {
 public:
 	void init() {
diff --git a/firmware/application/portapack.hpp b/firmware/application/portapack.hpp
index ae424f36..cbe0b665 100644
--- a/firmware/application/portapack.hpp
+++ b/firmware/application/portapack.hpp
@@ -29,6 +29,7 @@
 #include "lcd_ili9341.hpp"
 
 #include "radio.hpp"
+#include "temperature_logger.hpp"
 
 namespace portapack {
 
@@ -45,6 +46,8 @@ extern si5351::Si5351 clock_generator;
 
 extern ReceiverModel receiver_model;
 
+extern TemperatureLogger temperature_logger;
+
 void init();
 void shutdown();
 
diff --git a/firmware/application/temperature_logger.cpp b/firmware/application/temperature_logger.cpp
new file mode 100644
index 00000000..b2317ab9
--- /dev/null
+++ b/firmware/application/temperature_logger.cpp
@@ -0,0 +1,65 @@
+/*
+ * Copyright (C) 2015 Jared Boone, ShareBrained Technology, Inc.
+ *
+ * This file is part of PortaPack.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#include "temperature_logger.hpp"
+
+#include "radio.hpp"
+
+#include <algorithm>
+
+void TemperatureLogger::second_tick() {
+	sample_phase++;
+	if( sample_phase >= sample_interval ) {
+		push_sample(read_sample());
+	}
+}
+
+size_t TemperatureLogger::size() const {
+	return std::min(samples.size(), samples_count);
+}
+
+std::vector<TemperatureLogger::sample_t> TemperatureLogger::history() const {
+	std::vector<sample_t> result;
+
+	const auto n = size();
+	result.resize(n);
+	
+	// Copy the last N samples from the buffer, since new samples are added at the end.
+	std::copy(samples.cend() - n, samples.cend(), result.data());
+	
+	return result;
+}
+
+TemperatureLogger::sample_t TemperatureLogger::read_sample() {
+	// MAX2837 does not return a valid temperature if in "shutdown" mode.
+	return radio::second_if.temp_sense() & 0x1f;
+}
+
+void TemperatureLogger::push_sample(const TemperatureLogger::sample_t sample) {
+	// Started out building a pseudo-FIFO, then got lazy.
+
+	// Shift samples: samples[1:] -> samples[0:-1]
+	// New sample goes into samples[-1]
+	std::copy(samples.cbegin() + 1, samples.cend(), samples.begin());
+	samples.back() = sample;
+	samples_count++;
+	sample_phase = 0;
+}
diff --git a/firmware/application/temperature_logger.hpp b/firmware/application/temperature_logger.hpp
new file mode 100644
index 00000000..5095c338
--- /dev/null
+++ b/firmware/application/temperature_logger.hpp
@@ -0,0 +1,51 @@
+/*
+ * Copyright (C) 2015 Jared Boone, ShareBrained Technology, Inc.
+ *
+ * This file is part of PortaPack.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifndef __TEMPERATURE_LOGGER_H__
+#define __TEMPERATURE_LOGGER_H__
+
+#include <cstddef>
+#include <cstdint>
+#include <array>
+#include <vector>
+
+class TemperatureLogger {
+public:	
+	using sample_t = uint8_t;
+
+	void second_tick();
+
+	size_t size() const;
+
+	std::vector<sample_t> history() const;
+
+private:
+	std::array<sample_t, 128> samples;
+
+	static constexpr size_t sample_interval = 5;
+	size_t sample_phase = 0;
+	size_t samples_count = 0;
+
+	sample_t read_sample();
+	void push_sample(const sample_t sample);
+};
+
+#endif/*__TEMPERATURE_LOGGER_H__*/
diff --git a/firmware/application/ui_debug.cpp b/firmware/application/ui_debug.cpp
index 7e955b03..1622287f 100644
--- a/firmware/application/ui_debug.cpp
+++ b/firmware/application/ui_debug.cpp
@@ -57,6 +57,50 @@ void DebugMemoryView::focus() {
 	button_done.focus();
 }
 
+/* TemperatureWidget *****************************************************/
+
+void TemperatureWidget::paint(Painter& painter) {
+	const auto history = portapack::temperature_logger.history();
+
+	const auto rect = screen_rect();
+
+	for(size_t i=0; i<history.size(); i++) {
+		const auto sample = history[i];
+		const Dim bar_height = sample * 4;
+		const Rect bar_rect {
+			static_cast<Coord>(rect.right() - (history.size() - i) * 1),
+			static_cast<Coord>(rect.bottom() - bar_height),
+			1, bar_height
+		};
+		painter.fill_rectangle(bar_rect, Color::green());
+	}
+
+	if( !history.empty() ) {
+		const int32_t temp = -45 + history.back() * 5;
+		const size_t temp_len = 3;
+		painter.draw_string(
+			{ static_cast<Coord>(rect.right() - (temp_len * 8)), rect.top() },
+			style(),
+			to_string_dec_int(temp, temp_len)
+		);
+	}
+}
+
+/* TemperatureView *******************************************************/
+
+TemperatureView::TemperatureView(NavigationView& nav) {
+	add_children({ {
+		&temperature_widget,
+		&button_done,
+	} });
+
+	button_done.on_select = [&nav](Button&){ nav.pop(); };
+}
+
+void TemperatureView::focus() {
+	button_done.focus();
+}
+
 /* RegistersWidget *******************************************************/
 
 RegistersWidget::RegistersWidget(
@@ -80,6 +124,8 @@ void RegistersWidget::paint(Painter& painter) {
 }
 
 void RegistersWidget::draw_legend(const Coord left, Painter& painter) {
+	const auto pos = screen_pos();
+
 	for(size_t i=0; i<config.registers_count; i+=config.registers_per_row) {
 		const Point offset {
 			left, static_cast<Coord>((i / config.registers_per_row) * row_height)
@@ -87,7 +133,7 @@ void RegistersWidget::draw_legend(const Coord left, Painter& painter) {
 
 		const auto text = to_string_hex(i, config.legend_length);
 		painter.draw_string(
-			screen_pos() + offset,
+			pos + offset,
 			style().invert(),
 			text
 		);
@@ -98,6 +144,8 @@ void RegistersWidget::draw_values(
 	const Coord left,
 	Painter& painter
 ) {
+	const auto pos = screen_pos();
+
 	for(size_t i=0; i<config.registers_count; i++) {
 		const Point offset = {
 			static_cast<Coord>(left + config.legend_width() + 8 + (i % config.registers_per_row) * (config.value_width() + 8)),
@@ -108,7 +156,7 @@ void RegistersWidget::draw_values(
 
 		const auto text = to_string_hex(value, config.value_length);
 		painter.draw_string(
-			screen_pos() + offset,
+			pos + offset,
 			style(),
 			text
 		);
@@ -152,7 +200,7 @@ void RegistersView::focus() {
 /* DebugMenuView *********************************************************/
 
 DebugMenuView::DebugMenuView(NavigationView& nav) {
-	add_items<7>({ {
+	add_items<8>({ {
 		{ "Memory",      [&nav](){ nav.push<DebugMemoryView>(); } },
 		{ "Radio State", [&nav](){ nav.push<NotImplementedView>(); } },
 		{ "SD Card",     [&nav](){ nav.push<NotImplementedView>(); } },
@@ -172,6 +220,7 @@ DebugMenuView::DebugMenuView(NavigationView& nav) {
 			"WM8731", RegistersWidgetConfig { wolfson::wm8731::reg_count, 1, 3, 4 },
 			[](const size_t register_number) { return portapack::audio_codec.read(register_number); }
 		); } },
+		{ "Temperature", [&nav](){ nav.push<TemperatureView>(); } },
 	} });
 	on_left = [&nav](){ nav.pop(); };
 }
diff --git a/firmware/application/ui_debug.hpp b/firmware/application/ui_debug.hpp
index 6ed9b4e9..cfd7f7ad 100644
--- a/firmware/application/ui_debug.hpp
+++ b/firmware/application/ui_debug.hpp
@@ -82,6 +82,36 @@ private:
 	};
 };
 
+class TemperatureWidget : public Widget {
+public:
+	explicit constexpr TemperatureWidget(
+		Rect parent_rect
+	) : Widget { parent_rect }
+	{
+	}
+
+	void paint(Painter& painter) override;
+
+private:
+};
+
+class TemperatureView : public View {
+public:
+	explicit TemperatureView(NavigationView& nav);
+
+	void focus() override;
+
+private:
+	TemperatureWidget temperature_widget {
+		{ 0, 16, 240, 192 },
+	};
+
+	Button button_done {
+		{ 72, 256, 96, 24 },
+		"Done"
+	};
+};
+
 struct RegistersWidgetConfig {
 	size_t registers_count;
 	size_t legend_length;