diff --git a/resources/celerity/map.php b/resources/celerity/map.php
index 4c3c1b87ac..1b82da2ae9 100644
--- a/resources/celerity/map.php
+++ b/resources/celerity/map.php
@@ -122,7 +122,7 @@ return array(
     'rsrc/css/layout/phabricator-source-code-view.css' => '2ceee894',
     'rsrc/css/phui/calendar/phui-calendar-day.css' => '3b4a65d8',
     'rsrc/css/phui/calendar/phui-calendar-list.css' => '840baa8d',
-    'rsrc/css/phui/calendar/phui-calendar-month.css' => '9fde32d1',
+    'rsrc/css/phui/calendar/phui-calendar-month.css' => '7819a8b1',
     'rsrc/css/phui/calendar/phui-calendar.css' => '8345be98',
     'rsrc/css/phui/phui-action-header-view.css' => '89c497e7',
     'rsrc/css/phui/phui-action-list.css' => '4f4d09f2',
@@ -763,7 +763,7 @@ return array(
     'phui-calendar-css' => '8345be98',
     'phui-calendar-day-css' => '3b4a65d8',
     'phui-calendar-list-css' => '840baa8d',
-    'phui-calendar-month-css' => '9fde32d1',
+    'phui-calendar-month-css' => '7819a8b1',
     'phui-crumbs-view-css' => '594d719e',
     'phui-document-view-css' => '94d5dcd8',
     'phui-feed-story-css' => 'c9f3a0b5',
diff --git a/src/view/phui/calendar/PHUICalendarMonthView.php b/src/view/phui/calendar/PHUICalendarMonthView.php
index 80fe049dc3..16e58e3203 100644
--- a/src/view/phui/calendar/PHUICalendarMonthView.php
+++ b/src/view/phui/calendar/PHUICalendarMonthView.php
@@ -294,17 +294,21 @@ final class PHUICalendarMonthView extends AphrontView {
       'tr',
       array('class' => 'phui-calendar-day-of-week-header'),
       array(
-        $this->getDayHeader(pht('Sun'), pht('Sunday')),
+        $this->getDayHeader(pht('Sun'), pht('Sunday'), true),
         $this->getDayHeader(pht('Mon'), pht('Monday')),
         $this->getDayHeader(pht('Tue'), pht('Tuesday')),
         $this->getDayHeader(pht('Wed'), pht('Wednesday')),
         $this->getDayHeader(pht('Thu'), pht('Thursday')),
         $this->getDayHeader(pht('Fri'), pht('Friday')),
-        $this->getDayHeader(pht('Sat'), pht('Saturday')),
+        $this->getDayHeader(pht('Sat'), pht('Saturday'), true),
       ));
   }
 
-  private function getDayHeader($short, $long) {
+  private function getDayHeader($short, $long, $is_weekend = false) {
+    $class = null;
+    if ($is_weekend) {
+      $class = 'weekend-day-header';
+    }
     $day = array();
     $day[] = phutil_tag(
       'span',
@@ -320,7 +324,9 @@ final class PHUICalendarMonthView extends AphrontView {
       $short);
     return phutil_tag(
       'th',
-      array(),
+      array(
+        'class' => $class,
+      ),
       $day);
   }
 
diff --git a/webroot/rsrc/css/phui/calendar/phui-calendar-month.css b/webroot/rsrc/css/phui/calendar/phui-calendar-month.css
index cd7a0e4712..ba268f332f 100644
--- a/webroot/rsrc/css/phui/calendar/phui-calendar-month.css
+++ b/webroot/rsrc/css/phui/calendar/phui-calendar-month.css
@@ -16,6 +16,10 @@ tr.phui-calendar-day-of-week-header th {
   background: {$lightgreybackground};
 }
 
+tr.phui-calendar-day-of-week-header th.weekend-day-header {
+  background: {$greybackground};
+}
+
 .device tr.phui-calendar-day-of-week-header th .long-weekday-name {
   display: none;
 }