diff --git a/apps/status/src/static/app.css b/apps/status/src/static/app.css
index 0d6667a..ad05f78 100644
--- a/apps/status/src/static/app.css
+++ b/apps/status/src/static/app.css
@@ -52,7 +52,11 @@ h1 { font-size: 1.75rem; font-weight: 700; margin: 0 0 0.5rem; }
 .group-chev { color: var(--muted); transition: transform 0.15s; flex-shrink: 0; }
 .group-toggle:checked ~ .group-header .group-chev { transform: rotate(90deg); }
 .group-name { font-size: 0.85rem; font-weight: 600; color: var(--fg); }
+.group-header-right { display: flex; align-items: center; gap: 1rem; }
 .group-status { font-size: 0.75rem; font-weight: 600; }
+.group-aggregate { padding: 0 1.25rem 0.75rem; }
+.group-aggregate .bars { height: 24px; }
+.group-toggle:checked ~ .group-aggregate { display: none; }
 .group-body { display: none; padding: 0 0.75rem 0.75rem; }
 .group-toggle:checked ~ .group-body { display: block; }
 .group-body .monitors { gap: 0.35rem; }
diff --git a/apps/status/src/views/page.ejs b/apps/status/src/views/page.ejs
index 6a9c55b..8184b8d 100644
--- a/apps/status/src/views/page.ejs
+++ b/apps/status/src/views/page.ejs
@@ -192,16 +192,45 @@
       const groupStatusLabel = groupStatus === 'up' ? 'Operational' : groupStatus === 'degraded' ? 'Degraded' : groupStatus === 'down' ? 'Down' : '';
       const groupStatusColor = groupStatus === 'up' ? 'var(--bar-up)' : groupStatus === 'degraded' ? 'var(--bar-partial)' : groupStatus === 'down' ? 'var(--bar-down)' : 'var(--muted)';
     %>
-      <% if (groupName) { %>
+      <% if (groupName) {
+        // Aggregate buckets across all monitors in the group (weighted average)
+        const aggBuckets = [];
+        const firstWithBuckets = list.find(m => m.buckets && m.buckets.length > 0);
+        if (firstWithBuckets) {
+          for (let bi = 0; bi < firstWithBuckets.buckets.length; bi++) {
+            let t = 0, u = 0, latSum = 0, latN = 0;
+            for (const m of list) {
+              if (!m.buckets || !m.buckets[bi]) continue;
+              t += m.buckets[bi].total;
+              u += m.buckets[bi].up;
+              if (m.buckets[bi].avg_latency != null) { latSum += m.buckets[bi].avg_latency * m.buckets[bi].total; latN += m.buckets[bi].total; }
+            }
+            aggBuckets.push({ start: firstWithBuckets.buckets[bi].start, total: t, up: u, avg_latency: latN > 0 ? Math.round(latSum / latN) : null });
+          }
+        }
+        const aggTotal = aggBuckets.reduce((a, b) => a + b.total, 0);
+        const aggUp = aggBuckets.reduce((a, b) => a + b.up, 0);
+        const aggPct = aggTotal > 0 ? (100 * aggUp / aggTotal) : null;
+      %>
         <div class="group-section">
-          <input type="checkbox" class="group-toggle" id="g-<%= gi %>" checked>
+          <input type="checkbox" class="group-toggle" id="g-<%= gi %>">
           <label class="group-header" for="g-<%= gi %>">
             <div class="group-header-left">
               <svg class="group-chev" width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><polyline points="9 18 15 12 9 6"/></svg>
               <span class="group-name"><%= groupName %></span>
             </div>
-            <span class="group-status" style="color: <%= groupStatusColor %>;"><%= groupStatusLabel %></span>
+            <div class="group-header-right">
+              <span class="uptime-pct <%= uptimeBand(aggPct) %>"><%= fmtUptime(aggPct) %></span>
+              <span class="group-status" style="color: <%= groupStatusColor %>;"><%= groupStatusLabel %></span>
+            </div>
           </label>
+          <div class="group-aggregate">
+            <div class="bars" aria-label="Group uptime">
+              <% aggBuckets.forEach(function(b) { %>
+                <div class="bar" style="background: <%= bucketColor(b) %>;" data-start="<%= b.start %>" data-total="<%= b.total %>" data-up="<%= b.up %>"<% if (b.avg_latency != null) { %> data-latency="<%= b.avg_latency %>"<% } %>></div>
+              <% }); %>
+            </div>
+          </div>
           <div class="group-body">
       <% } %>
       <div class="monitors">