diff --git a/ts/graphs/CalendarGraph.svelte b/ts/graphs/CalendarGraph.svelte
index 059668333..c11606c09 100644
--- a/ts/graphs/CalendarGraph.svelte
+++ b/ts/graphs/CalendarGraph.svelte
@@ -74,6 +74,7 @@
     </div>
 
     <svg bind:this={svg} viewBox={`0 0 ${bounds.width} ${bounds.height}`}>
+        <g class="weekdays" />
         <g class="days" />
         <AxisTicks {bounds} />
         <NoDataOverlay {bounds} {i18n} />
diff --git a/ts/graphs/calendar.ts b/ts/graphs/calendar.ts
index a5b1deb23..49069b320 100644
--- a/ts/graphs/calendar.ts
+++ b/ts/graphs/calendar.ts
@@ -28,6 +28,7 @@ export interface GraphData {
     // indexed by day, where day is relative to today
     reviewCount: Map<number, number>;
     timeFunction: CountableTimeInterval;
+    weekdayLabels: number[];
 }
 
 interface DayDatum {
@@ -63,7 +64,12 @@ export function gatherData(data: pb.BackendProto.GraphsOut): GraphData {
             ? timeSaturday
             : timeSunday;
 
-    return { reviewCount, timeFunction };
+    const weekdayLabels: number[] = [];
+    for (let i = 0; i < 7; i++) {
+        weekdayLabels.push((data.firstWeekday + i) % 7);
+    }
+
+    return { reviewCount, timeFunction, weekdayLabels };
 }
 
 export function renderCalendar(
@@ -82,7 +88,8 @@ export function renderCalendar(
 
     const x = scaleLinear()
         .range([bounds.marginLeft, bounds.width - bounds.marginRight])
-        .domain([0, 53]);
+        .domain([-1, 53]);
+
     // map of 0-365 -> day
     const dayMap: Map<number, DayDatum> = new Map();
     let maxCount = 0;
@@ -153,20 +160,31 @@ export function renderCalendar(
     }
 
     const height = bounds.height / 10;
-    let emptyColour = "#ddd";
-    if (nightMode) {
-        emptyColour = "#333";
-    }
-    svg.select(`g.days`)
+    const emptyColour = nightMode ? "#333" : "#ddd";
+
+    svg.select("g.weekdays")
+        .selectAll("text")
+        .data(sourceData.weekdayLabels)
+        .join("text")
+        .text((d: number) => i18n.weekdayLabel(d))
+        .attr("width", x(-1)! - 2)
+        .attr("height", height - 2)
+        .attr("x", x(1)! - 3)
+        .attr("y", (_d, index) => bounds.marginTop + index * height)
+        .attr("dominant-baseline", "hanging")
+        .attr("text-anchor", "end")
+        .attr("font-size", "small")
+        .attr("font-family", "monospace")
+        .style("user-select", "none");
+
+    svg.select("g.days")
         .selectAll("rect")
         .data(data)
         .join("rect")
         .attr("fill", emptyColour)
-        .attr("width", (d) => {
-            return x(d.weekNumber + 1)! - x(d.weekNumber)! - 2;
-        })
+        .attr("width", (d) => x(d.weekNumber + 1)! - x(d.weekNumber)! - 2)
         .attr("height", height - 2)
-        .attr("x", (d) => x(d.weekNumber)!)
+        .attr("x", (d) => x(d.weekNumber + 1)!)
         .attr("y", (d) => bounds.marginTop + d.weekDay * height)
         .on("mousemove", function (this: any, d: any) {
             const [x, y] = mouse(document.body);
diff --git a/ts/lib/i18n.ts b/ts/lib/i18n.ts
index 443c9c687..7210196ed 100644
--- a/ts/lib/i18n.ts
+++ b/ts/lib/i18n.ts
@@ -59,6 +59,13 @@ export class I18n {
         }
     }
 
+    weekdayLabel(n: number): string {
+        const firstLang = this.bundles[0].locales[0];
+        return new Date(86_400_000 * (3 + n)).toLocaleDateString(firstLang, {
+            weekday: "narrow",
+        });
+    }
+
     private keyName(msg: pb.FluentProto.FluentString): string {
         return this.TR[msg].toLowerCase().replace(/_/g, "-");
     }