diff --git a/app/javascript/mastodon/actions/announcements.js b/app/javascript/mastodon/actions/announcements.js
index 7657b05dc42..4f2616e835d 100644
--- a/app/javascript/mastodon/actions/announcements.js
+++ b/app/javascript/mastodon/actions/announcements.js
@@ -23,6 +23,8 @@ export const ANNOUNCEMENTS_REACTION_REMOVE_FAIL    = 'ANNOUNCEMENTS_REACTION_REM
 export const ANNOUNCEMENTS_REACTION_UPDATE = 'ANNOUNCEMENTS_REACTION_UPDATE';
 
 export const ANNOUNCEMENTS_TOGGLE_SHOW = 'ANNOUNCEMENTS_TOGGLE_SHOW';
+export const ANNOUNCEMENTS_SHOW = 'ANNOUNCEMENTS_TOGGLE_SHOW';
+export const ANNOUNCEMENTS_HIDE = 'ANNOUNCEMENTS_TOGGLE_SHOW';
 
 const noOp = () => {};
 
@@ -175,6 +177,14 @@ export const toggleShowAnnouncements = () => ({
   type: ANNOUNCEMENTS_TOGGLE_SHOW,
 });
 
+export const hideAnnouncements = () => ({
+  type: ANNOUNCEMENTS_HIDE,
+});
+
+export const showAnnouncements = () => ({
+  type: ANNOUNCEMENTS_SHOW,
+});
+
 export const deleteAnnouncement = id => ({
   type: ANNOUNCEMENTS_DELETE,
   id,
diff --git a/app/javascript/mastodon/features/announcements/announcement.tsx b/app/javascript/mastodon/features/announcements/announcement.tsx
index 75be0ffe1b4..246dec6c750 100644
--- a/app/javascript/mastodon/features/announcements/announcement.tsx
+++ b/app/javascript/mastodon/features/announcements/announcement.tsx
@@ -57,6 +57,7 @@ export const Announcement: FC<AnnouncementProps> = ({
         <span>
           {' · '}
           <Timestamp announcement={announcement} />
+          {!isVisuallyRead && <span className='announcements__unread' />}
         </span>
       </strong>
 
@@ -67,8 +68,6 @@ export const Announcement: FC<AnnouncementProps> = ({
       />
 
       <ReactionsBar reactions={announcement.reactions} id={announcement.id} />
-
-      {!isVisuallyRead && <span className='announcements__unread' />}
     </AnimateEmojiProvider>
   );
 };
diff --git a/app/javascript/mastodon/features/announcements/hooks.ts b/app/javascript/mastodon/features/announcements/hooks.ts
index ec9884bb611..88ba7b7b6d4 100644
--- a/app/javascript/mastodon/features/announcements/hooks.ts
+++ b/app/javascript/mastodon/features/announcements/hooks.ts
@@ -1,19 +1,19 @@
-import { useEffect, useState } from 'react';
+import { useEffect } from 'react';
 
 import type {
   List as ImmutableList,
   Record as ImmutableRecord,
 } from 'immutable';
 
-import { fetchAnnouncements } from '@/mastodon/actions/announcements';
+import {
+  fetchAnnouncements,
+  showAnnouncements,
+} from '@/mastodon/actions/announcements';
+import type { ApiAnnouncementJSON } from '@/mastodon/api_types/announcements';
 import { useAppDispatch, useAppSelector } from '@/mastodon/store';
+import { isRedesignEnabled } from '@/mastodon/utils/environment';
 
-type AnnouncementItem = ImmutableRecord<{
-  id: string;
-  starts_at: string;
-  published_at: string;
-  read: boolean;
-}>;
+type AnnouncementItem = ImmutableRecord<ApiAnnouncementJSON>;
 
 type AnnouncementsState = ImmutableRecord<{
   items: ImmutableList<AnnouncementItem>;
@@ -39,17 +39,11 @@ export function useHasAnnouncements({
   );
   const hasUnreadAnnouncements = !!unreadAnnouncementCount;
 
-  // Announcements display is transient – it's toggled on when
-  // there are unread announcements or the `show` Redux state is
-  // enabled, but resets to hidden when the page is left (by virtue
-  // of React simply losing this state).
-  const [showAnnouncements, setShowAnnouncements] = useState(false);
-  if (
-    (hasUnreadAnnouncements || shouldShowAnnouncements) &&
-    !showAnnouncements
-  ) {
-    setShowAnnouncements(true);
-  }
+  useEffect(() => {
+    if (hasUnreadAnnouncements && isRedesignEnabled()) {
+      dispatch(showAnnouncements());
+    }
+  }, [hasUnreadAnnouncements, dispatch]);
 
   useEffect(() => {
     const timeout = setTimeout(() => {
@@ -66,7 +60,7 @@ export function useHasAnnouncements({
   return {
     hasAnnouncements,
     hasUnreadAnnouncements,
-    showAnnouncements,
+    shouldShowAnnouncements,
     unreadAnnouncementCount,
   };
 }
diff --git a/app/javascript/mastodon/features/announcements/index.tsx b/app/javascript/mastodon/features/announcements/index.tsx
index 2e4cc0214c4..efe85bc3d11 100644
--- a/app/javascript/mastodon/features/announcements/index.tsx
+++ b/app/javascript/mastodon/features/announcements/index.tsx
@@ -1,15 +1,26 @@
 import { useCallback } from 'react';
 import type { FC } from 'react';
 
+import { FormattedMessage } from 'react-intl';
+
 import type { Map, List } from 'immutable';
 
+import { XIcon } from '@phosphor-icons/react';
+
 import elephantUIPlane from '@/images/elephant_ui_plane.svg';
+import { hideAnnouncements } from '@/mastodon/actions/announcements';
+import { IconButton } from '@/mastodon/components/button/redesign';
 import type { RenderSlideFn } from '@/mastodon/components/carousel';
 import { Carousel } from '@/mastodon/components/carousel';
 import { CustomEmojiProvider } from '@/mastodon/components/emoji/context';
 import { useCustomEmojis } from '@/mastodon/hooks/useCustomEmojis';
 import { mascot } from '@/mastodon/initial_state';
-import { createAppSelector, useAppSelector } from '@/mastodon/store';
+import {
+  createAppSelector,
+  useAppDispatch,
+  useAppSelector,
+} from '@/mastodon/store';
+import { isRedesignEnabled } from '@/mastodon/utils/environment';
 
 import type { IAnnouncement } from './announcement';
 import { Announcement } from './announcement';
@@ -23,9 +34,14 @@ const announcementSelector = createAppSelector(
 );
 
 export const Announcements: FC = () => {
+  const dispatch = useAppDispatch();
   const announcements = useAppSelector(announcementSelector);
   const emojis = useCustomEmojis();
 
+  const closeAnnouncements = useCallback(() => {
+    dispatch(hideAnnouncements());
+  }, [dispatch]);
+
   const renderSlide: RenderSlideFn<{
     id: string;
     announcement: IAnnouncement;
@@ -53,6 +69,18 @@ export const Announcements: FC = () => {
         src={mascot ?? elephantUIPlane}
       />
 
+      {isRedesignEnabled() && (
+        <IconButton
+          icon={XIcon}
+          onClick={closeAnnouncements}
+          size='sm'
+          variant='ghost'
+          className='announcements__close-button'
+        >
+          <FormattedMessage id='lightbox.close' defaultMessage='Close' />
+        </IconButton>
+      )}
+
       <CustomEmojiProvider emojis={emojis}>
         <Carousel
           classNamePrefix='announcements'
diff --git a/app/javascript/mastodon/features/notifications/components/show_announcements_button.tsx b/app/javascript/mastodon/features/notifications/components/show_announcements_button.tsx
index 49cec4925dd..4bf7661f0ff 100644
--- a/app/javascript/mastodon/features/notifications/components/show_announcements_button.tsx
+++ b/app/javascript/mastodon/features/notifications/components/show_announcements_button.tsx
@@ -4,7 +4,7 @@ import { FormattedMessage } from 'react-intl';
 
 import { NewspaperIcon } from '@phosphor-icons/react';
 
-import { toggleShowAnnouncements } from '@/mastodon/actions/announcements';
+import { showAnnouncements } from '@/mastodon/actions/announcements';
 import { closeModal } from '@/mastodon/actions/modal';
 import { Button } from '@/mastodon/components/button/redesign';
 import { useAppDispatch } from '@/mastodon/store';
@@ -14,18 +14,18 @@ import { useHasAnnouncements } from '../../announcements/hooks';
 
 export const ShowAnnouncementsButton: React.FC = () => {
   const dispatch = useAppDispatch();
-  const { hasAnnouncements, showAnnouncements } = useHasAnnouncements({
+  const { hasAnnouncements, shouldShowAnnouncements } = useHasAnnouncements({
     fetch: false,
   });
 
   const handleClick = useCallback(() => {
-    dispatch(toggleShowAnnouncements());
+    dispatch(showAnnouncements());
     dispatch(
       closeModal({ modalType: 'NOTIFICATION_SETTINGS', ignoreFocus: false }),
     );
   }, [dispatch]);
 
-  if (!isRedesignEnabled() || !hasAnnouncements || showAnnouncements) {
+  if (!isRedesignEnabled() || !hasAnnouncements || shouldShowAnnouncements) {
     return null;
   }
 
diff --git a/app/javascript/mastodon/features/notifications_v2/index.tsx b/app/javascript/mastodon/features/notifications_v2/index.tsx
index d524c408bbf..024fd4b44fb 100644
--- a/app/javascript/mastodon/features/notifications_v2/index.tsx
+++ b/app/javascript/mastodon/features/notifications_v2/index.tsx
@@ -222,12 +222,12 @@ export const Notifications: React.FC<{
     );
   }, [notifications, isLoading, hasMore, lastReadId, handleLoadGap]);
 
-  const { showAnnouncements } = useHasAnnouncements();
+  const { shouldShowAnnouncements } = useHasAnnouncements();
 
   const prepend = (
     <>
       {needsNotificationPermission && <NotificationsPermissionBanner />}
-      {showAnnouncements && <Announcements />}
+      {shouldShowAnnouncements && <Announcements />}
       <FilteredNotificationsBanner />
     </>
   );
diff --git a/app/javascript/mastodon/reducers/announcements.js b/app/javascript/mastodon/reducers/announcements.js
index 2134b04c6df..a938c683717 100644
--- a/app/javascript/mastodon/reducers/announcements.js
+++ b/app/javascript/mastodon/reducers/announcements.js
@@ -13,6 +13,8 @@ import {
   ANNOUNCEMENTS_TOGGLE_SHOW,
   ANNOUNCEMENTS_DELETE,
   ANNOUNCEMENTS_DISMISS_SUCCESS,
+  ANNOUNCEMENTS_SHOW,
+  ANNOUNCEMENTS_HIDE,
 } from '../actions/announcements';
 
 const initialState = ImmutableMap({
@@ -64,6 +66,10 @@ export default function announcementsReducer(state = initialState, action) {
     return state.withMutations(map => {
       map.set('show', !map.get('show'));
     });
+  case ANNOUNCEMENTS_SHOW:
+    return state.set('show', true);
+  case ANNOUNCEMENTS_HIDE:
+    return state.set('show', false);
   case ANNOUNCEMENTS_FETCH_REQUEST:
     return state.set('isLoading', true);
   case ANNOUNCEMENTS_FETCH_SUCCESS:
diff --git a/app/javascript/styles/mastodon/components.scss b/app/javascript/styles/mastodon/components.scss
index 6312b33bfb4..0fe1a1cb2c0 100644
--- a/app/javascript/styles/mastodon/components.scss
+++ b/app/javascript/styles/mastodon/components.scss
@@ -8543,6 +8543,13 @@ noscript {
     width: 100%;
   }
 
+  &__close-button {
+    position: absolute;
+    top: var(--space-2);
+    inset-inline-end: var(--space-2);
+    z-index: 1;
+  }
+
   &__root {
     background: var(--color-bg-brand-softest);
     font-size: 13px;
@@ -8584,18 +8591,17 @@ noscript {
     display: block;
     font-weight: 500;
     margin-bottom: 10px;
-    padding-inline-end: 18px;
+    padding-inline-end: 28px;
   }
 
   &__unread {
-    position: absolute;
-    top: 19px;
-    inset-inline-end: 19px;
-    display: block;
-    background: var(--color-text-brand);
-    border-radius: 50%;
+    display: inline-block;
     width: 0.625rem;
     height: 0.625rem;
+    margin-inline-start: 8px;
+    border-radius: 50%;
+    vertical-align: 0.05em;
+    background: var(--color-text-brand);
   }
 
   &__pagination {