diff --git a/backend/.env.example b/backend/.env.example
index 873a935..93093bd 100644
--- a/backend/.env.example
+++ b/backend/.env.example
@@ -6,9 +6,12 @@ OPENAI_API_KEY=sk-...
 ANTHROPIC_API_KEY=sk-ant-...
 # Ollama (ローカル) — APIキー不要、モデル名は ollama/llama3 形式で指定
 OLLAMA_API_BASE=http://localhost:11434
-# Amazon Bedrock (API key方式) — モデル名は bedrock/anthropic.claude-3-5-sonnet-20241022-v2:0 形式で指定
-AWS_BEARER_TOKEN_BEDROCK=
+# Amazon Bedrock (IAM経由 — Access Key方式) — モデル名は bedrock/anthropic.claude-3-5-sonnet-20241022-v2:0 形式で指定
+AWS_ACCESS_KEY_ID=
+AWS_SECRET_ACCESS_KEY=
 AWS_REGION_NAME=us-east-1
+# 旧: API key方式（Bearer Token）。IAMを使う場合は不要
+AWS_BEARER_TOKEN_BEDROCK=
 
 # デバッグ (true にすると LiteLLM の詳細ログが出力される)
 DEBUG=false
diff --git a/backend/app/api/system.py b/backend/app/api/system.py
index 8764a66..fc2b07c 100644
--- a/backend/app/api/system.py
+++ b/backend/app/api/system.py
@@ -3,6 +3,7 @@ import psutil
 from pydantic import BaseModel
 
 from app.core.scheduler import send_useless_tip, send_weather_laundry_notification
+from app.core.weather_cache import get_latest as get_latest_weather
 
 router = APIRouter(prefix="/api/system", tags=["system"])
 
@@ -61,3 +62,9 @@ async def test_useless_tip():
     """どうでもいいtips→Discord通知を手動で即時実行する（動作確認用）"""
     await send_useless_tip()
     return {"status": "sent"}
+
+
+@router.get("/weather/latest")
+async def get_latest_weather_data():
+    """直近で取得した明日の天気データを返す（未取得ならnull）"""
+    return get_latest_weather()
diff --git a/backend/app/core/config.py b/backend/app/core/config.py
index c8dc468..6b90eec 100644
--- a/backend/app/core/config.py
+++ b/backend/app/core/config.py
@@ -10,8 +10,13 @@ CORS_ORIGINS: list[str] = os.getenv("CORS_ORIGINS", "http://localhost:5173").spl
 DEBUG: bool = os.getenv("DEBUG", "false").lower() in ("1", "true", "yes")
 
 # Amazon Bedrock
-# AWS_BEARER_TOKEN_BEDROCK (API key方式) / AWS_REGION_NAME は
-# LiteLLM が os.environ から直接読み取るため、.env に書くだけで自動的に有効になる
+# 以下はすべて LiteLLM(boto3) が os.environ から直接読み取るため、.env に書くだけで自動的に有効になる。
+# IAM経由（推奨）: AWS_ACCESS_KEY_ID / AWS_SECRET_ACCESS_KEY を設定する。
+# API key方式（旧）: AWS_BEARER_TOKEN_BEDROCK のみを設定する。
+# 両方設定されている場合はIAM認証（Access Key）が優先される。
+AWS_ACCESS_KEY_ID: str | None = os.getenv("AWS_ACCESS_KEY_ID")
+AWS_SECRET_ACCESS_KEY: str | None = os.getenv("AWS_SECRET_ACCESS_KEY")
+AWS_SESSION_TOKEN: str | None = os.getenv("AWS_SESSION_TOKEN")  # 一時的なIAMクレデンシャルを使う場合のみ
 AWS_BEARER_TOKEN_BEDROCK: str | None = os.getenv("AWS_BEARER_TOKEN_BEDROCK")
 AWS_REGION_NAME: str = os.getenv("AWS_REGION_NAME", "us-east-1")
 
diff --git a/backend/app/core/discord_bot.py b/backend/app/core/discord_bot.py
index 39bfe81..b4cbe8a 100644
--- a/backend/app/core/discord_bot.py
+++ b/backend/app/core/discord_bot.py
@@ -11,7 +11,9 @@ from app.core.config import (
     WEATHER_NOTIFY_MODEL,
 )
 from app.core.llm import complete
+from app.core.scheduler import send_useless_tip
 from app.core.weather import fetch_tomorrow_weather, judge_laundry
+from app.core.weather_cache import set_latest
 
 logger = logging.getLogger(__name__)
 
@@ -21,6 +23,7 @@ intents.message_content = True
 client = discord.Client(intents=intents)
 
 WEATHER_KEYWORDS = ("天気", "天候", "洗濯", "雨", "気温", "降水")
+USELESS_TALK_KEYWORDS = ("どうでもいい", "雑談", "暇", "つまんない", "退屈")
 
 
 async def _build_weather_context() -> str:
@@ -29,6 +32,7 @@ async def _build_weather_context() -> str:
         weather_data = await fetch_tomorrow_weather(WEATHER_AREA_CODE, WEATHER_AREA_KEYWORD)
         judgement, reason = judge_laundry(weather_data["weather"], weather_data["pop"])
         pop_text = f"{weather_data['pop']}%" if weather_data["pop"] is not None else "不明"
+        set_latest(weather_data["weather"], weather_data["pop"], judgement, reason)
         return (
             "【明日の天気予報データ（気象庁発表）】\n"
             f"天気: {weather_data['weather']}\n"
@@ -59,6 +63,12 @@ async def on_message(message: discord.Message):
 
     async with message.channel.typing():
         try:
+            if any(keyword in content for keyword in USELESS_TALK_KEYWORDS):
+                redirect = await _generate_useless_talk_redirect(content)
+                await message.reply(redirect)
+                await send_useless_tip()
+                return
+
             messages = [{"role": "system", "content": DISCORD_BOT_SYSTEM_PROMPT}]
 
             if any(keyword in content for keyword in WEATHER_KEYWORDS):
@@ -74,6 +84,27 @@ async def on_message(message: discord.Message):
             await message.reply("⚠️ 応答の生成に失敗しました")
 
 
+async def _generate_useless_talk_redirect(content: str) -> str:
+    """どうでもいい話を振られたとき、『どうでもいいTips』チャンネルへ誘導する一言を生成する。"""
+    fallback = "🤷 雑談なら『どうでもいいTips』チャンネルの出番です！今ちょうど一つ送りますね〜"
+
+    prompt = (
+        "あなたは「お天気アプリ」というDiscord Botです。"
+        "ユーザーがどうでもいい雑談を振ってきました。"
+        "あなたは天気専門なので、雑談は『どうでもいいTips』という別のBot/チャンネルにお任せしたいです。"
+        "そこへ話題を振るような、軽いノリの一言を1〜2文で返してください。"
+        "絵文字を1つ程度使い、出力は本文のみにしてください。\n\n"
+        f"ユーザーの発言: {content}"
+    )
+
+    try:
+        result = await complete([{"role": "user", "content": prompt}], model=WEATHER_NOTIFY_MODEL)
+        return result.strip() or fallback
+    except Exception:
+        logger.exception("Failed to generate useless talk redirect message")
+        return fallback
+
+
 async def start_discord_bot() -> None:
     if not DISCORD_BOT_TOKEN:
         logger.warning("DISCORD_BOT_TOKEN is not set; Discord bot will not start")
diff --git a/backend/app/core/scheduler.py b/backend/app/core/scheduler.py
index 0d880b3..f20a533 100644
--- a/backend/app/core/scheduler.py
+++ b/backend/app/core/scheduler.py
@@ -22,6 +22,7 @@ from app.core.config import (
 from app.core.llm import complete
 from app.core.notify import send_discord_message
 from app.core.weather import fetch_tomorrow_weather, judge_laundry
+from app.core.weather_cache import set_latest
 
 logger = logging.getLogger(__name__)
 
@@ -37,6 +38,7 @@ async def send_weather_laundry_notification() -> None:
         weather_data = await fetch_tomorrow_weather(WEATHER_AREA_CODE, WEATHER_AREA_KEYWORD)
         judgement, reason = judge_laundry(weather_data["weather"], weather_data["pop"])
         pop_text = f"{weather_data['pop']}%" if weather_data["pop"] is not None else "不明"
+        set_latest(weather_data["weather"], weather_data["pop"], judgement, reason)
 
         content = await _generate_message(weather_data["weather"], pop_text, judgement, reason)
         await send_discord_message(DISCORD_WEBHOOK_URL, content)
diff --git a/backend/app/core/weather_cache.py b/backend/app/core/weather_cache.py
new file mode 100644
index 0000000..44fd12f
--- /dev/null
+++ b/backend/app/core/weather_cache.py
@@ -0,0 +1,19 @@
+"""直近で取得した「明日の天気」データをメモリ上にキャッシュする。"""
+from datetime import datetime
+
+_latest: dict | None = None
+
+
+def set_latest(weather: str, pop: int | None, judgement: str, reason: str) -> None:
+    global _latest
+    _latest = {
+        "weather": weather,
+        "pop": pop,
+        "judgement": judgement,
+        "reason": reason,
+        "fetched_at": datetime.now().isoformat(),
+    }
+
+
+def get_latest() -> dict | None:
+    return _latest
diff --git a/frontend/src/App.vue b/frontend/src/App.vue
index d6fb1b5..7c3a5d8 100644
--- a/frontend/src/App.vue
+++ b/frontend/src/App.vue
@@ -7,6 +7,7 @@ import ModelSelector from './components/ModelSelector.vue'
 import LogViewer from './components/LogViewer.vue'
 import ToastList from './components/ToastList.vue'
 import MemoryMonitor from './components/MemoryMonitor.vue'
+import Clock from './components/Clock.vue'
 
 const showLogs = ref(false)
 </script>
@@ -21,6 +22,7 @@ const showLogs = ref(false)
       <header>
         <span class="title">PlayChat</span>
         <ModelSelector />
+        <Clock />
         <button class="log-toggle" :class="{ active: showLogs }" @click="showLogs = !showLogs">
           ログ
         </button>
diff --git a/frontend/src/components/Clock.vue b/frontend/src/components/Clock.vue
new file mode 100644
index 0000000..f10b4c1
--- /dev/null
+++ b/frontend/src/components/Clock.vue
@@ -0,0 +1,87 @@
+<script setup lang="ts">
+import { ref, onMounted, onUnmounted } from 'vue'
+
+interface LatestWeather {
+  weather: string
+  pop: number | null
+  judgement: string
+  reason: string
+  fetched_at: string
+}
+
+const now = ref(new Date())
+const weather = ref<LatestWeather | null>(null)
+let clockIntervalId: number | null = null
+let weatherIntervalId: number | null = null
+
+const formatDate = (date: Date) => {
+  const weekdays = ['日', '月', '火', '水', '木', '金', '土']
+  return `${date.getFullYear()}/${String(date.getMonth() + 1).padStart(2, '0')}/${String(date.getDate()).padStart(2, '0')} (${weekdays[date.getDay()]})`
+}
+
+const formatTime = (date: Date) => {
+  return `${String(date.getHours()).padStart(2, '0')}:${String(date.getMinutes()).padStart(2, '0')}:${String(date.getSeconds()).padStart(2, '0')}`
+}
+
+const formatFetchedAt = (iso: string) => {
+  const d = new Date(iso)
+  return `${String(d.getHours()).padStart(2, '0')}:${String(d.getMinutes()).padStart(2, '0')}時点`
+}
+
+const fetchWeather = async () => {
+  try {
+    const response = await fetch('/api/system/weather/latest')
+    const data = await response.json()
+    weather.value = data
+  } catch (error) {
+    console.error('Failed to fetch latest weather:', error)
+  }
+}
+
+onMounted(() => {
+  clockIntervalId = window.setInterval(() => {
+    now.value = new Date()
+  }, 1000)
+
+  fetchWeather()
+  weatherIntervalId = window.setInterval(fetchWeather, 60000)
+})
+
+onUnmounted(() => {
+  if (clockIntervalId) clearInterval(clockIntervalId)
+  if (weatherIntervalId) clearInterval(weatherIntervalId)
+})
+</script>
+
+<template>
+  <div class="clock">
+    <span class="date">{{ formatDate(now) }}</span>
+    <span class="time">{{ formatTime(now) }}</span>
+    <span v-if="weather" class="weather" :title="`${formatFetchedAt(weather.fetched_at)}取得`">
+      🌤️ 明日: {{ weather.weather }}
+      <template v-if="weather.pop !== null">（降水{{ weather.pop }}%）</template>
+      ・👕{{ weather.judgement }}
+    </span>
+  </div>
+</template>
+
+<style scoped>
+.clock {
+  display: flex;
+  align-items: baseline;
+  gap: 8px;
+  font-family: monospace;
+  font-size: 13px;
+  color: #aaa;
+}
+.time {
+  color: #eee;
+  font-weight: 600;
+}
+.weather {
+  color: #8bc8ff;
+  font-size: 12px;
+  border-left: 1px solid #444;
+  padding-left: 8px;
+}
+</style>