diff --git a/docs/design.md b/docs/design.md
index 44910064..b9326a48 100644
--- a/docs/design.md
+++ b/docs/design.md
@@ -104,7 +104,7 @@ RSS 来源可以按地点 ID 限定范围，并配置正文清洗规则。`verba
 
 和风天气使用 `QWeatherJWTAuthenticator` 签发短期 JWT。认证输入包括项目 ID、凭据 ID、专属 API Host 和 Base64 编码的 Ed25519 私钥。实现不支持用长期 API Key 代替该流程。
 
-`OpenMeteoProvider` 提供全球天气，并从独立接口读取空气质量和欧洲花粉数据。公开接口适用于非商业使用，没有 SLA；Base URL 和可选 API Key 可以替换。
+`OpenMeteoProvider` 提供全球天气，并从独立接口读取空气质量和欧洲花粉数据。适配器在生成来源正文前把 WMO 天气代码转换为可读的中文天气现象；未知代码保留为“未识别天气现象”并写入安全日志。公开接口适用于非商业使用，没有 SLA；Base URL 和可选 API Key 可以替换。
 
 `AQICNProvider` 只在最终天气结果缺少空气质量时补充当前观测。它不参与未来日期查询，也不把 PM2.5 单项 AQI 换算为浓度。
 
diff --git a/tests/test_reference_data.py b/tests/test_reference_data.py
index b77df472..59d60bf4 100644
--- a/tests/test_reference_data.py
+++ b/tests/test_reference_data.py
@@ -9,6 +9,7 @@
     ReferenceDataError,
     load_reference_data,
     localization_table,
+    open_meteo_weather_code_descriptions,
     reference_string,
     reference_string_tuple,
     reference_value,
@@ -46,6 +47,38 @@ def test_packaged_reference_data_is_available() -> None:
     assert reference_string_tuple("content_cleaning.json", "default_remove_selectors")
     assert reference_string_tuple("provider_defaults.json", "qweather_lifestyle_index_types")
     assert reference_string("provider_defaults.json", "qweather_allergen_index_type") == "7"
+    weather_codes = open_meteo_weather_code_descriptions()
+    assert set(weather_codes) == {
+        0,
+        1,
+        2,
+        3,
+        45,
+        48,
+        51,
+        53,
+        55,
+        56,
+        57,
+        61,
+        63,
+        65,
+        66,
+        67,
+        71,
+        73,
+        75,
+        77,
+        80,
+        81,
+        82,
+        85,
+        86,
+        95,
+        96,
+        99,
+    }
+    assert weather_codes[53] == "中等强度毛毛雨"
     assert localization_table("weather_document")["ja"]["forecast"] == "天気予報"
     assert localization_table("briefing")["zh-Hans"]["weather"] == "天气信息"
     classification = telegram_error_classification()
@@ -53,6 +86,26 @@ def test_packaged_reference_data_is_available() -> None:
     assert classification.status_reasons[401] == "bot-token-rejected"
 
 
+@pytest.mark.parametrize(
+    "value",
+    (
+        {},
+        {"descriptions_zh_CN": {}},
+        {"descriptions_zh_CN": {"unknown": "晴朗"}},
+        {"descriptions_zh_CN": {"00": "晴朗"}},
+        {"descriptions_zh_CN": {"9" * 5_000: "未知"}},
+        {"descriptions_zh_CN": {"0": ""}},
+        {"descriptions_zh_CN": {"0": "晴朗"}, "unknown": {}},
+    ),
+)
+def test_open_meteo_weather_codes_reject_invalid_data(monkeypatch, value) -> None:
+    monkeypatch.setattr("weather_briefing.reference_data.load_reference_data", lambda filename: value)
+    open_meteo_weather_code_descriptions.cache_clear()
+
+    with pytest.raises(ReferenceDataError, match="Open-Meteo weather codes"):
+        open_meteo_weather_code_descriptions()
+
+
 def test_air_quality_guidance_covers_values_above_last_bounded_band() -> None:
     category, guidance = health_guidance(10_000)
 
diff --git a/tests/test_weather_context.py b/tests/test_weather_context.py
index 7c3517db..9a81643d 100644
--- a/tests/test_weather_context.py
+++ b/tests/test_weather_context.py
@@ -27,6 +27,7 @@
     _format_qweather_day,
     _format_qweather_lifestyle,
     _open_meteo_daily_peak_values,
+    _open_meteo_weather_description,
     snapshot_to_documents,
 )
 
@@ -532,7 +533,8 @@ def handler(request: httpx.Request) -> httpx.Response:
         ).fetch(52.52, 13.41)
 
     assert len(snapshot.weather_forecast) == 2
-    assert "WMO天气代码2" in snapshot.weather_forecast[0]
+    assert "局部多云" in snapshot.weather_forecast[0]
+    assert "WMO" not in snapshot.weather_forecast[0]
     assert snapshot.observed_at.to_iso8601_string() == "2026-07-13T08:00:00+02:00"
     assert snapshot.observed_at.timezone_name == "Europe/Berlin"
     assert snapshot.air_quality is not None
@@ -541,6 +543,26 @@ def handler(request: httpx.Request) -> httpx.Response:
     assert snapshot.air_quality.pm25_concentration == 9.5
 
 
+def test_open_meteo_weather_code_uses_readable_description() -> None:
+    assert _open_meteo_weather_description(53) == "中等强度毛毛雨"
+
+
+def test_open_meteo_unknown_weather_code_uses_readable_fallback(caplog) -> None:
+    with caplog.at_level("WARNING", logger="weather_briefing.weather_context"):
+        description = _open_meteo_weather_description(100)
+
+    assert description == "未识别天气现象"
+    assert "Unknown Open-Meteo weather code code=100" in caplog.text
+
+
+def test_open_meteo_invalid_weather_code_uses_readable_fallback(caplog) -> None:
+    with caplog.at_level("WARNING", logger="weather_briefing.weather_context"):
+        description = _open_meteo_weather_description("53")
+
+    assert description == "未识别天气现象"
+    assert "Invalid Open-Meteo weather code value_type=str" in caplog.text
+
+
 async def test_open_meteo_provider_requests_only_selected_future_date() -> None:
     target_date = pendulum.date(2026, 7, 15)
 
diff --git a/weather_briefing/data/open_meteo_weather_codes.json b/weather_briefing/data/open_meteo_weather_codes.json
new file mode 100644
index 00000000..85401122
--- /dev/null
+++ b/weather_briefing/data/open_meteo_weather_codes.json
@@ -0,0 +1,32 @@
+{
+  "descriptions_zh_CN": {
+    "0": "晴朗",
+    "1": "大致晴朗",
+    "2": "局部多云",
+    "3": "阴天",
+    "45": "有雾",
+    "48": "雾凇",
+    "51": "轻微毛毛雨",
+    "53": "中等强度毛毛雨",
+    "55": "强毛毛雨",
+    "56": "轻微冻毛毛雨",
+    "57": "强冻毛毛雨",
+    "61": "小雨",
+    "63": "中雨",
+    "65": "大雨",
+    "66": "轻微冻雨",
+    "67": "强冻雨",
+    "71": "小雪",
+    "73": "中雪",
+    "75": "大雪",
+    "77": "米雪",
+    "80": "轻微阵雨",
+    "81": "中等强度阵雨",
+    "82": "强阵雨",
+    "85": "轻微阵雪",
+    "86": "强阵雪",
+    "95": "雷暴",
+    "96": "雷暴伴轻微冰雹",
+    "99": "雷暴伴强冰雹"
+  }
+}
diff --git a/weather_briefing/reference_data.py b/weather_briefing/reference_data.py
index 365d96d8..8002e2a3 100644
--- a/weather_briefing/reference_data.py
+++ b/weather_briefing/reference_data.py
@@ -142,6 +142,32 @@ def reference_string_tuple(filename: str, *path: str) -> tuple[str, ...]:
     return tuple(value)
 
 
+@cache
+def open_meteo_weather_code_descriptions() -> Mapping[int, str]:
+    """Return validated Chinese descriptions for Open-Meteo WMO weather codes."""
+    value = load_reference_data("open_meteo_weather_codes.json")
+    descriptions = value.get("descriptions_zh_CN")
+    if set(value) != {"descriptions_zh_CN"} or not isinstance(descriptions, dict) or not descriptions:
+        raise ReferenceDataError("Open-Meteo weather codes must contain Chinese descriptions")
+
+    validated: dict[int, str] = {}
+    for code, description in descriptions.items():
+        if (
+            not isinstance(code, str)
+            or not code.isascii()
+            or not code.isdigit()
+            or len(code) > 2
+            or not isinstance(description, str)
+            or not description.strip()
+        ):
+            raise ReferenceDataError("Open-Meteo weather codes must map numeric codes to descriptions")
+        numeric_code = int(code)
+        if str(numeric_code) != code:
+            raise ReferenceDataError("Open-Meteo weather codes must map numeric codes to descriptions")
+        validated[numeric_code] = description
+    return MappingProxyType(validated)
+
+
 @cache
 def telegram_error_classification() -> TelegramErrorClassification:
     """Return validated Telegram API error classification data."""
diff --git a/weather_briefing/weather_context.py b/weather_briefing/weather_context.py
index feaaad97..083a6f37 100644
--- a/weather_briefing/weather_context.py
+++ b/weather_briefing/weather_context.py
@@ -28,7 +28,13 @@
     SourceDocument,
     WeatherContextSnapshot,
 )
-from .reference_data import ReferenceDataError, localization_table, reference_string, reference_string_tuple
+from .reference_data import (
+    ReferenceDataError,
+    localization_table,
+    open_meteo_weather_code_descriptions,
+    reference_string,
+    reference_string_tuple,
+)
 from .time_utils import (
     datetime_timezone_specifier,
     parse_datetime_with_default_timezone,
@@ -1020,7 +1026,7 @@ def _float_value(value: object) -> float:
 def _format_open_meteo_day(daily: dict[str, object], index: int) -> str:
     return (
         f"{_open_meteo_daily_value(daily, 'time', index)}："
-        f"WMO天气代码{_open_meteo_daily_value(daily, 'weather_code', index)}，"
+        f"{_open_meteo_weather_description(_open_meteo_daily_value(daily, 'weather_code', index))}，"
         f"{_open_meteo_daily_value(daily, 'temperature_2m_min', index)}~"
         f"{_open_meteo_daily_value(daily, 'temperature_2m_max', index)}℃，"
         f"体感{_open_meteo_daily_value(daily, 'apparent_temperature_min', index)}~"
@@ -1032,3 +1038,14 @@ def _format_open_meteo_day(daily: dict[str, object], index: int) -> str:
         f"主导风向{_open_meteo_daily_value(daily, 'wind_direction_10m_dominant', index)}°，"
         f"最高紫外线指数{_open_meteo_daily_value(daily, 'uv_index_max', index)}"
     )
+
+
+def _open_meteo_weather_description(value: object) -> str:
+    descriptions = open_meteo_weather_code_descriptions()
+    if type(value) is int and value in descriptions:
+        return descriptions[value]
+    if type(value) is int:
+        _LOGGER.warning("Unknown Open-Meteo weather code code=%d", value)
+    else:
+        _LOGGER.warning("Invalid Open-Meteo weather code value_type=%s", type(value).__name__)
+    return "未识别天气现象"