現在の苗場山頂は霧雨に包まれ、気温3℃、体感は氷点下の-0.7℃。視界は1km未満と極めて不良な状況にある。この状態では山頂台地の広大な湿原での行動は道迷いのリスクが非常に高い。日中は薄曇りへと移行する予報だが、霧が完全に晴れるかは不透明であり、引き続き視界不良と低温への警戒が必要だ。
気温は漸次上昇し15時には8.1℃に達する見込みだが、湿度が高く霧雨で濡れると体温は奪われやすい。低体温症のリスクに十分注意し、防水透湿性の雨具上下、防水手袋、帽子は必須装備とする。ベースレイヤーは吸湿速乾性、ミッドレイヤーはフリースや薄手ダウンを重ね着し、休憩時には積極的に保温に努めること。
地面は霧雨と高い湿度によりウェット、泥濘が予想される。特に湿原内の木道周辺は滑りやすく、植生保護と安全のため木道外への踏み込みは厳禁だ。視界不良時は台地での濃霧道迷いのリスクが高まるため、GPSと地図で現在地を頻繁に確認し、ルートを外れないよう細心の注意を払うこと。午後は風も弱まり、夜間は晴れ間が広がる見込みだが、気温は日中より下がるため夜間の行動も引き続き防寒対策を怠らないこと。
新潟県・長野県
苗場山
Mt. Naeba
2026年5月24日 06:56 更新
苗場山頂台地は霧。湿潤と低温に警戒を
Summit plateau obscured by fog. Wet, cold conditions. Navigate with caution.
現在の気象状況 — Current Conditions
▲ 山頂エリア (Summit)
気温 Temp
+3°C
風速 Wind
3.6m/s
SSE
天候 Weather
🌦️ 霧雨
体感 Feels Like
-0.7°C
▼ 登山口・山麓エリア (Base)
気温 Temp
+9.8°C
風速 Wind
4.2m/s
S
天候 Weather
🌦️ 霧雨
標高 Altitude
1,006m
山頂の3時間予報 — Summit Forecast
09:00
+5°C
3.2m/s
SSE
💧 0mm
(59%)
12:00
+7°C
2.2m/s
S
💧 0mm
(35%)
15:00
+8°C
1.7m/s
S
💧 0mm
(45%)
18:00
+6°C
1.8m/s
S
💧 0mm
(63%)
21:00
+5°C
2m/s
S
💧 0mm
(27%)
00:00
+5°C
1.7m/s
S
💧 0mm
(4%)
03:00
+5°C
0.3m/s
N
💧 0mm
(0%)
気象分析 — Analysis Report
日本語
コンディション概ね良好 — 通常の山岳安全対策を実施すること
English
Conditions generally good — Conduct standard mountain safety measures
Naeba Summit is currently enveloped in drizzle and fog, with a temperature of 3 degrees Celsius and a wind chill of -0.7 degrees Celsius. Visibility is extremely poor, less than 1 kilometer. Under these conditions, navigating the expansive wetland of the summit plateau carries a very high risk of getting lost. While the forecast indicates a transition to partly cloudy skies during the day, it is uncertain if the fog will completely clear, necessitating continued vigilance against poor visibility and low temperatures.
Although temperatures are expected to gradually rise to 8.1 degrees Celsius by 3 PM, high humidity and potential for getting wet from drizzle can rapidly deplete body heat. Be highly aware of the risk of hypothermia. Essential gear includes waterproof and breathable rainwear (jacket and pants), waterproof gloves, and a hat. Wear moisture-wicking base layers and insulating mid-layers like fleece or light down, actively maintaining warmth during breaks.
The ground is anticipated to be wet and muddy due to the drizzle and high humidity. The wooden boardwalks within the wetland can be slippery, and stepping off them is strictly prohibited for both safety and environmental protection of the delicate vegetation. When visibility is poor, the risk of getting lost in dense fog on the plateau increases significantly, so frequently confirm your current position with a GPS and map to avoid straying from the route. Winds are expected to calm in the afternoon, with clear skies predicted for the night, but temperatures will drop again after sunset, so continue to prioritize cold weather protection for any evening activities.
Although temperatures are expected to gradually rise to 8.1 degrees Celsius by 3 PM, high humidity and potential for getting wet from drizzle can rapidly deplete body heat. Be highly aware of the risk of hypothermia. Essential gear includes waterproof and breathable rainwear (jacket and pants), waterproof gloves, and a hat. Wear moisture-wicking base layers and insulating mid-layers like fleece or light down, actively maintaining warmth during breaks.
The ground is anticipated to be wet and muddy due to the drizzle and high humidity. The wooden boardwalks within the wetland can be slippery, and stepping off them is strictly prohibited for both safety and environmental protection of the delicate vegetation. When visibility is poor, the risk of getting lost in dense fog on the plateau increases significantly, so frequently confirm your current position with a GPS and map to avoid straying from the route. Winds are expected to calm in the afternoon, with clear skies predicted for the night, but temperatures will drop again after sunset, so continue to prioritize cold weather protection for any evening activities.
山岳ガイド — Mountain Guide
概要 Overview
新潟県と長野県の県境に位置する標高2,145mの百名山。山頂部に広がる「苗場(なえば)」と呼ばれる広大な高層湿原が独特の山容を生み出している、信越国境の名峰。
特徴・地形 Features
山頂台地は東西4km・南北約2kmの広大な湿原で、夏は池塘と湿原植物のお花畑が広がる。古来より神聖視され、修験道の対象とされてきた。
ベストシーズン Best Season
7月〜10月上旬。湿原のお花畑ピークは7月下旬〜8月。紅葉は10月初旬。
主要ルート Main Routes
祓川コース(最一般的・かぐら和田小屋)、小赤沢コース、ドラゴンドラ利用コース。
注意点・危険箇所 Cautions
山頂台地は道迷いリスクが高く濃霧時は要注意。湿原内の木道外への踏み込み禁止(植生保護)。
アクセス Access
上越新幹線越後湯沢駅から車・バス。祓川駐車場・小赤沢登山口へ。
※ 本ガイド情報は一般的な参考資料であり、最新の登山道状況・規制情報は各自治体・登山口の公式情報をご確認ください。