苗場山頂は快晴、視程20kmを超える穏やかな朝を迎えている。山麓との気温差は7℃あり、山頂は現在6.4℃、体感は3.8℃まで冷え込んでいる。日中は気温が上昇し、正午には10℃、午後3時には10.2℃に達する見込み。風は日中を通して穏やかで、突風でも最大8.3m/s程度に留まる。
今日の苗場山は、山頂台地の広大な湿原散策に最適な一日となる。地面は積雪がなく、登山道は概ねドライだが、高層湿原内の木道は湿っている箇所がある。湿原保護のため、木道外への踏み込みは厳禁とする。体感気温は日中でも6℃から8℃程度となるため、速乾性のベースレイヤーに薄手のフリースやウールの中間着、防風性のアウターシェルを携行し、体温調整をこまめに行うこと。
雷雨の兆候はなく、強風のリスクも低い。低体温症の懸念も適切な装備があれば回避できる。アイゼンやチェーンスパイクは不要。雨具は念のため携行が望ましい。
夕方から夜間にかけては気温が5℃台まで冷え込む。日没後の行動は避け、早めの行動終了を心がけること。
新潟県・長野県
苗場山
Mt. Naeba
2026年5月15日 07:11 更新
苗場山頂穏やか。湿原散策に好適
Clear Skies and Gentle Breezes on Naeba Summit. Ideal for Wetland Exploration.
現在の気象状況 — Current Conditions
▲ 山頂エリア (Summit)
気温 Temp
+6.4°C
風速 Wind
0.6m/s
NW
天候 Weather
☀️ 快晴
体感 Feels Like
+3.8°C
▼ 登山口・山麓エリア (Base)
気温 Temp
+13.4°C
風速 Wind
0.7m/s
N
天候 Weather
☀️ 快晴
標高 Altitude
1,006m
山頂の3時間予報 — Summit Forecast
09:00
+8°C
1.6m/s
NNW
💧 0mm
(0%)
12:00
+10°C
2m/s
N
💧 0mm
(0%)
15:00
+10°C
1.8m/s
NNE
💧 0mm
(8%)
18:00
+7°C
0.7m/s
NE
💧 0mm
(0%)
21:00
+5°C
2.8m/s
SSE
💧 0mm
(0%)
00:00
+4°C
1.5m/s
S
💧 0mm
(0%)
03:00
+4°C
0.6m/s
SSE
💧 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 experiencing a clear and calm morning with visibility exceeding 20 kilometers. The temperature difference from the base is 7℃, with the summit currently at 6.4℃, feeling like 3.8℃ due to a slight chill. Temperatures are expected to rise during the day, reaching 10℃ by noon and 10.2℃ by 3 PM. Winds will remain gentle throughout the day, with gusts peaking at around 8.3 m/s, posing no significant hazard to travel.
Today presents an ideal opportunity for exploring the vast wetlands on Naeba's summit plateau. There is no snow cover, and the general ground condition on hiking trails is dry. However, the wooden boardwalks within the high-altitude wetlands may be damp in certain sections. It is crucial to remember that stepping off these boardwalks is strictly prohibited to preserve the fragile ecosystem of the wetland. Felt temperatures during the day will range from 6℃ to 8℃; therefore, a quick-drying base layer, a light fleece or wool mid-layer, and a windproof outer shell are recommended for effective temperature regulation. Be prepared to add or remove layers as needed.
The forecast shows zero precipitation probability, eliminating the risk of thunderstorms or heavy rain. Wind speeds are well below hazardous levels, and with proper layering, the risk of hypothermia is minimal. Essential gear today includes sturdy hiking boots, and while not strictly necessary, carrying lightweight rain gear is a prudent precaution. Crampons or microspikes are not required given the current conditions.
As evening approaches and transitions into night, temperatures will drop to around 5℃. Plan your descent to avoid being on the mountain after sunset, ensuring a safe and comfortable experience.
Today presents an ideal opportunity for exploring the vast wetlands on Naeba's summit plateau. There is no snow cover, and the general ground condition on hiking trails is dry. However, the wooden boardwalks within the high-altitude wetlands may be damp in certain sections. It is crucial to remember that stepping off these boardwalks is strictly prohibited to preserve the fragile ecosystem of the wetland. Felt temperatures during the day will range from 6℃ to 8℃; therefore, a quick-drying base layer, a light fleece or wool mid-layer, and a windproof outer shell are recommended for effective temperature regulation. Be prepared to add or remove layers as needed.
The forecast shows zero precipitation probability, eliminating the risk of thunderstorms or heavy rain. Wind speeds are well below hazardous levels, and with proper layering, the risk of hypothermia is minimal. Essential gear today includes sturdy hiking boots, and while not strictly necessary, carrying lightweight rain gear is a prudent precaution. Crampons or microspikes are not required given the current conditions.
As evening approaches and transitions into night, temperatures will drop to around 5℃. Plan your descent to avoid being on the mountain after sunset, ensuring a safe and comfortable experience.
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。