07:00現在、苗場山山頂はほぼ晴れ、体感気温2.6℃と肌寒い。山麓との気温差は7.3℃と大きい。日中は薄曇りとなるが、気温は12:00には10.8℃まで上昇し、風も穏やかで行動しやすい一日となる。積雪はゼロ。
山頂台地の広大な湿原は、積雪が消え地面は概ねドライ傾向だが、池塘周辺や日陰はウェットな箇所や泥濘が残るだろう。特に湿原内の木道は滑りやすいため、足元に注意し木道外への踏み込みは厳に禁じること。適切な防水性のあるトレッキングシューズを推奨する。低体温症のリスクは低いが、朝の冷え込みや行動停止時に備え、速乾性ベース、フリース等のミッド、防風シェルは必須。
雨具は降水確率が低いものの携行を推奨する。15:00の降水確率は45%だが降水量は0mm予報であり、雷雨のリスクは低い。日中の最大突風は15:00の5.2m/sと非常に穏やかで、強風による行動制限はない。視程は20km以上と良好で、台地での濃霧による道迷いの心配は少ない。しかし山の天気は変わりやすい。常に周囲の状況を確認し、変化の兆候を見逃さないこと。夕方以降は気温が緩やかに下がる。
新潟県・長野県
苗場山
Mt. Naeba
2026年5月11日 06:49 更新
苗場台地は穏やか。湿原散策に好適
Gentle Spring Day on Naeba Plateau. Ideal for Wetland Trails. Minimal Winds.
現在の気象状況 — Current Conditions
▲ 山頂エリア (Summit)
気温 Temp
+5.8°C
風速 Wind
0.7m/s
S
天候 Weather
🌤️ ほぼ晴れ
体感 Feels Like
+2.6°C
▼ 登山口・山麓エリア (Base)
気温 Temp
+13.1°C
風速 Wind
0.9m/s
S
天候 Weather
🌤️ ほぼ晴れ
標高 Altitude
1,006m
山頂の3時間予報 — Summit Forecast
09:00
+9°C
0.6m/s
WSW
💧 0mm
(0%)
12:00
+11°C
0.5m/s
N
💧 0mm
(8%)
15:00
+10°C
0.7m/s
NE
💧 0mm
(45%)
18:00
+6°C
1.1m/s
ENE
💧 0mm
(12%)
21:00
+4°C
1.7m/s
SSE
💧 0mm
(6%)
00:00
+4°C
1.1m/s
S
💧 0mm
(0%)
03:00
+3°C
1m/s
S
💧 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
At 7:00 AM, Naeba-san summit is mostly clear with a perceived temperature of 2.6°C, indicating a significant temperature difference from the base. Throughout the day, it will become partly cloudy, but temperatures are expected to rise to 10.8°C by noon. Winds will remain light, making for a comfortable day for activity. Snowfall is zero.
The expansive wetlands on the summit plateau are largely dry as the snow has melted. However, expect some wet and muddy sections around the ponds (Iketou) and in shaded areas. Be especially careful on the wooden boardwalks within the wetlands, as they can be slippery. Strictly prohibit stepping off the boardwalks to protect the delicate ecosystem. Waterproof trekking shoes are recommended.
The risk of hypothermia is low, but be prepared for the chilly morning and potential cooling during breaks. A quick-drying base layer, a fleece mid-layer, and a windproof shell are essential. While the chance of precipitation is low, carrying rain gear is still advised. The precipitation probability at 3:00 PM is 45%, but with no rainfall predicted, the risk of thunderstorms is minimal. The maximum gust during the day is 5.2 m/s at 3:00 PM, which is very mild, posing no strong wind hazard.
Visibility is excellent, exceeding 20km, reducing concerns about getting lost in dense fog on the plateau. However, mountain weather can change rapidly. Continuously monitor your surroundings and be alert to any changes. Temperatures will gradually decrease from late afternoon into the evening.
The expansive wetlands on the summit plateau are largely dry as the snow has melted. However, expect some wet and muddy sections around the ponds (Iketou) and in shaded areas. Be especially careful on the wooden boardwalks within the wetlands, as they can be slippery. Strictly prohibit stepping off the boardwalks to protect the delicate ecosystem. Waterproof trekking shoes are recommended.
The risk of hypothermia is low, but be prepared for the chilly morning and potential cooling during breaks. A quick-drying base layer, a fleece mid-layer, and a windproof shell are essential. While the chance of precipitation is low, carrying rain gear is still advised. The precipitation probability at 3:00 PM is 45%, but with no rainfall predicted, the risk of thunderstorms is minimal. The maximum gust during the day is 5.2 m/s at 3:00 PM, which is very mild, posing no strong wind hazard.
Visibility is excellent, exceeding 20km, reducing concerns about getting lost in dense fog on the plateau. However, mountain weather can change rapidly. Continuously monitor your surroundings and be alert to any changes. Temperatures will gradually decrease from late afternoon into the evening.
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。