幌尻岳山頂付近は現在曇り、気温は12.2℃、体感は9.9℃で風は穏やかです。日中の最高気温は12時頃に14℃まで上昇し、その後は緩やかに低下します。風速は終日5m/s程度の突風があるものの、全体的に微風で推移する見込みです。視程は良好で、日中の行動には比較的穏やかな気象条件と言えます。
地面コンディションは、降水が予報期間を通じて0mmのため、登山道は概ねドライ傾向です。しかし、額平川コースは20回を超える沢渡渉があり、沢床は常にウェットで滑りやすい状態です。渡渉点では特に慎重な足運びを心がけ、ストックを活用してバランスを保ってください。アイゼンやチェーンスパイクは不要です。雨具は防風・防寒着としても必携です。沢靴や替えの靴下、タオルなど、渡渉対策の装備を準備してください。
自動リスク判定にある通り、予報期間中に7℃の急激な気温低下が見込まれます。特に夕方から夜間にかけて気温は下がり、翌早朝には5.6℃まで冷え込みます。日中快適でも、停滞時の低体温症リスクに備え、厚手のフリースや軽量ダウンジャケットなど保温性の高い防寒レイヤーを必ず携行してください。行動中の急変に備え、引き返しの判断は早めに行ってください。
幌尻岳はヒグマの生息密度が高い地域です。行動中は複数人で、鈴やホイッスルで音を出し、食料管理を徹底してください。また、日高山脈最高峰へのアプローチは長距離となるため、体力配分と余裕を持った計画が重要です。気象条件は穏やかですが、山域固有のリスクへの十分な準備と注意が必要です。
北海道
幌尻岳
Mt. Poroshiri
2026年6月18日 07:45 更新
穏やかな山行日和。沢渡渉は慎重に
Mild Cloudy Day on Horshiri. Prepare for River Crossings and Evening Chill.
現在の気象状況 — Current Conditions
▲ 山頂エリア (Summit)
気温 Temp
+12.2°C
風速 Wind
1.4m/s
S
天候 Weather
☁️ 曇り
体感 Feels Like
+9.9°C
▼ 登山口・山麓エリア (Base)
気温 Temp
+22.4°C
風速 Wind
1.3m/s
SW
天候 Weather
☁️ 曇り
標高 Altitude
320m
山頂の3時間予報 — Summit Forecast
09:00
+13°C
0.9m/s
SSE
💧 0mm
(0%)
12:00
+14°C
1.1m/s
S
💧 0mm
(2%)
15:00
+13°C
1m/s
SSE
💧 0mm
(27%)
18:00
+10°C
1m/s
ESE
💧 0mm
(0%)
21:00
+7°C
1.6m/s
SE
💧 0mm
(0%)
00:00
+6°C
1.4m/s
SE
💧 0mm
(0%)
03:00
+6°C
1.2m/s
SE
💧 0mm
(4%)
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
Currently, it is cloudy near the summit of Mount Horoshiri, with a temperature of 12.2℃ and a feels like temperature of 9.9℃. Winds are light. The maximum temperature during the day will reach 14℃ around noon, gradually decreasing thereafter. Gusts are expected to be around 5m/s throughout the day, but overall, it will remain mostly calm. Visibility is good, indicating relatively mild weather conditions for daytime activities.
Regarding ground conditions, with no precipitation forecast throughout the period, the trails are expected to be mostly dry. However, the Ekihiragawa course involves over 20 river crossings, where the riverbeds will be wet and slippery. Exercise extreme caution at crossing points, using trekking poles for balance. Crampons or microspikes are not necessary. Rain gear is essential for wind and cold protection. Prepare river shoes, spare socks, and towels for river crossings.
As indicated by the automated risk assessment, a rapid temperature drop of about 7℃ is expected during the forecast period. Temperatures will significantly decrease from evening into night, reaching as low as 5.6℃ by early morning. Even if comfortable during the day, carry warm layers such as a thick fleece or a lightweight down jacket to mitigate the risk of hypothermia during stops. Be prepared for sudden changes during your activity and consider turning back early if conditions worsen.
Mount Horoshiri is an area with a high density of brown bear inhabitants. When active, travel in groups, make noise with bells or whistles, and manage food supplies carefully. Furthermore, the approach to the highest peak in the Hidaka Mountains is long, so proper physical conditioning and a well-planned itinerary are crucial. While weather conditions are mild, thorough preparation and caution against the unique risks of this mountain range are essential.
Regarding ground conditions, with no precipitation forecast throughout the period, the trails are expected to be mostly dry. However, the Ekihiragawa course involves over 20 river crossings, where the riverbeds will be wet and slippery. Exercise extreme caution at crossing points, using trekking poles for balance. Crampons or microspikes are not necessary. Rain gear is essential for wind and cold protection. Prepare river shoes, spare socks, and towels for river crossings.
As indicated by the automated risk assessment, a rapid temperature drop of about 7℃ is expected during the forecast period. Temperatures will significantly decrease from evening into night, reaching as low as 5.6℃ by early morning. Even if comfortable during the day, carry warm layers such as a thick fleece or a lightweight down jacket to mitigate the risk of hypothermia during stops. Be prepared for sudden changes during your activity and consider turning back early if conditions worsen.
Mount Horoshiri is an area with a high density of brown bear inhabitants. When active, travel in groups, make noise with bells or whistles, and manage food supplies carefully. Furthermore, the approach to the highest peak in the Hidaka Mountains is long, so proper physical conditioning and a well-planned itinerary are crucial. While weather conditions are mild, thorough preparation and caution against the unique risks of this mountain range are essential.
山岳ガイド — Mountain Guide
概要 Overview
北海道沙流郡平取町・新冠郡新冠町・日高郡新ひだか町にまたがる標高2,053mの日高山脈の最高峰。「最も困難な百名山」と称される険峻な山で、沢渡渉と長距離アプローチが特徴。
特徴・地形 Features
山頂への一般ルートには二十数回の沢渡渉が含まれ、日高山脈特有の深い原生林を抜ける。山頂部はカール地形と高山植物群落が広がる。
ベストシーズン Best Season
7月〜9月中旬。沢渡渉のため増水期・残雪期は困難。9月以降は寒気で危険。
主要ルート Main Routes
額平川コース(最一般的・幌尻山荘経由)、新冠コース、戸蔦別経由。
注意点・危険箇所 Cautions
沢の急増水で渡渉不能となるケース多数。山荘予約必須・抽選制。ヒグマ密集地で対策必須。
アクセス Access
平取町振内地区からシャトルバスで額平川登山口へ(要予約)。マイカーアクセス制限あり。
※ 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。