山岳レポート – 日本山岳気象レポート

Latest Report — 2026-07-28 07:07 JST

幌尻岳：午後霧雨の沢ルート。額平川コースは増水に注意

本日の幌尻岳は曇り空で始まり、正午にかけて気温は山頂で12.3℃まで上昇する。しかし午後15時には強い霧雨が始まり、以降も高湿度な状態が続く見込みだ。山麓との気温差は大きく、山頂の体感気温は7時現在で6.7℃、午後霧雨時でも8.7℃程度と肌寒く感じる。路面は全体的にウェットから泥濘状態となる。特に額平川コースの20回を超える沢渡渉では、午後からの霧雨で沢が増水する可能性があり、渡渉ポイントの見極めがより重要となる。ヒグマの密集地でもあるため、視界不良となる霧雨時は特に警戒を怠らないこと。低体温症のリスクは高まっている。濡れた体での行動は体熱を奪われやすいため、吸湿速乾ベースレイヤー、フリースなどのミッドレイヤー、そして防水透湿性のアウターは必須だ。休憩時や万一の停滞に備え、薄手の化繊中綿ジャケットも携行すること。沢靴や替えの靴下、防水バッグ、ヒグマ対策装備も忘れずに。落雷や強風の顕著なリスクは低いが、濡れによる低体温症には最大の注意を払うべきだ。沢の増水状況を常に確認し、無理な渡渉は避けること。夕方から夜間にかけて降水は収まるが、気温は7.4℃まで冷え込むため、濡れた衣類での行動は避ける。

今日の詳細レポートを読む →

81 件

2026 / July

24 reports

Mt. Poroshiri — 幌尻岳

午後霧雨の沢ルート。額平川コースは増水に注意

Humid Conditions with Afternoon Drizzle. Prepare for Wet River Crossings on

Mt. Poroshiri — 幌尻岳

低温の霧雨続く沢の渡渉は慎重に

Cool, Misty Conditions. Expect Wet and Slippery Terrain on Nukai River Course.

Mt. Poroshiri — 幌尻岳

霧雨が続く低温の一日。沢の増水と低体温症に備えよ

Persistent Drizzle and Low Temperatures. Expect Wet Conditions on River

Mt. Poroshiri — 幌尻岳

霧雨と沢の増水。額平川コースは渡渉に細心の注意を

Persistent Light Rain and Wet Terrain. Extreme Caution for Ebiragawa River

Mt. Poroshiri — 幌尻岳

午後から霧雨。額平川渡渉の増水に注意

Misty rain expected in afternoon. Watch for slippery river crossings on

Mt. Poroshiri — 幌尻岳

霧雨続き沢が増水傾向渡渉に細心の注意を

Wet Conditions, Intermittent Rain. Ebiragawa River Crossings High Risk from

Mt. Poroshiri — 幌尻岳

沢渡渉は慎重に霧雨と風で体感低下

Moderate mist and increasing wind by noon. Expect wet conditions on river

Mt. Poroshiri — 幌尻岳

額平川の渡渉に警戒霧雨と高湿度で足元注意

Intermittent Drizzle and High Humidity. Exercise Caution on River Crossings.

Mt. Poroshiri — 幌尻岳

額平川コース沢増水に警戒。濡れと低体温症に注意

Persistent Drizzle and Elevated Humidity. Expect Wet Trail Conditions and

Mt. Poroshiri — 幌尻岳

午前は快晴だが午後から霧雨の兆し。沢渡渉に注意

Mild Morning with Clear Visibility. Expect Light Drizzle in Afternoon. Prepare

Mt. Poroshiri — 幌尻岳

沢渡渉は慎重に午後から好転

Morning light rain then clearing. Expect wet conditions and swollen river

Mt. Poroshiri — 幌尻岳

霧雨と増水リスク額平川渡渉に慎重を

Light drizzle and poor visibility. Exercise extreme caution at swollen river

Mt. Poroshiri — 幌尻岳

霧雨が沢を濡らす額平川渡渉は足元注意

Midday Drizzle Makes Ebiragawa River Crossings Wet and Slippery. Prepare for

Mt. Poroshiri — 幌尻岳

視界不良と霧雨。沢渡渉に警戒

Foggy Summit, Light Rain from Noon. Ekibira River Crossings Require Caution.

Mt. Poroshiri — 幌尻岳

額平川増水注意。午後雷雨に警戒。

Persistent rain and afternoon thunderstorms. High risk of river swelling on

Mt. Poroshiri — 幌尻岳

雨と濃霧の一日。額平川コースの沢渡渉は増水に注意

Persistent Rain and Limited Visibility. Extreme Caution for River Crossings on

Mt. Poroshiri — 幌尻岳

沢の増水に警戒。早めの行動で下山を

Mild Day for River Crossings. Evening Rain Increases Water Levels.

Mt. Poroshiri — 幌尻岳

霧雨に濡れる沢筋。額平川渡渉は慎重に

Misty Conditions and Wet Trails. Caution for River Crossings on Nukanobira

Mt. Poroshiri — 幌尻岳

沢の渡渉は穏やか午後霧雨注意

Stable Morning for River Crossings. Light Drizzle Expected Mid-Afternoon.

Mt. Poroshiri — 幌尻岳

曇天の額平川コース。渡渉で濡れ低体温症に注意

Cloudy conditions persist for Horoshiri. Expect wet trails from numerous river

Mt. Poroshiri — 幌尻岳

幌尻岳沢渡渉慎重に午後霧雨警戒

Gentle morning conditions for river crossings. Prepare for light afternoon rain

Mt. Poroshiri — 幌尻岳

沢増水に警戒。視界不良の稜線は慎重に

Wet Terrain and Poor Visibility. Navigate River Crossings with Caution Today.

Mt. Poroshiri — 幌尻岳

霧雨に濡れる沢筋。額平川増水警戒

Persistent Drizzle, Poor Visibility. High Alert for River Swelling on

Mt. Poroshiri — 幌尻岳

幌尻岳快晴額平川渡渉は穏やか

Horoshiri Summit Clear and Calm. River Crossings Manageable. Evening Chill

2026 / June

30 reports

Mt. Poroshiri — 幌尻岳

穏やかな晴天続く。沢渡渉に注意

Clear Weather for Horoshiri. Expect Dry Trails, but Prepare for Cold Mornings

Mt. Poroshiri — 幌尻岳

額平川コースは霧雨で滑りやすく冷え込む

Misty Rain and Wet Conditions on River Crossings. Prepare for Cold and Slippery

Mt. Poroshiri — 幌尻岳

霧雨で視界不良。額平川渡渉に細心の注意を

Persistent Drizzle and Low Visibility. High Risk for River Crossings on

Mt. Poroshiri — 幌尻岳

霧雨と湿潤な沢筋。額平川コースは渡渉に警戒

Persistent Mist and Wet Trails. Caution for River Crossings on Nukabira Course.

Mt. Poroshiri — 幌尻岳

雨で沢増水に警戒。渡渉は困難に

Increasing rain and stream levels. Caution advised for river crossings on

Mt. Poroshiri — 幌尻岳

日中は快晴無風。夕方から沢の増水に警戒

Clear Morning with Gusts. Prepare for Wet River Crossings and Evening Drizzle.

Mt. Poroshiri — 幌尻岳

額平川は穏やか。稜線は午後に風強まる

Stable Conditions for River Crossings. Prepare for Moderate Winds on Ridges.

Mt. Poroshiri — 幌尻岳

霧雨が続く額平川コースは増水傾向

Persistent Drizzle and Wet Trails. High Alert for Swollen Rivers and

Mt. Poroshiri — 幌尻岳

幌尻岳視界不良と低温。沢の増水に警戒せよ

Misty and Cold Conditions. Prepare for Wet Terrain and River Crossings.

Mt. Poroshiri — 幌尻岳

幌尻岳山頂はガス中。体感低温に注意

Cloudy Summit with Poor Visibility. Expect Chilly, Damp Conditions on Trails.

Mt. Poroshiri — 幌尻岳

霧雨が続き視界不良。沢増水に厳重警戒

Persistent Drizzle and Low Visibility. Prepare for Wet Conditions and Swollen

Mt. Poroshiri — 幌尻岳

額平川増水と雷雨警戒。早めの行動を

Persistent rain raises river levels. Avoid the Nuka-biragawa route due to flood

Mt. Poroshiri — 幌尻岳

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.

Mt. Poroshiri — 幌尻岳

沢渡渉は穏やか。日高の原生林を静かに歩く一日

Calm day for river crossings. Enjoy the deep forest approach.

Mt. Poroshiri — 幌尻岳

霧雨と肌寒さ続く。額平川の増水に注意

Misty Rain and Cool Temps. Nuka-biragawa Crossings Demand Caution. Improvement

Mt. Poroshiri — 幌尻岳

霧雨が沢を濡らす。足元とヒグマに注意

Gentle stream crossings in the morning. Prepare for light afternoon drizzle and

Mt. Poroshiri — 幌尻岳

額平川コース沢渡渉は穏やか稜線は涼風

Clear skies and stable river conditions for the early ascent. Prepare for

Mt. Poroshiri — 幌尻岳

日中の霧雨と体感温度低下。沢渡渉は細心の注意を

Wet Trails and Cold Mist. Exercise Caution on River Crossings Today.

Mt. Poroshiri — 幌尻岳

霧雨で沢水量増加。額平川渡渉は慎重に

Light drizzle and rising river levels. Expect wet trails and cautious river

Mt. Poroshiri — 幌尻岳

額平川渡渉は午前中に。午後霧雨で増水警戒

Favorable Morning for River Crossings. Light Drizzle Expected Afternoon, Watch

Mt. Poroshiri — 幌尻岳

霧雨が続き体感は真冬。額平川は増水に注意

Persistent Drizzle and Near-Freezing Summit. High Risk of Hypothermia on Wet

Mt. Poroshiri — 幌尻岳

霧雨と低温継続。沢増水と低体温症に厳重警戒

Persistent Drizzle and Near-Freezing Temps. Expect Wet Terrain and Swollen

Mt. Poroshiri — 幌尻岳

終日霧雨と氷点下。低体温症リスク高まる

Persistent Freezing Rain and Near-Zero Visibility. High Hypothermia Risk. Avoid

Mt. Poroshiri — 幌尻岳

霧雨と低温続く。額平川渡渉は滑りに警戒

Persistent light rain and cool temperatures. Wet trails demand caution on river

Mt. Poroshiri — 幌尻岳

稜線に冬の気配低体温に厳重警戒

Sudden cold snap returns to Mt. Poroshiri. Prepare for snow and challenging

Mt. Poroshiri — 幌尻岳

額平川コース冷涼な水に注意

Chilly and Cloudy. Cold River Crossings Demand Caution. Evening Temperatures

Mt. Poroshiri — 幌尻岳

快晴微風の登山日和。夕方以降は急激な冷え込みに警戒

Clear Skies and Mild Winds. Prepare for Significant Evening Temperature Drop.

Mt. Poroshiri — 幌尻岳

沢渡渉は穏やか。午後から霧雨に注意

Mildly Cloudy Conditions for Nukai-biragawa River Crossings. Prepare for Light

Mt. Poroshiri — 幌尻岳

日高の稜線は突風注意。沢渡渉は水量確認を

Clear Skies and Warm Daytime Conditions. Prepare for Rapid Temperature Drop by

Mt. Poroshiri — 幌尻岳

額平川コースは快晴。沢の水量に注意

Clear Skies and Mild Winds for Hidaka’s Highest. Prepare for River Crossings.

2026 / May

27 reports

Mt. Poroshiri — 幌尻岳

稜線は強風と霧雨額平川渡渉に警戒

Strong Gusts and Light Drizzle from Noon. Exercise Extreme Caution on Hira-gawa

Mt. Poroshiri — 幌尻岳

稜線は暴風雨。沢は増水。行動中止を

Heavy Rain and Extreme Gusts. High Risk of Hypothermia. Avoid Exposed Ridges.

Mt. Poroshiri — 幌尻岳

沢の急増水と午後からの低体温症に厳重警戒

Heavy Rain and Icy Temperatures on Summit. High Risk of Hypothermia and River

Mt. Poroshiri — 幌尻岳

額平川コース霧雨で沢増水に注意

Persistent Drizzle and Wet River Crossings on Horoshiri-dake Today.

Mt. Poroshiri — 幌尻岳

額平川コースは濡れ。稜線は風に注意

Wet River Crossings Expected. Prepare for Gusts on Exposed Ridges.

Mt. Poroshiri — 幌尻岳

沢の水量穏やか。渡渉に集中し原生林を歩け

Calm, Dry Conditions for Hiking. Prepare for Multiple River Crossings.

Mt. Poroshiri — 幌尻岳

額平川コースは濡れて冷える。午後は好転

Wet and Chilly Morning on River Routes. Improved Visibility and Warmer

Mt. Poroshiri — 幌尻岳

日中は冷涼な曇り。夕方から霧雨で沢は濡れる

Cool conditions persist on ridges. Wet terrain in stream crossings on the

Mt. Poroshiri — 幌尻岳

額平川泥濘に注意。行動は早めに切り上げを

Moderate Conditions with Muddy River Crossings. Prepare for Significant Evening

Mt. Poroshiri — 幌尻岳

沢渡渉は慎重に。残雪と泥濘に注意

Mild Conditions with Increasing River Levels. Prepare for Wet Crossings and

Mt. Poroshiri — 幌尻岳

日中は霧雨と低温に注意。沢渡渉は慎重に

Cloudy with light drizzle expected this afternoon. Prepare for significant

Mt. Poroshiri — 幌尻岳

額平川霧雨で増水注意。低体温症警戒

Wet River Crossings and Low Visibility. Prepare for Cold, Damp Conditions.

Mt. Poroshiri — 幌尻岳

薄曇りの沢筋。風強く午後は霧雨に注意

Variable Clouds, Gusty Winds. Prepare for Afternoon Drizzle and Temperature

Mt. Poroshiri — 幌尻岳

薄曇り日中は穏やか稜線午後に風強まる

Mild Morning with Increasing Winds on Exposed Ridges. Prepare for Rapid

Mt. Poroshiri — 幌尻岳

沢筋は増水傾向。額平川渡渉に慎重な判断を

Melting Snow and Rising River Levels on Horoshiri. Navigate Streams with

Mt. Poroshiri — 幌尻岳

残雪融け進む幌尻岳。日中の好天も夜は急冷

Fine weather on Horoshiri-dake. Melting snow on trails and evening temperature

Mt. Poroshiri — 幌尻岳

残雪期の沢渡渉冷水に警戒

Mild Conditions with Lingering Snow Patches. Expect Cold River Crossings.

Mt. Poroshiri — 幌尻岳

残雪緩む幌尻岳沢渡渉に注意

Mild Spring Conditions on Horoshiri. Melting Snowpack. Good Visibility Expected.

Mt. Poroshiri — 幌尻岳

額平川コースは沢増水に警戒。稜線は残雪と急な冷え込み

Melting Snow and River Crossings. Prepare for Rapid Temperature Drop in

Mt. Poroshiri — 幌尻岳

残雪融解進む沢の増水警戒稜線は突風に注意

Clear skies and melting snow. Expect firm morning snow, softening midday. Gusty

Mt. Poroshiri — 幌尻岳

融雪と強風の稜線。沢渡渉は水量見極めを

Snowmelt Increases River Flow and Gusts on Upper Slopes. Expect Icy Patches.

Mt. Poroshiri — 幌尻岳

残雪緩み強風吹き荒れる。稜線は避けて行動せよ

Spring Snow Thaws. Beware Strong Gusts on Exposed Ridges. Focus on Protected

Mt. Poroshiri — 幌尻岳

霧雨と残雪の山頂。稜線凍結に注意

Chilly Mist and Residual Snow. Navigate Cautiously on Icy Patches.

Mt. Poroshiri — 幌尻岳

残雪と霧雨続く沢筋。夜間の降雨で渡渉注意

Wet Conditions and Remaining Snowpack. River Crossing Risks Increase Overnight.

Mt. Poroshiri — 幌尻岳

稜線は突風。額平川の沢渡渉は水量と足元に注意

Strong Gusts on Ridge. Navigate Icy Stream Crossings Carefully.

Mt. Poroshiri — 幌尻岳

稜線は突風に荒れる。残雪と凍結に警戒

Extreme Gusts on Exposed Ridges. Navigate Snowy Terrain with Caution.

Mt. Poroshiri — 幌尻岳

残雪に強風稜線は厳冬期の様相

Summit exposed to severe winds and ice. Navigate with extreme caution on