# Summit Weather Japan: YAMAYOMI — Summit forecast, 1,059 peaks

> Summit forecast, 1,059 peaks (iPhone/iPad app by 合同会社SUTEKINA JIKAN.)

- Source: https://appshunter.io/ios/app/summit-weather-japan-yamayomi/id6806143842 (this page in markdown: same URL + `.md`)
- Developer: [合同会社SUTEKINA JIKAN](https://appshunter.io/developer/6795682739)
- Category: Weather, Sports
- Price: Free
- Age rating: 4+
- Requires: iOS 15.1 · 38 MB
- Languages: Japanese
- Released: 2026-09-06
- Data updated: 2026-09-23
- User reviews in markdown: https://appshunter.io/ios/app/summit-weather-japan-yamayomi/id6806143842/reviews.md

## What is Summit Weather Japan?

YAMAYOMI rates the summit weather of 1,059 Japanese peaks, including all 100 Famous Mountains (Hyakumeizan), so you can pick the right day and the right mountain in 30 seconds. Free, no account.

SUMMIT CONDITIONS, NOT VALLEY WEATHER
Every forecast is corrected to summit elevation. Gusts, precipitation, lightning, hypothermia risk and visibility are combined into a 5-level climbing score. Daily ratings use the harshest hour of the walking window (6:00-15:00), so the score errs on the safe side.

MAP FIRST
Peaks appear as color-coded pins on a nationwide map. See at a glance which mountains look good this week. Switch layers between score, temperature and wind.

7-DAY OUTLOOK
Each peak shows daily scores for the next 7 days, with gusts, precipitation and the summit's low temperature.

ASK "WHEN SHOULD I GO?"
Pick a mountain and get a plain-language answer about which day looks best and why (wind, rain, temperature). Compare several peaks side by side.

1,059 PEAKS
Based on the Geospatial Information Authority of Japan's list of major mountains. All 100 Famous Mountains are included.

PRIVACY
No ads, no account, no location tracking. Usage statistics can be turned off in Settings at any time.

NOTE
Ratings are estimates from weather models and may differ from actual conditions. Trail status, snowpack and hut information are not included. The final decision is yours.

Mountain data: Geospatial Information Authority of Japan. Forecast: Open-Meteo.


## Version history (last 4 releases)

### 1.0.3 — 2026-09-15

Store listing updated (English added). Minor improvements.

### 1.0.2 — 2026-09-12

・相談タブに「最近見た山」「スコア上位の百名山」の候補を追加。タップするだけで条件を確認できます
・細かな改善

### 1.0.1 — 2026-09-08

・App Store上の言語表記を日本語に修正しました

### 1.0.0 — 2026-09-06

No release notes.

## More apps by 合同会社SUTEKINA JIKAN

- [サーフィン波予報・潮見表 MICHIHIKI](https://appshunter.io/ios/app/michihiki/id6795682737)
- [Camp Weather Japan: KUMOYUKI](https://appshunter.io/ios/app/camp-weather-japan-kumoyuki/id6806218228)
- [ゴルフ天気・キャンセル前に決める KIMEDOKI](https://appshunter.io/ios/app/kimedoki/id6806920865)

All apps by 合同会社SUTEKINA JIKAN: https://appshunter.io/developer/6795682739

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-23.*