Extreme rain in Japan, 18 to 21 October 2026
Extreme rain in Japan, 18 to 21 October 2026: 9 records at 7 stations, peak on 20 October 2026. Closed.
Data as of . Last revised (2026-11-12).
Key Facts
- Extreme rain in Japan, 18 to 21 October 2026 set or tied 9 station records at 7 stations.
- It ran from 18 October 2026 to 21 October 2026 (4 days) and its peak day was 20 October 2026.
- Status: closed.
- Mombetsu set a daily record precipitation of 80.5 mm (3.2 in) on 20 October 2026 (provisional).
- The busiest day was 20 October 2026 with 5 records.
- The oldest broken record in the ranked list had stood for 47 years.
Footprint
18 to 21 October 2026| Station | Type | Value | Date |
|---|---|---|---|
| Mombetsu | Record daily precipitation | 80.5 mm (3.2 in) | 2026-10-20 |
| Rumoi | Record daily precipitation | 96.0 mm (3.8 in) | 2026-10-21 |
| Asahikawa | Record daily precipitation | 50.0 mm (2.0 in) | 2026-10-21 |
| Suttsu | Record daily precipitation | 71.5 mm (2.8 in) | 2026-10-20 |
| Sapporo | Record daily precipitation | 106.0 mm (4.2 in) | 2026-10-21 |
| Wakkanai | Record daily precipitation | 60.0 mm (2.4 in) | 2026-10-20 |
| Obihiro | Record daily precipitation | 139.5 mm (5.5 in) | 2026-10-19 |
| Kutchan | Record daily precipitation | 39.0 mm (1.5 in) | 2026-10-21 |
| Omu | Record daily precipitation | 43.0 mm (1.7 in) | 2026-10-20 |
Records per Day
Peak day 5| Date | Records |
|---|---|
| 2026-10-18 | 1 |
| 2026-10-19 | 1 |
| 2026-10-20 | 5 |
| 2026-10-21 | 2 |
Top Records by Margin
Margin over the record replaced| Mombetsu, 10-20 | |
|---|---|
| Wakkanai, 10-20 | |
| Obihiro, 10-19 | |
| Suttsu, 10-20 | |
| Obihiro, 10-20 | |
| Sapporo, 10-18 | |
| Omu, 10-20 |
Margin is how far the new value is beyond the record it replaced. Ties are not shown.
Margin Against Age of the Broken Record
| Margin (mm) | Years the old record stood |
|---|---|
| 41 | 47 |
| 15 | 44 |
| 22 | 20 |
| 21 | 0 |
| 10 | 31 |
| 2 | 47 |
| 3 | 40 |
Compared With Other Events
Station records per event| Extreme rain in United States and Mexico, 23 February to 15 March 2019 | |
|---|---|
| Extreme rain in United States, 3 to 19 January 2024 | |
| Extreme rain in Australia, 7 to 26 March 2021 | |
| Extreme rain in United States and Mexico, 29 September to 19 October 2018 | |
| Extreme rain in United States, 19 December 2022 to 13 January 2023 | |
| Extreme rain in Japan, 18 to 21 October 2026 (this event) |
Every Record Set
11 of 9| Date | Station | Record | Value | Margin | Years stood | Significance |
|---|---|---|---|---|---|---|
| 2026-10-18 | Sapporo | Record daily precipitation (provisional) | 41.0 mm (1.6 in) | 3.0 mm (0.12 in) | 40 | 21 of 100 (Routine) |
| 2026-10-19 | Obihiro | Record daily precipitation (provisional) | 139.5 mm (5.5 in) | 20.5 mm (0.8 in) | 0 | 32 of 100 (Routine) |
| 2026-10-20 | Mombetsu | Record daily precipitation (provisional) | 80.5 mm (3.2 in) | 41.0 mm (1.6 in) | 47 | 59 of 100 (Notable) |
| 2026-10-20 | Suttsu | Record daily precipitation (provisional) | 71.5 mm (2.8 in) | 15.0 mm (0.6 in) | 44 | 35 of 100 (Notable) |
| 2026-10-20 | Wakkanai | Record daily precipitation (provisional) | 60.0 mm (2.4 in) | 21.9 mm (0.9 in) | 20 | 33 of 100 (Routine) |
| 2026-10-20 | Obihiro | Record daily precipitation (provisional) | 71.5 mm (2.8 in) | 9.5 mm (0.37 in) | 31 | 23 of 100 (Routine) |
| 2026-10-20 | Omu | Record daily precipitation (provisional) | 43.0 mm (1.7 in) | 2.0 mm (0.08 in) | 47 | 22 of 100 (Routine) |
| 2026-10-21 | Rumoi | Record daily precipitation (provisional) | 96.0 mm (3.8 in) | 22.5 mm (0.9 in) | 0 | 44 of 100 (Notable) |
| 2026-10-21 | Asahikawa | Record daily precipitation (provisional) | 50.0 mm (2.0 in) | 12.5 mm (0.5 in) | 49 | 37 of 100 (Notable) |
| 2026-10-21 | Sapporo | Record daily precipitation (provisional) | 106.0 mm (4.2 in) | 3.5 mm (0.14 in) | 47 | 34 of 100 (Routine) |
| 2026-10-21 | Kutchan | Record daily precipitation (provisional) | 39.0 mm (1.5 in) | 8.0 mm (0.31 in) | 41 | 26 of 100 (Routine) |
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Source: NOAA National Centers for Environmental Information, Global Historical Climatology Network Daily (GHCN-Daily). Records are computed by World Extreme Weather Monitor and are not official NOAA products. (US Government open data (NOAA NCEI)) Data as of 2026-11-12. Events are found by this site from station records and are not official designations. Records are provisional until reprocessed.