Kamisu fire, July 2026 Kashima, Kamisu
The fire started on 18 July 2026 in Kamisu, Japan, and satellites saw it burning for 24 days. Copernicus’s global GWIS system rebuilt a burnt perimeter of 825 hectares from heat detections, spread across 2 municipalities.
Number 11 in Japan in 2026, of 94.
The power measured by the satellite is low (17.4 MW in the strongest hotspot), more typical of grass or stubble burning, or a slow surface fire, than of a large crown fire.
- Burnt area
- 825ha
- GWIS perimeter (Copernicus)
- Duration
- 24days
- 18 Jul 2026 – 10 Aug 2026
- Municipalities hit
- 2
- municipalities
- Started on
- 18 Jul
- 2026
- Heat detections
- 55
- in a single hotspot: 17 MW
- Danger at start
- 8
- Low · FWI index
- Energy released
- 154MW
- sum of detected power
Where it burned
How it evolved, day by day
Fire radiative power detected each day, in megawatts, and number of hotspots. The magenta bar marks the peak day.
The weather it burned in
It had gone 4 days without rain (1 mm or more) when it started. Rain came after the fire: 3.3 mm on 16 Aug.
This area had burned before
No earlier perimeters overlap this fire since 2016, when the satellite record begins.
What happened to each town
-
523 ha5.0 %
-
Kamisu where it started249 ha1.7 %
Burnt area inside each municipality, from crossing the GWIS perimeter with administrative boundaries. The distance is from the town centre to the nearest fire: staying a kilometre away does not mean it reached the houses.
The weather day by day
ECMWF ERA5 reanalysis at the fire location, the standard reference for past weather, and the Canadian Fire Weather Index (the same system Copernicus uses), computed by WorldFires from that data. Days after the fire run until the first rain.
Open-Meteo.com (CC BY 4.0) · Copernicus Climate Change Service (ERA5)
| Day | High | Min. humidity | Peak gust | Rain | Danger (FWI) |
|---|---|---|---|---|---|
| 18 Jul | 30.0 °C | 59 % | 18 km/h | 0.0 mm | Low 8 |
| 19 Jul | 30.5 °C | 62 % | 18 km/h | 0.0 mm | Low 8 |
| 20 Jul | 35.5 °C | 45 % | 16 km/h | 0.0 mm | Moderate 12 |
| 21 Jul | 36.2 °C | 44 % | 16 km/h | 0.1 mm | Moderate 14 |
| 22 Jul | 34.8 °C | 49 % | 17 km/h | 1.5 mm | Low 10 |
| 23 Jul | 31.5 °C | 55 % | 16 km/h | 0.0 mm | Moderate 11 |
| 24 Jul | 29.9 °C | 69 % | 14 km/h | 8.2 mm | Very low 1 |
| 25 Jul | 28.9 °C | 71 % | 25 km/h | 9.7 mm | Very low 0 |
| 26 Jul | 32.5 °C | 56 % | 11 km/h | 25.2 mm | Very low 0 |
| 27 Jul | 25.0 °C | 71 % | 26 km/h | 0.4 mm | Very low 2 |
| 28 Jul | 28.4 °C | 72 % | 33 km/h | 6.6 mm | Very low 0 |
| 29 Jul | 33.9 °C | 48 % | 27 km/h | 0.0 mm | Very low 3 |
| 30 Jul | 34.1 °C | 57 % | 19 km/h | 0.2 mm | Very low 5 |
| 31 Jul | 30.4 °C | 65 % | 27 km/h | 0.3 mm | Low 6 |
| 1 Aug | 33.5 °C | 62 % | 24 km/h | 0.1 mm | Low 6 |
| 2 Aug | 27.3 °C | 80 % | 46 km/h | 1.3 mm | Very low 3 |
| 3 Aug | 25.1 °C | 74 % | 40 km/h | 0.9 mm | Very low 3 |
| 4 Aug | 25.8 °C | 70 % | 41 km/h | 0.0 mm | Very low 4 |
| 5 Aug | 27.0 °C | 69 % | 32 km/h | 0.0 mm | Very low 5 |
| 6 Aug | 30.0 °C | 74 % | 30 km/h | 0.0 mm | Very low 5 |
| 7 Aug | 31.1 °C | 67 % | 39 km/h | 0.2 mm | Low 8 |
| 8 Aug | 32.0 °C | 61 % | 32 km/h | 0.0 mm | Low 8 |
| 9 Aug | 29.5 °C | 68 % | 32 km/h | 0.0 mm | Low 8 |
| 10 Aug | 27.0 °C | 73 % | 55 km/h | 0.0 mm | Low 10 |
| 11 Aug after | 25.0 °C | 66 % | 71 km/h | 13.6 mm | Very low 2 |
| 12 Aug after | 26.9 °C | 81 % | 51 km/h | 29.7 mm | Very low 0 |
| 13 Aug after | 26.2 °C | 89 % | 30 km/h | 29.7 mm | Very low 0 |
| 14 Aug after | 27.0 °C | 86 % | 26 km/h | 27.6 mm | Very low 0 |
| 15 Aug after | 27.4 °C | 69 % | 32 km/h | 1.1 mm | Very low 0 |
| 16 Aug after | 26.1 °C | 81 % | 26 km/h | 3.3 mm | Very low 0 |
Before and after, from space
Drag the line to compare the same ground before the fire and after it.
If the day is cloudy, change the date: each satellite passes once a day. In false colour the burnt ground looks brown or red.
The smoke
CAMS · CopernicusOn 22 July 2026 the air beside the fire reached 56 µg/m³ of PM2.5. That day averaged 30: 2.0 times the WHO daily guideline (15).
Particles from the Copernicus CAMS model at the centre of the perimeter; these are not measurements in each town. The pale bar is the worst hour, the solid one the daily average.
Open-Meteo.com (CC BY 4.0) · Copernicus Atmosphere Monitoring Service (CAMS)
Detections table · 55Every satellite heat detection, one by one, with time, satellite, power and coordinates.
| Date and time | Satellite | FRP (MW) | Lat | Lon |
|---|
Other fires nearby
Frequently asked questions
- How long did the Kamisu fire last?
- GWIS (Copernicus) dates it between 18 July 2026 and 10 August 2026: 24 days between the first and last heat detection of the perimeter.
- How much area did it burn?
- The perimeter GWIS (Copernicus) rebuilt from heat detections is 825 hectares (8.2 km²). It is an estimate: official national figures may differ.
- Which municipalities burned?
- The fire entered 2 municipalities: Kashima (523 ha, 5.0 %); Kamisu (249 ha, 1.7 %).
- What was the weather like?
- During the fire the temperature reached 36.2 °C, humidity dropped to 44 % and gusts hit 71 km/h. The fire danger index (FWI) reached 14, class Moderate.
- Where does this data come from?
- From the GWIS (Copernicus) burnt perimeter, NASA FIRMS VIIRS hotspots and the administrative boundaries of Japan (geoBoundaries). It is not an official report.
Where to verify it
A satellite detection is not an official report. Final figures and the fire’s status are published by each country’s emergency service.
Emergency number: 119
Satellite cross-check
Does something look wrong on this page?
This page is built from satellite data and official records, and it sometimes gets things wrong: the wrong dates, the wrong town, two fires merged into one, or something that was not a wildfire at all. If you know this fire first-hand (you live nearby, saw it, fought it or reported on it), tell us what really happened and we will check it.
Report an error
Where this data comes from
The perimeter comes from the Copernicus Global Wildfire Information System (GWIS), which rebuilds it from MODIS and VIIRS heat detections and publishes it under CC BY 4.0. It is not measured on imagery as in Europe, so it is an estimate. Heat detections come from the VIIRS sensors aboard Suomi-NPP and NOAA-20, distributed by NASA FIRMS at 375 m resolution. Municipal boundaries come from geoBoundaries ADM2 (Creative Commons Attribution-ShareAlike 2.0). The area per municipality is computed by WorldFires by crossing the perimeter with those boundaries, so it may differ from each country’s official figure.