English: In 2020, Siberia experienced one of the most dramatic summers on record due to a number of mega wildfires and severe heatwaves that affected the region. According to the Copernicus Climate Change Service (C3S), September 2020 was the warmest September on record. In particular, temperatures were exceptionally high for September in the Arctic portion of Siberia and in the Arctic Ocean, reaching anomalies of +6-10°C. As consequence, the exceptional Arctic fire season in Siberia is not yet over. This image, acquired by one of the Copernicus Sentinel-2 satellites on 7 October 2020, shows two hot spots still active in the Arctic circle. These hot spots are caused by forest fires, and are located in an area of Siberia (68.284 N, 152.545E) where the water of thermokarst lakes has started to freeze. The Copernicus Sentinel-2 mission, which is composed of two twin satellites, Sentinel-2A and Sentinel-2B, provides multispectral data over 13 different spectral bands with a maximum spatial resolution of 10m and a maximum revisit time of 5 days. Thanks to these specifications, the Sentinel-2 data can be used for operational applications in the field of wildfire detection and monitoring.