Space Weather Prediction Center

National Oceanic and Atmospheric Administration

Solar Cycle 25 Likely Reached the Highest Sunspot Number in over 20 Years

Solar Cycle 25 Likely Reached the Highest Sunspot Number in over 20 Years
Solar Cycle 25 Likely Reached the Highest Sunspot Number in over 20 Years
published: Friday, January 30, 2026 19:54 UTC UTC

Solar Cycle 25 likely reached the highest sunspot number yet - a value of at least 299. The Space Weather Prediction Center (SWPC) non-official, estimated daily sunspot number for August 8th was 337, a value not observed since March 2001. However, the official SSN is determined by the World Data Center - Sunspot Index and Long-Term Solar Observations (WDC-SILSO) and it's Solar Influences Data Center (SIDC) at the Royal Observatory in Belgium; and their initial daily estimate for August 8th was 299. They will report out the official number by September 1st. Visit their webpage at: https://www.sidc.be/SILSO/home and as always visit our webpage for the latest space weather information and forecasts.