Real-time altitude, cabin pressure, temperature and more from NASA via Lightstreamer · updated every 60 seconds
Download the macOS menu bar appISS Monitor collects live telemetry from the International Space Station. Altitude data is sourced from wheretheiss.at. Cabin pressure, temperature, total mass, and urine tank level are streamed directly from NASA via Lightstreamer (push.lightstreamer.com, adapter ISSLIVE). Data is collected and stored every minute.
The ISS orbits Earth at approximately 400–420 km altitude. The orbit decays slowly due to atmospheric drag and is periodically boosted by reboost maneuvers using the station's thrusters or visiting spacecraft.
The ISS cabin is maintained at sea-level pressure (~760 mmHg) and comfortable temperatures (~22–24 °C) for the crew. Slight variations are normal during station activities.
Total mass reflects all consumables, equipment, and crew on board. The urine tank level tracks the water recovery system in Node 3, which recycles urine into drinking water for the crew.