Outdoor Temperature & Humidity Sensor HomeMatic HmIP-STHO Wireless Battery Powered

The HomeMatic HmIP-STHO Outdoor Temperature & Humidity Sensor is a wireless, battery-powered device designed to monitor outdoor climate conditions. Compact and weather-resistant, it measures temperature and relative humidity and transmits readings to a compatible HomeMatic IP system for remote monitoring and automation. The sensor operates on LR6 (AA) batteries and features a compact housing suitable for outdoor mounting where accurate environmental data is required.

Advantages

The HmIP-STHO provides reliable, wireless transmission of temperature and humidity data to HomeMatic IP controllers, enabling automated responses and remote monitoring. Its battery-powered operation removes the need for external wiring, while the small footprint and robust enclosure allow installation in exposed outdoor locations. CE certification indicates compliance with applicable European safety and electromagnetic standards.

Suitable for

• Monitoring garden and yard temperature and humidity
• Integrating outdoor climate data into smart home automations
• Protecting outdoor equipment by triggering alerts or actions based on conditions
• Weather-sensitive heating or ventilation control in semi-exposed spaces

Key specifications

• Measurement types: ambient temperature and relative humidity
• Power supply: LR6 (AA) batteries
• Communication: wireless connection compatible with HomeMatic IP systems
• Enclosure dimensions: 82 mm (width) × 41 mm (depth) × 59 mm (height)
• Environmental rating: designed for outdoor use with weather-resistant housing
• Certification: CE compliance

How to use

Install AA batteries, place the sensor in a sheltered outdoor location away from direct precipitation and strong sunlight for representative readings, and mount it using suitable screws or brackets. Add the device to a HomeMatic IP system following the controller’s device inclusion procedure; once paired, configure measurement intervals and automation rules in the HomeMatic IP app or central controller. Periodically check battery status and replace batteries when the system indicates low power.

Recommendations

For accurate and long-term performance, position the sensor where airflow is adequate and avoid locations with direct solar radiation or splash from sprinklers. Use alkaline LR6 (AA) batteries of reputable brands and replace them before performance degrades. Regularly verify the sensor reading against a trusted reference after extreme weather events.