Yes. Notion sensors are not water proof but they are water resistant. Also, Notion sensors do not work at temperatures below 0-degrees Fahrenheit. Colder temperatures could also adversely impact sensor battery life. If your outdoor environment is warm and dry enough, then Notion sensors should work outside. They are UV resistant too.
Temperature rating: 0-degrees F to 175-degrees F
Water Resistance: Submersion to 3ft for 30 minutes (Sensor signal will be attenuated if submerged under water.)
Sensor is dust resistant.