Indoor arenas serve a unique purpose at equine facilities, yet there has been minimal research conducted examining the internal environment within them. Survey data identified dust, moisture, temperature, and air movement as concerns of indoor arena users and one-time characterizations of 37 facilities within 100 miles of Lexington, KY demonstrated air movement below the still air threshold (100 ft/min (0.51 m/s)) for livestock facilities in 87% of the indoor arenas. To better understand the environment within indoor arenas, 15 facilities selected from the 37 facilities noted above were monitored for 1 week during both the winter and summer seasons between October 2020 and February 2022. Temperature, relative humidity, dew point, solar radiation, and air speed data were collected every 5 min using the HOBO RX3000 Remote Monitoring Station with the HOBOnet Temperature/Relative Humidity Sensor, HOBOnet Solar Radiation Sensor, and HOBOnet Ultrasonic Wind Speed and Direction Sensor. All measurements displayed a distinct diurnal pattern with clear trends for the different seasons of data collection. Conducting paired t-tests between the climate control and non-climate-controlled facilities demonstrated statistically significant differences for the winter temperature (P = 0.006), winter and summer relative humidity (P < 0.001 andP < 0.001), and winter and summer dew point temperatures (P < 0.001 and P < 0.001). Temperature, relative humidity, and dew point temperatures were higher in the climate-controlled arenas likely due to the presence of heating mechanisms and insulation. Similar to the indoor arena characterization data, the air speeds observed during the environmental monitoring for all of the indoor arenas were below the threshold for still air in livestock facilities (100 ft/min (0.51 m/s)). Solar radiation for both seasons peaked around 3 p.m., but the differences were statistically significant (P < 0.001) with a summer day experiencing an average of 10.77 Watts per square meter, compared with 6.46 Watts per square meter during the winter. This is consistent with changes in the position and intensity of the sun throughout the year though the opening of windows and doors may also impact the amount of sunlight entering the facilities. Sensor technology and implementation provides a better understanding of the interior environment and how indoor arena design can impact and improve these conditions.