Radiofrequency (RF) is a new therapeutic option that may aid one of the pathophysiological mechanisms of stress urinary incontinence (SUI), which is a decrease in collagen in the urethral walls. This study aimed to verify the clinical response to nonablative RF treatment for SUI in women. This randomized clinical trial included women with SUI, randomized into two groups: the RF group (RG), which had five sessions of outpatient kinesiotherapy associated with monopolar nonablative RF, in the external urethral meatus (39–41°C) for 2 min, and the control group (CG), which followed the same protocol, except the RF was replaced with heated glycerin. All participants performed home exercises. Outcomes were assessed one week after treatment completion. The RG and CG had 13 and 9 women, respectively. The median reduced from 7.0 (4.5–14.5) to 1.0 (0.0–4.0) in the RG. In addition, a reduction in urinary loss was observed through a voiding diary, an increase in strength, endurance, resistance, and speed of the PERFECT scheme. There was a reduction in urinary loss in grams in women who underwent nonablative RF in the external urethral meatus.