Arid regions face intense sunlight, leading to heightened ultraviolet (UV) radiation levels. Growing concerns about skin cancer, premature aging, and dermatological issues highlight the need to understand UVA and UVB exposure patterns. Surprisingly, no study has investigated UVA and UVB irradiance in the Arab region. Our study fills this gap by examining UVA and UVB distributions across major Saudi Arabian cities, assessing their impact on public health and the environment. We employed a multiscale trend analysis, incorporating linear, Mann-Kendall Test (MKT), Innovative Trend Analysis (ITA), and Continuous Wavelet Coherence methods. Our findings reveal alarming UV levels: UVA exceeds the critical limit (11 W/m(2)) and rises to > 18 W/m(2) during February-October, posing a risk of critical diseases. UVB also surpasses the extreme limit of 0.30 W/m(2) during March-October in all cities. Notably, Dammam experiences lower UVA and UVB exposure compared to other cities. MKT revealed that annual UVA change rate ranged from - 0.014 (Dammam) to 0.027 (Madinah) W/m(2)/month/year, ITA slope suggests a rate between - 0.005495 and - 0.0246 W/m(2)/month/year over last two decades. Overall study underscores the importance of accurate UV exposure assessments in arid regions. By identifying areas with high UVA and UVB levels, policymakers can develop targeted strategies to mitigate environmental impacts and safeguard public health.