This study presents the first multi-decadal, ground-based characterization of the urban heat island (UHI) in Riyadh, Saudi Arabia, using a 37-year in - situ dataset (1985-2021) from urban (old Riyadh Air Base) and rural (King Khalid International Airport) meteorological stations. The analysis reveals significant warming trends at both sites, with the urban area warming faster (0.07˚C yr − 1 , p < 0.001) than the rural reference (0.050˚C yr − 1 , p < 0.001), particularly during spring and summer. The UHI intensity (UHII) increased significantly (0.02˚C yr − 1 , p < 0.01), with seasonal peaks in spring (0.02˚C yr − 1 ) and monthly maxima up to 3.03˚C (November 2017). Rapid urbanization—5.5-fold built-up expansion (350 to 1935 km 2 ), impervious cover rising from 45% to 88% in the urban core, and population growth to ~7.5 million—emerged as the dominant driver, amplified by anthropogenic heat, reduced evapotranspiration, and urban canyon effects. Interannual variability was modulated by global (Mount Pinatubo, 1992 cooling), regional (Gulf War aerosols), and local (March-May dust storms) forcings. The Mann-Kendall test confirmed significant UHII intensification in seven months, with spring exhibiting the highest variability (±0.35˚C). A multiple linear regression across 18 arid cities (R 2 = 0.81, p < 0.001) validated Riyadh’s UHII as representative, driven by impervious (+0.019˚C per %) and vegetation cover (−0.031˚C per %). These findings directly inform Saudi Vision 2030, supporting Green Riyadh and Saudi Green Initiative targets (10 million trees, 43% green coverage by 2030) through evidence-based strategies: high-albedo materials, drought-tolerant greening, and urban ventilation. By bridging a critical global gap in long-term, ground-validated UHI research in arid megacities, this study sets a new benchmark for sustainable urban resilience under accelerating climate and demographic pressures.
KeywordsMegacityUrban Heat IslandArid Climate and UrbanizationGreen Riyadh Initiative
Rahaman, S., Kalra, A. and Ahmad, S. (2022) Land-Cover Change and Urban Thermal Environment in Arid Megacities: Riyadh Case Study Using Multi-Sensor Satellite Data. International Journal of Applied Earth Observation and Geoinformation , 107, Article 102702.
Alghamdi, A.S. and Moore, T.W. (2021) Urban Heat Island Intensity and Impervious Surface Extent in Riyadh, Saudi Arabia: A 35-Year Landsat Time-Series Analysis. Remote Sensing of Environment , 264, Article 112613.
McCormick, M.P., Thomason, L.W. and Trepte, C.R. (1995) Atmospheric Effects of the Mt Pinatubo Eruption. Nature , 373, 399-404. https://doi.org/10.1038/373399a0
Hobbs, P.V. and Radke, L.F. (1992) Airborne Studies of the Smoke from the Kuwait Oil Fires. Science , 256, 987-991. https://doi.org/10.1126/science.256.5059.987
Oke, T.R., Mills, G., Christen, A. and Voogt, J.A. (2017) Urban Climates. Cambridge University Press. https://doi.org/10.1017/9781139016476
Sailor, D.J. (2011) A Review of Methods for Estimating Anthropogenic Heat and Moisture Emissions in the Urban Environment. International Journal of Climatology , 31, 189-199. https://doi.org/10.1002/joc.2106
Theeuwes, N.E., Steeneveld, G.J., Ronda, R.J. and Holtslag, A.A.M. (2017) A Diagnostic Equation for the Daily Maximum Urban Heat Island Effect. Quarterly Journal of the Royal Meteorological Society , 143, 942-950.
Li, H., Zhou, Y., Li, X., Meng, L., Wang, X., Wu, S. and Sodoudi, S. (2020) A New Method to Quantify Surface Urban Heat Islands. Remote Sensing of Environment , 248, Article 111998.
Akbari, H., Pomerantz, M. and Taha, H. (2001) Cool Surfaces and Shade Trees to Reduce Energy Use and Improve Air Quality in Urban Areas. Solar Energy , 70, 295-310. https://doi.org/10.1016/s0038-092x(00)00089-x
Santamouris, M. (2014) Cooling the Cities—A Review of Reflective and Green Roof Mitigation Technologies to Fight Heat Island and Improve Comfort in Urban Environments. Solar Energy , 103, 682-703. https://doi.org/10.1016/j.solener.2012.07.003
Konopacki, S.J. and Akbari, H. (2002) Energy Savings for Heat Island Reduction Strategies in Chicago and Houston (Including Updates for Baton Rouge, Sacramento, and Salt Lake City). Lawrence Berkeley National Laboratory.
Aflaki, A., Mirnezhad, M., Ghaffarianhoseini, A., Ghaffarianhoseini, A., et al . (2017) https://www.sciencedirect.com/science/article/abs/pii/S0264275116305303?via%3Di hub
Oke, T.R. (1982) The Energetic Basis of the Urban Heat Island. Quarterly Journal of the Royal Meteorological Society , 108, 1-24. https://doi.org/10.1002/qj.49710845502
Buyantuyev, A. and Wu, J. (2010) Urban Heat Islands and Landscape Heterogeneity: Linking Spatiotemporal Variations in Surface Temperatures to Land-Cover and Socioeconomic Patterns. Landscape Ecology , 25, 17-33. https://doi.org/10.1007/s10980-009-9402-4
Chen, B., Wang, Z., Li, Y. and Jiang, F. (2019) Remote Sensing , 11, Article 2251.
Foster, P.M.D. (2001) The Potential Negative Impacts of Global Climate Change on Tropical Montane Cloud Forests. Earth - Science Reviews , 55, 73-106. https://doi.org/10.1016/s0012-8252(01)00056-3
Martínez-Zarzoso, I. and Maruotti, A. (2011) The Impact of Urbanization on CO2 Emissions: Evidence from Developing Countries. Ecological Economics , 70, 1344-1353. https://doi.org/10.1016/j.ecolecon.2011.02.009
Lazzarini, M., Marpu, P.R. and Ghedira, H. (2019) Urban Heat Island in Kuwait City: 17-Year Modis Analysis. Remote Sensing , 11, Article 1418.
Al-Dabbas, M., Al-Hedny, M. and Abbas, M. (2021) Meta-Analysis of UHI Drivers in MENA Arid Cities. Urban Climate , 38, Article 100912.
Almazroui, M., Saeed, S., Saeed, F., Islam, M.N. and Ismail, M. (2020) Dust Impacts on Radiation and UHI in Arabian Peninsula. Journal of Geophysical Research : Atmospheres , 125, e2019JD031879.
(2021) Saudi Green Initiative. https://www.vision2030.gov.sa/en/explore/projects/saudi-green-initiative
(2021) Riyadh Green Initiative. https://riyadhgreen.sa/Home/EN
Yao, R., Cao, J., Wang, L., Zhang, J. and Wu, X. (2023) Global Analysis of Surface Urban Heat Island Intensity and Its Driving Factors. Remote Sensing of Environment , 294, Article 113613.
Aldosari, A., Al-Ghamdi, S. and Rahman, M. (2021) Climate Characteristics of Riyadh. Arabian Journal of Geosciences , 14, Article 1123.
Al-Hathloul, S. (2017) Riyadh Development Plans in the Past Fifty Years (1967-2016). Current Urban Studies , 5, 97-120. https://doi.org/10.4236/cus.2017.51007
Alqurashi, A.F. and Kumar, L. (2019) Land Use and Land Cover Change Detection in the Saudi Arabian Desert Ecosystems: A Review. Land , 8, Article 135.
Sneyers, R. (1990) On the Statistical Analysis of Series of Observations (Technical Note No. 415). World Meteorological Organization.
Yagüe, C., Zurita, E. and Martinez, A. (1991) Statistical Analysis of the Madrid Urban Heat Island. Atmospheric Environment . Part B . Urban Atmosphere , 25, 327-332. https://doi.org/10.1016/0957-1272(91)90004-x
Esteban-Parra, M.J., Pozo-Vázquez, D., Castro-Díez, Y. and Trigo, R.M. (1995) Trends in Temperature Extremes in the Iberian Peninsula. International Journal of Climatology , 15, 1381-1393.
Maghrabi, A.H. and Alotaibi, R.N. (2018) Long-Term Variations of AOD from an AERONET Station in the Central Arabian Peninsula. Theoretical and Applied Climatology , 134, 1015-1026. https://doi.org/10.1007/s00704-017-2328-x
Alsafrjalani, M., Alahmadi, M. and Atkinson, P.M. (2023) Three-Dimensional Urban Morphology and Night-Time Air Temperature in Riyadh. Building and Environment , 229, Article 109951.
Atlas of Urban Expansion (2016) Riyadh Urban Profile. Lincoln Institute of Land Policy.
Rahman, M.T. (2016) Urban Spatial Growth and Land Use Change in Riyadh: Comparing Spectral Angle Mapping and Band Ratioing Techniques. Arabian Journal of Geosciences , 9, 1-14.
Public Investment Fund (PIF) (2023) Vision 2030 Program Dashboard. https://www.pif.gov.sa/en/
MEED (2009) Riyadh Planning for a Growing Population. Middle East Economic Digest.
RCRC (2024) King Abdulaziz Project for Riyadh Public Transport. Riyadh City Rapid Transit Company.
Design Middle East (2025) Parsons Expands Footprint in Saudi Arabia with Diriyah Phase 2. https://design-middleeast.com/parsons-expands-footprint-in-saudi-arabia-with-diriyah-phase-2/
Saudi Electricity Company (SEC) (2022) Annual Statistical Booklet 2021. https://www.seec.gov.sa/en/media-center/reports/annual-report-for-2022
Al-Sadah, F., Al-Otaibi, A. And Al-Harbi, M. (2022) 19-Year UHI Trend in Doha Using Station and Reanalysis Data. Atmosphere , 13, Article 789.
Abutaleb, K., Ng, A., Ghazal, R. and Al-Hagla, K. (2021) Spatiotemporal UHI Variability in Greater Cairo (1984-2020). Sustainability , 13, Article 8987.
Salem, R., Al-Ghamdi, S. and Al-Harbi, M. (2023) Impact of Green Roof Policy on UHI Mitigation in Abu Dhabi. Sustainable Cities and Society , 89, Article 104345.
Nasser, Z., Ghedira, H. and Marpu, P.R. (2021) Extreme UHI in Dubai: Role of Artificial Landforms and High-Rise Clusters. Remote Sensing , 13, Article 4321.
Hassan, Q., Khan, M.S. and Mehmood, S. (2024) Long-Term UHI Trends in Rawalpindi, Pakistan: A 30-Year Satellite Analysis. Scientific Reports , 14, Article No. 13844.
Bounoua, L., Zhang, P., Thome, K., Masek, J., Safia, A. and Imhoff, M. (2022) Urbanization and Land Surface Temperature in Marrakesh: A Landsat Time-Series Analysis. Remote Sensing , 14, Article 3935.
Simwanda, M., Murayama, Y. and Ranagalage, M. (2021) Urban Heat Island Dynamics in Kano, Nigeria: A 20-Year Analysis. Climate , 9, Article 51.
Peng, S., Ding, Y., Liu, W. and Li, Z. (2021) Surface Urban Heat Island across East Africa: A Meta-Analysis. Climate , 9, Article 51.
Kim, S., Lee, J. and Kim, H. (2023) Urban Heat Island in U.S. Cities: A Comparative Analysis of Arid and Humid Climates. Sustainable Cities and Society , 89, Article 104324.
Yao, X., Li, Y. and Zhang, J. (2024) Urban Heat Island Growth in Low-Income Arid Nations: A Global Perspective. npj Urban Sustainability , 4, Article 198.
Hansen, J., Lacis, A., Ruedy, R. and Sato, M. (1992) Potential Climate Impact of Mount Pinatubo Eruption. Geophysical Research Letters , 19, 215-218. https://doi.org/10.1029/91gl02788
Robock, A. (2000) Volcanic Eruptions and Climate. Reviews of Geophysics , 38, 191-219. https://doi.org/10.1029/1998rg000054
Stenchikov, G.L., Hamilton, K., Ramaswamy, V., Schwarzkopf, M.D. and Robock, A. (1998) Radiative Forcing from the 1991 Mount Pinatubo Volcanic Eruption. Journal of Geophysical Research : Atmospheres , 103, 13837-13857. https://doi.org/10.1029/98jd00693
Bakan, S., Betancor, J., Chlond, A. and Grassl, H. (1991) Satellite Observations of Smoke from the Kuwait Oil Fires. Geophysical Research Letters , 18, 2253-2256.
Browning, K.A., Allam, R.J., Ballard, S.P., Barnes, R.T.H., Bennetts, D.A., Maryon, R.H., et al . (1991) Environmental Effects from Burning Oil Wells in Kuwait. Nature , 351, 363-367. https://doi.org/10.1038/351363a0
UNEP (2003) Post-Conflict Environmental Assessment: Iraq. United Nations Environment Programme.
Lelieveld, J., Beirle, S., Hörmann, C., Lawrence, M.G. and Wagner, T. (2019) Severe Atmospheric Pollution in the Middle East. Science Advances , 5, eaav3048.
Almazroui, M., Islam, M.N., Saeed, F., Alkhalaf, A.K. and Dambul, R. (2017) ENSO Influence on Temperature and Precipitation over Saudi Arabia. International Journal of Climatology , 37, 521-534.
NOAA ENSO Archive (2025) Historical El Niño Events. National Oceanic and Atmospheric Administration.
Ackerman, S.A. and Chung, H. (1992) Radiative Effects of Airborne Dust on Regional Energy Budgets. Journal of Applied Meteorology , 31, 479-492.
Albugami, S., Palmer, S., Cinnamon, J. and Meersmans, J. (2019) Dust Storm Frequency and Wind Speed in Riyadh. Atmosphere , 10, Article 766.
Tegen, I. and Lacis, A.A. (1996) Modeling of Particle Size Distribution and Its Influence on the Radiative Properties of Mineral Dust Aerosol. Journal of Geophysical Research : Atmospheres , 101, 19237-19244. https://doi.org/10.1029/95jd03610
Maghrabi, A.H. and Al-Dosari, A. (2016) Optical Properties of Dust Aerosols over Riyadh during a Major Dust Storm in March 2012. Journal of Atmospheric and Solar - Terrestrial Physics , 142, 1-8.