虽然许多对流带已经进入尤卡坦半岛上空,但迪安仍在继续强化直至风眼登陆时止。随着风眼从科斯塔玛雅(Costa Maya)地区小镇玛哈瓦(Majahual)附近进入墨西哥上空,美国国家飓风中心估计风暴的表层风速达到每小时280公里,迪安因此成为继1992年的飓风安德鲁以来第一个以五级强度登陆的大西洋飓风[11]。与此同时,飓风风眼内一个投落送测得的数据表明其中心气压估计低至905毫巴(百帕,26.72英寸汞柱),令迪安成为继1935年劳动节飓风和1988年的颶風吉爾伯特以来登陆过的最强烈大西洋风暴,并且和飓风卡米尔与飓风米奇一起并列成为有纪录以来第七强烈的大西洋飓风[11]。迪安的登陆时间是UTC8月21日上午9点,地点在墨西哥金塔纳罗奥州人口稀少的科斯塔玛雅地区,地理坐标18.7 N 87.8 W附近,带去了高达3.7至5.5米的风暴潮[42]。该州首府切图马尔的一个气象站报告飓风登陆期间的降雨量达到170毫米[11]。正如气象部门预计的那些,登陆令迪安大幅减弱,风眼消失,顶端云层也有所回暖[43]。陆地严重破坏了风暴的组织性,到迪安穿过尤卡坦半岛时已经削弱到只有一级飓风强度[44]。
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^Jamie Rhome. August 11 Tropical Weather Outlook 21z. National Hurricane Center (报告) (National Oceanic and Atmospheric Administration). 2007-08-11.使用|accessdate=需要含有|url= (帮助)
^ 3.03.1Jamie Rhome. August 12 Tropical Weather Outlook 09z. National Hurricane Center (报告) (National Oceanic and Atmospheric Administration). 2007-08-12.使用|accessdate=需要含有|url= (帮助)
^Daniel Brown, James Franklin. August 12 Tropical Weather Outlook 21z. National Hurricane Center (报告) (National Oceanic and Atmospheric Administration). 2007-08-12.使用|accessdate=需要含有|url= (帮助)
^Daniel Brown. August 12 Tropical Weather Outlook 03z. National Hurricane Center (报告) (National Oceanic and Atmospheric Administration). 2007-08-12.使用|accessdate=需要含有|url= (帮助)
^Richard Knabb, Eric Blake. August 13 Tropical Weather Outlook 15z. National Hurricane Center (报告) (National Oceanic and Atmospheric Administration). 2007-08-13.使用|accessdate=需要含有|url= (帮助)
^Chris Landsea, Richard Knabb. Tropical Storm Dean Discussion Six. National Hurricane Center. National Oceanic and Atmospheric Administration. 2007-08-14 [2014-03-07]. (原始内容存档于2014-01-03). (页面存档备份,存于互联网档案馆)
^Lixion Avila, Eric Blake. Hurricane Dean Discussion Fourteen. National Hurricane Center. National Oceanic and Atmospheric Administration. 2007-08-16 [2014-03-07]. (原始内容存档于2014-01-03). (页面存档备份,存于互联网档案馆)
^Lixion Avila, Michelle Mainelli. Hurricane Dean Discussion Eighteen. National Hurricane Center. National Oceanic and Atmospheric Administration. 2007-08-17 [2014-03-07]. (原始内容存档于2014-01-03). (页面存档备份,存于互联网档案馆)
^Richard Pasch, Daniel Brown. Hurricane Dean Discussion Twenty Five. National Hurricane Center. National Oceanic and Atmospheric Administration. 2007-08-19 [2014-03-07]. (原始内容存档于2014-01-03). (页面存档备份,存于互联网档案馆)
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^Stuart Hinson. NCDC Event Record Details 679276. National Climate Data Center (报告) (National Oceanic and Atmospheric Administration). 2007-08-26.使用|accessdate=需要含有|url= (帮助)
^Jackson. Surface Weather Map at 7:00 A.M. E.S.T.. National Centers for Environmental Prediction, Hydrometeorological Prediction Center. National Oceanic and Atmospheric Administration. 2007-08-30 [2014-03-08]. (原始内容存档于2014-01-02). (页面存档备份,存于互联网档案馆)