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[[Sungai Urauchi]] di Pulau Iriomote adalah sungai terbesar di Prefektur Okinawa. {{nihongo|Sungai Nakama|仲間川|Nakama-gawa}} yang lebih kecil juga mengalir di pulau ini. Aur Terjun Pinaisara di Iriomote adalah air terjun terbesar di Prefektur Okinawa.<ref>{{cite web|url=http://www.env.go.jp/en/nature/nps/park/parks/iriomote.html |title=Introducing places of interest: Iriomote-Ishigaki National Park (Iriomote) |publisher=[[Kementerian Lingkungan Hidup (Jepang)|Kementerian Lingkungan Hidup]] |date= |accessdate=2012-6-11}}</ref>
Iriomote [[iklim hutan hujan tropis|beriklim hutan hujan tropis]] ([[klasifikasi iklim Köppen]] ''Af''). Temperatur tahunan rata-rata 23,4°C, dan temperatur bulanan rata-rata berkisar antara 18,5°C pada bulan Januari dan 28,4°C pada bulan Juli. Curah hujan rata-rata di Iriomote sekitar 2.500 mm. Musim taifun di Iriomote biasanya dari bulan Juni hingga September.
<div style="width:70%;">
{{Weather box
|location = Iriomote
|single line = Y
|metric first = Y
|Jan high C = 20.2
|Feb high C = 20.8
|Mar high C = 22.7
|Apr high C = 25.7
|May high C = 28.2
|Jun high C = 29.9
|Jul high C = 31.5
|Aug high C = 31.1
|Sep high C = 30.1
|Oct high C = 27.6
|Nov high C = 24.7
|Dec high C = 21.8
|Jan mean C = 17.6
|Feb mean C = 18.1
|Mar mean C = 19.8
|Apr mean C = 22.6
|May mean C = 25.2
|Jun mean C = 27.2
|Jul mean C = 28.4
|Aug mean C = 28.0
|Sep mean C = 27.0
|Oct mean C = 24.9
|Nov mean C = 22.1
|Dec mean C = 19.1
|Jan low C = 15.2
|Feb low C = 15.6
|Mar low C = 17.2
|Apr low C = 19.8
|May low C = 22.6
|Jun low C = 24.8
|Jul low C = 25.7
|Aug low C = 25.2
|Sep low C = 24.3
|Oct low C = 22.4
|Nov low C = 19.8
|Dec low C = 16.7
|precipitation colour = green
|Jan precipitation mm = 172.3
|Feb precipitation mm = 161.4
|Mar precipitation mm = 153.2
|Apr precipitation mm = 163.6
|May precipitation mm = 210.6
|Jun precipitation mm = 196.1
|Jul precipitation mm = 193.2
|Aug precipitation mm = 244.4
|Sep precipitation mm = 248.1
|Oct precipitation mm = 222.8
|Nov precipitation mm = 224.1
|Dec precipitation mm = 152.9
|Jan humidity = 78
|Feb humidity = 81
|Mar humidity = 82
|Apr humidity = 83
|May humidity = 86
|Jun humidity = 86
|Jul humidity = 85
|Aug humidity = 86
|Sep humidity = 85
|Oct humidity = 80
|Nov humidity = 80
|Dec humidity = 78
|Jan sun = 63.6
|Feb sun = 63.9
|Mar sun = 91.3
|Apr sun = 122.7
|May sun = 134.1
|Jun sun = 173.4
|Jul sun = 231.3
|Aug sun = 201.5
|Sep sun = 167.9
|Oct sun = 131.4
|Nov sun = 75.7
|Dec sun = 68.5
|source 1 = NOAA (1961-1990) <ref name= NOAA>{{cite web
|url = ftp://dossier.ogp.noaa.gov/GCOS/WMO-Normals/RA-II/JP/47917.TXT
|title = Iriomotejima Climate Normals 1961-1990
|publisher = [[National Oceanic and Atmospheric Administration]]
|accessdate = January 9, 2013}}</ref>
|date=January 2013}}
</div>
== Fauna ==
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