Iran — Sea Water Temperature and Annual Ranges
Up-to-date sea water temperatures for the coasts of Iran. Learn about today’s conditions, monthly averages, and how the surrounding seas and oceans vary by season. We find every place where you can swim and show you the water temperature there today and throughout the year.
Sea Water Temperature Along the Coast
Chart of Average Temperature Changes Over the Last 60 Days
Places with the Warmest Sea Water Today
The Most Popular Seaside Places
Coastal Seas and Oceans
Water Temperature and Swimming Overview
Regions and Map
Water Temperature Trends
Iran has coastlines on both the Caspian Sea to the north and the Persian Gulf and Gulf of Oman to the south, and water temperatures differ markedly between these regions. On the Caspian coast, sea temperatures are cool for much of the year, typically ranging from about 5–10 °C (41–50 °F) in winter, warming through spring to roughly 8–18 °C (46–64 °F), and reaching summer highs around 20–26 °C (68–79 °F) before falling again in autumn. Along the southern shores, the Persian Gulf and Gulf of Oman are much warmer: winter waters commonly sit near 20–24 °C (68–75 °F), rise through spring to the mid‑20s °C, and peak in summer between roughly 29–36 °C (84–97 °F), with the Gulf of Oman usually a few degrees cooler than the shallower, more enclosed Persian Gulf.
Swimming Conditions
Swimming is a popular activity in Iran where local conditions permit, and many beaches and resort areas are set up for recreation during the warmer months. In the south, warm sea temperatures make swimming comfortable for much of the year, especially from late spring to early autumn; the Caspian coast sees its main swimming season in summer when waters are warmest. However, swimming access can be limited at times for safety or environmental reasons: strong currents, occasional jellyfish, poor water quality or pollution near industrial ports, and restricted military or shipping zones may close particular stretches. Visitors are advised to use designated public beaches with lifeguards when available and to check local advisories for tides, water quality, and other safety notices before entering the sea.