Global Marine Heatwave & Ocean Temperature Watch

Explore the snapshot

Click any ocean location to identify NOAA's category for that 0.05° grid cell. Pan and zoom for geographic context.

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Choose a location

Click the map to read the source pixel. Category is not a temperature in degrees.

NOAA category key

No heatwaveClimatology ice1 · Moderate2 · Strong3 · Severe4 · Extreme5 · Beyond extremeLand

What is mapped

NOAA applies the Hobday marine-heatwave method to its gap-free daily CoralTemp sea-surface-temperature analysis. A marine heatwave occurs where SST exceeds the location's daily 90th-percentile threshold; intensity determines Categories 1–5.

This is a dated October 18, 2026 snapshot—not a live feed, forecast, measured local temperature, or operational advisory.

Limits

The global raster is 5 km (0.05°) and represents nighttime sea-surface-temperature analysis. Category does not equal degrees Celsius. NOAA's climatology ice mask is static and does not show daily sea ice. Do not use this map for navigation, fisheries, coral-bleaching response, or personal safety.

Sources

NOAA Marine Heatwave Watch
NOAA 5 km methodology
Dated NOAA pixel image
Source and use notes