Sea Surface Temperature Map for Offshore Fishing

Sea surface temperature is the single best piece of intel you can pull up before you leave the dock. Bait stacks up where warm and cold water meet — a break of a degree or two can hold more life than fifty miles of flat, uniform water on either side of it. The map above shows you that water in color, built from the same satellites that watch the whole ocean every day, so you can find the break before you burn fuel looking for it.

Two Kinds of Data, One Map

Two different things feed this map, and it's worth knowing which one you're looking at. The color you see by default is a composite — one blended picture built from MUR, the Multi-scale Ultra-high Resolution sea surface temperature analysis that NASA publishes once a day. MUR fills in the clouds and gaps between satellite passes by combining several instruments and a bit of modeling, so it always shows the whole ocean, but it's a best estimate rather than a direct reading, and it's roughly a day old by the time it's published.

The other option is a raw satellite pass — one specific overflight, at one specific time, with the real cloud gaps left in instead of smoothed over. Those come from ACSPO, the processing NOAA runs on raw infrared readings to turn them into a temperature grid, applied to VIIRS, an instrument flown on the S-NPP, NOAA-20, and NOAA-21 satellites (S-NPP is short for Suomi National Polar-orbiting Partnership — one of three near-identical satellites sharing the same orbit). A pass can be a few hours old instead of a full day, and because nothing has been filled in, you're looking at exactly what the satellite saw, gaps and all.

Both live on the same map, and you can switch between them from the source picker in the map toolbar without leaving the page. There's no guessing which one you're looking at, either — every reading on this map carries its own timestamp and satellite name, so you know exactly how fresh it is before you plan around it.

What Your Account Sees

What you get depends on your account. Browsing without signing in, you're seeing composites held back at least 48 hours — current enough to tell you where a break has been sitting, not current enough to run out on today. Create a free account and that same composite becomes fully current, updated as soon as each day's data is published. A paid plan is what unlocks the raw satellite passes described above, plus buoy readings and temperature and chlorophyll alerts for the region or regions your plan covers.

Who This Is For

This map is built for people who fish offshore for a living or for the day — captains, mates, and private boaters planning a trip — and it holds up for anyone doing marine science, for the same reason: it never hides how old a reading is or which satellite it came from. If a number on this map matters to your trip, you can always find out exactly where it came from.

Two regions worth a closer look if you're new to reading breaks: the Gulf Stream, where warm and cold water meet in one of the sharpest edges anywhere in the ocean, and Southern California, where migrating yellowtail famously ride the seasonal warm-water push north — the subject of our article on migrating and resident yellowtail.