Sailfish: water temperature and season

Winter fish, best November to February, off the reef edge in blue water. Anglrithm scores sailfish at offshore and reef spots on the Atlantic side and in the Keys. This page sets out what that score weighs and the cited studies behind it.

Water temperature

Evidence tier Well established

The tagged band for sailfish is 75-82 °F, with most time at 77-78 °F. NOAA puts the Florida sailfish fishery in 69-83 °F water, and the Perryman & Babcock analysis found catch peaking near 25 °C (77 °F); the band keeps its 75-82 °F core with the peak at 77-78 °F inside that range. NOAA TM NMFS-SEFSC-791; Perryman & Babcock 2017; Lam 2016; Hoolihan 2011 (evidence: weak).

The band works in both directions. Fish feed along a dome, rising to an optimum and falling away past it, so water above the band counts against an hour just as water below it does. Outside the band, either way, no hour rates GOOD in the score, and an hour loses more the further out the water is.

Season

Best Dec to Jan, by the score's season weight.

The score's season weight by month, from the studies cited in the species profile; the outlined months are at 90% of its peak or better.

What the score weighs

  • SeasonWell establishedkeeps 100%
  • WindSmall real effectkeeps 50%
  • Wind directionSmall real effectkeeps 50%
  • SeasSmall real effectkeeps 50%
  • Water tempWell establishedkeeps 100%
  • BarometerPopular belief, not supportedkeeps 20%Labelled not supported: it stays visible, discounted, and is never promoted.
  • CurrentSmall real effectkeeps 50%
  • Wind vs currentSmall real effectkeeps 50%
Why each tier
  • Season: Season is the strongest single predictor in most recreational datasets, because it carries water temperature, migration and spawning together. Shaw et al. 2021, PLOS ONE 16:e0257882.
  • Wind: Wind has a measurable effect on fish movement, apparently through dissolved oxygen, but it is small. The larger effect in any personal log is on you: wind decides where you can fish and whether you go at all, so a wind pattern in your own data is at least as likely to be about your choices as about the fish. Milardi et al. 2019, Aquatic Ecology 53:251-263. Shaw et al. 2021, PLOS ONE 16:e0257882.
  • Seas: Sea state mostly decides whether the trip happens and whether you can fish it well. Treat a sea-state pattern in your own log as a fact about your fishing, not about the fish. No direct angling-scale study found; labelled from mechanism.
  • Water temp: Fish are ectotherms, so appetite and digestion track water temperature along a dome: rising to an optimum, then falling away again. Warmer is not simply better. Snook energy demand roughly tripled from 15 to 25 C, and they were more likely to have empty stomachs when the water ran hot. Volkoff & Ronnestad 2020, Temperature 7:307-320. White et al. 2025, Marine and Coastal Fisheries 17:vtaf031, doi:10.1093/mcfafs/vtaf031.
  • Barometer: A 30 hPa swing, which is about the biggest front of the year, is the same pressure change a fish feels by swimming down a foot. The direct feeding experiment on yellow perch found no significant influence, and thirteen years of angler data did not surface pressure trend as a meaningful predictor. It is also unidentifiable in principle from a catch log, because the barometer moves with the wind, the cloud and the temperature. VanderWeyst 2013, Bemidji State University. Shaw et al. 2021, PLOS ONE 16:e0257882.
  • Current: No study we found ties a current speed or direction to catch for any fish in this app. Current decides whether you can hold a bait where you want it and how a drift sets up: off Southeast Florida the Gulf Stream runs fast close to the coast, and deep-drop boats stay under power to hold position. Treat a current pattern as a fact about your fishing more than about the fish. Davis, Cudney & Blankinship 2017, Bulletin of Marine Science 93:539-555. Lerner et al. 2013, Transactions of the American Fisheries Society 142:95-104.
  • Wind vs current: Wind blowing against the current stands the seas up: shorter, steeper and more likely to break than the same wind over slack water, which decides how a drift sets up and how long a day stays fishable. That is physics about the water, not evidence about the fish; no study we found ties it to catch. U.S. Coast Pilot 4, Chapter 3 (opposing wind and current on the Gulf Stream: sharply higher, steeper seas that can break; mechanism only). No catch study found.

Each factor's weight is multiplied by its evidence tier: well established and real but local keep all of it, a small real effect keeps half, and a popular belief that is not supported keeps a fifth. Guidance from the studies sits beside the score, never in it.

From the research programs

  • Sailfish spawn in the Straits of Florida from about late April to late September, peaking around mid-July. The Billfish Foundation, 2009
  • Researchers estimate around 13 percent of the western Atlantic sailfish stock passes through the Straits of Florida during spawning season. The Billfish Foundation, 2009
  • Tagged sailfish spent most daylight hours in the top 66 ft, making short feeding dives to roughly 164 to 492 ft. Nova Southeastern University, 2011
  • Billfish Foundation records show sailfish tagging peaks February through April, then falls off sharply in May. The Billfish Foundation, 2020A tagging record, not a catch rate. The score's own season weight for sailfish: Best Dec to Jan.
  • Florida sailfish recaptures show fish ranging up and down the South Florida coast, some heading south into the Caribbean past the Keys. The Billfish Foundation, 2020
  • A sailfish tagged off Miami Beach was recaptured off Fort Pierce 189 days later; another moved Key Biscayne to Conch Reef in 14 days. NOAA Fisheries, 2022
  • ICCAT's first sailfish assessment, in 2009, found the western Atlantic stock overfished; the 2016 assessment found no clear trend since 1990 until the last few years, and Billfish Foundation tag records also show no clear trend. The Billfish Foundation, 2018

Findings in our own words from the programs linked, area and season only; cited, not endorsed. None of these lines is in the score.

The studies

  • Tagged tuna, marlin and sailfish spent much of their time on ocean fronts and eddy edges, including the Florida Current edge.

    Gulf of Mexico and western North Atlantic (outside South Florida) · field · full text read

    Luo et al. 2015

  • Billfish and swordfish spawn in summer offshore Gulf water, with larvae densest near the Loop Current edge and fronts.

    northern Gulf of Mexico slope, Alabama to Texas (out of region) (outside South Florida) · field · full text read

    Rooker et al. 2012

  • Per ocean boat trip, east Florida dolphin catch peaks May-June; wahoo and blackfin peak September-December.

    Florida Atlantic coast (MRIP South Atlantic Florida, excludes Monroe County) · agency · agency document

    NOAA Fisheries Marine Recreational Information Program 2025

The whole evidence library

Entries read in full text or published by an agency. Entries read only in their abstract are listed on the science page with their numbers withheld.

Where it is scored

Today's score at any of them is free with an account; every fish has a page like this one.

Display only, not for navigation. Every figure here names its source; check the NWS marine forecast and the posted rules before you leave the dock.