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Lake Jesup algae history from satellite

We read Lake Jesup from 394 cloud-free satellite scenes between Apr 14, 2016 – Oct 1, 2026. Here is what the surface water showed.

Clear scenes
394
Typical (median), index
174
Highest reading
429 · May 14, 2016
Latest scene
164 · Oct 1, 2026

Algae signal (red-edge index) over time

02004006002017201820192020202120222023202420252026Apr 14, 2016: 334 index (high)May 14, 2016: 429 index (high)Jun 23, 2016: 349 index (high)Jul 13, 2016: 357 index (high)Aug 2, 2016: 399 index (high)Aug 22, 2016: 367 index (high)Sep 11, 2016: 238 index (high)Oct 1, 2016: 227 index (high)Oct 21, 2016: 111 index (high)Nov 10, 2016: 79 index (high)Nov 20, 2016: 83 index (high)Feb 8, 2017: 169 index (high)Mar 10, 2017: 211 index (high)Mar 30, 2017: 283 index (high)Apr 19, 2017: 312 index (high)May 9, 2017: 373 index (high)Jun 18, 2017: 272 index (high)Aug 17, 2017: 189 index (high)Sep 21, 2017: 64 index (low)Sep 26, 2017: 38 index (low)Oct 16, 2017: 34 index (low)Oct 31, 2017: 25 index (low)Nov 30, 2017: 27 index (low)Dec 10, 2017: 38 index (low)Dec 30, 2017: 54 index (high)Jan 4, 2018: 67 index (high)Jan 9, 2018: 57 index (high)Jan 24, 2018: 74 index (high)Feb 18, 2018: 93 index (high)Feb 28, 2018: 170 index (high)Mar 5, 2018: 221 index (high)Mar 15, 2018: 252 index (high)Mar 25, 2018: 223 index (high)Apr 4, 2018: 227 index (high)Apr 9, 2018: 232 index (high)Apr 19, 2018: 224 index (high)Apr 24, 2018: 211 index (high)Apr 29, 2018: 212 index (high)May 4, 2018: 258 index (high)May 9, 2018: 224 index (high)May 24, 2018: 183 index (high)Jun 8, 2018: 196 index (high)Jun 18, 2018: 223 index (low)Jun 23, 2018: 188 index (low)Jun 28, 2018: 186 index (low)Jul 3, 2018: 110 index (high)Jul 13, 2018: 69 index (low)Aug 7, 2018: 68 index (high)Aug 12, 2018: 65 index (high)Aug 17, 2018: 62 index (high)Aug 27, 2018: 63 index (high)Sep 1, 2018: 81 index (low)Sep 6, 2018: 103 index (low)Sep 11, 2018: 74 index (high)Sep 16, 2018: 94 index (high)Sep 21, 2018: 92 index (high)Sep 26, 2018: 101 index (high)Oct 6, 2018: 134 index (high)Oct 16, 2018: 124 index (high)Oct 21, 2018: 128 index (high)Oct 31, 2018: 183 index (high)Nov 10, 2018: 196 index (high)Nov 15, 2018: 191 index (high)Nov 25, 2018: 177 index (high)Dec 5, 2018: 147 index (high)Dec 25, 2018: 154 index (high)Jan 29, 2019: 186 index (high)Feb 8, 2019: 186 index (high)Feb 23, 2019: 129 index (high)Mar 10, 2019: 129 index (high)Mar 15, 2019: 150 index (high)Mar 20, 2019: 136 index (high)Mar 25, 2019: 121 index (high)Apr 4, 2019: 131 index (high)Apr 9, 2019: 152 index (high)Apr 24, 2019: 178 index (high)Apr 29, 2019: 197 index (low)May 19, 2019: 219 index (high)May 29, 2019: 265 index (low)Jun 3, 2019: 257 index (high)Jun 28, 2019: 217 index (low)Jul 28, 2019: 152 index (high)Aug 2, 2019: 167 index (high)Aug 12, 2019: 165 index (high)Aug 22, 2019: 136 index (high)Aug 27, 2019: 125 index (high)Sep 1, 2019: 146 index (high)Sep 11, 2019: 101 index (low)Sep 16, 2019: 132 index (high)Sep 21, 2019: 113 index (high)Sep 26, 2019: 117 index (high)Oct 1, 2019: 131 index (high)Oct 11, 2019: 116 index (high)Oct 26, 2019: 129 index (high)Nov 10, 2019: 123 index (high)Nov 20, 2019: 123 index (high)Nov 30, 2019: 153 index (high)Dec 5, 2019: 149 index (high)Dec 10, 2019: 157 index (high)Dec 15, 2019: 165 index (high)Dec 25, 2019: 160 index (high)Jan 9, 2020: 137 index (high)Jan 14, 2020: 137 index (high)Jan 24, 2020: 180 index (high)Feb 3, 2020: 215 index (high)Feb 8, 2020: 185 index (high)Feb 18, 2020: 242 index (high)Feb 23, 2020: 243 index (high)Feb 28, 2020: 164 index (high)Mar 4, 2020: 224 index (high)Mar 14, 2020: 298 index (high)Mar 19, 2020: 251 index (high)Mar 24, 2020: 267 index (high)Mar 29, 2020: 158 index (high)Apr 3, 2020: 79 index (high)Apr 8, 2020: 103 index (low)Apr 13, 2020: 132 index (low)Apr 28, 2020: 194 index (low)May 3, 2020: 215 index (high)Jun 17, 2020: 169 index (high)Jun 22, 2020: 169 index (high)Jun 27, 2020: 183 index (high)Jul 7, 2020: 230 index (low)Jul 12, 2020: 220 index (low)Jul 17, 2020: 183 index (low)Jul 27, 2020: 215 index (high)Aug 1, 2020: 208 index (high)Aug 11, 2020: 187 index (high)Aug 16, 2020: 179 index (high)Aug 26, 2020: 170 index (high)Sep 5, 2020: 127 index (high)Sep 25, 2020: 122 index (high)Oct 15, 2020: 98 index (high)Oct 25, 2020: 91 index (high)Oct 30, 2020: 96 index (high)Nov 4, 2020: 106 index (high)Nov 24, 2020: 67 index (high)Nov 29, 2020: 94 index (high)Dec 9, 2020: 96 index (high)Dec 19, 2020: 90 index (high)Dec 29, 2020: 80 index (high)Jan 18, 2021: 130 index (high)Jan 28, 2021: 134 index (high)Feb 2, 2021: 145 index (high)Feb 22, 2021: 224 index (high)Feb 27, 2021: 266 index (high)Mar 4, 2021: 189 index (high)Mar 9, 2021: 229 index (high)Mar 14, 2021: 275 index (high)Mar 19, 2021: 207 index (high)Mar 24, 2021: 272 index (high)Apr 8, 2021: 293 index (high)Apr 13, 2021: 251 index (high)Apr 23, 2021: 228 index (high)Apr 28, 2021: 255 index (high)May 3, 2021: 244 index (high)May 8, 2021: 252 index (high)May 23, 2021: 248 index (high)May 28, 2021: 319 index (high)Jun 27, 2021: 226 index (low)Jul 2, 2021: 225 index (low)Jul 22, 2021: 178 index (high)Jul 27, 2021: 162 index (high)Aug 6, 2021: 173 index (high)Aug 21, 2021: 196 index (high)Sep 15, 2021: 238 index (high)Sep 25, 2021: 203 index (high)Sep 30, 2021: 120 index (high)Oct 5, 2021: 131 index (high)Oct 10, 2021: 172 index (high)Oct 15, 2021: 201 index (high)Oct 20, 2021: 156 index (high)Oct 30, 2021: 159 index (high)Nov 14, 2021: 120 index (high)Nov 19, 2021: 113 index (high)Nov 24, 2021: 136 index (high)Nov 29, 2021: 132 index (high)Dec 4, 2021: 168 index (high)Dec 9, 2021: 180 index (low)Dec 14, 2021: 135 index (high)Dec 24, 2021: 187 index (high)Dec 29, 2021: 162 index (high)Jan 3, 2022: 159 index (high)Jan 8, 2022: 184 index (high)Jan 13, 2022: 176 index (high)Jan 18, 2022: 191 index (high)Feb 2, 2022: 200 index (high)Feb 12, 2022: 248 index (high)Feb 22, 2022: 253 index (high)Feb 27, 2022: 312 index (high)Mar 4, 2022: 288 index (high)Mar 19, 2022: 192 index (high)Mar 29, 2022: 114 index (high)Apr 3, 2022: 105 index (high)Apr 8, 2022: 102 index (low)Apr 23, 2022: 171 index (low)May 8, 2022: 202 index (low)May 13, 2022: 202 index (high)May 18, 2022: 206 index (high)Jun 2, 2022: 277 index (low)Jun 7, 2022: 255 index (high)Jun 12, 2022: 281 index (low)Jun 27, 2022: 285 index (high)Jul 7, 2022: 268 index (high)Jul 12, 2022: 284 index (high)Jul 22, 2022: 283 index (high)Jul 27, 2022: 231 index (high)Aug 1, 2022: 262 index (high)Aug 21, 2022: 316 index (high)Aug 26, 2022: 276 index (high)Aug 31, 2022: 217 index (high)Sep 10, 2022: 179 index (high)Sep 15, 2022: 170 index (high)Sep 20, 2022: 120 index (high)Sep 30, 2022: 87 index (high)Oct 5, 2022: 54 index (high)Oct 10, 2022: 43 index (low)Oct 15, 2022: 23 index (low)Oct 25, 2022: 20 index (low)Oct 30, 2022: 27 index (low)Nov 14, 2022: 35 index (low)Nov 29, 2022: 27 index (low)Dec 4, 2022: 27 index (low)Dec 9, 2022: 33 index (low)Dec 14, 2022: 33 index (low)Dec 19, 2022: 36 index (low)Dec 24, 2022: 37 index (low)Dec 29, 2022: 33 index (low)Jan 3, 2023: 39 index (low)Jan 8, 2023: 61 index (high)Jan 28, 2023: 90 index (high)Feb 7, 2023: 87 index (high)Feb 17, 2023: 151 index (high)Feb 22, 2023: 247 index (high)Feb 27, 2023: 282 index (high)Mar 9, 2023: 218 index (high)Mar 14, 2023: 178 index (high)Mar 24, 2023: 247 index (high)Mar 29, 2023: 196 index (high)Apr 13, 2023: 185 index (high)Apr 18, 2023: 160 index (high)Apr 23, 2023: 179 index (high)May 3, 2023: 156 index (low)May 8, 2023: 140 index (high)May 13, 2023: 178 index (high)May 18, 2023: 195 index (high)May 28, 2023: 166 index (high)Jun 2, 2023: 243 index (low)Jun 7, 2023: 177 index (low)Jun 27, 2023: 202 index (low)Jul 22, 2023: 216 index (low)Aug 1, 2023: 185 index (high)Aug 6, 2023: 224 index (low)Aug 11, 2023: 183 index (high)Aug 16, 2023: 176 index (high)Aug 21, 2023: 190 index (high)Aug 26, 2023: 184 index (high)Aug 31, 2023: 197 index (high)Sep 5, 2023: 180 index (high)Sep 10, 2023: 170 index (high)Sep 15, 2023: 173 index (high)Sep 20, 2023: 161 index (high)Oct 5, 2023: 118 index (high)Oct 15, 2023: 114 index (high)Oct 20, 2023: 114 index (high)Oct 30, 2023: 112 index (high)Nov 9, 2023: 159 index (high)Nov 19, 2023: 114 index (high)Nov 29, 2023: 93 index (high)Dec 9, 2023: 104 index (high)Dec 19, 2023: 97 index (high)Feb 2, 2024: 140 index (high)Feb 7, 2024: 127 index (high)Feb 12, 2024: 145 index (high)Feb 22, 2024: 163 index (high)Feb 27, 2024: 156 index (high)Mar 8, 2024: 154 index (high)Mar 18, 2024: 199 index (high)Apr 2, 2024: 252 index (high)Apr 7, 2024: 232 index (high)Apr 12, 2024: 190 index (high)Apr 17, 2024: 224 index (high)Apr 22, 2024: -1,953 index (low)May 2, 2024: 304 index (high)May 7, 2024: 268 index (high)May 22, 2024: 279 index (low)May 27, 2024: 238 index (low)Jun 16, 2024: 206 index (high)Jun 26, 2024: 190 index (high)Jul 1, 2024: 223 index (low)Jul 6, 2024: 198 index (high)Jul 16, 2024: 227 index (high)Jul 21, 2024: 242 index (high)Jul 26, 2024: 175 index (high)Aug 25, 2024: 254 index (high)Aug 30, 2024: 223 index (high)Sep 24, 2024: 67 index (high)Sep 29, 2024: 116 index (high)Oct 4, 2024: 94 index (high)Oct 14, 2024: 54 index (high)Oct 19, 2024: 67 index (high)Oct 24, 2024: 41 index (low)Oct 29, 2024: 47 index (low)Nov 8, 2024: 30 index (low)Nov 13, 2024: 69 index (high)Nov 23, 2024: 54 index (high)Nov 28, 2024: 54 index (high)Dec 3, 2024: 56 index (high)Jan 2, 2025: 77 index (high)Jan 12, 2025: 91 index (high)Jan 17, 2025: 91 index (high)Feb 6, 2025: 106 index (high)Feb 21, 2025: 114 index (high)Feb 26, 2025: 147 index (high)Mar 3, 2025: 148 index (high)Mar 8, 2025: 84 index (high)Mar 13, 2025: 147 index (high)Mar 18, 2025: 135 index (high)Apr 2, 2025: 235 index (high)Apr 7, 2025: 210 index (high)Apr 12, 2025: 174 index (high)Apr 17, 2025: 284 index (high)Apr 27, 2025: 287 index (high)May 9, 2025: 178 index (high)May 17, 2025: 161 index (low)May 29, 2025: 211 index (high)Jun 1, 2025: 191 index (high)Jun 18, 2025: 239 index (high)Jun 26, 2025: 270 index (high)Jul 1, 2025: 265 index (low)Jul 6, 2025: 265 index (low)Jul 11, 2025: 244 index (high)Jul 21, 2025: 246 index (low)Jul 26, 2025: 206 index (high)Jul 28, 2025: 234 index (high)Jul 31, 2025: 230 index (high)Aug 5, 2025: 215 index (high)Aug 10, 2025: 228 index (high)Aug 15, 2025: 193 index (high)Aug 20, 2025: 189 index (high)Sep 6, 2025: 202 index (high)Sep 14, 2025: 167 index (high)Sep 19, 2025: 140 index (high)Sep 24, 2025: 145 index (high)Sep 26, 2025: 131 index (high)Oct 4, 2025: 161 index (high)Oct 14, 2025: 110 index (high)Oct 16, 2025: 109 index (high)Oct 19, 2025: 109 index (high)Oct 24, 2025: 97 index (high)Oct 29, 2025: 83 index (high)Nov 3, 2025: 84 index (high)Nov 5, 2025: 91 index (high)Nov 8, 2025: 84 index (high)Nov 13, 2025: 72 index (high)Nov 18, 2025: 70 index (high)Nov 23, 2025: 71 index (low)Nov 25, 2025: 76 index (high)Nov 28, 2025: 73 index (high)Dec 23, 2025: 100 index (high)Dec 28, 2025: 122 index (high)Jan 17, 2026: 144 index (high)Jan 27, 2026: 135 index (high)Feb 1, 2026: 143 index (high)Feb 6, 2026: 154 index (high)Feb 21, 2026: 235 index (high)Feb 26, 2026: 214 index (high)Mar 8, 2026: 238 index (high)Mar 15, 2026: 272 index (high)Mar 18, 2026: 153 index (high)Mar 28, 2026: 242 index (high)Apr 4, 2026: 231 index (high)Apr 12, 2026: 200 index (high)Apr 17, 2026: 247 index (high)Apr 24, 2026: 275 index (high)May 7, 2026: 238 index (high)May 14, 2026: 308 index (high)May 22, 2026: 366 index (high)Jun 11, 2026: 370 index (high)Jun 21, 2026: 322 index (high)Jun 23, 2026: 312 index (low)Jun 26, 2026: 270 index (high)Jul 11, 2026: 267 index (high)Jul 16, 2026: 233 index (high)Jul 21, 2026: 204 index (low)Jul 26, 2026: 225 index (high)Aug 15, 2026: 222 index (high)Aug 20, 2026: 283 index (high)Aug 22, 2026: 256 index (high)Aug 30, 2026: 235 index (high)Sep 9, 2026: 190 index (high)Sep 11, 2026: 170 index (high)Sep 14, 2026: 208 index (high)Oct 1, 2026: 164 index (high)
Algae signal (red-edge index), index. One dot per cloud-free scene; dates are local to the lake.

When it peaks

MonthClear scenesMedian, indexScenes rated high
Jan2113495%
Feb33169100%
Mar36209100%
Apr3921182%
May3023180%
Jun2823261%
Jul3222666%
Aug3819297%
Sep3713186%
Oct4011080%
Nov338485%
Dec2710070%

By year (median / highest): 2016: 334 / 429 (11 scenes) · 2017: 116 / 373 (14 scenes) · 2018: 154 / 258 (41 scenes) · 2019: 149 / 265 (35 scenes) · 2020: 170 / 298 (40 scenes) · 2021: 189 / 319 (41 scenes) · 2022: 181 / 316 (46 scenes) · 2023: 176 / 282 (43 scenes) · 2024: 163 / 304 (37 scenes) · 2025: 147 / 287 (53 scenes) · 2026: 235 / 370 (33 scenes).

What a satellite can and can’t tell you

Satellites see only the surface layer, only on cloud-free days, and only away from the shoreline. They estimate algae; they do not measure toxins, and they can’t see what the lake bottom is doing. A clear reading is not a safety clearance.

For current conditions and health advisories, check the Florida DEP algal bloom page and the Florida Department of Health. If a person or pet may have been exposed to a bloom, call a doctor, a veterinarian, or Poison Help at 1-800-222-1222.

Source: Sentinel-2 MSI (ESA Copernicus), Red-edge cyanobacteria index (CI-cyano); a scene counts as a bloom when the index is above 50 and stays high relative to turbidity (bloom rule v1 (2026-10)). Snapshot exported Oct 9, 2026.

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