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Lake Kissimmee algae history from satellite

We read Lake Kissimmee from 422 cloud-free satellite scenes between Apr 14, 2016 – Sep 24, 2026. Here is what the surface water showed.

Clear scenes
422
Typical (median), index
67
Highest reading
202 · Jun 18, 2025
Latest scene
86 · Sep 24, 2026

Algae signal (red-edge index) over time

01002003002017201820192020202120222023202420252026Apr 14, 2016: 56 index (low)May 14, 2016: 88 index (low)Jun 23, 2016: 111 index (high)Jul 13, 2016: 138 index (high)Aug 2, 2016: 109 index (high)Aug 22, 2016: 57 index (high)Sep 11, 2016: 48 index (low)Oct 21, 2016: 34 index (low)Nov 10, 2016: 35 index (low)Nov 20, 2016: 43 index (low)Nov 30, 2016: 42 index (low)Dec 30, 2016: 39 index (low)Feb 18, 2017: 49 index (low)Mar 10, 2017: 73 index (high)Mar 30, 2017: 104 index (low)Apr 19, 2017: 131 index (low)May 9, 2017: 145 index (low)May 29, 2017: 137 index (high)Aug 12, 2017: 76 index (low)Aug 17, 2017: 55 index (high)Sep 21, 2017: 34 index (low)Sep 26, 2017: 25 index (low)Oct 16, 2017: 16 index (low)Nov 20, 2017: 21 index (low)Nov 25, 2017: 12 index (low)Nov 30, 2017: 16 index (low)Dec 10, 2017: 25 index (low)Dec 15, 2017: 14 index (low)Dec 20, 2017: 20 index (low)Dec 30, 2017: 16 index (low)Jan 4, 2018: 30 index (low)Jan 24, 2018: 28 index (low)Feb 18, 2018: 29 index (low)Feb 23, 2018: 36 index (low)Feb 28, 2018: 48 index (low)Mar 5, 2018: 51 index (high)Mar 15, 2018: 61 index (high)Mar 25, 2018: 85 index (high)Mar 30, 2018: 108 index (high)Apr 4, 2018: 103 index (high)Apr 9, 2018: 113 index (low)Apr 14, 2018: 124 index (low)Apr 19, 2018: 110 index (low)Apr 24, 2018: 124 index (low)May 4, 2018: 139 index (low)May 9, 2018: 134 index (low)May 24, 2018: 86 index (high)Jun 8, 2018: 120 index (high)Jun 18, 2018: 113 index (high)Jun 23, 2018: 113 index (low)Jun 28, 2018: 150 index (low)Jul 3, 2018: 114 index (high)Jul 13, 2018: 83 index (high)Jul 23, 2018: 135 index (low)Jul 28, 2018: 60 index (high)Aug 7, 2018: 71 index (low)Aug 12, 2018: 65 index (low)Aug 17, 2018: 63 index (low)Aug 22, 2018: 47 index (low)Aug 27, 2018: 40 index (low)Sep 1, 2018: 49 index (low)Sep 16, 2018: 29 index (low)Sep 26, 2018: 28 index (low)Oct 16, 2018: 36 index (low)Oct 21, 2018: 41 index (low)Oct 31, 2018: 35 index (low)Nov 10, 2018: 57 index (high)Nov 15, 2018: 78 index (high)Nov 25, 2018: 67 index (high)Nov 30, 2018: 74 index (high)Dec 5, 2018: 79 index (high)Dec 10, 2018: 74 index (high)Dec 25, 2018: 66 index (high)Dec 30, 2018: 71 index (high)Jan 4, 2019: 71 index (high)Jan 14, 2019: 51 index (high)Jan 29, 2019: 59 index (high)Feb 8, 2019: 43 index (low)Mar 10, 2019: 80 index (high)Mar 15, 2019: 83 index (high)Mar 20, 2019: 96 index (low)Mar 25, 2019: 85 index (high)Mar 30, 2019: 121 index (low)Apr 4, 2019: 87 index (low)Apr 24, 2019: 106 index (high)Apr 29, 2019: 159 index (low)May 9, 2019: 155 index (low)May 19, 2019: 100 index (high)May 24, 2019: 147 index (low)May 29, 2019: 167 index (low)Jun 3, 2019: 150 index (low)Jun 18, 2019: 150 index (low)Jun 23, 2019: 124 index (high)Jun 28, 2019: 150 index (low)Jul 3, 2019: 126 index (high)Jul 28, 2019: 100 index (high)Aug 2, 2019: 114 index (low)Aug 22, 2019: 37 index (low)Aug 27, 2019: 35 index (low)Sep 1, 2019: 38 index (low)Sep 6, 2019: 37 index (low)Sep 11, 2019: 44 index (low)Sep 16, 2019: 55 index (low)Sep 21, 2019: 62 index (low)Sep 26, 2019: 34 index (low)Oct 1, 2019: 51 index (low)Oct 11, 2019: 48 index (low)Oct 16, 2019: 53 index (high)Oct 21, 2019: 46 index (low)Oct 26, 2019: 55 index (low)Nov 10, 2019: 72 index (high)Nov 20, 2019: 41 index (low)Nov 30, 2019: 46 index (low)Dec 10, 2019: 48 index (low)Dec 15, 2019: 59 index (high)Dec 20, 2019: 64 index (high)Dec 25, 2019: 71 index (high)Jan 9, 2020: 49 index (low)Jan 14, 2020: 55 index (low)Jan 24, 2020: 58 index (high)Jan 29, 2020: 50 index (low)Feb 3, 2020: 48 index (low)Feb 8, 2020: 68 index (high)Feb 13, 2020: 59 index (low)Feb 18, 2020: 54 index (high)Feb 23, 2020: 80 index (high)Feb 28, 2020: 73 index (high)Mar 4, 2020: 96 index (high)Mar 14, 2020: 73 index (high)Mar 19, 2020: 94 index (high)Mar 24, 2020: 101 index (high)Mar 29, 2020: 111 index (high)Apr 3, 2020: 111 index (high)Apr 8, 2020: 111 index (low)Apr 13, 2020: 126 index (low)May 3, 2020: 90 index (high)May 8, 2020: 141 index (low)May 13, 2020: 147 index (low)Jun 17, 2020: 154 index (low)Jun 22, 2020: 86 index (high)Jul 2, 2020: 131 index (low)Jul 7, 2020: 124 index (low)Jul 12, 2020: 132 index (low)Jul 17, 2020: 108 index (low)Jul 27, 2020: 66 index (high)Aug 1, 2020: 86 index (low)Aug 26, 2020: 82 index (low)Sep 5, 2020: 44 index (low)Sep 10, 2020: 54 index (high)Sep 25, 2020: 37 index (low)Oct 15, 2020: 30 index (low)Oct 25, 2020: 40 index (low)Oct 30, 2020: 35 index (low)Nov 4, 2020: 37 index (low)Nov 14, 2020: 42 index (low)Nov 24, 2020: 40 index (low)Dec 9, 2020: 34 index (low)Dec 19, 2020: 45 index (low)Dec 29, 2020: 36 index (low)Jan 23, 2021: 31 index (low)Jan 28, 2021: 48 index (low)Feb 2, 2021: 55 index (high)Feb 22, 2021: 57 index (high)Feb 27, 2021: 53 index (high)Mar 9, 2021: 57 index (low)Mar 14, 2021: 63 index (high)Mar 19, 2021: 79 index (low)Mar 24, 2021: 73 index (high)Apr 3, 2021: 83 index (low)Apr 8, 2021: 84 index (high)Apr 13, 2021: 89 index (low)Apr 18, 2021: 112 index (low)Apr 28, 2021: 106 index (low)May 3, 2021: 115 index (low)May 8, 2021: 112 index (low)May 23, 2021: 108 index (low)May 28, 2021: 135 index (low)Jun 2, 2021: 146 index (low)Jun 27, 2021: 146 index (low)Jul 2, 2021: 149 index (low)Jul 17, 2021: 94 index (high)Jul 22, 2021: 104 index (high)Jul 27, 2021: 112 index (high)Aug 1, 2021: 116 index (low)Aug 6, 2021: 116 index (low)Aug 11, 2021: 64 index (high)Aug 21, 2021: 69 index (high)Sep 10, 2021: 56 index (high)Sep 15, 2021: 52 index (low)Sep 20, 2021: 57 index (high)Sep 30, 2021: 36 index (low)Oct 10, 2021: 40 index (low)Oct 15, 2021: 47 index (low)Oct 20, 2021: 47 index (low)Oct 30, 2021: 55 index (high)Nov 14, 2021: 53 index (high)Nov 19, 2021: 54 index (high)Nov 24, 2021: 62 index (high)Nov 29, 2021: 44 index (low)Dec 4, 2021: 38 index (low)Dec 14, 2021: 59 index (low)Dec 24, 2021: 52 index (high)Dec 29, 2021: 40 index (low)Jan 3, 2022: 57 index (high)Jan 8, 2022: 54 index (high)Jan 13, 2022: 54 index (high)Jan 18, 2022: 59 index (high)Feb 2, 2022: 53 index (high)Feb 12, 2022: 47 index (low)Feb 22, 2022: 58 index (low)Feb 27, 2022: 52 index (high)Mar 4, 2022: 50 index (high)Mar 19, 2022: 81 index (high)Mar 29, 2022: 64 index (high)Apr 8, 2022: 83 index (low)May 8, 2022: 121 index (low)May 13, 2022: 123 index (low)May 18, 2022: 113 index (high)Jun 7, 2022: 116 index (high)Jun 12, 2022: 182 index (low)Jul 7, 2022: 170 index (low)Jul 12, 2022: 165 index (low)Jul 22, 2022: 173 index (low)Jul 27, 2022: 135 index (low)Aug 1, 2022: 146 index (low)Aug 16, 2022: 111 index (low)Aug 21, 2022: 97 index (high)Sep 10, 2022: 85 index (low)Sep 15, 2022: 60 index (high)Sep 20, 2022: 48 index (low)Sep 25, 2022: 53 index (low)Sep 30, 2022: 59 index (high)Oct 5, 2022: 23 index (low)Oct 25, 2022: 8.9 index (low)Oct 30, 2022: 9.8 index (low)Nov 4, 2022: 12 index (low)Nov 19, 2022: 18 index (low)Nov 29, 2022: 8.5 index (low)Dec 4, 2022: 14 index (low)Dec 9, 2022: 9.5 index (low)Dec 14, 2022: 18 index (low)Dec 19, 2022: 9.4 index (low)Dec 29, 2022: 16 index (low)Jan 23, 2023: 14 index (low)Feb 7, 2023: 14 index (low)Feb 17, 2023: 25 index (low)Feb 22, 2023: 21 index (low)Feb 27, 2023: 23 index (low)Mar 4, 2023: 37 index (low)Mar 9, 2023: 31 index (low)Mar 14, 2023: 38 index (low)Mar 24, 2023: 81 index (high)Apr 8, 2023: 94 index (high)Apr 13, 2023: 99 index (low)Apr 18, 2023: 84 index (low)Apr 23, 2023: 88 index (low)May 3, 2023: 114 index (low)May 8, 2023: 92 index (high)May 13, 2023: 114 index (high)May 18, 2023: 173 index (low)May 23, 2023: 134 index (high)May 28, 2023: 110 index (high)Jun 2, 2023: 118 index (low)Jun 7, 2023: 183 index (low)Jun 27, 2023: 189 index (low)Jul 2, 2023: 139 index (low)Jul 12, 2023: 151 index (high)Jul 22, 2023: 151 index (low)Aug 1, 2023: 134 index (high)Aug 6, 2023: 112 index (high)Aug 11, 2023: 103 index (high)Aug 21, 2023: 154 index (low)Aug 26, 2023: 107 index (high)Sep 5, 2023: 82 index (high)Sep 10, 2023: 74 index (high)Sep 15, 2023: 73 index (high)Sep 20, 2023: 79 index (high)Sep 25, 2023: 72 index (high)Oct 5, 2023: 92 index (high)Oct 15, 2023: 55 index (high)Oct 20, 2023: 35 index (low)Oct 25, 2023: 43 index (low)Nov 4, 2023: 86 index (high)Nov 9, 2023: 46 index (low)Nov 19, 2023: 58 index (high)Nov 29, 2023: 43 index (low)Dec 9, 2023: 33 index (low)Dec 19, 2023: 49 index (low)Dec 29, 2023: 39 index (low)Feb 2, 2024: 21 index (low)Feb 7, 2024: 48 index (low)Feb 12, 2024: 41 index (low)Feb 22, 2024: 23 index (low)Feb 27, 2024: 27 index (low)Mar 3, 2024: 36 index (low)Mar 13, 2024: 39 index (low)Mar 23, 2024: 63 index (low)Apr 7, 2024: 64 index (high)Apr 12, 2024: 87 index (low)Apr 17, 2024: 83 index (low)May 2, 2024: 91 index (high)May 7, 2024: 116 index (low)May 22, 2024: 156 index (low)May 27, 2024: 147 index (low)Jun 6, 2024: 120 index (low)Jun 16, 2024: 143 index (high)Jun 21, 2024: 180 index (low)Jun 26, 2024: 157 index (low)Jul 6, 2024: 139 index (high)Jul 16, 2024: 197 index (low)Jul 21, 2024: 150 index (low)Jul 26, 2024: 160 index (low)Aug 15, 2024: 129 index (high)Aug 20, 2024: 158 index (high)Aug 25, 2024: 122 index (high)Sep 4, 2024: 159 index (high)Sep 24, 2024: 49 index (low)Sep 29, 2024: 59 index (high)Oct 4, 2024: 39 index (low)Oct 14, 2024: 37 index (low)Oct 24, 2024: 34 index (low)Oct 29, 2024: 26 index (low)Nov 8, 2024: 20 index (low)Nov 13, 2024: 35 index (low)Nov 18, 2024: 17 index (low)Nov 23, 2024: 36 index (low)Nov 28, 2024: 11 index (low)Dec 3, 2024: 23 index (low)Dec 8, 2024: 23 index (low)Dec 23, 2024: 17 index (low)Jan 12, 2025: 25 index (low)Jan 27, 2025: 21 index (low)Feb 6, 2025: 19 index (low)Feb 21, 2025: 40 index (low)Feb 26, 2025: 31 index (low)Mar 3, 2025: 38 index (low)Mar 8, 2025: 42 index (low)Mar 13, 2025: 50 index (low)Mar 18, 2025: 48 index (low)Mar 28, 2025: 68 index (low)Apr 2, 2025: 82 index (low)Apr 12, 2025: 86 index (low)Apr 17, 2025: 73 index (low)Apr 27, 2025: 99 index (high)May 2, 2025: 119 index (high)May 7, 2025: 115 index (low)May 9, 2025: 133 index (low)May 17, 2025: 83 index (low)May 29, 2025: 173 index (low)Jun 1, 2025: 128 index (high)Jun 6, 2025: 129 index (low)Jun 16, 2025: 173 index (low)Jun 18, 2025: 202 index (low)Jun 26, 2025: 112 index (low)Jul 1, 2025: 183 index (low)Jul 16, 2025: 134 index (low)Jul 21, 2025: 111 index (high)Jul 26, 2025: 92 index (low)Jul 28, 2025: 105 index (low)Aug 5, 2025: 82 index (high)Aug 15, 2025: 52 index (high)Aug 20, 2025: 91 index (low)Aug 30, 2025: 47 index (low)Sep 6, 2025: 47 index (low)Sep 14, 2025: 28 index (low)Sep 19, 2025: 33 index (low)Sep 24, 2025: 23 index (low)Sep 26, 2025: 25 index (low)Sep 29, 2025: 41 index (low)Oct 9, 2025: 37 index (low)Oct 14, 2025: 21 index (low)Oct 16, 2025: 26 index (low)Oct 19, 2025: 34 index (low)Oct 24, 2025: 24 index (low)Oct 29, 2025: 26 index (low)Nov 3, 2025: 22 index (low)Nov 5, 2025: 27 index (low)Nov 8, 2025: 20 index (low)Nov 13, 2025: 23 index (low)Nov 18, 2025: 20 index (low)Nov 23, 2025: 17 index (low)Nov 25, 2025: 22 index (low)Nov 28, 2025: 33 index (low)Dec 28, 2025: 26 index (low)Jan 4, 2026: 34 index (low)Jan 7, 2026: 46 index (low)Jan 17, 2026: 41 index (low)Jan 22, 2026: 39 index (low)Jan 27, 2026: 56 index (high)Feb 1, 2026: 61 index (high)Feb 6, 2026: 63 index (high)Feb 21, 2026: 34 index (low)Mar 8, 2026: 58 index (high)Mar 28, 2026: 68 index (high)Apr 2, 2026: 84 index (low)Apr 4, 2026: 93 index (low)Apr 12, 2026: 89 index (low)Apr 17, 2026: 88 index (high)Apr 24, 2026: 110 index (high)Apr 27, 2026: 154 index (low)May 7, 2026: 142 index (low)May 17, 2026: 168 index (low)May 22, 2026: 160 index (low)Jun 6, 2026: 129 index (high)Jun 16, 2026: 199 index (low)Jun 21, 2026: 129 index (low)Jun 23, 2026: 164 index (low)Jun 26, 2026: 142 index (high)Jul 1, 2026: 159 index (low)Jul 6, 2026: 149 index (high)Jul 11, 2026: 156 index (low)Jul 21, 2026: 158 index (low)Jul 26, 2026: 161 index (low)Aug 15, 2026: 129 index (high)Aug 22, 2026: 136 index (high)Aug 30, 2026: 133 index (high)Sep 4, 2026: 154 index (high)Sep 9, 2026: 109 index (high)Sep 11, 2026: 126 index (high)Sep 14, 2026: 119 index (high)Sep 19, 2026: 89 index (high)Sep 24, 2026: 86 index (low)
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
Jan234939%
Feb334833%
Mar376857%
Apr369425%
May3812829%
Jun3214431%
Jul3713538%
Aug369450%
Sep445239%
Oct343612%
Nov403725%
Dec323725%

By year (median / highest): 2016: 52 / 138 (12 scenes) · 2017: 30 / 145 (18 scenes) · 2018: 71 / 150 (44 scenes) · 2019: 71 / 167 (43 scenes) · 2020: 71 / 154 (42 scenes) · 2021: 62 / 149 (44 scenes) · 2022: 58 / 182 (40 scenes) · 2023: 83 / 189 (46 scenes) · 2024: 59 / 197 (41 scenes) · 2025: 44 / 202 (54 scenes) · 2026: 122 / 199 (38 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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