Lakes / Lake Josephine Lake Josephine algae history from satellite We read Lake Josephine from 364 cloud-free satellite scenes between Feb 14, 2016 – Sep 24, 2026. Here is what the surface water showed.
Clear scenes 364
Typical (median), index 33
Highest reading 142 · Jun 6, 2026
Latest scene 46 · Sep 24, 2026 Algae signal (red-edge index) over time 0 50 100 150 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 Feb 14, 2016: 21 index (low) Apr 14, 2016: 33 index (low) May 14, 2016: 91 index (low) Jun 23, 2016: 36 index (low) Jul 13, 2016: 37 index (low) Aug 22, 2016: 20 index (low) Sep 11, 2016: 15 index (low) Oct 1, 2016: 17 index (low) Oct 21, 2016: 18 index (low) Nov 10, 2016: 15 index (low) Nov 20, 2016: 19 index (low) Nov 30, 2016: 21 index (low) Dec 30, 2016: 19 index (low) Feb 8, 2017: 26 index (low) Feb 18, 2017: -80.2 index (low) Mar 10, 2017: 25 index (low) Mar 30, 2017: 42 index (low) May 9, 2017: 57 index (low) May 29, 2017: 57 index (low) Aug 17, 2017: 29 index (low) Sep 21, 2017: 16 index (low) Sep 26, 2017: 12 index (low) Oct 16, 2017: 13 index (low) Nov 20, 2017: 12 index (low) Nov 25, 2017: 12 index (low) Dec 10, 2017: 9.5 index (low) Dec 15, 2017: 14 index (low) Dec 20, 2017: 16 index (low) Dec 30, 2017: 12 index (low) Jan 4, 2018: 15 index (low) Jan 9, 2018: 24 index (low) Jan 24, 2018: 17 index (low) Feb 8, 2018: 25 index (low) Feb 18, 2018: 21 index (low) Feb 23, 2018: 21 index (low) Feb 28, 2018: 24 index (low) Mar 5, 2018: 26 index (low) Mar 15, 2018: 23 index (low) Mar 25, 2018: 7 index (low) Mar 30, 2018: 44 index (low) Apr 4, 2018: 32 index (low) Apr 14, 2018: 63 index (low) Apr 19, 2018: 35 index (low) Apr 29, 2018: 49 index (low) May 4, 2018: 76 index (low) May 9, 2018: 65 index (low) May 24, 2018: 86 index (low) Jun 3, 2018: 115 index (low) Jun 8, 2018: 82 index (low) Jun 13, 2018: 42 index (low) Jun 23, 2018: 103 index (low) Jun 28, 2018: 85 index (low) Jul 3, 2018: 48 index (low) Jul 13, 2018: 31 index (low) Jul 28, 2018: 41 index (low) Aug 2, 2018: 78 index (low) Aug 7, 2018: 49 index (low) Aug 12, 2018: 36 index (low) Aug 17, 2018: 35 index (low) Aug 22, 2018: 30 index (low) Aug 27, 2018: 43 index (low) Sep 1, 2018: 37 index (low) Sep 11, 2018: 38 index (low) Sep 16, 2018: 24 index (low) Sep 21, 2018: 26 index (low) Sep 26, 2018: 22 index (low) Oct 1, 2018: 32 index (low) Oct 6, 2018: 21 index (low) Oct 16, 2018: 23 index (low) Oct 31, 2018: 22 index (low) Nov 5, 2018: 24 index (low) Nov 10, 2018: 16 index (low) Nov 20, 2018: 16 index (low) Dec 5, 2018: 19 index (low) Dec 25, 2018: 21 index (low) Dec 30, 2018: 21 index (low) Jan 4, 2019: 24 index (low) Jan 14, 2019: 17 index (low) Jan 19, 2019: 12 index (low) Jan 29, 2019: 23 index (low) Feb 3, 2019: 28 index (low) Feb 8, 2019: 11 index (low) Feb 23, 2019: 27 index (low) Mar 10, 2019: 38 index (low) Mar 25, 2019: 29 index (low) Apr 24, 2019: 39 index (low) Apr 29, 2019: 62 index (low) May 4, 2019: 78 index (low) May 9, 2019: 85 index (low) May 19, 2019: 82 index (low) May 24, 2019: 104 index (low) May 29, 2019: 96 index (low) Jun 3, 2019: 72 index (low) Jun 8, 2019: 98 index (low) Jun 23, 2019: 81 index (low) Jul 18, 2019: 82 index (low) Jul 23, 2019: 77 index (low) Jul 28, 2019: 34 index (low) Aug 22, 2019: 34 index (low) Aug 27, 2019: 28 index (low) Sep 1, 2019: 32 index (low) Sep 11, 2019: 16 index (low) Sep 16, 2019: 33 index (low) Sep 26, 2019: 16 index (low) Oct 11, 2019: 29 index (low) Oct 16, 2019: 17 index (low) Oct 21, 2019: 13 index (low) Oct 26, 2019: 28 index (low) Nov 10, 2019: 21 index (low) Nov 20, 2019: 18 index (low) Nov 25, 2019: 18 index (low) Nov 30, 2019: 17 index (low) Dec 10, 2019: 2.5 index (low) Dec 15, 2019: 16 index (low) Dec 25, 2019: 17 index (low) Jan 9, 2020: 13 index (low) Jan 29, 2020: -87 index (low) Feb 3, 2020: 20 index (low) Feb 13, 2020: 21 index (low) Feb 18, 2020: 21 index (low) Feb 23, 2020: 32 index (low) Feb 28, 2020: 24 index (low) Mar 4, 2020: 33 index (low) Mar 9, 2020: 49 index (low) Mar 14, 2020: 32 index (low) Mar 19, 2020: 38 index (low) Mar 24, 2020: 38 index (low) Mar 29, 2020: 43 index (low) Apr 3, 2020: 43 index (low) Apr 8, 2020: 51 index (low) Apr 28, 2020: 66 index (low) May 3, 2020: 58 index (low) May 8, 2020: 71 index (low) May 13, 2020: 83 index (low) Jun 17, 2020: 41 index (low) Jun 22, 2020: 43 index (low) Jun 27, 2020: 84 index (low) Jul 2, 2020: 110 index (low) Jul 17, 2020: 89 index (low) Jul 27, 2020: 38 index (low) Aug 1, 2020: 73 index (low) Aug 11, 2020: 34 index (low) Aug 26, 2020: 71 index (low) Aug 31, 2020: 25 index (low) Sep 5, 2020: 36 index (low) Sep 10, 2020: 40 index (low) Sep 25, 2020: 19 index (low) Oct 10, 2020: 35 index (low) Oct 15, 2020: 17 index (low) Oct 25, 2020: 23 index (low) Oct 30, 2020: 17 index (low) Nov 14, 2020: 15 index (low) Nov 19, 2020: 34 index (low) Nov 24, 2020: 25 index (low) Nov 29, 2020: 18 index (low) Dec 9, 2020: 19 index (low) Dec 19, 2020: 16 index (low) Dec 29, 2020: 25 index (low) Jan 23, 2021: 34 index (low) Jan 28, 2021: 24 index (low) Feb 2, 2021: 24 index (low) Feb 22, 2021: 42 index (low) Mar 9, 2021: 38 index (low) Mar 14, 2021: 43 index (low) Mar 19, 2021: 55 index (low) Mar 24, 2021: 41 index (low) Apr 8, 2021: 58 index (low) Apr 13, 2021: 59 index (high) Apr 18, 2021: 63 index (low) Apr 23, 2021: 70 index (low) Apr 28, 2021: 83 index (low) May 3, 2021: -291.5 index (low) May 8, 2021: 74 index (low) May 18, 2021: 107 index (low) May 23, 2021: 82 index (low) May 28, 2021: 59 index (low) Jun 27, 2021: 69 index (low) Jul 12, 2021: 131 index (low) Jul 17, 2021: 89 index (low) Aug 1, 2021: 98 index (low) Aug 6, 2021: 108 index (low) Aug 11, 2021: 105 index (low) Aug 21, 2021: 61 index (high) Sep 10, 2021: 46 index (low) Sep 20, 2021: 32 index (low) Sep 30, 2021: 22 index (low) Oct 10, 2021: 30 index (low) Oct 15, 2021: 33 index (low) Oct 20, 2021: 30 index (low) Oct 30, 2021: 29 index (low) Nov 9, 2021: 18 index (low) Nov 24, 2021: 24 index (low) Nov 29, 2021: 24 index (low) Dec 4, 2021: 13 index (low) Dec 9, 2021: 24 index (low) Dec 14, 2021: 22 index (low) Dec 24, 2021: 25 index (low) Dec 29, 2021: 22 index (low) Jan 3, 2022: 15 index (low) Jan 8, 2022: 22 index (low) Jan 13, 2022: 12 index (low) Jan 18, 2022: 20 index (low) Feb 2, 2022: 25 index (low) Feb 12, 2022: 24 index (low) Mar 19, 2022: 42 index (low) Mar 29, 2022: 31 index (low) Apr 8, 2022: -56.7 index (low) Apr 13, 2022: 77 index (low) Apr 18, 2022: 45 index (low) May 3, 2022: 87 index (low) May 8, 2022: 99 index (low) May 13, 2022: 76 index (high) May 18, 2022: 123 index (high) Jun 7, 2022: 81 index (low) Jun 12, 2022: 135 index (low) Jul 7, 2022: 100 index (low) Jul 12, 2022: 107 index (low) Aug 6, 2022: 116 index (low) Aug 31, 2022: 54 index (high) Sep 15, 2022: 55 index (high) Sep 20, 2022: 35 index (low) Sep 30, 2022: 47 index (low) Oct 5, 2022: 31 index (low) Oct 25, 2022: 21 index (low) Oct 30, 2022: 27 index (low) Nov 4, 2022: 23 index (low) Nov 19, 2022: -152.5 index (low) Nov 29, 2022: 19 index (low) Dec 9, 2022: 22 index (low) Dec 14, 2022: 23 index (low) Dec 19, 2022: 15 index (low) Dec 29, 2022: 19 index (low) Jan 8, 2023: 21 index (low) Feb 7, 2023: 20 index (low) Feb 17, 2023: 28 index (low) Feb 22, 2023: 25 index (low) Feb 27, 2023: 19 index (low) Mar 9, 2023: 34 index (low) Mar 14, 2023: 11 index (low) Mar 24, 2023: 36 index (low) Apr 8, 2023: 70 index (low) Apr 18, 2023: 47 index (low) May 3, 2023: 76 index (low) May 8, 2023: 93 index (low) May 13, 2023: 119 index (low) Jun 27, 2023: 116 index (low) Jul 2, 2023: 48 index (low) Jul 7, 2023: 138 index (low) Jul 12, 2023: 65 index (low) Aug 1, 2023: 90 index (low) Aug 6, 2023: 70 index (high) Aug 11, 2023: 55 index (high) Aug 21, 2023: 101 index (low) Aug 26, 2023: 45 index (low) Aug 31, 2023: 100 index (high) Sep 5, 2023: 44 index (low) Sep 10, 2023: 32 index (low) Sep 15, 2023: 50 index (low) Sep 20, 2023: 47 index (low) Sep 25, 2023: 49 index (low) Sep 30, 2023: 36 index (low) Oct 5, 2023: 38 index (low) Nov 4, 2023: 26 index (low) Nov 9, 2023: 24 index (low) Nov 19, 2023: 25 index (low) Nov 29, 2023: 15 index (low) Dec 9, 2023: 25 index (low) Dec 19, 2023: 23 index (low) Feb 2, 2024: 21 index (low) Feb 7, 2024: 31 index (low) Feb 12, 2024: 27 index (low) Feb 22, 2024: 28 index (low) Feb 27, 2024: 30 index (low) Apr 12, 2024: 52 index (low) May 2, 2024: 89 index (low) May 7, 2024: 67 index (low) May 12, 2024: 94 index (low) May 22, 2024: 134 index (low) May 27, 2024: 109 index (low) Jun 6, 2024: 74 index (high) Jul 6, 2024: 62 index (low) Jul 21, 2024: 116 index (low) Jul 26, 2024: 82 index (low) Jul 31, 2024: 102 index (low) Aug 25, 2024: 62 index (low) Aug 30, 2024: 66 index (low) Sep 4, 2024: 66 index (low) Sep 9, 2024: 43 index (low) Oct 4, 2024: 35 index (low) Oct 14, 2024: 33 index (low) Oct 24, 2024: 23 index (low) Nov 8, 2024: 18 index (low) Nov 13, 2024: 34 index (low) Nov 23, 2024: 15 index (low) Nov 28, 2024: 13 index (low) Dec 3, 2024: 16 index (low) Dec 13, 2024: 31 index (low) Dec 23, 2024: 21 index (low) Jan 2, 2025: 29 index (low) Jan 12, 2025: 17 index (low) Jan 27, 2025: 14 index (low) Feb 6, 2025: 24 index (low) Feb 21, 2025: 22 index (low) Feb 26, 2025: 30 index (low) Mar 3, 2025: 24 index (low) Mar 8, 2025: 18 index (low) Mar 13, 2025: 26 index (low) Mar 18, 2025: 21 index (low) Mar 28, 2025: 31 index (low) Apr 7, 2025: 40 index (low) Apr 12, 2025: 44 index (low) Apr 17, 2025: 35 index (low) Apr 27, 2025: 51 index (low) May 2, 2025: 53 index (high) May 29, 2025: 140 index (low) Jun 1, 2025: 64 index (high) Jun 6, 2025: 58 index (low) Jun 26, 2025: 88 index (low) Jul 1, 2025: 120 index (low) Jul 8, 2025: 58 index (low) Jul 26, 2025: 63 index (low) Jul 28, 2025: 38 index (low) Aug 17, 2025: 34 index (low) Sep 6, 2025: 47 index (low) Sep 24, 2025: 17 index (low) Sep 29, 2025: 42 index (low) Oct 14, 2025: 22 index (low) Oct 24, 2025: 22 index (low) Nov 3, 2025: 21 index (low) Nov 5, 2025: 27 index (low) Nov 8, 2025: 22 index (low) Nov 13, 2025: 20 index (low) Nov 18, 2025: 20 index (low) Nov 23, 2025: 16 index (low) Dec 3, 2025: 17 index (low) Dec 13, 2025: 25 index (low) Dec 23, 2025: 30 index (low) Dec 28, 2025: 23 index (low) Jan 2, 2026: 23 index (low) Jan 7, 2026: 29 index (low) Jan 12, 2026: 16 index (low) Jan 17, 2026: 30 index (low) Jan 27, 2026: 28 index (low) Feb 1, 2026: 26 index (low) Feb 6, 2026: 31 index (low) Feb 21, 2026: 31 index (low) Mar 8, 2026: 52 index (high) Mar 28, 2026: 38 index (low) Apr 12, 2026: 50 index (low) Apr 17, 2026: 42 index (low) Apr 24, 2026: 63 index (low) Apr 27, 2026: 86 index (low) Jun 6, 2026: 142 index (low) Jun 16, 2026: 131 index (low) Jun 21, 2026: 79 index (low) Jun 23, 2026: 53 index (low) Jun 26, 2026: 110 index (low) Jul 11, 2026: 42 index (low) Jul 21, 2026: 74 index (low) Aug 20, 2026: 46 index (low) Aug 30, 2026: 59 index (low) Sep 4, 2026: 70 index (low) Sep 14, 2026: 54 index (high) Sep 24, 2026: 46 index (low) Algae signal (red-edge index), index. One dot per cloud-free scene; dates are local to the lake. When it peaks Month Clear scenes Median, index Scenes rated high Jan 24 21 0% Feb 34 24 0% Mar 30 35 3% Apr 29 51 3% May 33 83 9% Jun 25 81 8% Jul 27 74 0% Aug 31 55 16% Sep 35 36 6% Oct 28 23 0% Nov 36 19 0% Dec 32 20 0%
By year (median / highest): 2016: 20 / 91 (13 scenes) · 2017: 15 / 57 (16 scenes) · 2018: 31 / 115 (47 scenes) · 2019: 28 / 104 (39 scenes) · 2020: 34 / 110 (43 scenes) · 2021: 41 / 131 (40 scenes) · 2022: 31 / 135 (34 scenes) · 2023: 44 / 138 (36 scenes) · 2024: 39 / 134 (30 scenes) · 2025: 28 / 140 (40 scenes) · 2026: 48 / 142 (26 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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