This is a climate-model estimate, not a measurement: we have no measured water temperature for rivers, lakes and reservoirs yet. Real measurements are available for seas only.
Water temperature in Duluth for a month
There is no exact monthly water forecast — the reference is the climate normal: in summer the water warms to about +32°. The monthly normal is below.
Monthly water temperature in Duluth 🗓️
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| +17 | +19 | +21 | +23 | +27 | +32 | +32 | +30 | +30 | +28 | +22 | +19 |
Climate normal (model estimate).
Water temperature archive in Duluth on this day
| Year | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
|---|---|---|---|---|---|---|---|---|---|---|
| Water | +31° | +30° | +30° | +30° | +31° | +31° | +32° | +31° | +30° | +30° |
Climate normal (model estimate for this date), not a measurement archive.
When to swim in Duluth 🏖️
Where else to swim nearby 🏝️
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FAQ about water in Duluth ❓
What is the water temperature in Duluth now?
Now +30° — Warm water.
When to swim in Duluth?
Comfortable season — from January to December.
When is the water in Duluth warmest?
Warmest in June — up to +32°.
Water temperature in Duluth — in detail
A summary page of water temperature across all bodies of water in Duluth. Now about +30°. For seas the temperature is measured SST; for rivers and lakes it is a climate estimate.