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 map of Lake Onega
Water temperature in Lake Onega by city today 📍
| City | Now | Swimming |
|---|---|---|
| Kondopoga | +16° | Cool for swimming |
| Petrozavodsk | +17° | Cool for swimming |
🎣 Fishing in cities on Lake Onega
Water temperature forecast in Lake Onega 📅
Computed by a climate model. Water changes slowly — no sharp shifts.
Water temperature in Lake Onega this weekend
Water temperature in Lake Onega for a month
There is no exact monthly water forecast — it changes slowly. The reference is the climate normal: up to +17° in summer. The monthly normal is below.
Monthly water temperature in Lake Onega 🗓️
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| ❄ | ❄ | +1 | +5 | +13 | +17 | +16 | +17 | +17 | +11 | +5 | +3 |
Climate normal (model estimate).
Swimming conditions in Lake Onega by month
When to swim in Lake Onega 🏖️
Cities on Lake Onega 📍
FAQ about water in Lake Onega ❓
What is the water temperature in Lake Onega now?
Now +17° — Cool for swimming.
When is water warmest in Lake Onega?
Warmest in August — up to +17°.
Where does the water temperature data come from?
A water temperature model (by latitude, longitude and day of year), by cities.
Water temperature archive in Lake Onega on this day
| City | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
|---|---|---|---|---|---|---|---|---|---|---|
| Kondopoga | +16° | +17° | +17° | +16° | +15° | +15° | +16° | +17° | +17° | +16° |
| Petrozavodsk | +17° | +18° | +18° | +17° | +16° | +16° | +17° | +18° | +18° | +17° |
Climate normal (model estimate for this date), not a measurement archive.
Website widget
Add the «Water temperature in Lake Onega» widget — free
Pick a body of water, size and colour — get ready-made code. Works on any site.
Get the widget →
Water temperature in Lake Onega — in detail
Water temperature in Lake Onega is tracked across 2 cities. The water is now about +17°. The page has a temperature map by city, a daily forecast and a monthly climate normal.