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 the Ar
Water temperature in the Ar by city today 📍
| City | Now | Swimming |
|---|---|---|
| Arbryuk | +16° | Cool for swimming |
| Altenar | +16° | Cool for swimming |
| Berg (Arvayler) | +16° | Cool for swimming |
| Blankenkhaym | +16° | Cool for swimming |
| Dernau | +16° | Cool for swimming |
| Ikskhaym | +16° | Cool for swimming |
| Bad Neuenahr-Ahrweiler | +16° | Cool for swimming |
| Bad-Khenningen | +17° | Cool for swimming |
| Bad-Brayzig | +17° | Cool for swimming |
| Remagen | +17° | Cool for swimming |
| Dattenberg | +17° | Cool for swimming |
| Kasbakh-Olenberg | +16° | Cool for swimming |
| Loybsdorf | +17° | Cool for swimming |
| Lints-na-Reyne | +17° | Cool for swimming |
| Okkenfels | +16° | Cool for swimming |
| Erpel | +16° | Cool for swimming |
| Unkel | +16° | Cool for swimming |
| Sinzig | +17° | Cool for swimming |
🎣 Fishing in cities on the Ar
Water temperature forecast in the Ar 📅
Computed by a climate model. Water changes slowly — no sharp shifts.
Water temperature in the Ar this weekend
Water temperature in the Ar for a month
There is no exact monthly water forecast — it changes slowly. The reference is the climate normal: up to +18° in summer. The monthly normal is below.
Monthly water temperature in the Ar 🗓️
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| +2 | +4 | +6 | +8 | +13 | +18 | +18 | +16 | +16 | +13 | +7 | +5 |
Climate normal (model estimate).
Swimming conditions in the Ar by month
When to swim in the Ar 🏖️
Cities on the Ar 📍
FAQ about water in the Ar ❓
What is the water temperature in the Ar now?
Now +16° — Cool for swimming.
Can you swim in the Ar?
Comfortable season — June and July.
When is water warmest in the Ar?
Warmest in June — up to +18°.
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 the Ar on this day
| City | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
|---|---|---|---|---|---|---|---|---|---|---|
| Arbryuk | +17° | +17° | +16° | +16° | +16° | +17° | +17° | +17° | +16° | +16° |
| Altenar | +17° | +16° | +16° | +16° | +16° | +17° | +17° | +16° | +16° | +16° |
| Berg (Arvayler) | +17° | +17° | +16° | +16° | +16° | +17° | +17° | +17° | +16° | +16° |
| Blankenkhaym | +18° | +17° | +16° | +16° | +17° | +17° | +18° | +17° | +17° | +16° |
| Dernau | +17° | +17° | +16° | +16° | +16° | +17° | +17° | +17° | +16° | +16° |
Climate normal (model estimate for this date), not a measurement archive.
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Water temperature in the Ar — in detail
Water temperature in the Ar is tracked across 18 cities. The water is now about +16°. The page has a temperature map by city, a daily forecast and a monthly climate normal.