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 Tama
Water temperature in the Tama by city today 📍
| City | Now | Swimming |
|---|---|---|
| Hachioji | +20° | Comfortable for swimming |
🎣 Fishing in cities on the Tama
Water temperature forecast in the Tama 📅
Computed by a climate model. Water changes slowly — no sharp shifts.
Water temperature in the Tama this weekend
Water temperature in the Tama for a month
There is no exact monthly water forecast — it changes slowly. The reference is the climate normal: up to +21° in summer. The monthly normal is below.
Monthly water temperature in the Tama 🗓️
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| +10 | +12 | +12 | +14 | +18 | +20 | +19 | +21 | +21 | +17 | +14 | +13 |
Climate normal (model estimate).
Swimming conditions in the Tama by month
When to swim in the Tama 🏖️
Cities on the Tama 📍
FAQ about water in the Tama ❓
What is the water temperature in the Tama now?
Now +20° — Comfortable for swimming.
Can you swim in the Tama?
Comfortable season — from May to October.
When is water warmest in the Tama?
Warmest in September — up to +21°.
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 Tama on this day
| City | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
|---|---|---|---|---|---|---|---|---|---|---|
| Hachioji | +21° | +21° | +21° | +20° | +20° | +20° | +21° | +21° | +21° | +20° |
Climate normal (model estimate for this date), not a measurement archive.
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Water temperature in the Tama — in detail
Water temperature in the Tama is tracked across 1 cities. The water is now about +20°. The page has a temperature map by city, a daily forecast and a monthly climate normal.