Beach forecast for Sasebo
Today, Thursday, October 29, 2026 · local time (GMT+9) · Nagasaki, Japan Today, Thu, Oct 29 · GMT+9- Swimming
- Calm · 0.4 ft
- Water
- 75 °F · nice
- Max UV
- 2 · SPF 15
- Low tide
- 3:49 am and 4:23 pm
Today, Thursday, October 29, it's a poor beach day in Sasebo (4/10). The best hours are from 2:00 pm to 5:00 pm: little wind, a calm sea, water at 75 °F and low tide at 4:23 pm, though with clouds and cool air. The best day this week is Friday, October 30, at 7/10.
Beach forecast for the next 7 days
| Day | Rating | Best hours | Swimming | Water | UV |
|---|---|---|---|---|---|
| Today | 4Poor beach day | 2:00–5:00 pm | Calm · 0.4 ft | 75 °F | 2 |
| Fri 30 | 7Good beach day | 12:00–5:00 pm | Calm · 1.9 ft | 75 °F | 4 |
| Sat 31 | 6Fair beach day | 10:00 am–3:00 pm | Calm · 1.9 ft | 74 °F | 5 |
| Sun 1 | 6Fair beach day | 3:00–5:00 pm | Calm · 0.5 ft | 74 °F | 3 |
| Mon 2 | 5Fair beach day | 2:00–5:00 pm | Use care · 2.9 ft | 74 °F | 5 |
| Tue 3 | 3Poor beach day | No good window | Calm · 1.6 ft | 73 °F | — |
| Wed 4 | 2Not a beach day | No good window | Calm · 0.7 ft | 73 °F | — |
Each rating comes from sun, temperature, rain, wind, waves, UV, water temperature and, where there is one, the tide.
Today in detail
- Onshore breeze (6 mph)
- Calm for swimming: 0.4 ft waves
- Water at 75 °F (nice)
- Low tide at 4:23 pm: more sand
- Cloudy (100% cloud cover)
- Feels like 68 °F: a bit cool
Today, hour by hour
- Swimming Calm · 0.4 ft
0.4 ft waves: calm for swimming. Low rip current risk. Always follow the lifeguard's flags.
- Water 75 °F
Nice for swimming.
- Sun & sunscreen UV 2 · SPF 15
Max UV 2 (low): SPF 15 sunscreen.
- Wind 7 mph
Onshore breeze (7 mph).
- Tide & sand 4:23 pm
Low tide at 3:49 am and 4:23 pm: that's when there's the most sand. High tide at 10:33 am and 9:52 pm. Coefficient 92 (spring tides): little sand left at high tide.
The best window, 2:00 pm to 5:00 pm, brings little wind, a calm sea, water at 75 °F and low tide at 4:23 pm, though with clouds and cool air.
We don't have data on jellyfish, sargassum or beach closures: ask the lifeguard or check with the local beach authority.
Today, hour by hour
| Time | Rating | Sky | Feels like | Wind | Waves | UV |
|---|---|---|---|---|---|---|
| 8:00 am | 0 | Overcast | 57 °F | 2 mph | 0.4 ft | 1 |
| 9:00 am | 0 | Partly cloudy | 63 °F | 1 mph | 0.4 ft | 2 |
| 10:00 am | 2 | Light drizzle | 66 °F | 2 mph | 0.4 ft | 2 |
| 11:00 am | 2 | Light drizzle | 67 °F | 5 mph | 0.3 ft | 2 |
| 12:00 pm | 3 | Light drizzle | 67 °F | 7 mph | 0.3 ft | 2 |
| 1:00 pm | 4 | Overcast | 68 °F | 7 mph | 0.3 ft | 1 |
| 2:00 pm | 4 | Overcast | 68 °F | 6 mph | 0.4 ft | 1 |
| 3:00 pm | 4 | Overcast | 68 °F | 4 mph | 0.4 ft | 1 |
| 4:00 pm | 4 | Overcast | 68 °F | 3 mph | 0.4 ft | 0 |
Beach hours only: from one hour after sunrise to half an hour before sunset.
Beaches near Sasebo
Map: OpenFreeMap · © OpenMapTiles · © OpenStreetMap contributors
Named beaches within 6.2 mi, nearest first. Amenities from OpenStreetMap: some may be missing or out of date. View on OpenStreetMap · Add or fix on OpenStreetMap
Beaches and amenities: © OpenStreetMap contributors (ODbL).
Webcams near Sasebo
Webcams provided by windy.com — add a webcam
How we rate a beach day
We rate every beach hour from 0 to 10 with simple, fixed rules:
- Adds: sunshine (up to 3 points, fewer with more clouds), warmth (up to 4, from the feels-like temperature; ideal between 81 °F and 91 °F), a calm sea (1), water at 70 °F or warmer (1; from 64 °F, half) and low or mid tide (1: more sand). Anything without data is left out and the rest is scaled to 10.
- Takes away: cold (feels-like below 64 °F, 1 to 4 points), rain (half a point if likely, up to 6 if it rains; thunderstorms, 8), wind from force 4, about 12 mph (1 to 6 points; half a point more if offshore, which blows inflatables out to sea, or onshore, which churns the water), waves (1 to swim with care, 4 if dangerous, 1 more for high rip current risk), very high UV (half a point; extreme, 1), water below 59 °F (1) and spring high tides (1: little sand left).
- Swimming: calm, use care (waves from 2.6 ft, or long swell) or dangerous (from 6.6 ft, or 4.9 ft with a long period), based on how much of the wave reaches this shore given the way it faces. In the U.S., today's and tomorrow's rip current risk comes from the National Weather Service surf zone forecast when it issues one; otherwise we estimate it from the waves.
- Best windows: runs of 2 to 5 hours rated 4 or more and close to the best hour, at least one hour apart.
- Day rating: the average of the best window; a 2-hour window keeps 85% of it and a 3-hour window 95%.
Today, in the best window: sun 0 of 3, warmth 1 of 4, calm sea 1 of 1, water 1 of 1 and tide 1 of 1; short window: the rating keeps 95%.
It's a guide, not a guarantee: weather changes and every beach is different. Always follow the lifeguard's flags.
Questions about the beach in Sasebo
Is it a beach day in Sasebo today?
A poor beach day: 4/10. Best from 2:00 pm to 5:00 pm, with little wind, a calm sea, water at 75 °F and low tide at 4:23 pm, though with clouds and cool air.
What are the swimming conditions in Sasebo today?
0.4 ft waves: calm for swimming. Low rip current risk. Always follow the lifeguard's flags.
How warm is the water in Sasebo?
About 75 °F today: nice. That's the sea surface temperature offshore; it can differ a little at the shoreline.
How much sun protection do I need in Sasebo today?
UV reaches 2 (low): SPF 15 sunscreen, sunglasses and a hat.
When is low tide in Sasebo?
Today low tide is at 3:49 am and 4:23 pm: that's when there's the most sand. High tide is at 10:33 am and 9:52 pm. Coefficient 92 (spring tides): little sand left at high tide.
What about tomorrow? Will it be a beach day in Sasebo?
Tomorrow, Friday, October 30: a good beach day (7/10), best from 12:00 pm to 5:00 pm.
What beaches are near Sasebo?
鹿子前海水浴場 (2.7 mi) and 浅子海水浴場 (5.9 mi). See below for amenities and water quality.
Are there jellyfish or sargassum today?
We don't know: there's no open data on jellyfish, sargassum or closures for each beach. Ask the lifeguard, check the flags or the local beach authority's website.
How is the rating worked out?
From the hourly forecast: sun and clouds, feels-like temperature, rain, wind (and whether it blows onshore or offshore), waves and their period, UV, water temperature and, where there is one, the tide. Each factor adds or takes away a fixed number of points and the rating sums them up out of 10.
More about Sasebo today
Learn more
Our own calculation, using the Open-Meteo forecast (ECMWF, NOAA GFS, Météo-France, Copernicus Marine and CAMS, CC BY 4.0), the tide from Sasebo (Japan Coast Guard) and the sun from astronomy-engine. Slackwater database (https://github.com/openwatersio/slackwater-database). Source: Japan Coast Guard, Hydrographic and Oceanographic Department, https://www1.kaiho.mlit.go.jp/TIDE/gauge/index_eng.php. Edited by Open Waters: constituent names, units and phases converted; tidal datums derived. Licensed Government Standard Terms of Use 2.0 (https://www1.kaiho.mlit.go.jp/copyright.html). Modified: see https://github.com/openwatersio/slackwater-database#modifications-to-source-data