Beach forecast for Koshigoe
Today, Thursday, October 29, 2026 · local time (GMT+9) · Kanagawa, Japan Today, Thu, Oct 29 · GMT+9- Swimming
- Calm · 1.4 ft
- Water
- 74 °F · nice
- Max UV
- 3 · SPF 15
- Low tide
- 12:14 am and 12:16 pm
Today, Thursday, October 29, it's not a beach day in Koshigoe (1/10). The best day this week is Saturday, October 31, at 5/10.
Beach forecast for the next 7 days
| Day | Rating | Best hours | Swimming | Water | UV |
|---|---|---|---|---|---|
| Today | 1Not a beach day | Not today | Calm · 1.4 ft | 74 °F | 3 |
| Fri 30 | 2Not a beach day | No good window | Use care · 3.9 ft | 76 °F | 4 |
| Sat 31 | 5Fair beach day | 11:00 am–4:00 pm | Use care · 3.4 ft | 76 °F | 4 |
| Sun 1 | 0Not a beach day | No good window | Use care · 4.2 ft | 75 °F | 4 |
| Mon 2 | 0Not a beach day | No good window | Use care · 4.0 ft | 74 °F | 5 |
| Tue 3 | 4Poor beach day | 10:00 am–3:00 pm | Use care · 3.1 ft | 74 °F | — |
| Wed 4 | 0Not a beach day | No good window | Use care · 2.9 ft | 74 °F | — |
Each rating comes from sun, temperature, rain, wind, waves, UV, water temperature and, where there is one, the tide.
Today in detail
- Offshore breeze (6 mph)
- Calm for swimming: 1.4 ft waves
- Water at 74 °F (nice)
- Low tide at 12:16 pm: more sand
- Cloudy (88% cloud cover)
- Feels like 58 °F: chilly for the beach
Today, hour by hour
- Swimming Calm · 1.4 ft
1.4 ft waves: calm for swimming. Low rip current risk. Always follow the lifeguard's flags.
- Water 74 °F
Nice for swimming.
- Sun & sunscreen UV 3 · SPF 15
Max UV 3 (low): SPF 15 sunscreen.
- Wind 6 mph
Offshore breeze (6 mph).
- Tide & sand 12:14 am
Low tide at 12:14 am and 12:16 pm: that's when there's the most sand. High tide at 7:17 am and 5:30 pm. Coefficient 91 (spring tides): little sand left at high tide.
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 |
|---|---|---|---|---|---|---|
| 7:00 am | 0 | Overcast | 44 °F | 4 mph | 1.4 ft | 0 |
| 8:00 am | 0 | Overcast | 47 °F | 5 mph | 1.3 ft | 1 |
| 9:00 am | 0 | Overcast | 50 °F | 5 mph | 1.3 ft | 1 |
| 10:00 am | 0 | Overcast | 51 °F | 5 mph | 1.3 ft | 2 |
| 11:00 am | 0 | Overcast | 52 °F | 5 mph | 1.3 ft | 3 |
| 12:00 pm | 0 | Overcast | 53 °F | 6 mph | 1.3 ft | 2 |
| 1:00 pm | 1 | Overcast | 54 °F | 5 mph | 1.3 ft | 2 |
| 2:00 pm | 2 | Partly cloudy | 56 °F | 4 mph | 1.4 ft | 2 |
| 3:00 pm | 1 | Partly cloudy | 58 °F | 4 mph | 1.4 ft | 1 |
Beach hours only: from one hour after sunrise to half an hour before sunset.
Beaches near Koshigoe
Map: OpenFreeMap · © OpenMapTiles · © OpenStreetMap contributors
- 富士見浜 1.0 mi · SW
- Restrooms
- Parking
- 辻堂海岸 2.1 mi · W
- Restrooms
- Parking
- Yuigahama Beach 2.5 mi · E
- Restrooms
- Parking
- Zaimokuza Playa 3.1 mi · E
- Restrooms
- Parking
- Zushi Beach 4.5 mi · E
- Restrooms
- Parking
- Isshiki Beach 5.5 mi · SE
- Restrooms
- Parking
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 Koshigoe
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 1 of 3, warmth 0 of 4, calm sea 1 of 1, water 1 of 1 and tide 1 of 1; minus cold 2.5; short window: the rating keeps 85%.
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 Koshigoe
Is it a beach day in Koshigoe today?
Not a beach day: 1/10. No good beach time today.
What are the swimming conditions in Koshigoe today?
1.4 ft waves: calm for swimming. Low rip current risk. Always follow the lifeguard's flags.
How warm is the water in Koshigoe?
About 74 °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 Koshigoe today?
UV reaches 3 (low): SPF 15 sunscreen, sunglasses and a hat.
When is low tide in Koshigoe?
Today low tide is at 12:14 am and 12:16 pm: that's when there's the most sand. High tide is at 7:17 am and 5:30 pm. Coefficient 91 (spring tides): little sand left at high tide.
What about tomorrow? Will it be a beach day in Koshigoe?
Tomorrow, Friday, October 30: not a beach day (2/10).
What beaches are near Koshigoe?
富士見浜 (1.0 mi), 辻堂海岸 (2.1 mi), Yuigahama Beach (2.5 mi), Zaimokuza Playa (3.1 mi) and Zushi Beach (4.5 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 Koshigoe 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 Shonan Port (JMA) and the sun from astronomy-engine. Source: Japan Meteorological Agency website (出典：気象庁ホームページ), tide table (潮位表) for Shonan Port (湘南港), https://www.data.jma.go.jp/kaiyou/db/tide/suisan/suisan.php?stn=D8. Public Data License (Version 1.0) (https://www.digital.go.jp/resources/open_data/public_data_license_v1.0), compatible with CC BY 4.0. Modified by TidePlanet (気象庁「潮位表」を加工して作成): harmonic constants fitted from the hourly prediction of 2025–2026; not an official JMA product.