Beach forecast for Ko Olina
Today, Wednesday, October 28, 2026 · local time (HST) · Hawaii, United States Today, Wed, Oct 28 · HST- Swimming
- Dangerous · 5.0 ft
- Water
- 80 °F · warm
- Max UV
- 2 · SPF 15
- Low tide
- 1:04 pm and 10:53 pm
Today, Wednesday, October 28, it's not a beach day in Ko Olina (0/10). The best day this week is Tuesday, November 3, at 5/10.
Beach forecast for the next 7 days
| Day | Rating | Best hours | Swimming | Water | UV |
|---|---|---|---|---|---|
| Today | 0Not a beach day | Not today | Dangerous · 5.0 ft | 80 °F | 2 |
| Thu 29 | 4Poor beach day | 9:00 am–2:00 pm | Use care · 5.2 ft | 80 °F | 3 |
| Fri 30 | 4Poor beach day | 10:00 am–2:00 pm | Use care · 4.8 ft | 80 °F | 8 |
| Sat 31 | 4Poor beach day | 1:00–5:00 pm | Use care · 4.2 ft | 80 °F | 8 |
| Sun 1 | 3Poor beach day | No good window | Dangerous · 5.2 ft | 80 °F | 7 |
| Mon 2 | 4Poor beach day | No good window | Use care · 6.8 ft | 80 °F | — |
| Tue 3 | 5Fair beach day | 1:00–5:00 pm | Calm · 5.5 ft | 80 °F | — |
Each rating comes from sun, temperature, rain, wind, waves, UV, water temperature and, where there is one, the tide.
Today in detail
- Feels like 83 °F: beach weather
- Water at 80 °F (warm)
- Low tide at 1:04 pm: more sand
- Cloudy (99% cloud cover)
- Rain (0.54 in)
- Light offshore wind (11 mph): it blows floats and inflatables out to sea
Dangerous surf during beach hours. Stay out if the red flag is up, and never swim where there is no lifeguard.
Today, hour by hour
- Swimming Dangerous · 5.0 ft
5.0 ft waves every 11 s: dangerous for swimming. Stay out if the red flag is up. High rip current risk. If you're caught in a rip current, don't swim against it: swim parallel to shore and wave for help. Always follow the lifeguard's flags.
- Water 80 °F
Warm: very pleasant.
- Sun & sunscreen UV 2 · SPF 15
Max UV 2 (low): SPF 15 sunscreen.
- Wind 11 mph
Offshore breeze (11 mph). Watch floats and inflatables: offshore wind carries them out to sea.
- Tide & sand 10:53 pm
Low tide at 1:04 pm and 10:53 pm: that's when there's the most sand. High tide at 5:32 am and 5:15 pm.
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 | Light rain | 82 °F | 7 mph | 4.8 ft | 0 |
| 9:00 am | 0 | Rain | 82 °F | 7 mph | 4.8 ft | 0 |
| 10:00 am | 0 | Rain | 83 °F | 6 mph | 4.8 ft | 1 |
| 11:00 am | 0 | Rain | 83 °F | 7 mph | 4.8 ft | 1 |
| 12:00 pm | 0 | Heavy drizzle | 83 °F | 7 mph | 4.8 ft | 1 |
| 1:00 pm | 0 | Heavy drizzle | 82 °F | 9 mph | 4.9 ft | 1 |
| 2:00 pm | 1 | Heavy drizzle | 82 °F | 10 mph | 4.9 ft | 2 |
| 3:00 pm | 0 | Drizzle | 82 °F | 10 mph | 4.9 ft | 2 |
| 4:00 pm | 0 | Drizzle | 82 °F | 11 mph | 5.0 ft | 1 |
Beach hours only: from one hour after sunrise to half an hour before sunset.
Beaches near Ko Olina
Map: OpenFreeMap · © OpenMapTiles · © OpenStreetMap contributors
- Ko Olina 0.8 mi · S
- Showers
- Parking
- Kahe Point 1.1 mi · N
- Restrooms
- Showers
- Parking
- Hawaiian Electric Beach Park 1.2 mi · N
- Nanakuli Beach Park 2.7 mi · NW
- Showers
- Parking
Water quality: check the official beach advisories for Hawaii (Hawaii Department of Health).
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 Ko Olina
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 4 of 4, calm sea 0 of 1, water 1 of 1 and tide 1 of 1; minus rain 3, wind 0.5 and waves 2; 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 Ko Olina
Is it a beach day in Ko Olina today?
Not a beach day: 0/10. No good beach time today.
What are the swimming conditions in Ko Olina today?
5.0 ft waves every 11 s: dangerous for swimming. Stay out if the red flag is up. High rip current risk. If you're caught in a rip current, don't swim against it: swim parallel to shore and wave for help. Always follow the lifeguard's flags.
How warm is the water in Ko Olina?
About 80 °F today: warm. That's the sea surface temperature offshore; it can differ a little at the shoreline.
How much sun protection do I need in Ko Olina today?
UV reaches 2 (low): SPF 15 sunscreen, sunglasses and a hat.
When is low tide in Ko Olina?
Today low tide is at 1:04 pm and 10:53 pm: that's when there's the most sand. High tide is at 5:32 am and 5:15 pm.
What about tomorrow? Will it be a beach day in Ko Olina?
Tomorrow, Thursday, October 29: a poor beach day (4/10), best from 9:00 am to 2:00 pm.
What beaches are near Ko Olina?
Ko Olina (0.8 mi), Kahe Point (1.1 mi), Hawaiian Electric Beach Park (1.2 mi) and Nanakuli Beach Park (2.7 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 Ko Olina 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 Barbers Point (TICON-4) and the sun from astronomy-engine. Slackwater database (https://github.com/openwatersio/slackwater-database). Source: Hart-Davis, M., Dettmering, D., Seitz, F. (2025), TICON-4: TIdal CONstants based on GESLA-4 sea-level records, SEANOE, https://doi.org/10.17882/109129. Licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Modified: see https://github.com/openwatersio/slackwater-database#modifications-to-source-data