Diving and snorkeling in Batang
Today, Thursday, October 29, 2026 · local time (GMT+7) · Central Java, Indonesia Today, Thu, Oct 29 · GMT+7- Current (model)
- 0.2 mph · NE
- Swell
- 0.2 ft, 2 s
- Water and suit
- 86.2 °F · Shorty or a rash guard
- Likely visibility
- Good
Today, Thursday, October 29, the best time to dive in Batang is 6:30 am to 9:30 am, with little swell, light wind and weak current. It's a great day (10/10). Visibility is likely good. Water at 86.2–87.8 °F: a shorty or a rash guard. Today is the best day this week.
Your diving day in Batang at a glance
The strip runs from midnight to midnight, local time. Daylight on top; then the tide with its slack water (purple bands), the conditions hour by hour and the best times.
Today in detail
Likely visibility: good- Slack water today: none; the tide doesn't count here
- Likely visibility: good. Rain (0.35 in) over the last few days has stirred up the water. Based on the last 24 hours of data.
- Water at 86.2–87.8 °F: a shorty or a rash guard.
- Snorkeling: good, calm sea and light wind.
- Night dive: dark from 5:52 pm. Waning gibbous (87%), rising at 8:46 pm: a bright night.
How deep it gets off the shore
Shallow near shore: you only reach 33 ft at 1.6 mi. For dives deeper than 33 ft, go by boat.
Source: NOAA ETOPO 2022 (CC0), cells of about 0.3 mi. For reference only: not for navigation or anchoring.
We don't have a reliable tide for Batang, so slack water doesn't count in the rating.
Never dive alone and check with the local dive shop: this rating is a guide, not a substitute for a professional.
Diving forecast for the next 7 days
| Day | Rating | Best times | Swell | Visibility | Water |
|---|---|---|---|---|---|
| Today | 10 great day | 6:30–9:30 am3:30–5:30 pm | 0.2 ft · 2 s | Good | 86.2 °F · Shorty or a rash guard |
| Fri 30 | 10 great day | 7:30–10:30 am3:20–5:30 pm | 0.1 ft · 3 s | Good | 86.4 °F · Shorty or a rash guard |
| Sat 31 | 9 great day | 8:20–11:20 am | 0.3 ft · 2 s | Fair | 86.7 °F · Shorty or a rash guard |
| Sun 1 | 9 great day | 8:20–11:20 am3:30–5:30 pm | 0.2 ft · 2 s | Fair | 86.9 °F · Shorty or a rash guard |
| Mon 2 | 9 great day | 8:20–11:20 am4:30–5:30 pm | 0.4 ft · 3 s | Fair | 86.9 °F · Shorty or a rash guard |
| Tue 3 | 9 great day | 8:20–11:20 am | 0.3 ft · 3 s | Fair | 87.1 °F · Shorty or a rash guard |
| Wed 4 | 10 great day | 8:20–11:20 am | 0.4 ft · 3 s | Good | 87.4 °F · Shorty or a rash guard |
Each day's rating comes from the swell, waves, wind, current, slack water, daylight and likely visibility. The forecast reaches about 7 days.
Dive sites, wrecks and dive shops nearby
Map: OpenFreeMap · © OpenMapTiles · © OpenStreetMap contributors
Within 12 mi. Some may be missing or closed; marine reserves usually need a permit. Open the map on OpenStreetMap · Missing one? Add it to OpenStreetMap
Wreck and reef positions are approximate and not for navigation; a wreck’s depth runs from the top of the hull to the seabed.
Sites: © OpenStreetMap contributors (ODbL). Wrecks: EMODnet Human Activities (AND-International), from UK Hydrographic Office data, CC BY 4.0. Contains public sector information licensed under the Open Government Licence v3.0.
Coral in the area
NOAA's Coral Reef Watch satellites track water heat on coral reefs every day. In the “Northern Java” area, which this place is in, on October 27: Bleaching watch: the water is already a little above normal for the warmest month; there's no worrying build-up of heat yet.
- Alert level
- Bleaching watch
- Heat build-up (12 weeks)
- 0.0 °C-weeks · steady
- Water vs. normal
- 1.3 °F warmer than normal
Heat build-up adds up, week by week over the last three months, how far the water goes above its normal summer maximum. According to Coral Reef Watch, significant bleaching is likely from 4 °C-weeks and severe bleaching with mortality from 8.
Satellite: NOAA Coral Reef Watch (reef areas, 3.1 mi pixels). It covers the whole area, not this exact spot. Sources and licenses
How we work out the diving rating
We score every moment of the day, every 10 minutes, from 0 to 10, with simple fixed rules:
- Swell: takes points away based on its height and period (a 10 s swell weighs 50% more than a 6 s one, because it reaches deeper and moves the bottom): nothing under 1.6 ft, up to 6.5 points from 9.8 ft. Surface waves count for getting in and out; we take the worse of the two.
- Wind: takes points away from force 4, about 12 mph (1 point), up to 6 points in a gale; half a point more when it blows offshore, because it pushes surface swimmers away from shore.
- Current: Météo-France's model current takes points away from half a knot (1 point) up to 6 points from 2 knots.
- Slack water: where we show the tide, up to 3 points come off when the water rises or falls fast (mid-tide, especially on spring tides) and none at slack, around each high and low tide.
- Light: half a point more with the sun high (3 hours either side of solar noon), 1.5 less at twilight and 3 less at night. Thunderstorms take away 5 and heavy rain 1.
- Likely visibility: good, fair or poor from the swell of the previous 48 hours, the rain of the previous 72 and the wind of the previous 24. Fair takes 1 point off the day's rating and poor, 2.
- Day's rating: the average of the best window (the stretch of 40 minutes to 3 hours with the best conditions), adjusted for likely visibility.
- Wetsuit, by water temperature: below 50 °F, drysuit; from 50 °F, 7 mm semi-dry; from 57 °F, 7 mm wetsuit; from 64 °F, 5 mm; from 72 °F, 3 mm; from 79 °F, shorty or rash guard.
Today: the best window scores 9.7 out of 10 and visibility is likely good, so it takes nothing off.
It's an estimate from the swell, rain and wind of the previous days, not a measurement: real visibility also depends on the bottom, plankton and nearby rivers.
It is a guide built from models, not a guarantee: every site has its own currents and bottom. Look at the water when you get there and ask the dive shop.
Before you get in the water
- Never dive alone: always with a buddy and, if you don't know the site, with a dive shop.
- Check with the local dive shop or club: they know the currents, the no-dive zones and how the water is today.
- Dive within your certification and experience, and stay within depth and no-decompression limits.
- Fly a dive flag (diver-down or alpha flag) on a float and watch for boat traffic.
- Marine reserves need a permit and often have quotas: ask before you go.
- This rating doesn't replace a professional's judgment or what you see when you arrive: if the sea doesn't look right, don't go in.
Questions about diving in Batang
Can you dive in Batang today?
Today is a great day (10/10). The best time is 6:30 am to 9:30 am, with little swell, light wind and weak current.
What about tomorrow? When's the best time to dive in Batang?
Tomorrow, Friday, October 30: 7:30 am to 10:30 am, with a rating of 10/10.
Which day this week is best for diving in Batang?
Wednesday, November 4, at 10/10. Its best time is 8:20 am to 11:20 am.
What will the visibility be like in Batang?
Likely good. Rain (0.35 in) over the last few days has stirred up the water. Based on the last 24 hours of data. It's an estimate, not a measurement.
What wetsuit do I need to dive in Batang?
Water at 86.2–87.8 °F: a shorty or a rash guard. If you get cold easily or plan several dives, go thicker.
Can you dive at night?
Yes, with experience, a primary and a backup light, and ideally with a dive shop. Night dive: dark from 5:52 pm. Waning gibbous (87%), rising at 8:46 pm: a bright night.
How is the rating worked out?
From the swell and its period, the waves, the wind, the current, slack water, daylight and likely visibility. Each factor adds or takes away a fixed number of points and the rating sums up the best window of the day out of 10.
More about Batang today
Learn more
Our own calculation: sun and moon with astronomy-engine, and sea and weather from Open-Meteo (Météo-France, ECMWF, NOAA GFS and Copernicus Marine, CC BY 4.0). Dive sites: © OpenStreetMap contributors (ODbL).