Seirō tides
Today, Thursday, October 29, 2026 · local time (GMT+9) · Niigata, Japan- 3:03 am1.3 ft
- 6:41 pm1.1 ft
- 11:04 am0.2 ft
- 9:35 pm1.1 ft
- Tide now
- 0.4 ft ↓ falling · low 11:04 am (0.2 ft)
- Coefficient
- 96 · spring tides
- Range today
- 1.1 ft
Today there are high tides at 3:03 am (1.3 ft) and 6:41 pm (1.1 ft) and low tides at 11:04 am and 9:35 pm. Tide coefficient 96. Right now the tide is falling toward the low tide at 11:04 am. In Seirō the tide is mixed: two high and two low tides a day, but of quite different heights. The next spring tides: from October 27 to 29.
Today's high and low tides
- ▲ High tide 3:03 am 1.3 ft · coef. 96
- ▼ Next low tide 11:04 am 0.2 ft
- ▲ High tide 6:41 pm 1.1 ft · coef. 91
- ▼ Low tide 9:35 pm 1.1 ft
↓ Falling The tide is falling. 2 h 24 min to low tide at 11:04 am.
Tide coefficient 96 for the 3:03 am high tide and 91 for the 6:41 pm high tide. Spring tides. The water rises and falls 1.1 ft between the highest high and the lowest low: a large range for this place. 70 is an average tide here; 90 and above means spring tides; below 45, neap tides. What is the tide coefficient?
Heights above NLLW. Astronomical prediction: wind and air pressure can raise or lower the water by a few inches, and more in a storm. Not for navigation.
Tides for the next 7 days
| Day | Sun | Tide 1 | Tide 2 | Tide 3 | Tide 4 | Coef. | Moon | Major periods | Activity |
|---|---|---|---|---|---|---|---|---|---|
| Today, Thu 29 | 6:05 am · 4:48 pm | High tide 3:03 am · 1.3 ft | Low tide 11:04 am · 0.2 ft | High tide 6:41 pm · 1.1 ft | Low tide 9:35 pm · 1.1 ft | Coef. 96 | 88% | Major periods 12:43 am · 1:16 pm | Medium |
| Fri 30 | 6:06 am · 4:47 pm | High tide 3:44 am · 1.4 ft | Low tide 12:04 pm · 0.3 ft | — | — | Coef. 88 | 80% | Major periods 1:48 am · 2:20 pm | High |
| Sat 31 | 6:07 am · 4:46 pm | High tide 4:30 am · 1.4 ft | Low tide 1:09 pm · 0.3 ft | — | — | Coef. 76 | 69% | Major periods 2:52 am · 3:23 pm | Medium |
| Sun 1 | 6:08 am · 4:45 pm | High tide 5:26 am · 1.3 ft | Low tide 2:18 pm · 0.3 ft | — | — | Coef. 64 | 58% | Major periods 3:52 am · 4:21 pm | Medium |
| Mon 2 | 6:09 am · 4:43 pm | High tide 6:42 am · 1.2 ft | Low tide 3:28 pm · 0.4 ft | — | — | Coef. 55 | Last quarter | Major periods 4:48 am · 5:14 pm | Medium |
| Tue 3 | 6:10 am · 4:42 pm | High tide 8:27 am · 1.1 ft | Low tide 4:36 pm · 0.4 ft | High tide 11:59 pm · 0.9 ft | — | Coef. 56 | 36% | Major periods 5:39 am · 6:04 pm | Medium |
| Wed 4 | 6:11 am · 4:41 pm | Low tide 4:42 am · 0.8 ft | High tide 10:09 am · 1.0 ft | Low tide 5:36 pm · 0.5 ft | — | Coef. 59 | 26% | Major periods 6:27 am · 6:50 pm | Medium |
▲ high tide · ▼ low tide · heights above NLLW. Major periods: start time; they last 2 hours. Activity: based on the moon phase and the solunar periods.
Tide coefficient and range in October
The biggest tides of the month came from October 27 to 28 (coefficient 99, 1.0 ft range). The smallest, on October 19 (coefficient 24, 0.6 ft).
Type of tide
In Seirō the tide is mixed: two high and two low tides a day, but of quite different heights. Types of tides
2026 extremes: the highest tide of the year is on August 11 (1.6 ft) and the lowest, on April 19 (-0.6 ft).
Reference levels
- Highest astronomical tide (HAT)1.6 ft
- Mean higher high water (MHHW)0.9 ft
- Mean high water (MHW)0.8 ft
- Mean sea level (MSL)0.6 ft
- Mean low water (MLW)0.4 ft
- Mean lower low water (MLLW)0.2 ft
- Lowest astronomical tide (LAT)-0.6 ft
Heights above NLLW.
Questions about the tides in Seirō
What time is high tide today in Seirō?
High tide today is at 3:03 am (1.3 ft) and 6:41 pm (1.1 ft). Low tide is at 11:04 am and 9:35 pm.
What time is high tide tomorrow in Seirō?
On Friday, October 30, high tide at 3:44 am and low tide at 12:04 pm.
What is today's tide coefficient?
96: spring tides. 70 is an average tide here; 90 and above means spring tides; below 45, neap tides.
When are the next spring tides?
From October 27 to 29, after the new or full moon, with the moon near perigee, so they will be bigger than usual.
How many tides a day are there in Seirō?
The tide is mixed: two high and two low tides a day, but of quite different heights. Each high tide comes about 50 minutes later than the day before.
What are the heights measured from?
From NLLW. That is why a low tide can be negative: that day the water drops below that zero.
Can I use these tides for navigation?
No. They are astronomical predictions for planning fishing and outings; for navigation use official publications and nautical charts.
More about Seirō today
Tides near Seirō
- Niigata ▲ 3:00 am
- Murakami ▲ 2:54 am
- Izumozaki ▲ 2:56 am
- Ryōtsu-minato ▲ 2:52 am
- Sakata ▲ 3:10 am
- Jōetsu ▲ 2:47 am
Each place with its own tide station; next to it, the time of its first high tide today.
Learn more
Tides from the Niigata-higashi station (TICON-4), 2.1 mi from Seirō. Times and heights are its predictions. Station data attribution: 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