Rio Vista Tides Today
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Rio Vista runs a mean tidal range of about 2.6 ft. This month the highest water, 4.6 ft, comes on the afternoon of Nov 25, and the lowest, a -0.5 ft minus tide, on the morning of Nov 27.
| Low tide | 5:56 AM | 0.2 ft |
| High tide | 12:09 PM | 3.7 ft |
| Low tide | 6:36 PM | 0.7 ft |
Today on the water at Rio Vista
Today at Rio Vista: high tide at 12:09 PM (3.7 ft), low tide at 5:56 AM (0.2 ft) and 6:36 PM (0.7 ft). The National Weather Service forecast for Wednesday is sunny with NW winds 5 to 14 mph, 69°F. Sunrise is at 6:35 AM and sunset at 5:05 PM.
| Period | Forecast | Wind | Temp |
|---|---|---|---|
| Overnight | Mostly Clear | NW 14 mph | 48°F |
| Wednesday | Sunny | NW 5 to 14 mph | 69°F |
Forecast: National Weather Service point forecast for this location.
Where Rio Vista is
Rio Vista sits at 38.1450° N, 121.6920° W on San Francisco Bay, at Rio Vista, CA. The station here is a historical NOAA reference station: a gauge measured the tide at this spot from 1978 until 1997, and NOAA still publishes harmonic predictions from that record. There is no live reading here today. The closest gauge measuring live water level is Port Chicago, Suisun Bay (NOAA 9415144), 19.9 mi away, and high and low water here run on average about 113 min later than there.
The tide at Rio Vista
Rio Vista has a mixed tide: two highs and two lows a day, but of unequal size, so one low each day drains noticeably lower than the other. This month's predictions average 1.9 high tides a day here. The mean range from lower low to higher high is 4.1 ft, and 3.0 ft between the average high and the average low, a moderate tide. On an average day the higher high tops the lower high by 0.5 ft and the lower low sits 0.6 ft below the other low. For the water around it: Bay tides are mixed semidiurnal, two unequal highs a day with a range near 6 ft at the Golden Gate that shifts in time as it moves into the bay and up the rivers.
About this station
- High tide reaches Rio Vista about 11.8 hours after the moon passes overhead. That lag is local, which is why high water does not line up with the moon.
Datum and source
Heights on this page are feet above mean lower low water (MLLW), the zero NOAA's nautical charts use for soundings. A predicted 0.0 ft low is the average of the lower low each day; a minus tide is water below chart datum, and a 2 ft high means 2 ft more water than the chart shows. NOAA fixes MLLW at Rio Vista from the 1983-2001 National Tidal Datum Epoch; mean higher high water is 4.1 ft above it and mean sea level 2.1 ft. These datums are controlled from NOAA's Port Chicago, CA gauge. Source: NOAA CO-OPS station 9415316, established 1978, gauge removed 1997. The tide times and heights are NOAA's official harmonic predictions for this station; TidalMap republishes them daily and does not alter them.
Tide stations near Rio Vista
- Threemile Slough: 2.7 mi, tides at about the same time
- Steamboat Slough, Snug Harbor Marina: 3.3 mi, tides about 43 min later
- Threemile Slough entrance: 4.0 mi, tides about 40 min later
- Korths Harbor, San Joaquin River: 7.5 mi, tides about 74 min later
- Dutch Slough: 9.7 mi, tides about 46 min later
TidalMapMonthly tide calendar
🌊 Biggest flood tides at Rio Vista this month: Nov 22, Nov 23, Nov 24, Nov 25, Nov 26, Nov 27. These spring highs push water up into the grass and over the oyster rock; prime for poling into flooded marsh for tailing reds.
🔻 Negative (minus) low tides at Rio Vista this month: Nov 1, Nov 2, Nov 7, Nov 8, Nov 9, Nov 10, Nov 12, Nov 13, Nov 14, Nov 15, Nov 23, Nov 24 …. These drain the flats and expose the oyster rock, prime for sight-fishing and clamming.
Best fishing times (solunar)
Major and minor solunar windows for Rio Vista, peak feeding activity is around the moon overhead/underfoot (majors) and moonrise/moonset (minors). Score is the day's activity coefficient (0–100).
| Day | Major windows | Minor windows | Score |
|---|---|---|---|
| Today 🌗 | 7:26–9:26 AM 7:51–9:51 PM | 12:58–2:58 AM 1:44–3:44 PM | 62 |
| Thu Nov 5 🌘 | 8:12–10:12 AM 8:37–10:37 PM | 2:06–4:06 AM 2:08–4:08 PM | 74 |
| Fri Nov 6 🌘 | 8:57–10:57 AM 9:22–11:22 PM | 3:12–5:12 AM 2:33–4:33 PM | 84 |
| Sat Nov 7 🌘 | 9:42–11:42 AM 10:07–12:07 AM | 4:17–6:17 AM 2:59–4:59 PM | 92 |
| Sun Nov 8 🌘 | 10:29–12:29 PM 10:54–12:54 AM | 5:22–7:22 AM 3:28–5:28 PM | 97 |
| Mon Nov 9 🌑 | 11:17–1:17 PM 11:42–1:42 AM | 6:26–8:26 AM 4:02–6:02 PM | 99 |
| Tue Nov 10 🌑 | 12:06–2:06 PM 12:31–2:31 AM | 7:27–9:27 AM 4:42–6:42 PM | 98 |
Predictions & observations: NOAA CO-OPS station 9415316. Solunar windows computed from the moon's position for this location. Times shown in the station's local time. Not for navigation.
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