Tides Today & Tomorrow in Rio Vista, CA

TIDE TIMES for Wednesday, August 19, 2026
The tide is currently falling in Rio Vista, CA.
Next low tide : in 2h 13m at 2:57 pm (1.5 ft)
Next high tide : 9:26 pm (4.0 ft)
Sunset today : 7:55 pm
Sunrise tomorrow : 6:25 am
Moon phase : First Quarter (47% illuminated)
Tide Station Location : Station #9415316
Common Questions About Tides

Rio Vista, CA Tides - Jun 1937

DateHigh TideLow TideSunMoonDate
AMftPMftAMftPMftRiseSet
1Tue7:253.09:243.52:431.42:550.34:457:23Third Quarter1Tue
2Wed8:442.710:033.73:541.23:390.54:447:24Third Quarter2Wed
3Thu10:212.510:433.95:081.04:250.74:447:25Third Quarter3Thu
4Fri11:472.411:244.26:190.65:130.94:447:25Waning Crescent4Fri
5Sat12:592.37:250.36:051.24:437:26Waning Crescent5Sat
6Sun12:074.32:052.48:25-0.17:031.44:437:26Waning Crescent6Sun
7Mon12:514.53:082.59:20-0.48:071.54:437:27New Moon7Mon
8Tue1:374.54:092.610:10-0.69:111.64:437:28New Moon8Tue
9Wed2:254.55:062.810:58-0.710:121.64:437:28New Moon9Wed
10Thu3:154.45:593.011:43-0.711:111.64:437:29Waxing Crescent10Thu
11Fri4:084.16:473.212:26-0.64:427:29Waxing Crescent11Fri
12Sat5:033.87:333.412:101.51:08-0.54:427:30Waxing Crescent12Sat
13Sun6:033.58:193.61:111.41:50-0.24:427:30Waxing Crescent13Sun
14Mon7:113.19:043.82:161.32:320.04:427:30First Quarter14Mon
15Tue8:252.89:493.93:231.23:140.34:427:31First Quarter15Tue
16Wed9:422.610:344.04:321.03:560.64:427:31First Quarter16Wed
17Thu10:572.411:164.15:380.74:390.94:437:31Waxing Gibbous17Thu
18Fri12:062.46:390.35:221.14:437:32Waxing Gibbous18Fri
19Sat1:082.57:350.16:061.44:437:32Waxing Gibbous19Sat
20Sun12:324.22:042.58:24-0.26:521.64:437:32Waxing Gibbous20Sun
21Mon1:054.22:562.69:09-0.37:411.74:437:33Waxing Gibbous21Mon
22Tue1:354.23:442.79:49-0.48:301.84:437:33Full Moon22Tue
23Wed2:034.14:282.810:26-0.49:181.84:447:33Full Moon23Wed
24Thu2:334.15:083.011:00-0.310:041.84:447:33Full Moon24Thu
25Fri3:074.05:433.111:31-0.310:481.74:447:33Full Moon25Fri
26Sat3:464.06:153.212:00-0.24:457:33Waning Gibbous26Sat
27Sun4:293.96:453.412:29-0.14:457:33Waning Gibbous27Sun
28Mon5:163.77:153.512:201.512:590.04:457:33Waning Gibbous28Mon
29Tue6:093.47:483.71:141.51:320.24:467:33Third Quarter29Tue
30Wed7:103.18:263.92:181.42:100.44:467:33Third Quarter30Wed
DateHigh TideLow TideSunMoonDate
AMftPMftAMftPMftRiseSet
Tidal Data Source: (9415316)

Common Questions About Rio Vista, CA Tides

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What time does the tide turn (slack tide) in Rio Vista, CA today?

Slack tide in Rio Vista, CA is approximately 6:11 pm — midway between the next high and low tide, when tidal current is weakest. This is the preferred window for boat crossings, underwater visibility, and fishing in areas with strong currents.

Is this week a spring tide or neap tide in Rio Vista, CA?

Rio Vista, CA is currently in a neap phase. Tonight's moon is 47% illuminated. Spring tides (largest swings) occur near new and full moons; neap tides (smallest swings) occur near first and third quarter moons. Tidal ranges this week are near their weekly minimum.

What datum are Rio Vista, CA tide heights measured from?

Tide heights on this page are measured from Mean Lower Low Water (MLLW), the U.S. NOAA standard. A height of 0 ft represents the 19-year average of each day's lower low tide. Negative values indicate a "minus tide" — water levels below that long-term reference.

What factors can affect the tide predictions for Rio Vista, CA?

Tide predictions for Rio Vista, CA come from NOAA's harmonic analysis and are typically accurate within about ±10 minutes on timing and ±0.5 ft on height. Actual water levels can deviate further due to sustained winds, atmospheric pressure changes, river flow, and storm surge. During major weather events, be sure to check US Harbors weather pages for factors that could impact tidal predictions.

Which NOAA station provides tide data for Rio Vista, CA?

Tide data for Rio Vista, CA is sourced from NOAA Station #9415316. View the official NOAA station page at https://tidesandcurrents.noaa.gov/stationhome.html?id=9415316.

What is the moon phase in Rio Vista, CA tonight?

Tonight the moon over Rio Vista, CA is First Quarter (47% illuminated). This places Rio Vista, CA in a neap tide cycle, so tidal ranges are near their weekly minimum this week.

US Harbors Tidal Data

The data in our tide charts, tide tables, and tide graphs is provided by NOAA and others. These predictions are derived mathematically from numerous inputs, including data from historical tide stations and nearby locations where sensors are actively recording. As shown in the tide graph at the top of this page, “Predicted” tides (blue) are what forecasting models expect to happen. “Observed” tides (red) are those recorded by local sensors in real time, overlaid on the predictions for direct comparison. We display Observed water levels for a select group of harbors including Portland, Maine, where a physical sensor monitors water levels in real time.

LEARN MORE ABOUT OUR TIDE DATA