Tides Today & Tomorrow in Rio Vista, CA

TIDE TIMES for Wednesday, August 12, 2026
The tide is currently rising in Rio Vista, CA.
Next low tide : 10:41 pm (1.5 ft)
Next high tide : in 1h 02m at 4:59 pm (3.4 ft)
Sunset today : 8:04 pm
Sunrise tomorrow : 6:19 am
Moon phase : New Moon (0% illuminated)
Tide Station Location : Station #9415316
Common Questions About Tides

Rio Vista, CA Tides - Jun 1948

DateHigh TideLow TideSunMoonDate
AMftPMftAMftPMftRiseSet
1Tue12:053.612:012.46:381.26:070.75:458:23Third Quarter1Tue
2Wed12:393.71:112.37:400.96:430.95:448:24Waning Crescent2Wed
3Thu1:073.82:122.38:370.77:191.15:448:25Waning Crescent3Thu
4Fri1:303.93:102.39:280.47:561.45:448:25Waning Crescent4Fri
5Sat1:534.04:072.310:160.18:381.65:438:26New Moon5Sat
6Sun2:214.25:052.311:00-0.19:271.75:438:27New Moon6Sun
7Mon2:574.46:002.411:43-0.310:221.85:438:27New Moon7Mon
8Tue3:394.56:512.612:25-0.55:438:28New Moon8Tue
9Wed4:264.57:382.71:07-0.55:438:28Waxing Crescent9Wed
10Thu5:184.38:222.912:171.71:50-0.55:438:29Waxing Crescent10Thu
11Fri6:144.19:053.21:181.72:35-0.45:428:29Waxing Crescent11Fri
12Sat7:173.89:503.42:241.63:20-0.25:428:30First Quarter12Sat
13Sun8:303.410:363.73:361.44:070.05:428:30First Quarter13Sun
14Mon9:523.011:223.94:511.24:540.25:428:31First Quarter14Mon
15Tue11:152.76:040.95:400.55:428:31First Quarter15Tue
16Wed12:074.112:332.67:140.56:260.85:438:31Waxing Gibbous16Wed
17Thu12:494.31:432.58:180.27:111.15:438:32Waxing Gibbous17Thu
18Fri1:274.42:472.59:16-0.27:561.35:438:32Waxing Gibbous18Fri
19Sat2:034.43:482.510:08-0.48:431.65:438:32Full Moon19Sat
20Sun2:374.44:472.610:56-0.69:311.85:438:32Full Moon20Sun
21Mon3:104.45:422.711:39-0.710:212.05:438:33Full Moon21Mon
22Tue3:434.36:322.912:19-0.75:448:33Full Moon22Tue
23Wed4:204.27:173.012:56-0.65:448:33Waning Gibbous23Wed
24Thu4:594.07:573.21:31-0.55:448:33Waning Gibbous24Thu
25Fri5:423.88:353.312:472.02:04-0.35:448:33Waning Gibbous25Fri
26Sat6:293.69:133.41:391.92:37-0.15:458:33Waning Gibbous26Sat
27Sun7:213.39:503.52:361.93:090.25:458:33Third Quarter27Sun
28Mon8:232.910:263.63:411.83:420.45:468:33Third Quarter28Mon
29Tue9:482.611:013.74:521.64:170.75:468:33Third Quarter29Tue
30Wed11:222.311:323.96:051.44:540.95:468:33Third 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 7:50 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 spring phase. Tonight's moon is 0% 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 maximum.

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 New Moon (0% illuminated). This places Rio Vista, CA in a spring tide cycle, so tidal ranges are near their weekly maximum 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