Tides Today & Tomorrow in Rio Vista, CA

TIDE TIMES for Friday, August 7, 2026
The tide is currently falling in Rio Vista, CA.
Next low tide : in 1h 54m at 4:50 pm (1.6 ft)
Next high tide : 10:57 pm (4.5 ft)
Sunset today : 8:10 pm
Sunrise tomorrow : 6:15 am
Moon phase : Third Quarter (31% illuminated)
Tide Station Location : Station #9415316
Common Questions About Tides

Rio Vista, CA Tides - Jan 1957

DateHigh TideLow TideSunMoonDate
AMftPMftAMftPMftRiseSet
1Tue4:133.12:584.19:341.611:02-0.27:234:57New Moon1Tue
2Wed4:553.13:354.010:181.611:36-0.17:234:58New Moon2Wed
3Thu5:353.24:133.911:001.67:234:59Waxing Crescent3Thu
4Fri6:133.34:543.712:070.011:44 AM1.67:235:00Waxing Crescent4Fri
5Sat6:503.45:383.412:370.212:311.67:235:01Waxing Crescent5Sat
6Sun7:253.56:293.21:070.41:251.67:235:02Waxing Crescent6Sun
7Mon8:003.57:362.91:390.62:301.57:235:02First Quarter7Mon
8Tue8:373.69:072.62:170.83:441.57:235:03First Quarter8Tue
9Wed9:163.710:332.53:011.04:581.37:235:04First Quarter9Wed
10Thu9:593.811:462.53:501.26:051.07:235:05First Quarter10Thu
11Fri10:454.04:431.37:040.77:235:06Waxing Gibbous11Fri
12Sat12:472.611:32 AM4.25:391.57:570.47:225:07Waxing Gibbous12Sat
13Sun1:402.712:214.46:381.58:450.27:225:08Waxing Gibbous13Sun
14Mon2:282.81:104.57:381.59:300.17:225:09Full Moon14Mon
15Tue3:132.92:004.58:371.410:120.07:215:10Full Moon15Tue
16Wed3:563.12:514.59:351.310:530.07:215:11Full Moon16Wed
17Thu4:383.23:444.410:311.211:330.07:215:12Full Moon17Thu
18Fri5:223.44:404.211:271.17:205:14Waning Gibbous18Fri
19Sat6:063.65:403.912:120.112:261.17:205:15Waning Gibbous19Sat
20Sun6:523.86:443.612:520.31:291.07:195:16Waning Gibbous20Sun
21Mon7:414.07:553.21:340.52:371.07:195:17Third Quarter21Mon
22Tue8:334.09:113.02:190.83:480.97:185:18Third Quarter22Tue
23Wed9:294.110:272.93:101.04:580.77:185:19Third Quarter23Wed
24Thu10:254.111:372.94:051.26:030.57:175:20Waning Crescent24Thu
25Fri11:194.25:031.47:020.27:165:21Waning Crescent25Fri
26Sat12:383.012:094.26:021.57:530.17:165:22Waning Crescent26Sat
27Sun1:313.112:544.26:581.68:390.07:155:23Waning Crescent27Sun
28Mon2:193.21:364.27:501.69:200.07:145:25New Moon28Mon
29Tue3:023.32:154.18:391.69:570.17:135:26New Moon29Tue
30Wed3:413.42:544.09:241.510:310.27:135:27New Moon30Wed
31Thu4:183.43:323.910:071.511:020.37:125:28New Moon31Thu
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 7:53 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 transitional phase. Tonight's moon is 31% 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 shifting between spring and neap.

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 Third Quarter (31% illuminated). This places Rio Vista, CA in a transitional tide cycle, so tidal ranges are shifting between spring and neap 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