Tides Today & Tomorrow in Rio Vista, CA

TIDE TIMES for Tuesday, July 21, 2026
The tide is currently rising in Rio Vista, CA.
Next low tide (tomorrow) : 6:09 am (0.8 ft)
Next high tide : in 5h 48m at 10:33 pm (4.2 ft)
Sunset today : 8:25 pm
Sunrise tomorrow : 6:00 am
Moon phase : First Quarter (53% illuminated)
Tide Station Location : Station #9415316
Common Questions About Tides

Rio Vista, CA Tides - Jan 1982

DateHigh TideLow TideSunMoonDate
AMftPMftAMftPMftRiseSet
1Fri8:123.37:043.41:550.22:021.67:234:57First Quarter1Fri
2Sat8:523.58:213.12:380.43:191.57:234:58First Quarter2Sat
3Sun9:353.79:582.83:240.64:411.37:234:59First Quarter3Sun
4Mon10:223.911:252.74:140.85:571.07:235:00First Quarter4Mon
5Tue11:094.25:061.07:060.67:235:01Waxing Gibbous5Tue
6Wed12:382.711:56 AM4.46:001.28:070.27:235:01Waxing Gibbous6Wed
7Thu1:422.712:434.66:561.39:02-0.17:235:02Waxing Gibbous7Thu
8Fri2:422.81:304.77:561.59:53-0.37:235:03Full Moon8Fri
9Sat3:392.82:174.68:551.510:41-0.47:235:04Full Moon9Sat
10Sun4:343.03:064.69:531.611:25-0.47:235:05Full Moon10Sun
11Mon5:273.13:574.410:491.67:225:06Waning Gibbous11Mon
12Tue6:163.34:504.112:08-0.311:44 AM1.67:225:07Waning Gibbous12Tue
13Wed7:033.45:483.912:49-0.112:421.67:225:08Waning Gibbous13Wed
14Thu7:483.56:513.51:290.11:431.57:225:09Waning Gibbous14Thu
15Fri8:343.78:023.22:100.32:501.57:215:10Third Quarter15Fri
16Sat9:213.89:173.02:510.63:591.37:215:11Third Quarter16Sat
17Sun10:083.910:312.83:340.85:081.17:215:12Third Quarter17Sun
18Mon10:544.011:402.84:191.16:110.87:205:13Third Quarter18Mon
19Tue11:374.15:061.37:090.57:205:14Waning Crescent19Tue
20Wed12:412.812:174.25:531.58:000.37:195:16Waning Crescent20Wed
21Thu1:362.912:534.26:401.68:450.17:195:17Waning Crescent21Thu
22Fri2:263.01:264.27:281.79:270.07:185:18Waning Crescent22Fri
23Sat3:113.01:564.28:151.710:040.07:185:19New Moon23Sat
24Sun3:533.12:274.29:001.710:380.17:175:20New Moon24Sun
25Mon4:303.13:004.29:421.711:100.17:165:21New Moon25Mon
26Tue5:033.23:384.210:241.611:400.27:165:22New Moon26Tue
27Wed5:333.34:204.111:051.57:155:23Waxing Crescent27Wed
28Thu6:013.45:074.012:100.311:49 AM1.57:145:24Waxing Crescent28Thu
29Fri6:313.56:003.812:410.412:381.47:135:26Waxing Crescent29Fri
30Sat7:063.77:023.51:160.51:391.47:135:27Waxing Crescent30Sat
31Sun7:483.98:213.11:570.72:571.37:125:28First Quarter31Sun
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 2:21 am — 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 53% 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 (53% 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