Crystal River Water Temperature
Updated Tue 14:53 (America/New_York)
USA · Forecast updated Sep 22, 2026, 14:53 UTC · refresh delayed
Current Sea Temperature
30.1°C
86.2°F
Very warm water
Valid Sep 22, 2026, 14:53 (America/New_York). Source: stored Open-Meteo marine forecast. Temperature is not a safety rating or snorkel score.
Versus this month's average
0.4°C above
The typical September average is 29.7°C (85.5°F) from the historical baseline.
Recent trend
Cooling by 0.6°C
Seven-day average: 30.4°C, versus 31.0°C in the prior seven days.
What to wear
Very warm water
Swimwear is usually enough; a rash guard adds sun protection.
Cold tolerance varies. Wind, session length, sunshine, and exertion also affect comfort; temperature alone does not describe sea conditions or replace the snorkel forecast.
Typical Sea Temperature Over the Year
In the historical baseline for Crystal River, typical monthly averages range from about 14.4°C (57.9°F) in January to 31.5°C (88.7°F) in August.
Over the past 30 days, the average sea temperature in Crystal River has been 31.0°C.
Historical baseline (full year)
Northern Hemisphere. Summer is generally June–August; winter is December–February.
Typical monthly sea-surface temperature near Crystal River, calculated from hourly observations for 2023–2025. This is not this site's forecast archive.
| Month | Typical range | Average |
|---|---|---|
| January | 13.4–15.2°C | 14.4°C / 57.9°F |
| February | 16.1–18.3°C | 17.2°C / 63.0°F |
| March | 19.2–22.4°C | 21.0°C / 69.8°F |
| April | 23.0–24.7°C | 24.0°C / 75.2°F |
| May | 26.6–28.1°C | 27.5°C / 81.5°F |
| June | 28.8–30.4°C | 29.8°C / 85.6°F |
| July | 30.9–32.0°C | 31.4°C / 88.5°F |
| August | 30.9–32.2°C | 31.5°C / 88.7°F |
| September | 29.0–30.2°C | 29.7°C / 85.5°F |
| October | 25.3–26.1°C | 25.7°C / 78.3°F |
| November | 20.4–23.3°C | 21.8°C / 71.2°F |
| December | 16.2–18.3°C | 17.2°C / 63.0°F |
Source: Open-Meteo Marine API, MeteoFrance sea-surface temperature dataset. Nearest sea grid cell (28.88, -82.71). Each month is the mean of yearly monthly means; the range is the lowest and highest of those yearly monthly means. Open-Meteo methodology.
Water temperature by month
Each month uses the 2023–2025 baseline. The range is the lowest and highest yearly monthly mean, not an hourly extreme.
Crystal River in January
Typical January water temperature near Crystal River is 14.4°C (57.9°F), with yearly monthly means from 13.4–15.2°C.
Crystal River in February
Typical February water temperature near Crystal River is 17.2°C (63.0°F), with yearly monthly means from 16.1–18.3°C.
Crystal River in March
Typical March water temperature near Crystal River is 21.0°C (69.8°F), with yearly monthly means from 19.2–22.4°C.
Crystal River in April
Typical April water temperature near Crystal River is 24.0°C (75.2°F), with yearly monthly means from 23.0–24.7°C.
Crystal River in May
Typical May water temperature near Crystal River is 27.5°C (81.5°F), with yearly monthly means from 26.6–28.1°C.
Crystal River in June
Typical June water temperature near Crystal River is 29.8°C (85.6°F), with yearly monthly means from 28.8–30.4°C.
Crystal River in July
Typical July water temperature near Crystal River is 31.4°C (88.5°F), with yearly monthly means from 30.9–32.0°C.
Crystal River in August
Typical August water temperature near Crystal River is 31.5°C (88.7°F), with yearly monthly means from 30.9–32.2°C.
Crystal River in September
Typical September water temperature near Crystal River is 29.7°C (85.5°F), with yearly monthly means from 29.0–30.2°C.
Crystal River in October
Typical October water temperature near Crystal River is 25.7°C (78.3°F), with yearly monthly means from 25.3–26.1°C.
Crystal River in November
Typical November water temperature near Crystal River is 21.8°C (71.2°F), with yearly monthly means from 20.4–23.3°C.
Crystal River in December
Typical December water temperature near Crystal River is 17.2°C (63.0°F), with yearly monthly means from 16.2–18.3°C.
Forecast archive (growing)
These values come from hourly forecasts SnorkelForecast has stored. They cover only months with records and do not replace the historical baseline.
| Month | Min | Average | Max |
|---|---|---|---|
| June | 28.5°C / 83.3°F | 30.3°C / 86.6°F | 32.3°C / 90.1°F |
| July | 30.6°C / 87.1°F | 31.8°C / 89.2°F | 32.9°C / 91.2°F |
| August | 29.9°C / 85.8°F | 31.2°C / 88.2°F | 32.4°C / 90.3°F |
| September | 29.5°C / 85.1°F | 30.8°C / 87.4°F | 31.7°C / 89.1°F |
Partial coverage: 4 calendar months with records. Profile calculated from 2735 hourly forecast records across 4 monthly periods. This is a growing archive, not a long-term climate normal.
About the water at Crystal River
Spring-fed Gulf coast river where you can snorkel alongside wintering manatees.
- Area
- Florida
Crystal River Water Temperature: Common Questions
What is the water temperature in Crystal River today?
The current sea surface temperature near Crystal River is 30.1°C (86.2°F). Over the last 30 days, the average has been 31.0°C.
When is the water warmest in Crystal River?
The water is typically warmest in August, at around 31.5°C (88.7°F) in the 2023–2025 historical baseline.
When is the water coldest in Crystal River?
The water is typically coldest in January, at around 14.4°C (57.9°F) in the same historical baseline. A wetsuit is usually recommended during this period.
Can you swim in Crystal River today?
At 30.1°C, the water is usually comfortable for swimming and snorkeling.
Full Snorkeling Forecast
See how today's sea temperature, wave height, wind, and tides combine into a detailed snorkeling score for Crystal River.
View Snorkel Forecast →