Coralville Lake — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Coralville Lake, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Coralville Lake today is 9.5°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
❌ As of today, the minimum water temperature ranges from 47°F (8°C) to 50°F (10°C). This is still cool water, suitable only for experienced swimmers or those accustomed to cold water. Swimming in such conditions is possible, but not recommended for prolonged periods. Extra caution should be taken during extended exposure, as the cold water can cause heat loss and lead to hypothermia. For added comfort, special clothing can be used. It is important to note that these swimming tips and recommendations apply only in good weather. When the air temperature is below 68°F (20°C), and sometimes even below 77°F (25°C), swimming can be unpleasant even with relatively high water temperatures.
Water Temperature Chart Over the Last 30 Days
Table of Daily Sea Temperature Data
| Date | Current | Average | Forecast |
|---|---|---|---|
| OCT 26 | 11.9°C | 17.5°C | |
| OCT 27 | 12.0°C | 17.5°C | |
| OCT 28 | 12.0°C | 17.5°C | |
| OCT 29 | 11.4°C | 17.5°C | |
| OCT 30 | 11.0°C | 17.5°C | |
| OCT 31 | 11.7°C | 17.5°C | |
| NOV 1 | 10.5°C | 10.0°C | |
| NOV 2 | 9.5°C | 10.0°C | |
| NOV 3 | 10.0°C | 9.5°C | |
| NOV 4 | 10.0°C | 9.6°C | |
| NOV 5 | 10.0°C | 9.6°C | |
| NOV 6 | 10.0°C | 9.6°C | |
| NOV 7 | 10.0°C | 9.6°C | |
| NOV 8 | 10.0°C | 9.7°C | |
| NOV 9 | 10.0°C | 9.7°C |
* Current - Actual water temperature value
** Average - Average water temperature on this day in recent years
*** Forecast - Our water temperature forecast
Actual nearshore water temperatures may fluctuate by several degrees from the reported values, especially following heavy rainfall or extended periods of strong winds. Certain wind patterns can cause colder, deeper waters to rise and replace the sun-warmed surface water, leading to noticeable variations.
Our forecast is based on a proprietary mathematical model that considers real-time water temperature changes, historical trends, key weather patterns, wind strength and direction, and air temperature specific to each region. Additionally, we incorporate data from other resorts to enhance accuracy.
Monthly Water Temperature Range (Min, Max & Average)
| Month | Min | Avg | Max |
|---|---|---|---|
| January | 0°C | 2°C | 5°C |
| February | 2°C | 5°C | 7°C |
| March | 3°C | 7°C | 11°C |
| April | 5°C | 10°C | 16°C |
| May | 11°C | 17°C | 23°C |
| June | 16°C | 20°C | 25°C |
| July | 23°C | 26°C | 30°C |
| August | 21°C | 25°C | 29°C |
| September | 20°C | 23°C | 26°C |
| October | 13°C | 18°C | 22°C |
| November | 3°C | 10°C | 17°C |
| December | 0°C | 3°C | 6°C |
Coralville Lake: Water Temperature by Location
Coralville Lake: Weather Forecast
November 3
November 4
November 5
November 6
November 7
November 8
Location & Local Information
Coralville Lake, a reservoir on the Iowa River near Coralville, experiences a wide range of surface-water temperatures through the year. In winter the surface often approaches freezing, roughly 32–40°F (0–4°C). Spring warms from about 40–60°F (4–16°C) as air temperatures rise and runoff increases. Peak summer surface temperatures typically fall in the 68–82°F range (20–28°C), with the warmest late-July and August waters providing the most comfortable conditions for bathing. In autumn the lake cools back toward 50–65°F (10–18°C) as nights shorten and winds increase. These are general seasonal ranges; actual temperatures vary with depth, recent weather, and reservoir operations.
Swimming at Coralville Lake is permitted in many of the Corps-managed recreation areas and swim beaches, and people commonly swim there during warm months because summer water temperatures are generally comfortable. However, swimming is often unguarded and conditions can be hazardous outside of calm summer days: cold water shock in spring or fall, sudden drop-offs, boat traffic, submerged debris, and occasional water-quality advisories (including algal blooms) can make swimming unsafe. Visitors should heed posted rules and advisories and choose supervised or designated swim areas when available.