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 20.8°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
✅ As of today, the minimum water temperature ranges from 68°F (20°C) to 74°F (23°C). The water is warm and pleasant for swimming, and in this range, one can stay in the water for extended periods without the risk of hypothermia. This is the ideal temperature for relaxation, swimming, and water sports. Families with children, as well as outdoor enthusiasts, will enjoy swimming and time spent in the water. For most people, this is the optimal temperature for a comfortable beach experience. 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 |
|---|---|---|---|
| SEP 14 | 21.5°C | 22.6°C | |
| SEP 15 | 21.2°C | 22.6°C | |
| SEP 16 | 20.5°C | 22.6°C | |
| SEP 17 | 20.9°C | 22.6°C | |
| SEP 18 | 20.3°C | 22.6°C | |
| SEP 19 | 20.6°C | 22.6°C | |
| SEP 20 | 20.2°C | 22.6°C | |
| SEP 21 | 20.8°C | 22.6°C | |
| SEP 22 | 22.6°C | 20.9°C | |
| SEP 23 | 22.6°C | 21.0°C | |
| SEP 24 | 22.6°C | 21.1°C | |
| SEP 25 | 22.6°C | 21.2°C | |
| SEP 26 | 22.6°C | 21.3°C | |
| SEP 27 | 22.6°C | 21.3°C | |
| SEP 28 | 22.6°C | 21.4°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
September 21
September 22
September 23
September 24
September 25
September 26
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.