Clear Lake — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Clear Lake, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Clear Lake today is 26.7°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
✅ As of today, the minimum water temperature ranges from 79°F (26°C) to 82°F (28°C). This is very warm water, allowing for extended stays without any discomfort. Swimming in these conditions will be particularly enjoyable, making it the ideal temperature range for those who want to relax in the sea. Additionally, water in this temperature range is suitable for children and elderly people, as it is comfortable for prolonged stays. 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 |
|---|---|---|---|
| JUL 14 | 24.9°C | 25.5°C | |
| JUL 15 | 27.4°C | 25.5°C | |
| JUL 16 | 27.2°C | 25.5°C | |
| JUL 17 | 27.3°C | 25.5°C | |
| JUL 18 | 26.8°C | 25.5°C | |
| JUL 19 | 26.9°C | 25.5°C | |
| JUL 20 | 26.9°C | 25.5°C | |
| JUL 21 | 26.8°C | 25.5°C | |
| JUL 22 | 25.5°C | 26.6°C | |
| JUL 23 | 25.5°C | 26.6°C | |
| JUL 24 | 25.5°C | 26.5°C | |
| JUL 25 | 25.5°C | 26.5°C | |
| JUL 26 | 25.5°C | 26.4°C | |
| JUL 27 | 25.5°C | 26.3°C | |
| JUL 28 | 25.5°C | 26.3°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 | 1°C | 4°C |
| February | 1°C | 3°C | 6°C |
| March | 1°C | 4°C | 7°C |
| April | 4°C | 9°C | 14°C |
| May | 9°C | 15°C | 22°C |
| June | 16°C | 20°C | 24°C |
| July | 22°C | 26°C | 28°C |
| August | 20°C | 23°C | 25°C |
| September | 18°C | 21°C | 23°C |
| October | 9°C | 15°C | 20°C |
| November | 3°C | 7°C | 11°C |
| December | 1°C | 3°C | 6°C |
Clear Lake: Water Temperature by Location
Clear Lake: Weather Forecast
July 22
July 23
July 24
July 25
July 26
Location & Local Information
Clear Lake in north-central Iowa experiences wide seasonal swings in surface water temperature. In spring the lake typically ranges from about 45–60°F (7–16°C) as waters warm after ice-out, rising in summer to roughly 70–80°F (21–27°C) on average and occasionally into the mid-80s°F (around 29°C) on hot spells. Early fall brings cooling waters, commonly 50–65°F (10–18°C), and by late fall and winter the surface often approaches freezing, roughly 32–40°F (0–4°C), with ice cover possible during sustained cold periods. These figures refer to surface conditions; deeper layers remain cooler and change less quickly than the surface.
Swimming at Clear Lake is permitted in designated beach and park areas during the warmer months, with local authorities and park managers setting seasonal rules and posting advisories. Lifeguard coverage, posted hours, and access points vary, and water quality is routinely monitored; swimming may be temporarily restricted after heavy rains or when bacterial counts or harmful algal blooms (cyanobacteria) present a health risk. Cold-season activities such as ice fishing occur when conditions are safe, but winter swimming carries hypothermia and thin-ice dangers and is generally discouraged except in organized, well-prepared events with proper safety measures.