Kirwin Reservoir — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Kirwin Reservoir, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Kirwin Reservoir today is 21.2°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 |
|---|---|---|---|
| JUN 2 | 21.2°C | 21.7°C | |
| JUN 3 | 20.4°C | 21.7°C | |
| JUN 4 | 20.0°C | 21.7°C | |
| JUN 5 | 20.1°C | 21.7°C | |
| JUN 6 | 20.1°C | 21.7°C | |
| JUN 7 | 20.8°C | 21.7°C | |
| JUN 8 | 20.9°C | 21.7°C | |
| JUN 10 | 21.7°C | 21.2°C | |
| JUN 11 | 21.7°C | 21.3°C | |
| JUN 12 | 21.7°C | 21.3°C | |
| JUN 13 | 21.7°C | 21.3°C | |
| JUN 14 | 21.7°C | 21.3°C | |
| JUN 15 | 21.7°C | 21.4°C | |
| JUN 16 | 21.7°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 | 0°C | 3°C | 6°C |
| March | 0°C | 8°C | 15°C |
| April | 7°C | 12°C | 18°C |
| May | 14°C | 18°C | 23°C |
| June | 19°C | 22°C | 24°C |
| July | 24°C | 27°C | 29°C |
| August | 23°C | 26°C | 28°C |
| September | 21°C | 24°C | 26°C |
| October | 12°C | 17°C | 22°C |
| November | 5°C | 11°C | 16°C |
| December | 1°C | 4°C | 7°C |
Kirwin Reservoir: Water Temperature by Location
Kirwin Reservoir: Weather Forecast
June 9
June 10
June 11
June 12
June 13
Location & Local Information
Kirwin Reservoir in north-central Kansas experiences a wide seasonal range of water temperatures. In winter the surface often cools to near freezing, roughly 34–40°F (1–4°C), and pockets of the lake can ice over during sustained cold spells. Spring sees a steady rise as runoff and warming air lift temperatures into the mid‑40s to mid‑60s°F (7–18°C), while summer surface temperatures commonly reach the 70s and low 80s°F, about 21–28°C, occasionally peaking near 85°F (29°C) in heat waves. In autumn the water cools back through the 60s and 50s°F (15–11°C) as air temperatures drop. Deeper water stays colder year‑round, so overall thermal conditions can vary by location and depth.
Swimming at Kirwin is generally possible but limited by the site’s management and natural conditions. The reservoir and surrounding lands are managed primarily for wildlife and recreation rather than as a staffed beach, so there are no lifeguards and few formal swimming facilities; visitors swim at their own risk and should follow posted refuge rules and seasonal closures. Cold water, sudden drop‑offs, submerged vegetation, and boat traffic are common hazards, and ice in winter makes swimming unsafe. In summer months, when surface temperatures are warmest, many people do swim, but caution and local information are recommended before entering the water.