Griggs Reservoir — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Griggs Reservoir, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Griggs Reservoir today is 18.5°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
⚠️ As of today, the minimum water temperature ranges from 65°F (18°C) to 68°F (20°C). This is already quite warm water, which is ideal for most people. Swimming becomes comfortable, and prolonged stays in the water do not cause discomfort. This temperature is perfect for family trips and for those who prefer warmer water. It is also comfortable for water sports such as surfing or swimming. 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 6 | 20.1°C | 20.0°C | |
| OCT 7 | 20.2°C | 20.0°C | |
| OCT 8 | 19.3°C | 20.0°C | |
| OCT 9 | 19.4°C | 20.0°C | |
| OCT 10 | 19.2°C | 20.0°C | |
| OCT 11 | 18.6°C | 20.0°C | |
| OCT 12 | 18.6°C | 20.0°C | |
| OCT 14 | 20.0°C | 18.6°C | |
| OCT 15 | 20.0°C | 18.7°C | |
| OCT 16 | 20.0°C | 18.7°C | |
| OCT 17 | 20.0°C | 18.8°C | |
| OCT 18 | 20.0°C | 18.9°C | |
| OCT 19 | 20.0°C | 19.0°C | |
| OCT 20 | 20.0°C | 19.0°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 | 3°C | 5°C |
| February | 1°C | 3°C | 6°C |
| March | 2°C | 7°C | 12°C |
| April | 4°C | 11°C | 19°C |
| May | 13°C | 17°C | 22°C |
| June | 18°C | 22°C | 25°C |
| July | 22°C | 26°C | 30°C |
| August | 22°C | 26°C | 29°C |
| September | 21°C | 26°C | 30°C |
| October | 15°C | 20°C | 25°C |
| November | 6°C | 11°C | 15°C |
| December | 2°C | 7°C | 10°C |
Griggs Reservoir: Water Temperature by Location
Griggs Reservoir: Weather Forecast
October 13
October 14
October 15
October 16
October 17
October 18
Location & Local Information
Griggs Reservoir, part of the water supply system near Columbus, Ohio, shows a typical temperate-reservoir pattern of seasonal surface temperatures. In winter the surface often approaches freezing, roughly 32–40°F (0–4°C). Spring sees a steady rise, generally in the 40–65°F (4–18°C) range as the water mixes and warms. During summer the surface commonly reaches about 68–80°F (20–27°C), with occasional warm spells pushing slightly higher; below the surface the water can remain substantially cooler, often 40–55°F (4–13°C) in deeper layers due to stratification. In autumn the reservoir cools again, falling back through 50–68°F (10–20°C) as turnover returns the water column to a more uniform temperature.
Open-water swimming at Griggs Reservoir is generally not permitted. The reservoir functions primarily as a municipal water source, and limiting direct human contact helps protect drinking-water quality, reduces contamination risk, and supports reservoir management. Safety is another concern: there are no staffed beaches or lifeguards, and boating, variable depths, and colder hypolimnetic water can create hazardous conditions for swimmers. For those seeking warm-water swimming opportunities, local public pools and designated recreational lakes or state-park beaches in the region provide safer, regulated alternatives.