Allentown — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Allentown, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Allentown today is 21°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 |
|---|---|---|---|
| AUG 25 | 22.1°C | 20.7°C | |
| AUG 26 | 22.0°C | 20.7°C | |
| AUG 27 | 22.0°C | 20.7°C | |
| AUG 28 | 21.8°C | 20.7°C | |
| AUG 29 | 21.9°C | 20.7°C | |
| AUG 30 | 20.8°C | 20.7°C | |
| AUG 31 | 20.9°C | 20.7°C | |
| SEP 1 | 21.0°C | 16.0°C | |
| SEP 2 | 16.0°C | 20.8°C | |
| SEP 3 | 16.0°C | 20.5°C | |
| SEP 4 | 16.0°C | 20.3°C | |
| SEP 5 | 16.0°C | 20.0°C | |
| SEP 6 | 16.0°C | 19.8°C | |
| SEP 7 | 16.0°C | 19.5°C | |
| SEP 8 | 16.0°C | 19.3°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 | 1°C | 5°C | 9°C |
| February | 1°C | 5°C | 9°C |
| March | 3°C | 7°C | 11°C |
| April | 5°C | 10°C | 16°C |
| May | 8°C | 13°C | 21°C |
| June | 14°C | 19°C | 22°C |
| July | 17°C | 21°C | 26°C |
| August | 17°C | 21°C | 25°C |
| September | 11°C | 16°C | 21°C |
| October | 8°C | 14°C | 19°C |
| November | 3°C | 8°C | 16°C |
| December | 2°C | 6°C | 8°C |
Allentown: Weather Forecast
September 2
September 3
September 4
September 5
September 6
Location & Local Information
In Allentown, Pennsylvania, the Lehigh River is a prominent feature that runs through the city, providing a picturesque setting for outdoor activities. The temperature of the river water in this area is typically cool, especially during the spring and fall seasons. During summer, the water temperature generally ranges between 60°F and 70°F (15°C to 21°C). While this range may feel refreshing, it is too cold for comfortable, extended swimming for most people. The temperature fluctuates with seasonal changes, and colder temperatures are common during the early spring and late fall due to upstream water flows and weather patterns.
Swimming in the Lehigh River in Allentown is not a popular activity, mainly because of the river’s cold water and fast-moving currents. While some may choose to wade in the shallower, calmer sections, swimming is not generally recommended due to safety concerns related to the currents and the river's overall flow. The Lehigh River, especially in Allentown, is better known for activities like kayaking, fishing, and canoeing, which are enjoyed by residents and visitors in various sections of the river. The natural beauty and recreational potential make it a great spot for these activities, but the conditions are less ideal for swimming.
For swimming, residents of Allentown often look to other local options like swimming pools or nearby lakes. These locations typically offer more controlled, warmer environments for swimming. The cooler Lehigh River, combined with its faster currents, makes it more suitable for water sports and scenic relaxation rather than traditional swimming.