Lake Forest water temp
This data the coastal Lake Forest water temperature today, tomorrow and the upcoming days. Besides, you can also get information about the weather and surf forecast, as well as the data on sunrise / sunset and moonrise / moonset at a given point on any given day.
Current water temperature in Lake Forest
Water temperature in Lake Forest today is 70.9°F. Based on our historical data over a period of ten years, the warmest water in this day in Lake Forest was recorded in 2024 and was 73.6°F, and the coldest was recorded in 2019 at 64°F. Water temperature in Lake Forest is expected to drop to 68.2°F in the next 10 days. September average water temperature in Lake Forest is 67.8°F, the minimum temperature is 49.8°F, and the maximum is 74.3°F.
The swimming season in Lake Forest lasts from July to September. During those months, Lake Forest water temperature does not drop below 68°F and therefore suitable for comfortable swimming. The average water temperature in Lake Forest in winter reaches 36.9°F, in spring 42.1°F, in summer the average temperature rises to 67.6°F, and in autumn it is 57.9°F.
Lake Forest water temperature now
| September 5, 2025 |
|---|
| today temp |
| 70.9°F |
| September 4, 2025 |
|---|
| yesterday temp |
| 71.1°F |
Surf Forecast in Lake Forest for today
Another important indicators for a comfortable holiday on the beach are the presence and height of the waves, as well as the speed and direction of the wind. Please find below data on the swell size for Lake Forest. We calculate the swell size based on the mean wave height (trough to crest) of each third highest wave. For more information on surf forecasts for the next ten days, please visit sea state forecast Lake Forest. Data in table shown for September 6, 2025, time in GMT 0 format (you can change the time zone on the sea state forecast page)
| 0-3 h | 3-6 h | 6-9 h | 9-12 h |
|---|---|---|---|
| 1' 6" | 2' 3" | 2' 9" | 3' 0" |
| 0.45 m | 0.68 m | 0.84 m | 0.92 m |
| 12-15 h | 15-18 h | 18-21 h | 21-24 h |
|---|---|---|---|
| 3' 5" | 3' 0" | 2' 7" | 2' 0" |
| 1.04 m | 0.92 m | 0.8 m | 0.6 m |
Surf report in Lake Forest
Lake Forest weather forecast
Current temperature and weather
Data in a table show Lake Forest temperature today (September 6, 2025). For more information and forecast for a few days, go to the weather forecast Lake Forest.
| 0-3 h | 3-6 h | 6-9 h | 9-12 h |
|---|---|---|---|
 |  | |  |
| 61.9°F | 61.5°F | 59.2°F | 59.7°F |
| 12-15 h | 15-18 h | 18-21 h | 21-24 h |
|---|---|---|---|
|  | | |
| 62.4°F | 64.8°F | 64.2°F | 59.7°F |
You may also be interested in other sections of our site for Lake Forest: Sunrise and Sunset, Tides
Lake Forest water temperature by month
These figures shows the average, minimum and maximum monthly water temperature in Lake Forest. In addition to the table values, the graph below displays of changes average surface temperature during the year. Values are calculated based on the data over the past 10 years. Using them, you can check the water temperature in Lake Forest on any day of this period that interests you. Click on the month link and you will see a table for each day, or alternatively you can view the temperature curve of the month and select 2 different years you want to compare, either in a table or as a curve
| Month | Avr | Min | Max | |
|---|---|---|---|---|
| January | 36°F | 30.7°F | 41.4°F | cold |
| Water temperature in Lake Forest in January | ||||
| February | 33.8°F | 30.4°F | 38.3°F | cold |
| Water temperature in Lake Forest in February | ||||
| March | 36.1°F | 31.3°F | 44.8°F | cold |
| Water temperature in Lake Forest in March | ||||
| April | 40.8°F | 34°F | 48.9°F | cold |
| Water temperature in Lake Forest in April | ||||
| May | 49.3°F | 41.4°F | 60.4°F | cold |
| Water temperature in Lake Forest in May | ||||
| June | 60.3°F | 49.8°F | 72.1°F | cold |
| Water temperature in Lake Forest in June | ||||
| July | 70.3°F | 60.8°F | 77.5°F | warm |
| Water temperature in Lake Forest in July | ||||
| August | 72.5°F | 67.1°F | 77.2°F | warm |
| Water temperature in Lake Forest in August | ||||
| September | 67.8°F | 49.8°F | 74.3°F | cold |
| Water temperature in Lake Forest in September | ||||
| October | 57.7°F | 45.3°F | 68.9°F | cold |
| Water temperature in Lake Forest in October | ||||
| November | 48°F | 38.3°F | 56.1°F | cold |
| Water temperature in Lake Forest in November | ||||
| December | 40.8°F | 33.4°F | 46.6°F | cold |
| Water temperature in Lake Forest in December | ||||
Chart monthly average water temperature in Lake Forest
