Ashley Lake — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Ashley Lake, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Ashley Lake today is 19.5°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 |
|---|---|---|---|
| JUL 14 | 15.1°C | 17.8°C | |
| JUL 15 | 17.0°C | 17.8°C | |
| JUL 16 | 17.1°C | 17.8°C | |
| JUL 17 | 16.9°C | 17.8°C | |
| JUL 18 | 19.3°C | 17.8°C | |
| JUL 19 | 20.8°C | 17.8°C | |
| JUL 20 | 20.9°C | 17.8°C | |
| JUL 21 | 19.6°C | 17.8°C | |
| JUL 22 | 17.8°C | 19.4°C | |
| JUL 23 | 17.8°C | 19.3°C | |
| JUL 24 | 17.8°C | 19.2°C | |
| JUL 25 | 17.8°C | 19.2°C | |
| JUL 26 | 17.8°C | 19.1°C | |
| JUL 27 | 17.8°C | 19.0°C | |
| JUL 28 | 17.8°C | 18.9°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 | 0°C | 3°C | 5°C |
| March | 0°C | 4°C | 6°C |
| April | 1°C | 4°C | 6°C |
| May | 3°C | 9°C | 15°C |
| June | 10°C | 14°C | 18°C |
| July | 14°C | 18°C | 21°C |
| August | 18°C | 22°C | 25°C |
| September | 15°C | 18°C | 20°C |
| October | 7°C | 12°C | 16°C |
| November | 2°C | 6°C | 9°C |
| December | 0°C | 2°C | 5°C |
Ashley Lake: Water Temperature by Location
Ashley Lake: Weather Forecast
July 22
July 23
July 24
July 25
July 26
Location & Local Information
Ashley Lake in Montana is a typical cold, mountain-fed body of water, so its temperatures vary strongly by season and depth. In spring (late May–June) surface readings commonly range from about 40–55°F (4–13°C) as snowmelt cools the lake; midsummer (July–August) surface temperatures can warm to roughly 60–68°F (15–20°C) on warm sunny days, with the warmest pockets near shallow shorelines. By early fall (September) surface values usually fall back into the 50–60°F (10–15°C) range, and beneath the surface the water remains markedly colder year-round. In winter the lake commonly reaches freezing and may ice over, with water temperatures at or below 32°F (0°C) under ice.
Swimming in and around Ashley Lake is possible in the warmer months but is limited by cold water and access considerations. Where public shorelines or campgrounds provide entry, people do swim during July and August when surface temperatures are most tolerable, yet even then hypothermia and cold-water shock are real hazards because of the lake’s depth and mountain inflows. There are typically no lifeguards, and some shoreline parcels may be private or managed, so visitors should confirm local access rules, enter slowly to gauge temperature, and limit time in the water for safety.