Ajax Lake Weather Forecast
- 40
- 59
Chance Thunderstorms
- 39
- 61
Rain
- 31
- 45
Rain Showers
- 36
- 54
Mostly Sunny
- 40
- 61
Partly Sunny
- 42
- 62
Partly Sunny
Today 5 Sep Northwest Beaverhead County
Mostly cloudy early in the morning then becoming mostly sunny. Areas of fog in the morning. Chance of rain Showers early in the morning. Slight chance of Thunderstorms early in the Afternoon, then chance of Thunderstorms late in the afternoon. Highs 60 to 70. South Winds up to 10 Mph. Gusts up to 25 Mph in the afternoon. Chance of precipitation 50 percent.
Tonight 5 Sep Northwest Beaverhead County
Partly cloudy. Slight chance of Thunderstorms in the Evening, then slight chance of rain Showers after midnight. Areas of fog after midnight. Lows 35 to 45. Southwest Winds up to 10 Mph shifting to the east after midnight. Chance of precipitation 20 percent.
Ajax Lake Temperature Statistics
September Temperature
Salmon, Lemhi County Airport (16.2 miles)
Lowest 1 September, 2026
46 °FAverage September
59.9 °FHighest 1 September, 2026
82 °F
Climate (2021–2026)
Salmon, Lemhi County Airport (16.2 miles)
Average Low 2021–2026
33.1 °FAverage 2021–2026
46.1 °FAverage High 2021–2026
59.2 °F