Weather WorldArrow Lake, MT 7-Day Weather Forecast
Quick Weather Clicks
Settings
Sun & Moon
Arrow Lake Weather Forecast
Arrow Lake, MT Weather Forecast Date: 1232 PM MDT Thu Sep 17 2026
Weather forecast for Arrow Lake, MT
Today Hi: 61°FHi: 16°C Lo: 46°F Lo: 8°C |
Rest of Today... Partly sunny. Chance of rain showers and slight chance of thunderstorms early in the afternoon, then chance of thunderstorms late in the afternoon. Near steady temperature in the lower 60s. South winds 10 to 15 mph with gusts to around 30 mph. Chance of precipitation 50%. |
| Fri Hi: 60°FHi: 16°C Lo: 44°F Lo: 7°C |
Friday... Partly sunny. Chance of rain showers and slight chance of thunderstorms in the morning, then chance of thunderstorms in the afternoon. Highs 54 to 64. South winds up to 10 mph. Chance of precipitation 50%. |
| Sat Hi: 51°FHi: 11°C Lo: 42°F Lo: 6°C |
Saturday... Rain showers and slight chance of thunderstorms in the morning, then rain showers and chance of thunderstorms in the afternoon. Highs 45 to 55. West winds up to 10 mph. Chance of precipitation near 100%. |
| Sun Hi: 61°FHi: 16°C Lo: 41°F Lo: 5°C |
Sunday... Warmer. Partly sunny. Slight chance of rain in the morning, then chance of rain showers and slight chance of thunderstorms in the afternoon. Highs 55 to 65. Chance of precipitation 50%. |
Mon Hi: 63°FHi: 17°C Lo: 43°F Lo: 6°C |
Monday... Mostly clear. Lows 37 to 43. Highs 57 to 67. |
Tue Hi: 64°FHi: 18°C Lo: 42°F Lo: 6°C |
Tuesday... Mostly sunny. A 20% chance of rain in the afternoon. Highs 58 to 68. |
| Wed Hi: 63°FHi: 17°C |
Wednesday... Sunny. Highs 57 to 67. |
Arrow Lake Radar Loop
Use the map search tool if you want to place a location marker on the radar map...