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Chalk Reservoir Weather Forecast
| TODAY | TONIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT |
 |  |  | |  |  |  | |  |  | | |
| Sunny | Increasing Clouds | Smoke | Increasing Clouds | Partly Sunny | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Chance of Showers | Patchy Fog | Patchy Fog | Increasing Clouds |
| Hi: 87°FHi: 31°C | Lo: 56°FLo: 13°C | Hi: 84°FHi: 29°C | Lo: 54°FLo: 12°C | Hi: 74°FHi: 23°C | Hi: 72°FHi: 22°C Lo: 51°FLo: 11°C | Hi: 72°FHi: 22°C Lo: 51°FLo: 11°C | Lo: 44°FLo: 7°C | Hi: 73°FHi: 23°C | Hi: 79°FHi: 26°C Lo: 46°FLo: 8°C | Hi: 79°FHi: 26°C Lo: 46°FLo: 8°C | Lo: 50°FLo: 10°C |
| POP: 30% | POP: 30% | POP: 20% | POP: 20% |
POP = Probability of Precipitation.
Weather Outlook Updated: 230 AM MDT Mon Aug 31 2026 
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Issued: 607 AM MDT Mon Aug 31 2026
Key Messages
- Warm Today and Tuesday.
- Chance of thunderstorms in S-central ID Mon, and Central ID Tue afternoons.
- A strong low pressure system expected later this week will bring cooler, windier, and wetter conditions.
Aviation
/12Z Monday through Tuesday/... Issued 603 AM MDT MON AUG 31 2026 VFR. Showers and thunderstorms developing south/east of KTWF late this afternoon/evening. Storms capable of outflows to 25-35 kt. Surface winds: light and variable. Winds aloft at 10kft MSL: W 5-15 kt.
KBOI...VF...