Challis, ID Weather

Custer County6:46 PM MDT44.50°N, 114.23°WElevation 5,253 ft

Current conditions

Mostly Clear
63°
Mostly Clear
Feels like 63°
High 64° Wednesday·Low 37° tonight
WindE 1 mph
Humidity33%
Dew point33°
Visibility10 mi
Cloud cover18%
UV index0 Low
Sunrise7:59 AM
Sunset6:46 PM

Forecast for this hour (no station report in the last two hours)

Forecast

10-day

  • Tonight

    Mostly clear. Low around 37, with temperatures rising to around 40 overnight. Southwest wind around 1 mph.

  • Wednesday

    A slight chance of rain between 9am and 4pm. Mostly sunny, with a high near 64. East southeast wind 0 to 3 mph. Chance of precipitation is 20%.

  • Wednesday Night

    Partly cloudy, with a low around 40. South southeast wind around 2 mph.

National Weather Service forecast updated 13 hrs ago.

Hourly

Hourly forecast
  1. Now Mostly Clear 63°
  2. 7 PM Mostly Clear 59°
  3. 8 PM Partly Cloudy 57°
  4. 9 PM Mostly Clear 53°
  5. 10 PM Mostly Clear 52°
  6. 11 PM Mostly Clear 50°
  7. Wed12 AM Mostly Clear 48°
  8. 1 AM Mostly Clear 46°
  9. 2 AM Partly Cloudy 45°
  10. 3 AM Mostly Clear 44°
  11. 4 AM Partly Cloudy 42°
  12. 5 AM Partly Cloudy 40°
  13. 6 AM Partly Sunny 39°
  14. 7 AM Partly Sunny 39°
  15. 8 AM Partly Sunny 37°
  16. 9 AM Slight Chance Light Rain 40°19%
  17. 10 AM Slight Chance Light Rain 45°15%
  18. 11 AM Mostly Sunny 49°
  19. 12 PM Sunny 53°
  20. 1 PM Sunny 56°
  21. 2 PM Sunny 60°
  22. 3 PM Slight Chance Light Rain 62°19%
  23. 4 PM Mostly Sunny 63°
  24. 5 PM Mostly Sunny 64°

10-day forecast

Details
  1. TodayOct 20 Sunny Sunny37°65°
  2. WedOct 21 Slight Chance Light Rain Slight Chance Light Rain19%40°64°
  3. ThuOct 22 Chance Light Rain then Chance Showers And Thunderstorms Chance Light Rain then Chance Showers And Thunderstorms91%39°64°
  4. FriOct 23 Light Rain Light Rain89%25°49°
  5. SatOct 24 Mostly Sunny Mostly Sunny28°51°
  6. SunOct 25 Mostly Sunny Mostly Sunny13%31°55°
  7. MonOct 26 Mostly Sunny Mostly Sunny18%31°56°
  8. TueOct 27 Sunny Sunny37°56°
  9. WedOct 28 Partly cloudy Partly cloudy37°54°
  10. ThuOct 29 Cloudy Cloudy38°54°

Days after the National Weather Service's seven are MET Norway's outlook, a computer model with no forecaster's review.

Radar

Full map
Open the National Weather Service radar (the map here needs JavaScript).

Weather news in Idaho

More weather news

Air quality

11
Good
Fine particles (PM2.5)

Air quality is satisfactory, and air pollution poses little or no risk.

Forecast

  • TueGood (31)
  • WedGood (33)
  • ThuGood (30)

Salmon, ID reporting area · 1 hr ago. Data from AirNow (EPA and its state, local and tribal partners); preliminary and subject to change.

Sun & moon

Sunrise 7:59 AM
Sunset 6:46 PM
Daylight 10 h 46 min (−2 min 57 s tomorrow)
Waxing Gibbous · 73% lit
Moonrise 4:16 PM Moonset 1:47 AM
Full moon Oct 26 New moon Nov 9

Almanac

Monthly
Normal high / low56° / 30°
Record high79° (2003)
Record low22° (1998)
Wettest0.03 in (2017)
Month to date0.34 in (normal 0.37 in)

Challis Airport, records since 1998. Normals 1991–2020. Data from NOAA's Regional Climate Centers (ACIS).

Forecasters' discussion

From the National Weather Service office in PIH, issued 17 hrs ago

Key Messages

- Very warm through Thursday with isolated showers and thunderstorms Today and Wednesday.

- Wet conditions Thursday and Friday and turning much colder Friday.

- Drying this weekend.

Discussion

Issued at 129 AM MDT Tue Oct 20 2026

Forecast hasn't changed significantly with regards to the next system. The low pressure system will stall off the coast of central California today and stay there into Wednesday. The low will begin to move inland on Thursday and then weaken and pass over eastern Idaho Friday. The low will depart the region by Saturday. Expect isolated showers and storms Today through Wednesday with very little rainfall expected. Rain chances increase on Thursday with rain likely overspreading the region Thursday night into Friday. The rain should come to an end by Saturday morning. Rainfall amounts are still quite uncertain and dependent upon rain intensity and the exact track of the low through the region. The mean qpf from the NBM continues to show 1.00 to 1.50 inches across East Idaho with 0.50 to 1.00 over the Magic Valley into the central mountains. The 10th percentile still supports 0.50 to 1.00 inches for East Idaho with 0.10 to 0.50 inches for the Magic Valley and central mountains. However the 90th percentile paints 1.50 to 2.00 inches across the entire region. The forecast qpf from WPC favors the 25th percentile. Snow with this event will probably not be terribly impactful. Snow levels may fall to pass level as the precipitation is about to exit the region. Temperatures will continue to run above normal into Thursday. Looks like a 20 to 25 degree drop in temperatures between Thursday and Friday for highs.

Aviation

Issued at 129 AM MDT Tue Oct 20 2026

A few virga showers may encroach upon TAF sites today. However not expecting significant impacts. Winds should remain relatively light today.

Fire Weather

Issued at 129 AM MDT Tue Oct 20 2026

Isolated showers and thunderstorms are expected today and Wednesday. Rainfall amounts should be very light. Widespread wetting rains will arrive Thursday afternoon and Thursday night.

Forecasts, observations and alerts in the United States come from the National Weather Service (NOAA); radar from NOAA's Multi-Radar Multi-Sensor system; satellite imagery from NASA's Global Imagery Browse Services (GIBS) and NOAA's GOES satellites; the map from the U.S. Geological Survey's National Map; air quality from AirNow (EPA and its partners); hurricane information from the National Hurricane Center; climate normals and records from NOAA's Regional Climate Centers (ACIS). Forecasts outside the United States and the UV index: MET Norway (CC BY 4.0); observations outside the U.S.: airport reports via NOAA's Aviation Weather Center. Place names: GeoNames (CC BY 4.0). Data are copied on a schedule and may lag the sources; for warnings that affect your safety, follow your local National Weather Service office and emergency officials. Weather news is drawn from the 4Conservative index and reflects what the press published. Terms of use.