Ada County, ID Weather Forecast
County weather hub
Mostly Sunny
Compare major city weather across Ada County, scan the latest forecast snapshots, and jump into local 7-day outlook pages from one hub.
Mostly sunny, with a high near 65.
County Weather Overview
This county weather page brings together forecast coverage for Ada County so visitors can compare temperatures, wind, and conditions across the region without hopping between unrelated pages.
Current forecast coverage spans 6 of 6 mapped cities in Ada County.
Page Snapshot
- Page focus
- county weather
- Forecast window
- May 26 to May 29, 2026
- Latest sync
- May 23, 2026 2:23 PM MDT
- Forecast office
- BOI
- Source
- NOAA / NWS
Daily Outlook
This Week in Ada County
Friday looks like the warmest upcoming period in Ada County at 75 degrees F.
Tuesday Night is the coolest period ahead with temperatures near 42 degrees F.
The strongest winds are forecast for Tuesday at about 16 to 21 mph NW.
Precipitation is mentioned in 5 upcoming forecast periods.
Forecast Details
- Last updated
- May 23, 2026 2:23 PM MDT
- Coverage
- 5 days
- Time zone
- America/Boise
- Forecast office
- BOI
- Radar station
- KCBX
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
A slight chance of rain showers. Partly cloudy, with a low around 42. Chance of precipitation is 20%.
Partly sunny, with a high near 67.
A slight chance of rain showers. Partly cloudy, with a low around 44. Chance of precipitation is 20%.
A slight chance of rain showers. Mostly sunny, with a high near 73. Chance of precipitation is 20%.
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 47. Chance of precipitation is 20%.
A slight chance of rain showers. Mostly sunny, with a high near 75. Chance of precipitation is 20%.
Partly cloudy, with a low around 48.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Tuesday
May 26
|
Mostly Sunny
|
65°F |
16 to 21 mph
NW
|
|
Tuesday Night
May 26
|
Slight Chance Rain Showers
|
42°F |
16 to 21 mph
NW
|
|
Wednesday
May 27
|
Partly Sunny
|
67°F |
12 to 16 mph
NW
|
|
Wednesday Night
May 27
|
Slight Chance Rain Showers
|
44°F |
7 to 15 mph
NW
|
|
Thursday
May 28
|
Slight Chance Rain Showers
|
73°F |
6 to 10 mph
NW
|
|
Thursday Night
May 28
|
Slight Chance Showers And Thunderstorms
|
47°F |
5 to 10 mph
NNW
|
|
Friday
May 29
|
Slight Chance Rain Showers
|
75°F |
5 to 10 mph
WSW
|
|
Friday Night
May 29
|
Partly Cloudy
|
48°F |
5 to 9 mph
NW
|
Major City Forecasts
Live forecast snapshots for major cities across Ada County.
Coverage
Forecast coverage currently spans 6 of 6 mapped cities in Ada County.
Largest mapped city population in this region: 228,959.
