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United States weather

Weather in Ada County, Idaho for January 2026

Your guide to Ada County weather in January - trends and predictions

    Snow Forecast ❄️

  • Expect heavy snowfall in Ada County during January, with an average of 16 snowy days.
    According to Ada County snow forecast for January 2026, no snow is expected at the beginning of the month.

    • Temperatures

  • Expect cooler weather in the next days in Ada County with the forecast suggesting a temperature of 7.5 °F, lower than the historical average.

  • In general, the average temperature in Ada County at the beginning of January is 4.6 °F. As the month progressed, temperatures tended to moderately fall, reaching an average of 3.1 °F by the end of January.

    • More

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Average dry days
9
Dry days
Average rainy days
6
Rainy days
Average snowy days
16
Snow days
Average temperatures
1°/-5°
Temperatures
Average wind speed
12 km/h
Avg max wind
Average humidity
85 %
Avg humidity

Ada County Weather January

Move between months or click on a day
December
February
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1
Patchy rain possible
9°
2
Patchy rain possible
10°
3
Patchy rain possible
6°
4
Overcast
3°
5
Heavy snow
3°
6
Heavy snow
1°
7
Partly cloudy
-0°
8
Moderate snow
-1°
9
Heavy snow
0°
10
Moderate or heavy snow showers
0°
11
Moderate snow
0°
12
Heavy snow
-0°
13
Heavy snow
-3°
14
Light snow
-3°
15
Mist
-2°
16
Mist
-4°
17
Heavy snow
0°
18
Light freezing rain
1°
19
Moderate snow
1°
20
Heavy snow
-1°
21
Light sleet
2°
22
Fog
3°
23
Light snow
2°
24
Freezing fog
2°
25
Heavy snow
1°
26
Mist
1°
27
Light drizzle
1°
28
Light drizzle
2°
29
Patchy rain possible
4°
30
Sunny
7°
31
Sunny
6°

Temperatures trend during January in Ada County

See the weather trend as well as the moving average line

January weather in Ada County day by day

Click on a date for more information
December February
Date Weather Temperatures Rain Snow More
Jan. 1 Patchy rain possible
Patchy rain possible
 9° /5° 2.5 mm 0 cm
Jan. 2 Patchy rain possible
Patchy rain possible
 10° /4° 0.2 mm 0 cm
Jan. 3 Patchy rain possible
Patchy rain possible
 6° /1° 1.5 mm 0 cm
Jan. 4 Overcast
Overcast
 3° /-1° 11.5 mm 1.4 cm
Jan. 5 Heavy snow
Heavy snow
 3° /-1° 2.8 mm 0.6 cm
Jan. 6 Heavy snow
Heavy snow
 1° /-3° 3.2 mm 2.7 cm
Jan. 7 Partly cloudy
Partly cloudy
 0° /-6° 0 mm 0 cm
Jan. 8 Moderate snow
Moderate snow
 -1° /-5° 1.6 mm 1.3 cm
Jan. 9 Heavy snow
Heavy snow
 0° /-3° 5.8 mm 4.7 cm
Jan. 10 Moderate or heavy snow showers
Moderate or heavy snow showers
 0° /-7° 3.4 mm 2.8 cm
Jan. 11 Moderate snow
Moderate snow
 0° /-6° 0.6 mm 0.4 cm
Jan. 12 Heavy snow
Heavy snow
 0° /-5° 5.8 mm 3.5 cm
Jan. 13 Heavy snow
Heavy snow
 -3° /-9° 7.7 mm 6.6 cm
Jan. 14 Light snow
Light snow
 -3° /-10° 2 mm 1.6 cm
Jan. 15 Mist
Mist
 -2° /-9° 0 mm 0 cm
Jan. 16 Mist
Mist
 -4° /-11° 0 mm 0 cm
Jan. 17 Heavy snow
Heavy snow
 0° /-8° 7.2 mm 6.2 cm
Jan. 18 Light freezing rain
Light freezing rain
 1° /-4° 1.3 mm 0 cm
Jan. 19 Moderate snow
Moderate snow
 1° /-4° 0.6 mm 0 cm
Jan. 20 Heavy snow
Heavy snow
 -1° /-5° 1.6 mm 1.3 cm
Jan. 21 Light sleet
Light sleet
 2° /-6° 3.1 mm 0 cm
Jan. 22 Fog
Fog
 3° /-3° 1.8 mm 0 cm
Jan. 23 Light snow
Light snow
 2° /-4° 1.6 mm 0 cm
Jan. 24 Freezing fog
Freezing fog
 2° /-3° 0.1 mm 0.1 cm
Jan. 25 Heavy snow
Heavy snow
 1° /-6° 2.8 mm 0.9 cm
Jan. 26 Mist
Mist
 1° /-10° 0 mm 0 cm
Jan. 27 Light drizzle
Light drizzle
 1° /-6° 2.4 mm 0 cm
Jan. 28 Light drizzle
Light drizzle
 2° /-5° 0.6 mm 0 cm
Jan. 29 Patchy rain possible
Patchy rain possible
 4° /-5° 0 mm 0 cm
Jan. 30 Sunny
Sunny
 7° /-3° 0 mm 0 cm
Jan. 31 Sunny
Sunny
 6° /-1° 5.8 mm 3.5 cm
Next
Important Notice
Our weather forecast for Ada County in January is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Ada County forecast closer to your planned date for the most up-to-date weather information.
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Ada County in January - FAQ

What are the expected maximum and minimum temperatures in Ada County during January?
Brace for cold days with temperatures not exceeding 1° and nights that are likely to be freezing. Winter clothing is essential for comfort and safety.
How much rainfall should be expected in Ada County during January?
Significant rainfall exceeding 101.4 mm is expected in Ada County during January, occurring over more than 6 days. Preparing for wet conditions is recommended in your planning.
Will it snow in Ada County in January 2026?
Ada County experiences an average snowfall of 49.525 cm during January, occurring over 16 days.
What are the typical wind conditions in Ada County during January?
The average wind speed in Ada County during January is 12 km/h, suggesting breezy to windy conditions, depending on your activities.

Ada County snow forecast January 2026

Track daily snowfall levels and discover Ada County’s snowy potential this January ❄️
On average, Ada County sees 16 snowy days during January, with approximately 49.5 cm of total snowfall.

January rainfall patterns in Ada County

Explore the daily rainfall trends and prepare for Ada Countys January weather 💧
Typically, Ada County has 6 rainy days in January with a total of 101.4 mm of rainfall.
Top locations in Ada County
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Boise
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Location coordinates Where is Ada County?

Get accurate weather forecasts for Ada County, located at latitude 43.614 and longitude -116.203. Stay updated with localized weather information tailored for Ada County.

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