Ada County (Boise)
January
Weather in Ada County for January 2026
Your guide to Ada County weather in January - trends and predictions
The climate of Ada County in January is quite snowy, averaging 14 snowy days.
In general, the average temperature in Ada County at the beginning of January is 2.6 °F. As the month progressed, temperatures tended to moderately rise, reaching an average of 3.1 °F by the end of January.
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Snow Forecast ❄️
Temperatures
More
10
Dry days
7
Rainy days
14
Snow days
1°/-4°
Temperatures
13 km/h
Avg max wind
88 %
Avg humidity
Ada County Weather January
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| Sun. | Mon. | Tue. | Wed. | Thu. | Fri. | Sat. |
|---|---|---|---|---|---|---|
| 1  2° | 2 5° | 3  4° | ||||
| 4 3° | 5  3° | 6 1° | 7  -0° | 8  -1° | 9 0° | 10  0° |
| 11 0° | 12 -0° | 13 -3° | 14  -3° | 15  -2° | 16 -4° | 17 0° |
| 18  1° | 19 1° | 20 -1° | 21  2° | 22 3° | 23 2° | 24  2° |
| 25 1° | 26 1° | 27  1° | 28 2° | 29  4° | 30 7° | 31 6° |
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Temperatures trend during January in Ada County
See the weather trend as well as the moving average line
January weather day by day
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| Date | Weather | Temperatures | Rain | Snow | More |
|---|---|---|---|---|---|
| Jan. 1 | Sunny | 2° /-2° | 15.6 mm | 10.4 cm | |
| Jan. 2 | Sunny | 5° /-1° | 5.6 mm | 1.7 cm | |
| Jan. 3 | Overcast | 4° /0° | 6.9 mm | 0 cm | |
| Jan. 4 | Overcast | 3° /-1° | 11.5 mm | 1.4 cm | |
| Jan. 5 | Heavy snow | 3° /-1° | 2.8 mm | 0.6 cm | |
| Jan. 6 | Heavy snow | 1° /-3° | 3.2 mm | 2.7 cm | |
| Jan. 7 | Partly cloudy | 0° /-6° | 0 mm | 0 cm | |
| Jan. 8 | Moderate snow | -1° /-5° | 1.6 mm | 1.3 cm | |
| Jan. 9 | Heavy snow | 0° /-3° | 5.8 mm | 4.7 cm | |
| Jan. 10 | Moderate or heavy snow showers | 0° /-7° | 3.4 mm | 2.8 cm | |
| Jan. 11 | Moderate snow | 0° /-6° | 0.6 mm | 0.4 cm | |
| Jan. 12 | Heavy snow | 0° /-5° | 5.8 mm | 3.5 cm | |
| Jan. 13 | Heavy snow | -3° /-9° | 7.7 mm | 6.6 cm | |
| Jan. 14 | Light snow | -3° /-10° | 2 mm | 1.6 cm | |
| Jan. 15 | Mist | -2° /-9° | 0 mm | 0 cm | |
| Jan. 16 | Mist | -4° /-11° | 0 mm | 0 cm | |
| Jan. 17 | Heavy snow | 0° /-8° | 7.2 mm | 6.2 cm | |
| Jan. 18 | Light freezing rain | 1° /-4° | 1.3 mm | 0 cm | |
| Jan. 19 | Moderate snow | 1° /-4° | 0.6 mm | 0 cm | |
| Jan. 20 | Heavy snow | -1° /-5° | 1.6 mm | 1.3 cm | |
| Jan. 21 | Light sleet | 2° /-6° | 3.1 mm | 0 cm | |
| Jan. 22 | Fog | 3° /-3° | 1.8 mm | 0 cm | |
| Jan. 23 | Light snow | 2° /-4° | 1.6 mm | 0 cm | |
| Jan. 24 | Freezing fog | 2° /-3° | 0.1 mm | 0.1 cm | |
| Jan. 25 | Heavy snow | 1° /-6° | 2.8 mm | 0.9 cm | |
| Jan. 26 | Mist | 1° /-10° | 0 mm | 0 cm | |
| Jan. 27 | Light drizzle | 1° /-6° | 2.4 mm | 0 cm | |
| Jan. 28 | Light drizzle | 2° /-5° | 0.6 mm | 0 cm | |
| Jan. 29 | Patchy rain possible | 4° /-5° | 0 mm | 0 cm | |
| Jan. 30 | Sunny | 7° /-3° | 0 mm | 0 cm | |
| Jan. 31 | Sunny | 6° /-1° | 5.8 mm | 3.5 cm | |
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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.
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 108.4 mm is expected in Ada County during January, occurring over more than 7 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 65.64 cm during January, occurring over 14 days.
What are the typical wind conditions in Ada County during January?
The average wind speed in Ada County during January is 13 km/h, suggesting breezy to windy conditions, depending on your activities.
Ada County snow forecast January 2026
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January rainfall patterns in Ada County
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