Mount Rainier (WA)
December
Weather in Mount Rainier, Washington for December 2026
Your guide to Mount Rainier weather in December - trends and predictions
With an average of 3 snowy days, Mount Rainier usually enjoys a light touch of snow in December.
In general, the average temperature in Mount Rainier at the beginning of December is 6.4 °F. As the month progressed, temperatures tended to remain steady, reaching an average of 6.4 °F by the end of December.
Mount Rainier in December brings notable rainfall, with an average of 18 rainy days and a total precipitation of 943.7 mm.
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Snow Forecast ❄️
Temperatures
Rain 🌧️
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10
Dry days
18
Rainy days
3
Snow days
8°/4°
Temperatures
14 km/h
Avg max wind
84 %
Avg humidity
Mount Rainier Weather December
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Temperatures trend during December in Mount Rainier
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December weather in Mount Rainier day by day
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| Date | Weather | Temperatures | Rain | Snow | More |
|---|---|---|---|---|---|
| Dec. 1 |  Overcast | 6° /2° | 0 mm | 0 cm | |
| Dec. 2 |  Fog | 5° /2° | 3.2 mm | 0 cm | |
| Dec. 3 | Overcast | 4° /1° | 0 mm | 0 cm | |
| Dec. 4 |  Heavy rain at times | 5° /0° | 39.2 mm | 0 cm | |
| Dec. 5 |  Moderate or heavy rain shower | 9° /5° | 74.7 mm | 0 cm | |
| Dec. 6 | Overcast | 7° /5° | 0 mm | 0 cm | |
| Dec. 7 | Heavy rain at times | 9° /4° | 16.1 mm | 0 cm | |
| Dec. 8 |  Heavy rain | 10° /7° | 171.6 mm | 0 cm | |
| Dec. 9 | Heavy rain | 10° /6° | 124 mm | 0 cm | |
| Dec. 10 | Heavy rain | 10° /8° | 230.2 mm | 0 cm | |
| Dec. 11 |  Moderate rain | 11° /7° | 52.4 mm | 0 cm | |
| Dec. 12 | Fog | 10° /8° | 0 mm | 0 cm | |
| Dec. 13 | Overcast | 14° /8° | 0 mm | 0 cm | |
| Dec. 14 | Moderate or heavy rain shower | 13° /9° | 7.4 mm | 0 cm | |
| Dec. 15 |  Moderate or heavy rain with thunder | 12° /6° | 25.3 mm | 0 cm | |
| Dec. 16 |  Light rain shower | 8° /5° | 17.6 mm | 0 cm | |
| Dec. 17 | Moderate or heavy rain shower | 7° /3° | 64.3 mm | 0 cm | |
| Dec. 18 | Moderate or heavy rain shower | 8° /3° | 47.1 mm | 0 cm | |
| Dec. 19 | Overcast | 4° /2° | 12.5 mm | 0 cm | |
| Dec. 20 | Overcast | 4° /0° | 2.5 mm | 1.8 cm | |
| Dec. 21 | Moderate or heavy rain shower | 6° /2° | 14.3 mm | 0 cm | |
| Dec. 22 | Overcast | 5° /1° | 8.4 mm | 0 cm | |
| Dec. 23 | Moderate rain at times | 6° /2° | 3.6 mm | 0 cm | |
| Dec. 24 | Overcast | 11° /2° | 0 mm | 0 cm | |
| Dec. 25 | Moderate or heavy rain shower | 7° /5° | 7.9 mm | 0 cm | |
| Dec. 26 |  Moderate snow | 5° /1° | 15.5 mm | 7 cm | |
| Dec. 27 | Overcast | 1° /0° | 5.9 mm | 4.3 cm | |
| Dec. 28 | Overcast | 4° /0° | 0 mm | 0 cm | |
| Dec. 29 |  Cloudy | 9° /3° | 0 mm | 0 cm | |
| Dec. 30 | Cloudy | 10° /6° | 0 mm | 0 cm | |
| Dec. 31 | Overcast | 9° /6° | 0 mm | 0 cm | |
| Next | |||||
Important Notice
Our weather forecast for Mount Rainier in December 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 Mount Rainier forecast closer to your planned date for the most up-to-date weather information.
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Mount Rainier in December - FAQ
What are the expected maximum and minimum temperatures in Mount Rainier during December?
Prepare for cooler days with highs just around 8° and colder nights, dipping below 4°.
How much rainfall should be expected in Mount Rainier during December?
Significant rainfall exceeding 943.7 mm is expected in Mount Rainier during December, occurring over more than 18 days. Preparing for wet conditions is recommended in your planning.
Will it snow in Mount Rainier in December 2026?
Mount Rainier experiences an average snowfall of 13.1 cm during December, occurring over 3 days.
What are the typical wind conditions in Mount Rainier during December?
The average wind speed in Mount Rainier during December is 14 km/h, suggesting breezy to windy conditions, depending on your activities.
Mount Rainier snow forecast December 2026
Track daily snowfall levels and discover Mount Rainier’s snowy potential this December ❄️
On average, Mount Rainier sees 3 snowy days during December, with approximately 13.1 cm of total snowfall.
December rainfall patterns in Mount Rainier
Explore the daily rainfall trends and prepare for Mount Rainiers December weather 💧
Typically, Mount Rainier has 18 rainy days in December with a total of 943.7 mm of rainfall.
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