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Weather in Sarnia for December 2025

Your guide to Sarnia weather in December - trends and predictions

    Official Weather Alert ⚠️

  • Snow Squall Warning - See hour by hour.

    • Snow Forecast ❄️

  • Sarnia typically experiences moderate snowfall in December, with an average of 8 snowy days.
    According to Sarnia snow forecast for December 2025, 5 snowy days are expected in the next 2 weeks. The closest date with snow is Friday, 19 December.

    • Temperatures

  • Until now, December 2025 in Sarnia is cooler than usual, with temperatures averaging -0.5 °C, this is -2.6 °C below the typical seasonal average.

  • Expect cooler weather in the next days in Sarnia with the forecast suggesting a temperature of -1.3 °C, lower than the historical average.

  • In general, the average temperature in Sarnia at the beginning of December is 1.6 °C. As the month progressed, temperatures tended to slightly decrease, reaching an average of 1.4 °C by the end of December.

    • More

  • New! Chat with our AI weatherman - it’s amazing and free.

Average dry days
12
Dry days
Average rainy days
11
Rainy days
Average snowy days
8
Snow days
Average temperatures
3°/0°
Temperatures
Average wind speed
25 km/h
Avg max wind
Average humidity
82 %
Avg humidity

Sarnia Weather December

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

Temperatures trend during December in Sarnia

See the weather trend as well as the moving average line

December weather in Sarnia day by day

Click on a date for more information
November January
Date Weather Temperatures Rain Snow More
1 Dec. Moderate rain
Moderate rain
 1° /-3° 3.9 mm 0 cm
2 Dec. Light rain
Light rain
 3° /-1° 2.2 mm 0 cm
3 Dec. Moderate rain
Moderate rain
 2° /-2° 5.1 mm 0 cm
4 Dec. Overcast
Overcast
 1° /-4° 1.1 mm 0.3 cm
5 Dec. Overcast
Overcast
 1° /-4° 0.1 mm 0.1 cm
6 Dec. Overcast
Overcast
 0° /-3° 0 mm 0 cm
7 Dec. Patchy rain possible
Patchy rain possible
 3° /-2° 1.2 mm 0.9 cm
8 Dec. Patchy rain possible
Patchy rain possible
 2° /-2° 0 mm 0 cm
9 Dec. Light drizzle
Light drizzle
 6° /-1° 4.3 mm 0 cm
10 Dec. Moderate snow
Moderate snow
 4° /-1° 9 mm 2.4 cm
11 Dec. Light freezing rain
Light freezing rain
 1° /-3° 0.1 mm 0 cm
12 Dec. Partly cloudy
Partly cloudy
 1° /-5° 0 mm 0 cm
13 Dec. Partly cloudy
Partly cloudy
 -1° /-7° 0 mm 0 cm
14 Dec. Light freezing rain
Light freezing rain
 -7° /-14° 0.4 mm 0 cm
15 Dec. Overcast
Overcast
 -6° /-8° 0 mm 0 cm
16 Dec. Partly cloudy
Partly cloudy
 -3° /-8° 0 mm 0 cm
17 Dec. Patchy rain possible
Patchy rain possible
 3° /-4° 0.3 mm 0 cm
18 Dec. Patchy rain possible
Patchy rain possible
 7° /-4° 1.8 mm 0 cm
19 Dec. Light snow
Light snow
 -4° /-5° 0 mm 0 cm
20 Dec. Heavy snow
Heavy snow
 2° /-4° 10.2 mm 1.2 cm
21 Dec. Light snow
Light snow
 -1° /-4° 0.2 mm 0 cm
22 Dec. Partly cloudy
Partly cloudy
 1° /-6° 0 mm 0 cm
23 Dec. Patchy rain possible
Patchy rain possible
 8° /-5° 0.6 mm 0 cm
24 Dec. Cloudy
Cloudy
 -7° /-8° 0 mm 0 cm
25 Dec. Moderate or heavy snow showers
Moderate or heavy snow showers
 -4° /-7° 2.5 mm 1.8 cm
26 Dec. Moderate snow
Moderate snow
 -1° /-5° 1.3 mm 0.9 cm
27 Dec. Partly cloudy
Partly cloudy
 -6° /-8° 0 mm 0 cm
28 Dec. Patchy rain possible
Patchy rain possible
 8° /3° 0.1 mm 0 cm
29 Dec. Patchy rain possible
Patchy rain possible
 6° /4° 38.5 mm 0 cm
30 Dec. Sunny
Sunny
 4° /0° 7.4 mm 0 cm
31 Dec. Light snow
Light snow
 3° /0° 6.6 mm 0.1 cm
Next
Important Notice
Our weather forecast for Sarnia 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 Sarnia forecast closer to your planned date for the most up-to-date weather information.
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Sarnia in December - FAQ

What are the expected maximum and minimum temperatures in Sarnia during December?
Brace for cold days with temperatures not exceeding 3° and nights that are likely to be freezing. Winter clothing is essential for comfort and safety.
How much rainfall should be expected in Sarnia during December?
Significant rainfall exceeding 114.7 mm is expected in Sarnia during December, occurring over more than 11 days. Preparing for wet conditions is recommended in your planning.
Will it snow in Sarnia in December 2025?
Sarnia experiences an average snowfall of 12.84 cm during December, occurring over 8 days.
What are the typical wind conditions in Sarnia during December?
The average wind speed in Sarnia during December is 25 km/h, suggesting breezy to windy conditions, depending on your activities.

Sarnia snow forecast December 2025

Track daily snowfall levels and discover Sarnia’s snowy potential this December ❄️
On average, Sarnia sees 8 snowy days during December, with approximately 12.8 cm of total snowfall.

December rainfall patterns in Sarnia

Explore the daily rainfall trends and prepare for Sarnias December weather 💧
Typically, Sarnia has 11 rainy days in December with a total of 114.7 mm of rainfall.

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Get accurate weather forecasts for Sarnia, located at latitude 42.979 and longitude -82.404. Stay updated with localized weather information tailored for Sarnia.

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