Env. Canada, the European and the American model agree on a high near 14° in Greater Sudbury today. Tomorrow: light drizzle, around 16°, with a 39% chance of rain.
Greater Sudbury swings 40°C across the year, from 24°C highs in July to -16°C lows in February, and September is usually the wettest month in a year that brings about 908 mm of precipitation. Over 10 years of recorded weather it averages 47 days a year at 25°C or above, 5 of them at 30°C or above, 169 frost nights, and rain on 134 days.
Warmest month
July
24°C average high
Coldest month
February
-16°C average low
Wettest month
September
908 mm a year
Comfortable
4 months
May, June, July and August
Residents
166,000
share this forecast
Most accurate here
European
99/100 CheckWeather Score
Warm days
47 days
a year at 25°C or above
Frost nights
169 nights
a year below 0°C
Rain days
134 days
a year with 1 mm or more
Day counts are from the ERA5 reanalysis for Greater Sudbury’s grid square, 2016 to 2025, counted the same way for every city so the numbers compare. A reanalysis square is an area, not a weather station, so it is good for counting days and not for a single day’s record.
The weather map: all three models at once
Env. Canada, European, American side by side around Greater Sudbury and nearby towns.Live rain radar →
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Greater Sudbury hourly forecast: next 14 hours
consensus of the three models
Rain in the next 24 hours, model by model
each model's own hourly precipitation, side by side
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Greater Sudbury 10-day forecast, out to 14 days
where the models agree, and where they split
Today
Cloudy
14°1°
models agree
Tomorrow
Light drizzle
16°5°
±3°
Mon
Partly cloudy
12°1°
±2°
Tue
Cloudy
5°-3°
models agree
Wed
Cloudy
11°2°
±3°
Thu
Cloudy
15°6°
±5°
Fri
Cloudy
12°4°
models agree
Sat
Showers
15°5°
±5°
Sun
Light rain
14°9°
±3°
Mon
Light rain
13°5°
models agree
Tue
Light drizzle
7°0°
±3°
Wed
Light snow
5°0°
models agree
Thu
Cloudy
7°1°
models agree
Fri
Cloudy
7°0°
±3°
Greater Sudbury, Ontario (often shortened to Sudbury) is at its warmest in Jul (average highs near 24°C) and coldest in Feb (lows around -16°C), with roughly 908 mm of precipitation across the year. Below, compare what Env. Canada, European, American forecast for Greater Sudbury right now, and see exactly where they disagree.
average daytime high and overnight low across a typical year (1991-2020)
Jan
-8°
-15°
Feb
-6°
-16°
Mar
0°
-10°
Apr
9°
-2°
May
18°
5°
Jun
22°
11°
Jul
24°
14°
Aug
24°
14°
Sep
20°
9°
Oct
11°
4°
Nov
3°
-3°
Dec
-4°
-10°
Source: 1991-2020 averages, ERA5 for this place adjusted with NASA POWER.
How Greater Sudbury's weather has changed since 1995
30 years of daily data, 1995-2024, shown as change
+0.9°C
Around Greater Sudbury, the difference between 1995-2004 and 2015-2024 is +0.9°C, within the normal swing from year to year.
1995each stripe is one year2024
cooler than averagearound averagewarmer than average
Days above 25°C
10 more days a year
2015-2024 against 1995-2004. Within the normal year-to-year swing
Frost nights
6 fewer nights a year
2015-2024 against 1995-2004, below 0°C. Within the normal year-to-year swing
Average wind
−2%
2015-2024 against 1995-2004. Within the normal year-to-year swing
Bars: each year against the area's 30-year average. Dashed lines: the average of the first and the last ten years.
See the numbers year by year
Year
Temp vs average
Days >25°C vs avg
Frost nights vs avg
Wind vs avg
1995
−0.7°C
+9
+3
+3%
1996
−1.4°C
−9
+18
−1%
1997
−1.4°C
−12
+12
−1%
1998
+1.7°C
+16
−12
−1%
1999
+0.8°C
+11
−3
+3%
2000
−0.8°C
−22
+0
−1%
2001
+0.4°C
−8
−7
−1%
2002
−0.4°C
−2
+26
+3%
2003
−1.2°C
−11
+1
−1%
2004
−1.2°C
−21
−6
+3%
2005
+0.7°C
+28
+3
−1%
2006
+0.8°C
−0
−3
−5%
2007
+0.4°C
+11
−9
+3%
2008
−0.7°C
−24
−2
+3%
2009
−1.1°C
−26
+9
−5%
2010
+1.1°C
+13
−9
+3%
2011
+0.5°C
+11
−6
+3%
2012
+1.5°C
+22
−11
+3%
2013
−0.5°C
−4
+6
+3%
2014
−2.0°C
−27
+8
−1%
2015
−0.4°C
−15
−8
−1%
2016
+0.8°C
+16
+0
−1%
2017
−0.1°C
−22
+2
−1%
2018
−0.2°C
+23
+15
−1%
2019
−1.4°C
−15
+4
−1%
2020
+0.4°C
+11
+12
−1%
2021
+1.7°C
+10
−18
−1%
2022
+0.3°C
+13
−4
+3%
2023
+1.4°C
+10
−11
−5%
2024
+2.3°C
+18
−20
−1%
Source: NASA POWER daily data from the MERRA-2 reanalysis, 1995-2024. Each value describes a grid square of about 50 km around Greater Sudbury, not a weather station, and a square that takes in sea or a large lake runs milder than the city itself. That is why this section shows change against the square's own 30-year average rather than counts you could compare with a local station. Rain and snow are left out because their long-term record in this dataset is not consistent over time. "Within the normal year-to-year swing" means the change is smaller than the usual differences between single years.
Which forecast is most accurate in Greater Sudbury?
CheckWeather Score, graded against the weather that actually happened
Provider
CheckWeather-score
Temp
Wind
Rain
Run by
European ★ Best
99
/100rank #1
98±0.1°C
99±0.7 km/h
100100% hit
ECMWF - European Centre for Medium-Range Weather ForecastsReading, United Kingdom
EC
Env. Canada
86
/100rank #2
89±0.6°C
97±1.6 km/h
7687% hit
Environment and Climate Change CanadaDorval, Québec, Canada
American
84
/100rank #3
82±1.0°C
97±1.7 km/h
7687% hit
NOAA / NCEP (United States)College Park, Maryland, USA
The accuracy above is the measured record. This is your opinion: which forecast service do you trust most in Canada? Give each 1 to 5 stars.
Env. CanadaGEM model
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EuropeanECMWF
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AmericanNOAA GFS
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One vote per service. Anonymous: we store no personal data, only a one-way hash of your connection for a day to stop double votes.
Where the models disagree
temperature and rain, judged separately
Day
Temperature
Rain
Today
±2°14° to 15°
models agree0% to 0% chance
Tomorrow
±3°15° to 17°
±39%0% to 39% chance
Mon
±2°11° to 13°
±33%0% to 33% chance
Tue
±2°5° to 7°
models agree0% to 0% chance
Wed
±3°10° to 13°
±27%10% to 37% chance
The models often agree on temperature and still split on rain, and rain is usually what decides whether a plan survives. A wide rain range means the shower is genuinely uncertain, not that the forecast is wrong.
Sunrise and sunset in Greater Sudbury
today, local time
Sunrise
07:54
Sunset
18:21
Daylight
10h 27m
Common questions
What's the weather in Greater Sudbury today?
Saturday, October 24: Env. Canada, the European and the American model agree on a high near 14° in Greater Sudbury today. Tomorrow: light drizzle, around 16°, with a 39% chance of rain. The forecast on this page refreshes live.
Will it rain in Greater Sudbury today or tomorrow?
The models split on rain in Greater Sudbury on Sunday, October 25: Env. Canada 0%, European 39%, American 23%. When they disagree like this, treat any single app's answer with caution. On Saturday, October 24 the highest chance of rain from any model is 0%. The hourly strip and the model-by-model rain panel above update live.
Which forecast is most accurate for Greater Sudbury?
Over the last 30 days, the European model has been the most accurate for Greater Sudbury (CheckWeather Score 99/100), ahead of the Env. Canada at 86. We grade every model against the recorded weather. See the CA accuracy scoreboard for the full method.
What is the warmest month in Greater Sudbury?
July is typically the warmest month in Greater Sudbury, with average highs around 24°C.
How cold does Greater Sudbury get?
The coldest month in Greater Sudbury is February, when overnight lows average about -16°C.
How much rain does Greater Sudbury get?
Greater Sudbury sees roughly 908 mm of precipitation a year, with September usually the wettest month.
Is Greater Sudbury getting warmer?
Not clearly. In NASA's reanalysis for the area around Greater Sudbury, the difference between 1995-2004 and 2015-2024 is 0.9°C, within the normal swing from year to year.
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