Arnprior swings 38°C across the year, from 24°C highs in July to -14°C lows in February, and September is usually the wettest month in a year that brings about 817 mm of precipitation.
Warmest month
July
24°C average high
Coldest month
February
-14°C average low
Wettest month
September
817 mm a year
Below freezing
6 months
January, February, March, April, November and December
Comfortable
4 months
May, June, July and August
Residents
8,795
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The weather map: all three models at once
Env. Canada, European, American side by side around Arnprior and nearby towns.Live rain radar →
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Arnprior 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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Arnprior 10-day forecast, out to 14 days
where the models agree, and where they split
Today
Clear
13°0°
models agree
Tomorrow
Cloudy
17°0°
models agree
Mon
Cloudy
13°4°
models agree
Tue
Mostly clear
7°0°
models agree
Wed
Cloudy
9°-1°
models agree
Thu
Drizzle
16°4°
models agree
Fri
Mostly clear
14°6°
±3°
Sat
Light drizzle
11°4°
±5°
Sun
Cloudy
15°5°
±4°
Mon
Heavy drizzle
14°7°
models agree
Tue
Cloudy
12°4°
±4°
Wed
Drizzle
6°1°
±3°
Thu
Drizzle
9°1°
models agree
Fri
Light drizzle
7°0°
±3°
Arnprior, Ontario is at its warmest in Jul (average highs near 24°C) and coldest in Feb (lows around -14°C), with roughly 817 mm of precipitation across the year. Below, compare what Env. Canada, European, American forecast for Arnprior right now, and see exactly where they disagree.
average daytime high and overnight low across a typical year (1991-2020)
Jan
-5°
-12°
Feb
-4°
-14°
Mar
2°
-7°
Apr
11°
-1°
May
19°
7°
Jun
23°
13°
Jul
24°
16°
Aug
24°
16°
Sep
21°
11°
Oct
13°
5°
Nov
5°
-1°
Dec
-2°
-8°
Source: 1991-2020 averages, ERA5 for this place adjusted with NASA POWER.
How Arnprior's weather has changed since 1995
30 years of daily data, 1995-2024, shown as change
+0.7°C
Around Arnprior, the difference between 1995-2004 and 2015-2024 is +0.7°C, within the normal swing from year to year.
1995each stripe is one year2024
cooler than averagearound averagewarmer than average
Days above 30°C
4 more days a year
2015-2024 against 1995-2004. Within the normal year-to-year swing
Frost nights
3 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 >30°C vs avg
Frost nights vs avg
Wind vs avg
1995
−0.7°C
+2
−0
+3%
1996
−0.9°C
−7
+15
−1%
1997
−1.2°C
+5
+10
+3%
1998
+1.3°C
−2
−11
−1%
1999
+0.6°C
+10
−3
+3%
2000
−1.1°C
−12
+4
+3%
2001
+0.4°C
+3
−6
−1%
2002
+0.2°C
+4
+15
+3%
2003
−1.0°C
−3
+10
−1%
2004
−1.1°C
−12
−3
−1%
2005
+0.5°C
+15
−3
−1%
2006
+0.6°C
−2
−7
−1%
2007
−0.4°C
−4
−4
−1%
2008
−0.5°C
−9
+1
−1%
2009
−0.9°C
−6
+3
−5%
2010
+0.8°C
+8
−7
−1%
2011
+0.4°C
−8
−9
−1%
2012
+1.3°C
+14
−6
−1%
2013
−0.4°C
−5
+5
−1%
2014
−1.0°C
−9
−1
+3%
2015
−0.2°C
+3
−2
+3%
2016
+0.5°C
+16
+5
+3%
2017
−0.1°C
−11
−1
−1%
2018
−0.2°C
+6
+16
−1%
2019
−1.1°C
−7
+4
−1%
2020
+0.3°C
+1
+12
−1%
2021
+1.2°C
+9
−16
−5%
2022
+0.3°C
+3
−3
+3%
2023
+1.2°C
+1
−2
−5%
2024
+2.0°C
+6
−14
−1%
Source: NASA POWER daily data from the MERRA-2 reanalysis, 1995-2024. Each value describes a grid square of about 50 km around Arnprior, 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 Arnprior?
CheckWeather Score, graded against the weather that actually happened
Provider
CheckWeather-score
Temp
Wind
Rain
Run by
European ★ Best
91
/100rank #1
95±0.3°C
97±1.4 km/h
8290% hit
ECMWF - European Centre for Medium-Range Weather ForecastsReading, United Kingdom
EC
Env. Canada
86
/100rank #2
84±0.9°C
93±3.5 km/h
8290% hit
Environment and Climate Change CanadaDorval, Québec, Canada
American
82
/100rank #3
80±1.1°C
94±2.8 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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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
±1°12° to 14°
models agree0% to 0% chance
Tomorrow
±1°17° to 18°
±3%0% to 3% chance
Mon
±2°12° to 14°
±49%6% to 55% chance
Tue
±1°6° to 7°
±1%0% to 1% chance
Wed
±1°8° to 9°
±4%0% to 4% 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 Arnprior
today, local time
Sunrise
07:33
Sunset
18:04
Daylight
10h 31m
Common questions
What's the weather in Arnprior today?
Saturday, October 24: Env. Canada, the European and the American model agree on a high near 13° in Arnprior today. Tomorrow: cloudy, around 17°, with a 3% chance of rain. The forecast on this page refreshes live.
Will it rain in Arnprior today or tomorrow?
Rain looks unlikely in Arnprior on Sunday, October 25: no model gives more than 3% (Env. Canada 0%, European 0%, American 3%). 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 Arnprior?
Over the last 30 days, the European model has been the most accurate for Arnprior (CheckWeather Score 91/100), 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 Arnprior?
July is typically the warmest month in Arnprior, with average highs around 24°C.
How cold does Arnprior get?
The coldest month in Arnprior is February, when overnight lows average about -14°C.
How much rain does Arnprior get?
Arnprior sees roughly 817 mm of precipitation a year, with September usually the wettest month.
Is Arnprior getting warmer?
Not clearly. In NASA's reanalysis for the area around Arnprior, the difference between 1995-2004 and 2015-2024 is 0.7°C, within the normal swing from year to year.
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