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Quincy weather

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Quincy weather alerts and warnings

active National Weather Service watches, warnings and advisories

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Quincy weather in numbers

measured normals and 10 years of recorded weather

Quincy swings 64°F across the year, from 85°F highs in July to 21°F lows in January, and May is usually the wettest month in a year that brings about 40 in of precipitation. Over 10 years of recorded weather it averages 130 days a year at 77°F or above, 53 of them at 86°F or above, 91 frost nights, and rain on 108 days.

Warmest month
July
85°F average high
Coldest month
January
21°F average low
Wettest month
May
40 in a year
Comfortable
3 months
April, September and October
Residents
41,000
share this forecast
Most accurate here
European
94/100 CheckWeather Score
Warm days
130 days
a year at 77°F or above
Frost nights
91 nights
a year below 32°F
Rain days
108 days
a year with 0.04 in or more

Day counts are from the ERA5 reanalysis for Quincy’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

NWS, American, European side by side around Quincy and nearby towns.Live rain radar →
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Quincy 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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Quincy 10-day forecast, out to 14 days

where the models agree, and where they split

Quincy, Illinois (IL) is at its warmest in Jul (average highs near 85°F) and coldest in Jan (lows around 21°F), with roughly 40 in of precipitation across the year. Below, compare what NWS, American, European forecast for Quincy right now, and see exactly where they disagree.

We grade every model against the weather that actually happened, so you can see which forecast model is most accurate in United States before you trust any single number.

Quincy climate by month

average daytime high and overnight low across a typical year (1991-2020)
Jan
35°
21°
Feb
43°
22°
Mar
51°
33°
Apr
64°
43°
May
74°
54°
Jun
82°
63°
Jul
85°
67°
Aug
83°
67°
Sep
76°
57°
Oct
65°
47°
Nov
50°
35°
Dec
40°
27°

Source: 1991-2020 averages, ERA5 for this place adjusted with NASA POWER.

How Quincy's weather has changed since 1995

30 years of daily data, 1995-2024, shown as change
+1.3°F

Around Quincy, the difference between 1995-2004 and 2015-2024 is +1.3°F, within the normal swing from year to year.

1995: −2.2°F vs the 30-year average1996: −2.6°F vs the 30-year average1997: −1.3°F vs the 30-year average1998: +1.4°F vs the 30-year average1999: +0.7°F vs the 30-year average2000: +0.1°F vs the 30-year average2001: +0.3°F vs the 30-year average2002: −0.1°F vs the 30-year average2003: −0.8°F vs the 30-year average2004: −0.2°F vs the 30-year average2005: +1.4°F vs the 30-year average2006: +1.6°F vs the 30-year average2007: +1.0°F vs the 30-year average2008: −2.8°F vs the 30-year average2009: −2.2°F vs the 30-year average2010: −0.8°F vs the 30-year average2011: −0.1°F vs the 30-year average2012: +3.7°F vs the 30-year average2013: −1.7°F vs the 30-year average2014: −3.1°F vs the 30-year average2015: +0.1°F vs the 30-year average2016: +1.6°F vs the 30-year average2017: +2.1°F vs the 30-year average2018: +0.1°F vs the 30-year average2019: −1.3°F vs the 30-year average2020: −0.2°F vs the 30-year average2021: +0.3°F vs the 30-year average2022: −0.4°F vs the 30-year average2023: +2.8°F vs the 30-year average2024: +2.8°F vs the 30-year average
1995each stripe is one year2024
cooler than averagearound averagewarmer than average

Days above 95°F

3 fewer days a year

2015-2024 against 1995-2004. Within the normal year-to-year swing

1995: −9 vs the 30-year average1996: −7 vs the 30-year average1997: +3 vs the 30-year average1998: −5 vs the 30-year average1999: +13 vs the 30-year average2000: +3 vs the 30-year average2001: +4 vs the 30-year average2002: +2 vs the 30-year average2003: +9 vs the 30-year average2004: −8 vs the 30-year average2005: +21 vs the 30-year average2006: +7 vs the 30-year average2007: +3 vs the 30-year average2008: −9 vs the 30-year average2009: −9 vs the 30-year average2010: −9 vs the 30-year average2011: −2 vs the 30-year average2012: +32 vs the 30-year average2013: +2 vs the 30-year average2014: −9 vs the 30-year average2015: −9 vs the 30-year average2016: −7 vs the 30-year average2017: −1 vs the 30-year average2018: +12 vs the 30-year average2019: −9 vs the 30-year average2020: −7 vs the 30-year average2021: −9 vs the 30-year average2022: −2 vs the 30-year average2023: +12 vs the 30-year average2024: +3 vs the 30-year average

Frost nights

7 fewer nights a year

2015-2024 against 1995-2004, below 32°F. Within the normal year-to-year swing

1995: +9 vs the 30-year average1996: +18 vs the 30-year average1997: +11 vs the 30-year average1998: −21 vs the 30-year average1999: −3 vs the 30-year average2000: +5 vs the 30-year average2001: −2 vs the 30-year average2002: +10 vs the 30-year average2003: −2 vs the 30-year average2004: −8 vs the 30-year average2005: −6 vs the 30-year average2006: −7 vs the 30-year average2007: +11 vs the 30-year average2008: +13 vs the 30-year average2009: −5 vs the 30-year average2010: −3 vs the 30-year average2011: −3 vs the 30-year average2012: −13 vs the 30-year average2013: +20 vs the 30-year average2014: +15 vs the 30-year average2015: −16 vs the 30-year average2016: −11 vs the 30-year average2017: −16 vs the 30-year average2018: +25 vs the 30-year average2019: +13 vs the 30-year average2020: +0 vs the 30-year average2021: −9 vs the 30-year average2022: +5 vs the 30-year average2023: −19 vs the 30-year average2024: −23 vs the 30-year average

Average wind

−1%

2015-2024 against 1995-2004. Within the normal year-to-year swing

1995: −3% vs the 30-year average1996: +4% vs the 30-year average1997: −0% vs the 30-year average1998: −3% vs the 30-year average1999: +2% vs the 30-year average2000: +2% vs the 30-year average2001: −0% vs the 30-year average2002: −0% vs the 30-year average2003: −0% vs the 30-year average2004: +2% vs the 30-year average2005: −5% vs the 30-year average2006: +4% vs the 30-year average2007: +2% vs the 30-year average2008: +4% vs the 30-year average2009: −0% vs the 30-year average2010: −5% vs the 30-year average2011: −0% vs the 30-year average2012: +2% vs the 30-year average2013: +2% vs the 30-year average2014: +2% vs the 30-year average2015: −0% vs the 30-year average2016: −3% vs the 30-year average2017: +2% vs the 30-year average2018: −3% vs the 30-year average2019: −0% vs the 30-year average2020: −3% vs the 30-year average2021: −0% vs the 30-year average2022: +4% vs the 30-year average2023: −5% vs the 30-year average2024: −0% vs the 30-year average

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
YearTemp vs averageDays >95°F vs avgFrost nights vs avgWind vs avg
1995−2.2°F−9+9−3%
1996−2.6°F−7+18+4%
1997−1.3°F+3+11−0%
1998+1.4°F−5−21−3%
1999+0.7°F+13−3+2%
2000+0.1°F+3+5+2%
2001+0.3°F+4−2−0%
2002−0.1°F+2+10−0%
2003−0.8°F+9−2−0%
2004−0.2°F−8−8+2%
2005+1.4°F+21−6−5%
2006+1.6°F+7−7+4%
2007+1.0°F+3+11+2%
2008−2.8°F−9+13+4%
2009−2.2°F−9−5−0%
2010−0.8°F−9−3−5%
2011−0.1°F−2−3−0%
2012+3.7°F+32−13+2%
2013−1.7°F+2+20+2%
2014−3.1°F−9+15+2%
2015+0.1°F−9−16−0%
2016+1.6°F−7−11−3%
2017+2.1°F−1−16+2%
2018+0.1°F+12+25−3%
2019−1.3°F−9+13−0%
2020−0.2°F−7+0−3%
2021+0.3°F−9−9−0%
2022−0.4°F−2+5+4%
2023+2.8°F+12−19−5%
2024+2.8°F+3−23−0%

Source: NASA POWER daily data from the MERRA-2 reanalysis, 1995-2024. Each value describes a grid square of about 50 km around Quincy, 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 Quincy?

CheckWeather Score, graded against the weather that actually happened
ProviderCheckWeather-scoreTempWindRainRun by
European logo
European ★ Best
94
/100rank #1
96±0.4°F97±0.9 mph8994% hitECMWF - European Centre for Medium-Range Weather ForecastsReading, United Kingdom
American logo
American
74
/100rank #2
73±2.7°F96±1.3 mph5877% hitNOAA / NCEP (United States)College Park, Maryland, USA

The CheckWeather Score blends temperature, wind and rain accuracy, each measured against ERA5 (the recorded weather) over the last 30 days across 1999 cities. Lower error means a higher score. See which forecast model is most accurate in United States, how we measure forecast accuracy, or which model each weather app uses.

What do you think of the forecasts?

your vote counts

The accuracy above is the measured record. This is your opinion: which forecast service do you trust most in United States? Give each 1 to 5 stars.

NWSNational Blend (NBM)
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AmericanNOAA GFS
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EuropeanECMWF
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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.

Common questions

What's the weather in Quincy today?
On this page we show what NWS, American, European each forecast for Quincy today, side by side and updated live. When all three agree the forecast is reliable; when they split, we flag it so you know the day is genuinely less certain.
Will it rain in Quincy today or tomorrow?
Check the hourly strip and 7-day forecast above. We compare rain from NWS, American, European for Quincy and flag the days where the models disagree on whether showers actually arrive, which is exactly when a single app can catch you out.
Which forecast is most accurate for Quincy?
Over the last 30 days, the European model has been the most accurate for Quincy (CheckWeather Score 94/100), ahead of the American at 74. We grade every model against the recorded weather. See the US accuracy scoreboard for the full method.
What is the warmest month in Quincy?
July is typically the warmest month in Quincy, with average highs around 85°F.
How cold does Quincy get?
The coldest month in Quincy is January, when overnight lows average about 21°F.
How much rain does Quincy get?
Quincy sees roughly 40 in of precipitation a year, with May usually the wettest month.
Is Quincy getting warmer?
Not clearly. In NASA's reanalysis for the area around Quincy, the difference between 1995-2004 and 2015-2024 is 1.3°F, within the normal swing from year to year.

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More US weather

Which forecast is most accurate in United States?US rain radarNWS vs American vs European: models comparedHow we measure forecast accuracyHow accurate is a 7-day forecast?Illinois weather todayAll US citiesHoliday weather abroadEmbed Quincy on your siteThe national forecast models, explained: NBM, UKMO, GEM and ACCESS