Michael D Beckwith / CC BY 2.0
Joliet, IL Weather on August 27
August 27th in Joliet, IL typically brings warm summer weather, with average highs around 83°F and lows near 64°F. Over 53 years of records, the warmest August 27th was in 1973 (85°F average), while the coldest was 2015 (58°F) — a 27°F range across recorded history. Rain or other precipitation has occurred on about 32% of August 27th dates historically, with the wettest August 27th recording 2.2" of rain. Temperatures on this date have remained relatively stable over the past several decades.
What to Expect on August 27
Planning for August 27th in Joliet, IL? Stay hydrated and seek shade during peak afternoon hours. Consider bringing rain gear or an umbrella.
August 27 Weather Records for Joliet
- •The all-time record high for August 27th in Joliet, IL is 97°F, set in 1973.
- •The coldest August 27th on record dropped to 50°F in 2025.
- •Temperatures have reached 90°F or higher on August 27th in 8 of the last 53 years.
- •Last year (1971), August 27th was 8°F cooler than the long-term average.
Frequently Asked Questions
What was the warmest August 27 ever in Joliet?
The warmest August 27 in Joliet, IL reached 97°F in 1973. That is 14°F above the long-term average high of 83°F.
What was the coldest August 27 ever in Joliet?
The coldest August 27 in Joliet, IL dropped to 50°F in 2025. That is 14°F below the long-term average low of 64°F.
What is the average temperature on August 27 in Joliet?
On August 27, Joliet averages a high of 83°F and a low of 64°F based on 53 years of NOAA weather observations from JOLIET.
How many years of weather data are available for August 27 in Joliet?
We have 53 years of weather records for August 27 in Joliet, IL, sourced from NOAA's Global Historical Climatology Network. Records include daily high and low temperatures, precipitation, and snowfall data going back to 2025.
August 27 Weather History in Joliet
| Year | High | Low | Precip | Snow |
|---|---|---|---|---|
| 2025 | 77°F | 50°F | 0" | -- |
| 2024 | 93°F | 73°F | 0" | -- |
| 2023 | 85°F | 63°F | 0" | -- |
| 2022 | 79°F | 59°F | 0" | -- |
| 2021 | 86°F | 68°F | 0" | -- |
| 2020 | 90°F | 71°F | 0" | -- |
| 2019 | 75°F | 64°F | 0.4" | -- |
| 2018 | 92°F | 72°F | 0" | -- |
| 2017 | 74°F | 58°F | 0" | -- |
| 2016 | 83°F | 66°F | 0.85" | -- |
| 2015 | 65°F | 52°F | 0" | -- |
| 2014 | 82°F | 69°F | 0.55" | -- |
| 2013 | 89°F | 67°F | 0" | -- |
| 2012 | 75°F | 66°F | 1.95" | -- |
| 2011 | 82°F | 60°F | 0" | -- |
| 2010 | 78°F | 59°F | 0" | -- |
| 2009 | 72°F | 59°F | 0.92" | -- |
| 2008 | 78°F | 59°F | 0" | -- |
| 2007 | 78°F | 60°F | 0" | -- |
| 2006 | 77°F | 69°F | 0.08" | -- |
| 2005 | 83°F | 67°F | 0" | -- |
| 2004 | 82°F | 68°F | 1.1" | -- |
| 2003 | 92°F | 70°F | 0" | -- |
| 2002 | 85°F | 68°F | 0" | -- |
| 2001 | 84°F | 64°F | 0" | -- |
| 2000 | 80°F | 66°F | 0" | -- |
| 1999 | 82°F | 62°F | 0" | -- |
| 1998 | 86°F | 64°F | 0" | -- |
| 1997 | 81°F | 59°F | 0.07" | -- |
| 1996 | 84°F | 64°F | 0" | -- |
| 1995 | 89°F | 67°F | 0" | -- |
| 1994 | 83°F | 66°F | 0.05" | -- |
| 1993 | 92°F | 73°F | 0" | -- |
| 1992 | 77°F | 63°F | 0.6" | -- |
| 1991 | 91°F | 69°F | 0" | -- |
| 1990 | 87°F | 68°F | 0" | -- |
| 1989 | 79°F | 65°F | 0.03" | -- |
| 1988 | 79°F | 54°F | 0" | -- |
| 1986 | 88°F | 58°F | 2.2" | -- |
| 1985 | 73°F | 54°F | 0" | -- |
| 1984 | 87°F | 58°F | 0" | -- |
| 1983 | 89°F | 67°F | 0.36" | -- |
| 1982 | 75°F | 54°F | 0" | -- |
| 1981 | 82°F | 65°F | 1.8" | -- |
| 1980 | 89°F | 63°F | 0" | -- |
| 1979 | 78°F | 60°F | 0.29" | -- |
| 1978 | 82°F | 65°F | 0.34" | -- |
| 1977 | 85°F | 58°F | 0" | -- |
| 1976 | 86°F | 68°F | 0.14" | -- |
| 1974 | 93°F | 68°F | 0" | -- |
| 1973 | 97°F | 73°F | 0" | -- |
| 1972 | 76°F | 65°F | 0" | -- |
| 1971 | 75°F | 57°F | 0" | -- |
Based on 53 years of data from NOAA station: JOLIET
Monthly Climate Averages
Historical temperature and precipitation averages for Joliet, IL, based on 55+ years of weather data.
Temperatures in Fahrenheit. Precipitation and snowfall in inches.