Weather on August 18
New Haven, CT
55 Years of Data
Avg High
82°F
Avg Low
65°F
Warmest
1990
89°F avg
Coldest
1979
59°F avg
About This Date
August 18th in New Haven, CT typically brings warm summer weather, with average highs around 82°F and lows near 65°F. Over 52 years of records, the warmest August 18th was in 1990 (89°F average), while the coldest was 1979 (59°F) — a 30°F range across recorded history. Rain or other precipitation has occurred on about 35% of August 18th dates historically, with the wettest August 18th recording 3.63" of rain. The last decade has been 3.5°F warmer on this date compared to 20-30 years ago.
The last decade has been 3.5°F warmer on this date compared to 20-30 years ago.
Planning for August 18th in New Haven, CT? Stay hydrated and seek shade during peak afternoon hours. Consider bringing rain gear or an umbrella.
Warming Trend
0.5°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 78° | 61° | 69° | — | — |
| 2024 | 75° | 69° | 72° | 2.77" | — |
| 2023 | 83° | 70° | 76° | 1.8" | — |
| 2022 | 85° | 64° | 74° | 0.1" | — |
| 2021 | 84° | 70° | 77° | — | — |
| 2020 | 82° | 66° | 74° | 0.33" | — |
| 2019 | 88° | 72° | 80° | 0.05" | — |
| 2018 | 84° | 71° | 78° | 1.93" | — |
| 2017 | 81° | 72° | 76° | 1.5" | — |
| 2016 | 83° | 69° | 76° | — | — |
| 2015 | 87° | 70° | 78° | — | — |
| 2014 | 80° | 60° | 70° | — | — |
| 2013 | 76° | 62° | 69° | — | — |
| 2012 | 78° | 60° | 69° | 0.79" | — |
| 2011 | 80° | 71° | 76° | — | — |
| 2010 | 83° | 64° | 73° | — | — |
| 2009 | 89° | 71° | 80° | — | — |
| 2008 | 86° | 64° | 75° | — | — |
| 2007 | 73° | 57° | 65° | — | — |
| 2006 | 79° | 64° | 71° | — | — |
| 2005 | 77° | 61° | 69° | — | — |
| 2004 | 77° | 58° | 67° | — | — |
| 2003 | 78° | 63° | 70° | 0.03" | — |
| 2002 | 91° | 74° | 82° | — | — |
| 2001 | 84° | 60° | 72° | 0.03" | — |
| 2000 | 73° | 54° | 63° | 0.23" | — |
| 1999 | 86° | 69° | 78° | — | — |
| 1996 | 82° | 64° | 73° | — | — |
| 1995 | 89° | 67° | 78° | — | — |
| 1993 | 92° | 68° | 80° | — | — |
| 1992 | 76° | 54° | 65° | 3.63" | — |
| 1991 | 83° | 69° | 76° | — | — |
| 1990warmest | 98° | 80° | 89° | — | — |
| 1989 | 82° | 63° | 72° | — | — |
| 1988 | 85° | 70° | 77° | — | — |
| 1987 | 92° | 67° | 79° | — | — |
| 1986 | 83° | 69° | 76° | 1.91" | — |
| 1985 | 76° | 53° | 64° | — | — |
| 1984 | 83° | 59° | 71° | — | — |
| 1983 | 84° | 68° | 76° | 0.3" | — |
| 1982 | 77° | 62° | 70° | 0.38" | — |
| 1981 | 83° | 57° | 70° | — | — |
| 1980 | 87° | 61° | 74° | 0.25" | — |
| 1979coldest | 65° | 54° | 59° | 1.27" | — |
| 1978 | 89° | 63° | 76° | — | — |
| 1977 | 76° | 59° | 67° | — | — |
| 1976 | 81° | 60° | 70° | — | — |
| 1975 | 80° | 62° | 71° | — | — |
| 1974 | 82° | 64° | 73° | 2.29" | — |
| 1973 | 76° | 66° | 71° | — | — |
| 1972 | 75° | 67° | 71° | — | — |
| 1971 | 87° | 62° | 75° | — | — |
52 years of data from NEW HAVEN