Weather on August 18
New Haven, CT
55 Years of Data
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.
| 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° | — | — |
New Haven, CT Temperature Range by Month
Average monthly highs and lows. The shaded band shows the typical daily temperature range.
New Haven, CT Monthly Precipitation
Average rainfall and snowfall per month, in inches.
New Haven, CT Daily Temperature Calendar
Average daily high temperature for every day of the year. Each cell is the climatological mean for that calendar day across 55 years of NOAA data.
Best Time to Visit New Haven, CT
New Haven, CT has no months that meet our "pleasant" threshold — every season has tradeoffs.