July is one of the warmer months of the year in New Haven, with average highs near 28.3°C and lows around 17.2°C (mean 22.8°C). It is about average for rainfall, averaging 110 mm of rainfall and 74% relative humidity across the period.
July is one of the warmer months of the year in New Haven. Across 45 years of records, the warmest Julys in New Haven were 1999, 2020 and 2025 — when the month averaged 25.1°C — while the coldest was 2000 at 19.9°C. Typical July days reach 28.3°C with nights near 17.2°C. The long-term trend is warming, about 0.6°C per decade.
July is about average for rainfall in New Haven, averaging 110 mm of rainfall. The wettest July on record was 2023 with 249 mm, while the driest was 2001 at 45 mm.
Relative humidity in New Haven during July averages 74%. The most humid July was 1984 at 85%, and the least humid was 1999 at 61%.
July receives about 5.9 kWh/m²/day of solar energy in New Haven. The sunniest Julys were 2018, 2019 and 2022 at 6.5 kWh/m²/day, and the cloudiest was 2021 at 5.
Average wind speed in New Haven during July is 0.1 m/s. The windiest Julys were 2023, 2024 and 2025, among others at 0.1 m/s, while the calmest were 2023, 2024 and 2025, among others at 0.1 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 21.8°C | 22.6°C | 22.2°C | 23.7°C | 24.1°C | +2.3°C |
| Avg High | 27.4°C | 28.4°C | 27.7°C | 29.1°C | 29.4°C | +2°C |
| Avg Low | 16.3°C | 16.8°C | 16.7°C | 18.2°C | 18.8°C | +2.5°C |
| Avg Rain | 118 mm | 94 mm | 107 mm | 101 mm | 145 mm | +28 mm |
July temperatures in New Haven have risen by about 2.5°C between 1981–1985 and 2021–2025.
July has ranged from a record low of 7.3°C (1988) to a record high of 38.4°C (2010).
Rainfall in July is about average for rainfall, averaging 110 mm, with a wettest year of 249 mm.
One of the best times to visit New Haven
July is one of the best times to visit New Haven. Expect days averaging 28.3°C and nights around 17.2°C (mean 22.8°C) — warmer than New Haven's yearly average — with higher rainfall (110 mm), so conditions are generally comfortable for sightseeing and outdoor plans.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 30.9°C | 25.1°C | 19.2°C | 38.3°C | 13.4°C | 108 mm | 73% | 0.1 m/s | 6 |
| 2024 | 28.9°C | 24.0°C | 19.1°C | 32.8°C | 14.4°C | 135 mm | 79% | 0.1 m/s | 5.7 |
| 2023 🌧️ | 28.5°C | 23.7°C | 18.9°C | 32.9°C | 13.2°C | 249 mm | 83% | 0.1 m/s | 5.8 |
| 2022 | 30.7°C | 24.7°C | 18.7°C | 36.6°C | 14.2°C | 64 mm | 66% | 0.1 m/s | 6.5 |
| 2021 | 26.8°C | 22.1°C | 17.5°C | 30.8°C | 11.1°C | 220 mm | 83% | 0.1 m/s | 5 |
| 2020 | 30.7°C | 25.1°C | 19.5°C | 35.9°C | 16.0°C | 97 mm | 73% | 0.1 m/s | 6.1 |
| 2019 | 29.7°C | 24.4°C | 19.0°C | 33.7°C | 15.2°C | 106 mm | 76% | 0.1 m/s | 6.5 |
| 2018 | 29.2°C | 23.8°C | 18.3°C | 34.8°C | 12.9°C | 151 mm | 76% | 0.1 m/s | 6.5 |
| 2017 | 27.5°C | 22.3°C | 17.0°C | 33.2°C | 12.3°C | 92 mm | 76% | 0.1 m/s | 5.7 |
| 2016 | 30.7°C | 24.5°C | 18.2°C | 35.4°C | 13.6°C | 95 mm | 67% | 0.1 m/s | 6.3 |
| 2015 | 28.9°C | 23.1°C | 17.4°C | 34.5°C | 13.5°C | 74 mm | 72% | 0.1 m/s | 6 |
| 2014 | 26.9°C | 22.0°C | 17.0°C | 30.3°C | 12.3°C | 132 mm | 77% | 0.1 m/s | 6.1 |
| 2013 | 28.1°C | 23.8°C | 19.5°C | 32.6°C | 14.3°C | 92 mm | 82% | 0.1 m/s | 5.7 |
| 2012 | 30.5°C | 24.6°C | 18.7°C | 35.8°C | 14.5°C | 106 mm | 69% | 0.1 m/s | 6 |
| 2011 | 28.3°C | 23.2°C | 18.1°C | 34.6°C | 12.6°C | 69 mm | 77% | 0.1 m/s | 6.3 |
| 2010 | 31.0°C | 24.9°C | 18.8°C | 38.4°C | 11.8°C | 91 mm | 67% | 0.1 m/s | 6.2 |
| 2009 | 25.0°C | 20.2°C | 15.5°C | 31.6°C | 10.5°C | 198 mm | 82% | 0.1 m/s | 5.7 |
| 2008 | 28.9°C | 23.5°C | 18.0°C | 34.2°C | 14.3°C | 131 mm | 75% | 0.1 m/s | 6 |
| 2007 | 27.7°C | 22.2°C | 16.7°C | 34.4°C | 10.1°C | 126 mm | 74% | 0.1 m/s | 6 |
| 2006 | 27.9°C | 23.1°C | 18.3°C | 32.3°C | 14.0°C | 82 mm | 83% | 0.1 m/s | 5.8 |
| 2005 | 29.3°C | 23.4°C | 17.5°C | 35.2°C | 13.1°C | 101 mm | 74% | 0.1 m/s | 5.7 |
| 2004 | 27.7°C | 22.3°C | 16.9°C | 32.1°C | 14.3°C | 121 mm | 76% | 0.1 m/s | 5.4 |
| 2003 | 27.0°C | 22.0°C | 16.9°C | 29.8°C | 13.3°C | 68 mm | 80% | 0.1 m/s | 5.8 |
| 2002 | 30.9°C | 24.3°C | 17.6°C | 37.1°C | 12.0°C | 48 mm | 62% | 0.1 m/s | 6.4 |
| 2001 | 27.6°C | 21.1°C | 14.5°C | 35.9°C | 9.3°C | 45 mm | 65% | 0.1 m/s | 6.4 |
| 2000 ❄️ | 25.0°C | 19.9°C | 14.7°C | 28.2°C | 11.1°C | 154 mm | 78% | 0.1 m/s | 5.5 |
| 1999 🔥 | 31.9°C | 25.1°C | 18.3°C | 37.4°C | 12.4°C | 45 mm | 61% | 0.1 m/s | 6.2 |
| 1998 | 26.8°C | 21.4°C | 16.0°C | 31.1°C | 12.4°C | 47 mm | 77% | 0.1 m/s | 6.1 |
| 1997 | 28.8°C | 22.3°C | 15.8°C | 35.5°C | 10.9°C | 105 mm | 67% | 0.1 m/s | 6.3 |
| 1996 | 25.2°C | 20.4°C | 15.7°C | 30.8°C | 11.9°C | 194 mm | 81% | 0.1 m/s | 5.5 |
| 1995 | 30.2°C | 24.0°C | 17.8°C | 36.5°C | 11.0°C | 86 mm | 69% | 0.1 m/s | 5.7 |
| 1994 | 29.1°C | 23.9°C | 18.6°C | 32.1°C | 13.3°C | 109 mm | 76% | 0.1 m/s | 5.9 |
| 1993 | 30.1°C | 23.7°C | 17.3°C | 35.8°C | 13.8°C | 57 mm | 64% | 0.1 m/s | 6.1 |
| 1992 | 25.7°C | 20.3°C | 15.0°C | 30.6°C | 10.0°C | 140 mm | 79% | 0.1 m/s | 6.1 |
| 1991 | 29.6°C | 23.2°C | 16.8°C | 37.1°C | 11.9°C | 83 mm | 64% | 0.1 m/s | 5.6 |
| 1990 | 26.9°C | 21.8°C | 16.7°C | 31.6°C | 11.5°C | 74 mm | 78% | 0.1 m/s | 5.6 |
| 1989 | 25.8°C | 20.8°C | 15.8°C | 32.2°C | 12.6°C | 109 mm | 83% | 0.1 m/s | 5.6 |
| 1988 | 30.0°C | 24.0°C | 17.9°C | 36.3°C | 7.3°C | 181 mm | 73% | 0.1 m/s | 5.4 |
| 1987 | 29.1°C | 23.1°C | 17.2°C | 34.4°C | 12.1°C | 59 mm | 73% | 0.1 m/s | 5.6 |
| 1986 | 27.3°C | 21.6°C | 16.0°C | 32.7°C | 9.0°C | 154 mm | 75% | 0.1 m/s | 5.7 |
| 1985 | 28.0°C | 21.9°C | 15.8°C | 32.1°C | 10.0°C | 149 mm | 71% | 0.1 m/s | 6.4 |
| 1984 | 24.7°C | 20.2°C | 15.6°C | 30.2°C | 10.8°C | 170 mm | 85% | 0.1 m/s | 5.8 |
| 1983 | 26.9°C | 21.5°C | 16.1°C | 30.8°C | 10.1°C | 55 mm | 78% | 0.1 m/s | — |
| 1982 | 26.3°C | 20.8°C | 15.3°C | 31.0°C | 7.8°C | 75 mm | 78% | 0.1 m/s | — |
| 1981 | 28.8°C | 22.7°C | 16.6°C | 33.8°C | 11.8°C | 106 mm | 69% | 0.1 m/s | — |
Actual recorded July data for each year, 1981–2025 — sourced from NASA POWER.
The average high in July is around 28.3°C with lows near 17.2°C (mean 22.8°C), based on 45 years of NASA POWER data.
July averages 110 mm of rainfall in New Haven, about average for rainfall. The wettest on record was 249 mm in 2023.
The hottest July reached 38.4°C in 2010. The coldest dipped to 7.3°C in 1988.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average July temperatures have risen by about 2.5°C. Daytime highs moved from 26.9°C to 29.2°C and overnight lows from 15.9°C to 18.7°C over the same span.
July is one of the warmer months of the year in New Haven and about average for rainfall, so plan for around 28.3°C daytime highs and 17.2°C at night.
Not quite — July is the 12th coolest month in New Haven, averaging 22.8°C.
For July in New Haven, pack light layers you can adjust through the day, with typical highs of 28.3°C and lows of 17.2°C. Bring an umbrella or light rain jacket too.
Relative humidity in July averages 74% — moderately humid.
Average wind speed in July is 0.1 m/s. The windiest July on record averaged 0.1 m/s (1981).
The wettest July on record was 2023 with 249 mm. On average, July sees 110 mm.
All figures are derived from NASA POWER (Prediction Of Worldwide Energy Resources), based on MERRA-2 satellite reanalysis, covering 1981–2025.
Explore how the weather in New Haven behaves each July, based on 45 years of NASA POWER climate data from 1981 to 2025. This page breaks down average temperatures, rainfall, humidity, wind and solar radiation for July specifically, along with year-by-year records and how the month has changed over the decades.
