August is one of the warmer months of the year in West Haven, with average highs near 27.9°C and lows around 16.5°C (mean 22.2°C). It is about average for rainfall, averaging 106 mm of rainfall and 73% relative humidity across the period.
August is one of the warmer months of the year in West Haven. Across 45 years of records, the warmest August in West Haven was 2022 — when the month averaged 25.2°C — while the coldest was 1992 at 19.8°C. Typical August days reach 27.9°C with nights near 16.5°C. The long-term trend is warming, about 0.4°C per decade.
August is about average for rainfall in West Haven, averaging 106 mm of rainfall. The wettest August on record was 2011 with 357 mm, while the driest was 1981 at 27 mm.
Relative humidity in West Haven during August averages 73%. The most humid August was 2018 at 83%, and the least humid was 1995 at 60%.
August receives about 5.3 kWh/m²/day of solar energy in West Haven. The sunniest Augusts were 1984, 2015 and 2016 at 5.9 kWh/m²/day, and the cloudiest was 2021 at 4.6.
Average wind speed in West Haven during August is 0.1 m/s. The windiest Augusts were 2013, 2014 and 2025, among others at 0.2 m/s, while the calmest were 2022, 2023 and 2024, 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 | 21.3°C | 21.8°C | 22.5°C | 22.6°C | 23.1°C | +1.8°C |
| Avg High | 27.1°C | 27.7°C | 28.0°C | 28.1°C | 28.6°C | +1.5°C |
| Avg Low | 15.5°C | 15.9°C | 17.0°C | 17.0°C | 17.5°C | +2°C |
| Avg Rain | 91 mm | 117 mm | 97 mm | 120 mm | 102 mm | +12 mm |
August temperatures in West Haven have risen by about 1.5°C between 1981–1985 and 2021–2025.
August has ranged from a record low of 5.8°C (1986) to a record high of 39.2°C (2001).
Rainfall in August is about average for rainfall, averaging 106 mm, with a wettest year of 357 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0.3°C per decade while lows rose 0.5°C per decade, narrowing the gap between day and night.
One of the best times to visit West Haven
August is one of the best times to visit West Haven. Expect days averaging 27.9°C and nights around 16.5°C (mean 22.2°C) — warmer than West Haven's yearly average — with higher rainfall (106 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 | 28.9°C | 22.3°C | 15.8°C | 34.8°C | 10.5°C | 49 mm | 64% | 0.2 m/s | 5.8 |
| 2024 | 27.1°C | 21.9°C | 16.7°C | 33.8°C | 10.7°C | 179 mm | 80% | 0.1 m/s | 4.9 |
| 2023 | 26.2°C | 21.3°C | 16.5°C | 29.0°C | 11.8°C | 123 mm | 80% | 0.1 m/s | 4.9 |
| 2022 🔥 | 31.1°C | 25.2°C | 19.2°C | 36.4°C | 14.6°C | 54 mm | 66% | 0.1 m/s | 5.5 |
| 2021 | 28.7°C | 23.7°C | 18.7°C | 35.0°C | 13.0°C | 131 mm | 78% | 0.1 m/s | 4.6 |
| 2020 | 29.7°C | 23.9°C | 18.1°C | 34.9°C | 11.7°C | 77 mm | 69% | 0.1 m/s | 5.3 |
| 2019 | 28.4°C | 22.8°C | 17.2°C | 32.7°C | 10.6°C | 95 mm | 73% | 0.1 m/s | 5.5 |
| 2018 | 28.1°C | 23.6°C | 19.0°C | 33.1°C | 13.1°C | 145 mm | 83% | 0.1 m/s | 5.2 |
| 2017 | 27.3°C | 21.7°C | 16.0°C | 33.1°C | 10.9°C | 74 mm | 73% | 0.1 m/s | 5.5 |
| 2016 | 30.0°C | 24.2°C | 18.4°C | 34.2°C | 12.0°C | 94 mm | 70% | 0.1 m/s | 5.9 |
| 2015 | 30.1°C | 23.8°C | 17.5°C | 33.9°C | 13.6°C | 53 mm | 67% | 0.1 m/s | 5.9 |
| 2014 | 27.5°C | 21.5°C | 15.6°C | 32.8°C | 11.4°C | 73 mm | 71% | 0.2 m/s | 5.4 |
| 2013 | 26.0°C | 20.8°C | 15.6°C | 31.1°C | 10.8°C | 100 mm | 77% | 0.2 m/s | 5.2 |
| 2012 | 28.4°C | 22.7°C | 17.0°C | 32.4°C | 11.6°C | 108 mm | 74% | 0.2 m/s | 5.6 |
| 2011 🌧️ | 26.6°C | 21.7°C | 16.8°C | 35.5°C | 11.2°C | 357 mm | 81% | 0.2 m/s | 5.2 |
| 2010 | 28.9°C | 23.0°C | 17.1°C | 33.8°C | 11.8°C | 104 mm | 70% | 0.1 m/s | 5.1 |
| 2009 | 26.9°C | 22.3°C | 17.7°C | 32.8°C | 12.2°C | 86 mm | 82% | 0.1 m/s | 5.2 |
| 2008 | 26.4°C | 20.7°C | 15.1°C | 29.8°C | 9.9°C | 104 mm | 76% | 0.2 m/s | 5.6 |
| 2007 | 28.6°C | 22.6°C | 16.6°C | 35.4°C | 11.0°C | 69 mm | 72% | 0.1 m/s | 5.3 |
| 2006 | 27.0°C | 21.8°C | 16.6°C | 34.1°C | 10.9°C | 156 mm | 75% | 0.1 m/s | 5.2 |
| 2005 | 31.0°C | 24.9°C | 18.8°C | 37.0°C | 13.6°C | 47 mm | 67% | 0.1 m/s | 5 |
| 2004 | 26.5°C | 21.5°C | 16.5°C | 31.1°C | 10.9°C | 139 mm | 80% | 0.1 m/s | 5 |
| 2003 | 27.2°C | 22.6°C | 18.0°C | 30.4°C | 11.2°C | 124 mm | 81% | 0.1 m/s | 5 |
| 2002 | 30.6°C | 24.1°C | 17.5°C | 36.5°C | 13.6°C | 84 mm | 63% | 0.1 m/s | 5.4 |
| 2001 | 30.6°C | 24.4°C | 18.2°C | 39.2°C | 13.0°C | 82 mm | 67% | 0.1 m/s | 5.2 |
| 2000 | 25.5°C | 20.4°C | 15.3°C | 29.4°C | 9.4°C | 83 mm | 80% | 0.1 m/s | 5 |
| 1999 | 28.5°C | 22.5°C | 16.4°C | 36.1°C | 11.9°C | 77 mm | 65% | 0.1 m/s | 5 |
| 1998 | 29.4°C | 23.1°C | 16.7°C | 32.7°C | 10.5°C | 65 mm | 69% | 0.1 m/s | 5.4 |
| 1997 | 26.8°C | 21.0°C | 15.3°C | 31.7°C | 12.0°C | 138 mm | 73% | 0.2 m/s | 5.1 |
| 1996 | 27.5°C | 21.6°C | 15.7°C | 31.8°C | 12.1°C | 52 mm | 75% | 0.2 m/s | 5.4 |
| 1995 | 30.3°C | 23.1°C | 15.9°C | 35.8°C | 9.8°C | 57 mm | 60% | 0.1 m/s | 5.7 |
| 1994 | 25.9°C | 20.4°C | 14.8°C | 30.7°C | 9.3°C | 168 mm | 78% | 0.1 m/s | 5.1 |
| 1993 | 29.4°C | 23.0°C | 16.7°C | 35.5°C | 11.8°C | 59 mm | 68% | 0.1 m/s | 5.3 |
| 1992 ❄️ | 25.3°C | 19.8°C | 14.3°C | 30.3°C | 8.6°C | 138 mm | 77% | 0.1 m/s | 5.1 |
| 1991 | 27.8°C | 22.2°C | 16.7°C | 32.3°C | 12.9°C | 201 mm | 74% | 0.1 m/s | 5.2 |
| 1990 | 26.5°C | 21.4°C | 16.4°C | 32.1°C | 12.0°C | 217 mm | 80% | 0.1 m/s | 4.7 |
| 1989 | 25.2°C | 20.4°C | 15.6°C | 29.9°C | 8.5°C | 160 mm | 80% | 0.1 m/s | 5.1 |
| 1988 | 29.2°C | 23.2°C | 17.3°C | 35.1°C | 8.4°C | 71 mm | 70% | 0.1 m/s | 5.4 |
| 1987 | 27.4°C | 21.1°C | 14.8°C | 33.6°C | 8.8°C | 117 mm | 69% | 0.2 m/s | 5.1 |
| 1986 | 25.3°C | 20.0°C | 14.7°C | 31.8°C | 5.8°C | 110 mm | 75% | 0.2 m/s | 5 |
| 1985 | 26.9°C | 21.0°C | 15.1°C | 33.3°C | 10.9°C | 114 mm | 72% | 0.1 m/s | 5.1 |
| 1984 | 26.4°C | 21.3°C | 16.3°C | 29.0°C | 9.3°C | 44 mm | 81% | 0.1 m/s | 5.9 |
| 1983 | 29.0°C | 22.6°C | 16.2°C | 33.8°C | 10.6°C | 88 mm | 71% | 0.1 m/s | — |
| 1982 | 25.8°C | 19.9°C | 13.9°C | 30.2°C | 6.1°C | 86 mm | 70% | 0.1 m/s | — |
| 1981 | 29.0°C | 22.1°C | 15.2°C | 32.8°C | 9.8°C | 27 mm | 63% | 0.1 m/s | — |
Actual recorded August data for each year, 1981–2025 — sourced from NASA POWER.
The average high in August is around 27.9°C with lows near 16.5°C (mean 22.2°C), based on 45 years of NASA POWER data.
August averages 106 mm of rainfall in West Haven, about average for rainfall. The wettest on record was 357 mm in 2011.
The hottest August reached 39.2°C in 2001. The coldest dipped to 5.8°C in 1986.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average August temperatures have risen by about 1.5°C. Daytime highs moved from 27.4°C to 28.4°C and overnight lows from 15.3°C to 17.4°C over the same span.
August is one of the warmer months of the year in West Haven and about average for rainfall, so plan for around 27.9°C daytime highs and 16.5°C at night.
Not quite — August is the 11th coolest month in West Haven, averaging 22.2°C.
For August in West Haven, pack light layers you can adjust through the day, with typical highs of 27.9°C and lows of 16.5°C. Bring an umbrella or light rain jacket too.
Relative humidity in August averages 73% — moderately humid.
Average wind speed in August is 0.1 m/s. The windiest August on record averaged 0.2 m/s (1986).
The wettest August on record was 2011 with 357 mm. On average, August sees 106 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 West Haven behaves each August, 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 August specifically, along with year-by-year records and how the month has changed over the decades.
