August is one of the warmer months of the year in Chatham, with average highs near 26.2°C and lows around 17.3°C (mean 21.8°C). It is about average for rainfall, averaging 65 mm of rainfall and 72% relative humidity across the period.
August is one of the warmer months of the year in Chatham. Across 45 years of records, the warmest August in Chatham was 2021 — when the month averaged 25.2°C — while the coldest was 1986 at 18.2°C. Typical August days reach 26.2°C with nights near 17.3°C. The long-term trend is warming, about 0.8°C per decade.
August is about average for rainfall in Chatham, averaging 65 mm of rainfall. The wettest August on record was 1987 with 153 mm, while the driest was 2002 at 17 mm.
Relative humidity in Chatham during August averages 72%. The most humid August was 1984 at 80%, and the least humid was 2025 at 62%.
August receives about 5.3 kWh/m²/day of solar energy in Chatham. The sunniest Augusts were 2008 and 2019 at 5.8 kWh/m²/day, and the cloudiest was 1997 at 4.4.
Average wind speed in Chatham during August is 2.8 m/s. The windiest August was 1997 at 3.3 m/s, while the calmest were 1983 and 1996 at 2.3 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 20.0°C | 21.4°C | 22.1°C | 22.4°C | 23.3°C | +3.3°C |
| Avg High | 24.5°C | 26.1°C | 26.5°C | 26.5°C | 27.8°C | +3.3°C |
| Avg Low | 15.6°C | 16.7°C | 17.6°C | 18.3°C | 18.7°C | +3.1°C |
| Avg Rain | 97 mm | 53 mm | 54 mm | 69 mm | 50 mm | -47 mm |
August temperatures in Chatham have risen by about 3.5°C between 1981–1985 and 2021–2025.
August has ranged from a record low of 6.1°C (1986) to a record high of 34.4°C (2001).
Rainfall in August is about average for rainfall, averaging 65 mm, with a wettest year of 153 mm.
One of the best times to visit Chatham
August is one of the best times to visit Chatham. Expect days averaging 26.2°C and nights around 17.3°C (mean 21.8°C) — warmer than Chatham's yearly average — with moderate rainfall (65 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 | 27.6°C | 22.7°C | 17.9°C | 32.9°C | 11.2°C | 30 mm | 62% | 2.7 m/s | 5.5 |
| 2024 | 27.5°C | 22.9°C | 18.3°C | 32.9°C | 11.9°C | 65 mm | 69% | 2.8 m/s | 5.2 |
| 2023 | 26.0°C | 21.5°C | 16.9°C | 29.2°C | 11.0°C | 87 mm | 71% | 3 m/s | 5 |
| 2022 | 28.3°C | 23.7°C | 19.0°C | 32.4°C | 14.5°C | 40 mm | 66% | 2.9 m/s | 5.4 |
| 2021 🔥 | 29.6°C | 25.2°C | 20.7°C | 34.0°C | 15.1°C | 33 mm | 68% | 2.6 m/s | 5.5 |
| 2020 | 27.8°C | 23.5°C | 19.2°C | 32.1°C | 14.9°C | 43 mm | 69% | 3 m/s | 5.6 |
| 2019 | 26.3°C | 22.2°C | 18.1°C | 29.1°C | 12.9°C | 71 mm | 74% | 2.8 m/s | 5.8 |
| 2018 | 27.1°C | 23.5°C | 19.9°C | 30.3°C | 13.9°C | 89 mm | 78% | 2.8 m/s | 5.1 |
| 2017 | 24.9°C | 20.9°C | 16.8°C | 29.1°C | 11.4°C | 65 mm | 75% | 2.8 m/s | 5.2 |
| 2016 | 28.9°C | 24.8°C | 20.7°C | 33.1°C | 16.5°C | 44 mm | 72% | 2.9 m/s | 5.6 |
| 2015 | 25.4°C | 21.3°C | 17.3°C | 29.7°C | 13.0°C | 61 mm | 74% | 2.9 m/s | 5.4 |
| 2014 | 25.1°C | 21.1°C | 17.0°C | 28.6°C | 11.5°C | 89 mm | 77% | 2.7 m/s | 5.2 |
| 2013 | 25.3°C | 21.2°C | 17.0°C | 29.9°C | 12.5°C | 67 mm | 75% | 2.7 m/s | 5.2 |
| 2012 | 26.3°C | 22.2°C | 18.1°C | 31.6°C | 13.6°C | 104 mm | 70% | 2.5 m/s | 5.7 |
| 2011 | 27.0°C | 22.7°C | 18.3°C | 31.0°C | 14.7°C | 77 mm | 71% | 2.9 m/s | 5.5 |
| 2010 | 29.0°C | 24.5°C | 20.0°C | 32.6°C | 15.2°C | 25 mm | 67% | 2.9 m/s | 5.2 |
| 2009 | 25.9°C | 21.8°C | 17.7°C | 30.1°C | 12.0°C | 56 mm | 73% | 3.2 m/s | 5.2 |
| 2008 | 26.5°C | 21.8°C | 17.1°C | 29.7°C | 12.8°C | 32 mm | 68% | 3 m/s | 5.8 |
| 2007 | 27.1°C | 22.8°C | 18.5°C | 33.4°C | 12.8°C | 84 mm | 72% | 2.8 m/s | 5.1 |
| 2006 | 26.9°C | 22.7°C | 18.4°C | 32.5°C | 15.4°C | 48 mm | 69% | 2.9 m/s | 5.3 |
| 2005 | 28.8°C | 24.2°C | 19.7°C | 33.1°C | 14.5°C | 54 mm | 66% | 3 m/s | 5.2 |
| 2004 | 24.3°C | 20.2°C | 16.0°C | 28.4°C | 12.1°C | 67 mm | 75% | 3.1 m/s | 5.1 |
| 2003 | 27.1°C | 22.3°C | 17.6°C | 31.8°C | 12.8°C | 31 mm | 72% | 2.5 m/s | 5.4 |
| 2002 | 27.3°C | 22.4°C | 17.4°C | 31.4°C | 11.7°C | 17 mm | 67% | 3 m/s | 5.6 |
| 2001 | 26.9°C | 22.0°C | 17.2°C | 34.4°C | 13.5°C | 64 mm | 71% | 2.8 m/s | 5.3 |
| 2000 | 24.5°C | 20.7°C | 16.8°C | 28.1°C | 11.2°C | 87 mm | 78% | 2.9 m/s | 5.2 |
| 1999 | 25.2°C | 20.7°C | 16.2°C | 29.9°C | 12.0°C | 65 mm | 70% | 3 m/s | 5 |
| 1998 | 27.4°C | 23.1°C | 18.7°C | 30.8°C | 12.1°C | 88 mm | 70% | 2.6 m/s | 5.4 |
| 1997 | 24.9°C | 20.6°C | 16.3°C | 29.6°C | 13.4°C | 41 mm | 72% | 3.3 m/s | 4.4 |
| 1996 | 27.0°C | 21.8°C | 16.5°C | 30.7°C | 13.1°C | 20 mm | 69% | 2.3 m/s | 5.5 |
| 1995 | 29.0°C | 24.3°C | 19.6°C | 32.8°C | 15.3°C | 38 mm | 69% | 2.8 m/s | 5 |
| 1994 | 24.5°C | 19.9°C | 15.2°C | 28.9°C | 10.5°C | 53 mm | 72% | 2.9 m/s | 5.1 |
| 1993 | 27.3°C | 22.5°C | 17.8°C | 31.1°C | 12.4°C | 40 mm | 70% | 2.5 m/s | 5.2 |
| 1992 | 22.8°C | 18.3°C | 13.9°C | 28.1°C | 9.0°C | 71 mm | 77% | 3 m/s | 5.6 |
| 1991 | 27.0°C | 21.8°C | 16.6°C | 32.1°C | 11.2°C | 54 mm | 68% | 2.8 m/s | 5.4 |
| 1990 | 25.5°C | 21.1°C | 16.6°C | 29.3°C | 11.3°C | 61 mm | 74% | 2.6 m/s | 4.8 |
| 1989 | 24.9°C | 20.6°C | 16.2°C | 28.1°C | 10.1°C | 52 mm | 74% | 2.9 m/s | 5.3 |
| 1988 | 27.6°C | 23.0°C | 18.5°C | 34.1°C | 12.2°C | 84 mm | 70% | 3 m/s | 5.4 |
| 1987 🌧️ | 24.1°C | 20.0°C | 15.9°C | 28.7°C | 8.7°C | 153 mm | 76% | 3.1 m/s | 4.8 |
| 1986 ❄️ | 22.4°C | 18.2°C | 13.9°C | 27.4°C | 6.1°C | 79 mm | 77% | 2.7 m/s | 5.1 |
| 1985 | 23.0°C | 18.7°C | 14.3°C | 27.4°C | 9.8°C | 134 mm | 78% | 2.6 m/s | 5 |
| 1984 | 24.3°C | 19.8°C | 15.2°C | 28.1°C | 9.5°C | 116 mm | 80% | 2.4 m/s | 5.4 |
| 1983 | 25.4°C | 20.7°C | 15.9°C | 28.0°C | 10.4°C | 76 mm | 79% | 2.3 m/s | — |
| 1982 | 23.4°C | 18.6°C | 13.9°C | 28.3°C | 7.6°C | 72 mm | 73% | 2.6 m/s | — |
| 1981 | 25.0°C | 20.8°C | 16.6°C | 28.2°C | 10.3°C | 102 mm | 75% | 2.8 m/s | — |
Actual recorded August data for each year, 1981–2025 — sourced from NASA POWER.
The average high in August is around 26.2°C with lows near 17.3°C (mean 21.8°C), based on 45 years of NASA POWER data.
August averages 65 mm of rainfall in Chatham, about average for rainfall. The wettest on record was 153 mm in 1987.
The hottest August reached 34.4°C in 2001. The coldest dipped to 6.1°C in 1986.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average August temperatures have risen by about 3.5°C. Daytime highs moved from 24.2°C to 27.8°C and overnight lows from 15.2°C to 18.6°C over the same span.
August is one of the warmer months of the year in Chatham and about average for rainfall, so plan for around 26.2°C daytime highs and 17.3°C at night.
Not quite — August is the 11th coolest month in Chatham, averaging 21.8°C.
For August in Chatham, pack light layers you can adjust through the day, with typical highs of 26.2°C and lows of 17.3°C. Bring an umbrella or light rain jacket too.
Relative humidity in August averages 72% — moderately humid.
Average wind speed in August is 2.8 m/s. The windiest August on record averaged 3.3 m/s (1997).
The wettest August on record was 1987 with 153 mm. On average, August sees 65 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 Chatham 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.
