August is one of the warmer months of the year in Johnson City, with average highs near 29.6°C and lows around 17.6°C (mean 23.6°C). It is about average for rainfall, averaging 98 mm of rainfall and 70% relative humidity across the period.
August is one of the warmer months of the year in Johnson City. Across 45 years of records, the warmest August in Johnson City was 2007 — when the month averaged 26.9°C — while the coldest were 1989 and 2013 at 21.5°C. Typical August days reach 29.6°C with nights near 17.6°C. The long-term August temperature trend is broadly flat.
August is about average for rainfall in Johnson City, averaging 98 mm of rainfall. The wettest August on record was 2021 with 162 mm, while the driest was 2007 at 37 mm.
Relative humidity in Johnson City during August averages 70%. The most humid August was 2013 at 83%, and the least humid was 1999 at 56%.
August receives about 5.4 kWh/m²/day of solar energy in Johnson City. The sunniest August was 2024 at 6 kWh/m²/day, and the cloudiest were 1985 and 1992 at 4.6.
Average wind speed in Johnson City during August is 0.8 m/s. The windiest Augusts were 1995 and 1999 at 1 m/s, while the calmest were 2018, 2020 and 2022, among others at 0.7 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 23.4°C | 23.4°C | 23.9°C | 23.7°C | 23.7°C | +0.3°C |
| Avg High | 29.5°C | 29.6°C | 30.0°C | 29.5°C | 29.3°C | -0.2°C |
| Avg Low | 17.3°C | 17.2°C | 17.9°C | 17.8°C | 18.2°C | +0.9°C |
| Avg Rain | 97 mm | 89 mm | 93 mm | 101 mm | 122 mm | +25 mm |
August temperatures in Johnson City have risen by about 0.8°C between 1981–1985 and 2021–2025.
August has ranged from a record low of 5.3°C (1986) to a record high of 37.9°C (1983).
Rainfall in August is about average for rainfall, averaging 98 mm, with a wettest year of 162 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0°C per decade while lows rose 0.2°C per decade, narrowing the gap between day and night.
One of the best times to visit Johnson City
August is one of the best times to visit Johnson City. Expect days averaging 29.6°C and nights around 17.6°C (mean 23.6°C) — warmer than Johnson City's yearly average — with higher rainfall (98 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 | 29.1°C | 23.2°C | 17.2°C | 33.7°C | 11.0°C | 88 mm | 71% | 0.8 m/s | 5.5 |
| 2024 | 30.5°C | 24.1°C | 17.8°C | 35.2°C | 10.1°C | 82 mm | 68% | 0.8 m/s | 6 |
| 2023 | 28.8°C | 23.4°C | 18.1°C | 33.0°C | 12.1°C | 162 mm | 76% | 0.8 m/s | 5.2 |
| 2022 | 28.6°C | 23.5°C | 18.5°C | 32.8°C | 15.4°C | 109 mm | 78% | 0.7 m/s | 5.7 |
| 2021 🌧️ | 30.1°C | 24.6°C | 19.1°C | 33.7°C | 14.8°C | 162 mm | 72% | 0.8 m/s | 5.4 |
| 2020 | 28.8°C | 23.6°C | 18.5°C | 31.7°C | 16.5°C | 127 mm | 77% | 0.7 m/s | 5.3 |
| 2019 | 30.4°C | 24.4°C | 18.4°C | 34.6°C | 13.2°C | 72 mm | 69% | 0.8 m/s | 5.9 |
| 2018 | 29.4°C | 24.0°C | 18.5°C | 32.5°C | 11.0°C | 128 mm | 73% | 0.7 m/s | 5.3 |
| 2017 | 28.6°C | 22.9°C | 17.2°C | 32.8°C | 12.9°C | 113 mm | 71% | 0.8 m/s | 5.3 |
| 2016 | 31.2°C | 25.4°C | 19.5°C | 35.1°C | 13.4°C | 105 mm | 71% | 0.8 m/s | 5.6 |
| 2015 | 29.2°C | 23.1°C | 17.0°C | 32.3°C | 11.8°C | 88 mm | 69% | 0.7 m/s | 5.8 |
| 2014 | 28.9°C | 23.0°C | 17.1°C | 32.9°C | 12.2°C | 103 mm | 72% | 0.9 m/s | 5.4 |
| 2013 | 26.2°C | 21.5°C | 16.8°C | 29.6°C | 10.5°C | 105 mm | 83% | 0.8 m/s | 5.1 |
| 2012 | 29.1°C | 22.9°C | 16.6°C | 33.6°C | 12.9°C | 78 mm | 69% | 0.7 m/s | 5.6 |
| 2011 | 30.9°C | 24.4°C | 17.8°C | 34.1°C | 12.6°C | 70 mm | 66% | 0.9 m/s | 5.9 |
| 2010 | 30.9°C | 25.1°C | 19.4°C | 35.1°C | 15.3°C | 145 mm | 72% | 0.7 m/s | 5.5 |
| 2009 | 27.3°C | 22.2°C | 17.1°C | 30.4°C | 13.8°C | 101 mm | 79% | 0.8 m/s | 5.3 |
| 2008 | 29.9°C | 23.3°C | 16.7°C | 33.7°C | 11.4°C | 94 mm | 63% | 0.9 m/s | 5.8 |
| 2007 🔥 | 33.6°C | 26.9°C | 20.1°C | 37.2°C | 16.3°C | 37 mm | 59% | 0.8 m/s | 5.8 |
| 2006 | 31.7°C | 25.3°C | 18.8°C | 36.2°C | 14.1°C | 122 mm | 67% | 0.8 m/s | 5.3 |
| 2005 | 31.4°C | 25.3°C | 19.1°C | 34.8°C | 17.2°C | 85 mm | 67% | 0.8 m/s | 5.3 |
| 2004 | 28.5°C | 22.4°C | 16.2°C | 32.7°C | 9.5°C | 65 mm | 71% | 0.8 m/s | 5.3 |
| 2003 | 27.9°C | 23.1°C | 18.4°C | 30.9°C | 14.2°C | 145 mm | 81% | 0.7 m/s | 5.2 |
| 2002 | 31.9°C | 25.0°C | 18.0°C | 36.0°C | 12.5°C | 62 mm | 60% | 0.8 m/s | 5.7 |
| 2001 | 28.6°C | 23.1°C | 17.6°C | 30.9°C | 12.3°C | 117 mm | 74% | 0.8 m/s | 5.5 |
| 2000 | 28.8°C | 22.7°C | 16.5°C | 33.7°C | 12.3°C | 101 mm | 71% | 0.9 m/s | 5.3 |
| 1999 | 31.5°C | 24.0°C | 16.6°C | 34.9°C | 8.2°C | 53 mm | 56% | 1 m/s | 5.9 |
| 1998 | 29.9°C | 23.3°C | 16.7°C | 33.8°C | 11.3°C | 66 mm | 65% | 0.8 m/s | 5.9 |
| 1997 | 29.5°C | 22.9°C | 16.3°C | 33.5°C | 10.8°C | 48 mm | 64% | 0.9 m/s | 5.4 |
| 1996 | 28.6°C | 23.0°C | 17.3°C | 31.3°C | 14.2°C | 94 mm | 72% | 0.7 m/s | 5.6 |
| 1995 | 32.6°C | 26.1°C | 19.6°C | 37.8°C | 16.0°C | 71 mm | 64% | 1 m/s | 5.2 |
| 1994 | 27.5°C | 22.2°C | 16.8°C | 31.7°C | 12.4°C | 135 mm | 76% | 0.8 m/s | 5 |
| 1993 | 30.8°C | 24.5°C | 18.2°C | 34.8°C | 14.0°C | 103 mm | 66% | 0.7 m/s | 5 |
| 1992 | 27.4°C | 21.7°C | 16.0°C | 31.7°C | 10.5°C | 101 mm | 74% | 0.8 m/s | 4.6 |
| 1991 | 27.9°C | 22.5°C | 17.1°C | 31.6°C | 12.2°C | 96 mm | 75% | 0.7 m/s | 5.2 |
| 1990 | 30.0°C | 23.9°C | 17.7°C | 34.2°C | 14.0°C | 124 mm | 67% | 0.8 m/s | 5.1 |
| 1989 ❄️ | 26.6°C | 21.5°C | 16.5°C | 29.6°C | 7.6°C | 113 mm | 80% | 0.7 m/s | 5.2 |
| 1988 | 32.1°C | 25.4°C | 18.7°C | 37.6°C | 13.5°C | 88 mm | 62% | 0.8 m/s | 5.1 |
| 1987 | 32.3°C | 25.5°C | 18.8°C | 35.5°C | 13.4°C | 58 mm | 60% | 0.9 m/s | 5.2 |
| 1986 | 29.0°C | 22.8°C | 16.6°C | 33.7°C | 5.3°C | 131 mm | 69% | 0.8 m/s | 4.9 |
| 1985 | 27.6°C | 22.1°C | 16.6°C | 33.3°C | 11.4°C | 117 mm | 74% | 0.8 m/s | 4.6 |
| 1984 | 28.3°C | 22.6°C | 16.9°C | 30.7°C | 11.1°C | 64 mm | 73% | 0.8 m/s | 5 |
| 1983 | 31.9°C | 25.4°C | 18.9°C | 37.9°C | 12.4°C | 87 mm | 62% | 0.8 m/s | — |
| 1982 | 28.0°C | 22.1°C | 16.2°C | 32.0°C | 10.9°C | 135 mm | 73% | 0.8 m/s | — |
| 1981 | 29.3°C | 22.9°C | 16.5°C | 32.5°C | 11.2°C | 78 mm | 65% | 0.8 m/s | — |
Actual recorded August data for each year, 1981–2025 — sourced from NASA POWER.
The average high in August is around 29.6°C with lows near 17.6°C (mean 23.6°C), based on 45 years of NASA POWER data.
August averages 98 mm of rainfall in Johnson City, about average for rainfall. The wettest on record was 162 mm in 2021.
The hottest August reached 37.9°C in 1983. The coldest dipped to 5.3°C in 1986.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average August temperatures have risen by about 0.8°C. Daytime highs moved from 29°C to 29.4°C and overnight lows from 17°C to 18.1°C over the same span.
August is one of the warmer months of the year in Johnson City and about average for rainfall, so plan for around 29.6°C daytime highs and 17.6°C at night.
Not quite — August is the 11th coolest month in Johnson City, averaging 23.6°C.
For August in Johnson City, pack light layers you can adjust through the day, with typical highs of 29.6°C and lows of 17.6°C. Bring an umbrella or light rain jacket too.
Relative humidity in August averages 70% — moderately humid.
Average wind speed in August is 0.8 m/s. The windiest August on record averaged 1 m/s (1995).
The wettest August on record was 2021 with 162 mm. On average, August sees 98 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 Johnson City 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.
