April is one of the cooler months of the year in Chattanooga, with average highs near 20.9°C and lows around 8.7°C (mean 14.8°C). It is about average for rainfall, averaging 112 mm of rainfall and 78% relative humidity across the period.
April is one of the cooler months of the year in Chattanooga. Across 45 years of records, the warmest April in Chattanooga was 2017 — when the month averaged 17.9°C — while the coldest was 1983 at 11.8°C. Typical April days reach 20.9°C with nights near 8.7°C. The long-term trend is warming, about 0.4°C per decade.
April is about average for rainfall in Chattanooga, averaging 112 mm of rainfall. The wettest April on record was 1998 with 218 mm, while the driest was 2012 at 34 mm.
Relative humidity in Chattanooga during April averages 78%. The most humid April was 1984 at 84%, and the least humid was 1986 at 68%.
April receives about 5.2 kWh/m²/day of solar energy in Chattanooga. The sunniest April was 2010 at 5.9 kWh/m²/day, and the cloudiest was 1998 at 4.3.
Average wind speed in Chattanooga during April is 0.5 m/s. The windiest Aprils were 2019, 2020 and 2021, among others at 0.6 m/s, while the calmest were 2023, 2024 and 2025, among others at 0.5 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 13.9°C | 14.3°C | 15.0°C | 15.7°C | 15.1°C | +1.2°C |
| Avg High | 20.1°C | 20.4°C | 21.2°C | 21.8°C | 21.2°C | +1.1°C |
| Avg Low | 7.7°C | 8.3°C | 8.9°C | 9.5°C | 8.9°C | +1.2°C |
| Avg Rain | 104 mm | 112 mm | 98 mm | 132 mm | 109 mm | +5 mm |
April temperatures in Chattanooga have risen by about 1.5°C between 1981–1985 and 2021–2025.
April has ranged from a record low of -5.1°C (2007) to a record high of 32.1°C (1986).
Rainfall in April is about average for rainfall, averaging 112 mm, with a wettest year of 218 mm.
A good time to visit Chattanooga
April is a good time to visit Chattanooga, with days averaging 20.9°C and nights around 8.7°C (mean 14.8°C, close to Chattanooga's yearly average) and higher rainfall. September and May are marginally more temperate, but April still suits most travellers.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 23.2°C | 17.0°C | 10.9°C | 29.5°C | -0.1°C | 137 mm | 79% | 0.5 m/s | 5.2 |
| 2024 | 22.1°C | 16.1°C | 10.2°C | 28.7°C | 1.2°C | 81 mm | 77% | 0.5 m/s | 5 |
| 2023 | 20.9°C | 14.8°C | 8.6°C | 27.1°C | 2.6°C | 131 mm | 78% | 0.5 m/s | 5.2 |
| 2022 | 20.6°C | 14.1°C | 7.7°C | 27.3°C | 0.4°C | 89 mm | 78% | 0.5 m/s | 5.3 |
| 2021 | 20.7°C | 14.6°C | 8.5°C | 26.5°C | -2.4°C | 43 mm | 74% | 0.6 m/s | 5.7 |
| 2020 | 19.9°C | 13.8°C | 7.7°C | 26.0°C | 1.4°C | 175 mm | 78% | 0.6 m/s | 5.3 |
| 2019 | 22.3°C | 16.3°C | 10.3°C | 28.8°C | -1.7°C | 115 mm | 78% | 0.6 m/s | 5.5 |
| 2018 | 19.1°C | 12.6°C | 6.1°C | 24.0°C | -1.9°C | 149 mm | 78% | 0.5 m/s | 5 |
| 2017 🔥 | 23.9°C | 17.9°C | 11.9°C | 28.8°C | 3.0°C | 176 mm | 79% | 0.5 m/s | 5.3 |
| 2016 | 21.5°C | 15.2°C | 8.9°C | 28.0°C | 1.0°C | 67 mm | 77% | 0.5 m/s | 5.7 |
| 2015 | 21.7°C | 15.9°C | 10.1°C | 26.6°C | 1.0°C | 151 mm | 82% | 0.5 m/s | 4.7 |
| 2014 | 21.5°C | 15.1°C | 8.6°C | 27.5°C | -1.6°C | 142 mm | 80% | 0.5 m/s | 5.5 |
| 2013 | 20.1°C | 14.4°C | 8.6°C | 26.7°C | 1.5°C | 207 mm | 81% | 0.5 m/s | 5.1 |
| 2012 | 22.5°C | 16.4°C | 10.3°C | 29.5°C | 1.2°C | 34 mm | 77% | 0.5 m/s | 5.7 |
| 2011 | 22.5°C | 16.3°C | 10.1°C | 28.3°C | 1.6°C | 195 mm | 79% | 0.6 m/s | 5.3 |
| 2010 | 23.0°C | 16.4°C | 9.8°C | 28.4°C | 4.1°C | 85 mm | 76% | 0.5 m/s | 5.9 |
| 2009 | 20.0°C | 14.1°C | 8.1°C | 28.5°C | -1.3°C | 95 mm | 80% | 0.6 m/s | 5 |
| 2008 | 20.6°C | 14.5°C | 8.3°C | 26.0°C | 1.0°C | 88 mm | 78% | 0.5 m/s | 5.2 |
| 2007 | 20.3°C | 13.6°C | 6.9°C | 30.5°C | -5.1°C | 80 mm | 70% | 0.6 m/s | 5.5 |
| 2006 | 23.6°C | 17.2°C | 10.9°C | 28.0°C | 1.5°C | 121 mm | 78% | 0.5 m/s | 5.5 |
| 2005 | 20.6°C | 14.5°C | 8.4°C | 25.6°C | -0.1°C | 113 mm | 80% | 0.5 m/s | 4.7 |
| 2004 | 21.2°C | 14.8°C | 8.3°C | 28.1°C | -0.1°C | 62 mm | 77% | 0.5 m/s | 5.5 |
| 2003 | 21.7°C | 15.8°C | 9.9°C | 27.7°C | 3.1°C | 134 mm | 82% | 0.5 m/s | 5.1 |
| 2002 | 22.5°C | 16.5°C | 10.6°C | 29.6°C | 1.1°C | 44 mm | 79% | 0.5 m/s | 5.2 |
| 2001 | 22.2°C | 16.2°C | 10.3°C | 29.4°C | -0.5°C | 65 mm | 79% | 0.5 m/s | 5.4 |
| 2000 | 19.5°C | 13.3°C | 7.1°C | 25.9°C | -2.7°C | 181 mm | 80% | 0.6 m/s | 4.5 |
| 1999 | 22.2°C | 16.3°C | 10.5°C | 28.6°C | 1.3°C | 88 mm | 81% | 0.5 m/s | 5.2 |
| 1998 🌧️ | 19.7°C | 14.3°C | 9.0°C | 24.7°C | 3.1°C | 218 mm | 82% | 0.6 m/s | 4.3 |
| 1997 | 18.7°C | 12.4°C | 6.0°C | 24.2°C | -0.8°C | 109 mm | 76% | 0.5 m/s | 5.6 |
| 1996 | 19.0°C | 12.5°C | 6.0°C | 25.9°C | -2.2°C | 104 mm | 78% | 0.6 m/s | 5.1 |
| 1995 | 21.7°C | 15.2°C | 8.8°C | 28.1°C | 1.7°C | 68 mm | 77% | 0.5 m/s | 5.6 |
| 1994 | 22.3°C | 16.2°C | 10.1°C | 28.7°C | 0.0°C | 157 mm | 81% | 0.5 m/s | 5.6 |
| 1993 | 18.4°C | 12.4°C | 6.3°C | 23.8°C | -2.3°C | 87 mm | 79% | 0.6 m/s | 4.8 |
| 1992 | 20.1°C | 14.1°C | 8.0°C | 27.0°C | -3.4°C | 61 mm | 79% | 0.5 m/s | 5.2 |
| 1991 | 22.1°C | 16.7°C | 11.3°C | 26.7°C | 2.5°C | 152 mm | 82% | 0.5 m/s | 4.6 |
| 1990 | 19.8°C | 13.2°C | 6.7°C | 27.3°C | -3.0°C | 75 mm | 79% | 0.5 m/s | 5.4 |
| 1989 | 19.8°C | 13.7°C | 7.7°C | 27.8°C | -3.1°C | 116 mm | 79% | 0.5 m/s | 5.4 |
| 1988 | 20.3°C | 14.0°C | 7.7°C | 27.8°C | 1.9°C | 98 mm | 77% | 0.6 m/s | 5.6 |
| 1987 | 19.2°C | 13.1°C | 6.9°C | 28.6°C | -3.6°C | 58 mm | 79% | 0.5 m/s | 5.4 |
| 1986 | 22.5°C | 15.2°C | 8.0°C | 32.1°C | -2.3°C | 37 mm | 68% | 0.5 m/s | 5.6 |
| 1985 | 21.6°C | 15.2°C | 8.9°C | 27.8°C | -2.7°C | 73 mm | 76% | 0.5 m/s | 5.6 |
| 1984 | 18.7°C | 13.2°C | 7.7°C | 26.5°C | 0.4°C | 154 mm | 84% | 0.5 m/s | 4.4 |
| 1983 ❄️ | 17.7°C | 11.8°C | 5.9°C | 24.4°C | -4.5°C | 175 mm | 81% | 0.6 m/s | — |
| 1982 | 18.1°C | 12.2°C | 6.4°C | 25.6°C | -4.4°C | 128 mm | 79% | 0.6 m/s | — |
| 1981 | 23.1°C | 16.8°C | 10.4°C | 27.9°C | 2.5°C | 101 mm | 79% | 0.5 m/s | — |
Actual recorded April data for each year, 1981–2025 — sourced from NASA POWER.
The average high in April is around 20.9°C with lows near 8.7°C (mean 14.8°C), based on 45 years of NASA POWER data.
April averages 112 mm of rainfall in Chattanooga, about average for rainfall. The wettest on record was 218 mm in 1998.
The hottest April reached 32.1°C in 1986. The coldest dipped to -5.1°C in 2007.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average April temperatures have risen by about 1.5°C. Daytime highs moved from 19.8°C to 21.5°C and overnight lows from 7.9°C to 9.2°C over the same span.
April is one of the cooler months of the year in Chattanooga and about average for rainfall, so plan for around 20.9°C daytime highs and 8.7°C at night.
Not quite — April is the 6th coolest month in Chattanooga, averaging 14.8°C.
For April in Chattanooga, pack light layers you can adjust through the day, with typical highs of 20.9°C and lows of 8.7°C. Bring an umbrella or light rain jacket too.
Relative humidity in April averages 78% — quite humid.
Average wind speed in April is 0.5 m/s. The windiest April on record averaged 0.6 m/s (1982).
The wettest April on record was 1998 with 218 mm. On average, April sees 112 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 Chattanooga behaves each April, 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 April specifically, along with year-by-year records and how the month has changed over the decades.
