ERA5 almanac comparison — 8 years of real data
Charleston vs Houston: weather in August
Houston edges out Charleston for sun in August: 23% clear historically versus 12% (8-year ERA5 average, a 11-point gap). Both are viable — Houston is the safer bet.
Charleston
SC
- Clear days, August
- 12%
- Sample size
- n=248 days
- Avg high
- 85°F
- Early August (1st–15th)
- 11%
- Late August (16th–end)
- 12%
- Rain frequency
- 62% of days
Houston
TX
- Clear days, August
- 23%
- Sample size
- n=248 days
- Avg high
- 92°F
- Early August (1st–15th)
- 22%
- Late August (16th–end)
- 23%
- Rain frequency
- 55% of days
Frequently asked
Is Charleston or Houston warmer in August?
Houston runs warmer by day in August. Charleston averages highs of 85°F (highs n=248 days); Houston averages highs of 92°F (highs n=248 days) (ERA5 2018–2025). Historical averages, not a forecast.
Does it rain more in Charleston or Houston in August?
Days with measurable rain: Charleston 62%, Houston 55% (n=248 and n=248 days). ERA5 2018–2025; historical, not a forecast.
Which is sunnier in August, Charleston or Houston?
Houston edges out Charleston for sun in August: 23% clear historically versus 12% (8-year ERA5 average, a 11-point gap). Both are viable — Houston is the safer bet.
Compare Charleston vs Houston in another month
All percentages are historical averages from the ERA5 reanalysis via Open-Meteo, 8 full years (2018–2025). “Clear” means avg high ≥ 72 °F, precipitation < 1 mm, and a non-precipitation weather code. This is history, not a forecast. The live forecast for any destination is on its own page and may differ from the long-run average. Data from Open-Meteo.