ERA5 almanac comparison — 8 years of real data
Charleston vs Houston: weather in October
Essentially a tie in October: Charleston is 45% clear historically, Houston is 44% clear (8-year ERA5 average) — within the noise. Avg high 76°F vs 81°F. Pick based on flight time or price, not weather — the weather won't decide this one for you.
Charleston
SC
- Clear days, October
- 45%
- Sample size
- n=248 days
- Avg high
- 76°F
- Early October (1st–15th)
- 47%
- Late October (16th–end)
- 43%
- Rain frequency
- 24% of days
Houston
TX
- Clear days, October
- 44%
- Sample size
- n=248 days
- Avg high
- 81°F
- Early October (1st–15th)
- 53%
- Late October (16th–end)
- 35%
- Rain frequency
- 35% of days
Frequently asked
Is Charleston or Houston warmer in October?
Houston runs warmer by day in October. Charleston averages highs of 76°F (highs n=248 days); Houston averages highs of 81°F (highs n=248 days) (ERA5 2018–2025). Historical averages, not a forecast.
Does it rain more in Charleston or Houston in October?
Days with measurable rain: Charleston 24%, Houston 35% (n=248 and n=248 days). ERA5 2018–2025; historical, not a forecast.
Which is sunnier in October, Charleston or Houston?
Essentially a tie in October: Charleston is 45% clear historically, Houston is 44% clear (8-year ERA5 average) — within the noise. Avg high 76°F vs 81°F. Pick based on flight time or price, not weather — the weather won't decide this one for you.
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.