UV index is 7 today — high. Apply sunscreen before heading out, and consider a hat or shade during peak hours (roughly late morning to mid-afternoon).

Air quality is acceptable for most people. Unusually sensitive individuals should consider reducing prolonged or heavy outdoor exertion.

Morning before 10 AM or evening after 4 PM is the more comfortable window for outdoor activity today.

High humidity (80%) combined with the heat means it will feel more uncomfortable than the air temperature alone suggests — stay hydrated if you're active outside.

Nearby Regional Outlook

Charleston Weather Radar

Live precipitation · Cloud cover · Wind

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Frequently Asked Questions

What is the hottest month in Charleston?

The hottest month in Charleston is typically July, with daytime highs averaging around 31°C (88°F), based on 10 years of historical weather data. Overnight lows during this period average near 25.1°C (77°F).

What is the coldest month in Charleston?

The coldest month in Charleston is typically January, with overnight lows averaging around 6.4°C (44°F) and daytime highs near 14.2°C (58°F), based on 10 years of historical weather data.

Does Charleston have a rainy season?

Charleston doesn't have a sharply defined rainy season rainfall is fairly spread across the year based on 10 years of historical data. August is the wettest month on average (about 183 mm), while March is the driest (about 75 mm).

What's the best time of year to visit Charleston?

The best time to visit Charleston is typically March to April, when daytime highs average a comfortable 21.3°C (70°F). Rainfall during this window averages around 87 mm, one of the lighter, more comfortable stretches of the year. This is based on 10 years of historical weather data.

Is Charleston's air quality safe right now?

As of the latest reading, Charleston's air quality index (AQI) is 27, rated "Good", based on the nearest monitoring station. Air quality is considered satisfactory, with little to no health risk.

Atmospheric Details

Wind

9 km/h

SSW · Light Breeze · Max 21 km/h

Humidity

80 %

High · feels muggy

UV Index

High

Visibility

16 km

Excellent

Pressure

1016 hPa

Stable

Dew Point

26°C

Very humid

Today vs Normal

30°C0° below normal

The long-term average high for today is 30°C.

21 of the last 28 days with published data ran above normal.

That's a break from the pattern - today's forecast runs below normal even though the recent stretch mostly ran above.

Red = above normal, blue = at or below · last 12 days

Air Quality

Moderate

Air quality is acceptable for most people. Unusually sensitive individuals should consider reducing prolonged or heavy outdoor exertion.

Health & Activity Advice

⚠ Take Precautions

UV index is 7 today — high. Apply sunscreen before heading out, and consider a hat or shade during peak hours (roughly late morning to mid-afternoon).

Air quality is acceptable for most people. Unusually sensitive individuals should consider reducing prolonged or heavy outdoor exertion.

Morning before 10 AM or evening after 4 PM is the more comfortable window for outdoor activity today.

High humidity (80%) combined with the heat means it will feel more uncomfortable than the air temperature alone suggests — stay hydrated if you're active outside.