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Charleston, SC Weather Forecast

View the 9-day weather forecast for Charleston, South Carolina, including daily highs and lows, rain chances, rainfall amounts, wind speeds, humidity, and short-range versus extended BlendedModel guidance.

The latest 9-day BlendedModel forecast for Charleston, South Carolina is in. The warmest stretch peaks on Tue near 90, while the coolest low settles in on Sun near 73. The best rain signal shows up on Thu at 70 percent and about 0.45 inches. The outlook starts with a near-term signal before shifting to extended signal later in the period.

Forecast data refreshed automatically every few hours. Showing the latest available BlendedModel forecast for Charleston, South Carolina.

Last updated:

Latest BlendedModel forecast loaded for Charleston, South Carolina.

About BlendedModel
BlendedModel is an experimental forecast system developed by Engineer.Guide Research and Development Lab. Forecast pages are refreshed automatically every few hours so you always see the latest guidance.

9-Day Outlook for Charleston, South Carolina

A scan-first 9-day view generated for fast daily reading, with the main call for each day and the core details underneath.

Today's Weather Story
Today looks rain likely with a solid rain chance, wind near 15 mph, and humid air, and a thunderstorm possible.
National Weather Service
Special Marine Warning
Special Marine Warning issued June 18 at 6:07PM EDT until June 18 at 7:00PM EDT by NWS Charleston SC
Severe · Immediate · Starts 2026-06-18T18:07:00-04:00 · Expires 2026-06-18T19:00:00-04:00
Check Hourly Timing
A quick look at the next several hours for temperature, rain chance, wind, and storm signal.
2 PM EDT
79°
Cloudy
Precip 0% · Wind 12 mph
Low Storm Signal · Near-Term Signal
3 PM EDT
77°
Rain
Precip 70% · Wind 14 mph
4 PM EDT
77°
Cloudy
Precip 0% · Wind 7 mph
5 PM EDT
81°
Cloudy
Precip 0% · Wind 9 mph
Low Storm Signal · Near-Term Signal
6 PM EDT
82°
Cloudy
Precip 0% · Wind 9 mph
Low Storm Signal · Near-Term Signal
7 PM EDT
81°
Cloudy
Precip 0% · Wind 7 mph
Low Storm Signal · Near-Term Signal
8 PM EDT
81°
Cloudy
Precip 0% · Wind 9 mph
Low Storm Signal · Near-Term Signal
9 PM EDT
81°
Cloudy
Precip 0% · Wind 15 mph
Low Storm Signal · Near-Term Signal
10 PM EDT
80°
Rain
Precip 20% · Wind 10 mph
11 PM EDT
80°
Cloudy
Precip 0% · Wind 14 mph
12 AM EDT
81°
Cloudy
Precip 0% · Wind 15 mph
Low Storm Signal · Near-Term Signal
1 AM EDT
81°
Cloudy
Precip 0% · Wind 18 mph
Low Storm Signal · Near-Term Signal
Thu
Jun 18
82°
Low 77°
Near-Term Signal
Rain likely
Precip 70% · Rain 0.45 in · Wind 15 mph · Humidity 92%
Thunder Index
46/100
Thunderstorm Possible
A 0-100 signal blending near-term storm ingredients with extended pattern guidance.
Storm Signal
Early guidance signal
Check hourly timing Radar near Charleston
Fri
Jun 19
84°
Low 78°
Near-Term Signal
Light rain possible
Precip 20% · Rain 0.04 in · Wind 23 mph · Humidity 89%
Thunder Index
28/100
Low Storm Signal
Storm Signal
Early guidance signal
Sat
Jun 20
83°
Low 77°
Extended Signal
Light rain possible
Precip 55% · Rain 0.26 in · Wind 8 mph · Humidity 89%
Thunder Index
44/100
Thunderstorm Possible
Storm Signal
Early guidance signal
Check hourly timing Radar near Charleston
Sun
Jun 21
88°
Low 73°
Extended Signal
Humid
Precip 20% · Rain 0.00 in · Wind 8 mph · Humidity 95%
Thunder Index
30/100
Low Storm Signal
Storm Signal
Early guidance signal
Mon
Jun 22
86°
Low 76°
Extended Signal
Light rain possible
Precip 35% · Rain 0.14 in · Wind 9 mph · Humidity 88%
Thunder Index
34/100
Low Storm Signal
Storm Signal
Early guidance signal
Tue
Jun 23
90°
Low 79°
Extended Signal
Light rain possible
Precip 35% · Rain 0.10 in · Wind 11 mph · Humidity 84%
Thunder Index
35/100
Low Storm Signal
Storm Signal
Early guidance signal
Wed
Jun 24
89°
Low 78°
Extended Signal
Humid
Precip 35% · Rain 0.05 in · Wind 9 mph · Humidity 85%
Thunder Index
30/100
Low Storm Signal
Storm Signal
Early guidance signal
Thu
Jun 25
85°
Low 76°
Extended Signal
Light rain possible
Precip 55% · Rain 0.23 in · Wind 4 mph · Humidity 86%
Thunder Index
41/100
Thunderstorm Possible
Storm Signal
Early guidance signal
Check hourly timing Radar near Charleston
Fri
Jun 26
84°
Low 76°
Extended Signal
Light rain possible
Precip 70% · Rain 0.41 in · Wind 9 mph · Humidity 91%
Thunder Index
50/100
Thunderstorm Possible
Storm Signal
Early guidance signal
Check hourly timing Radar near Charleston
Official alerts, when active, come from the National Weather Service.

Charleston Weather Questions, Answered

Quick answers generated from the latest 9-day BlendedModel forecast for Charleston, South Carolina.

Will it rain today in Charleston?

Yes, rain is likely in Charleston, SC today with a 70 percent chance of precipitation. Around 0.45 inches is expected.

How hot will it get in Charleston today?

Today's forecast for Charleston, SC calls for a high near 82 degrees and a low around 77 degrees.

Are thunderstorms expected in Charleston this week?

Thunderstorms are possible in Charleston, SC this week. The highest storm signal is on Fri with a Thunder Index of 50 out of 100.

What is the warmest day this week in Charleston?

Tue looks like the warmest day in Charleston, SC, with a high near 90 degrees.

Nearby Forecasts

Quick links to a few nearby cities if you want to compare the next 9 days around Charleston, South Carolina.

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