As of 19:20 EDT

Weather in Sumter, SC

73°

Sumter, Thursday, 8 October, 19:20

Overcast. Feels like 73°. High 81°, low 56°.

Pressure29.97 inHg

Wind0 mph N

Humidity74%

Visibility6.2 mi

Dew point63°

See detailed hourly forecast

Fri, 0978° / 61°

78 °

Sumter, Friday, 9 October

Overcast. High 78°, low 61°.

Pressure30.18 inHg

Wind7.8 mph NE

Humidity43%

Visibility6.2 mi

Dew point51°

Sat, 1071° / 60°

1.46

71 °

Sumter, Saturday, 10 October

Heavy rain. High 71°, low 60°.

Pressure30.12 inHg

Wind14.7 mph E

Humidity96%

Visibility3.0 mi

Dew point68°

Sun, 1184° / 68°

0.23

84 °

Sumter, Sunday, 11 October

Rain. High 84°, low 68°.

Pressure29.97 inHg

Wind11.4 mph S

Humidity85%

Visibility3.0 mi

Dew point75°

Mon, 1282° / 65°

82 °

Sumter, Monday, 12 October

Partly cloudy. High 82°, low 65°.

Pressure29.94 inHg

Wind7.9 mph NW

Humidity58%

Visibility6.2 mi

Dew point62°

Tue, 1385° / 61°

85 °

Sumter, Tuesday, 13 October

Clear. High 85°, low 61°.

Pressure29.94 inHg

Wind4.3 mph W

Humidity40%

Visibility—

Dew point55°

Wed, 1490° / 65°

90 °

Sumter, Wednesday, 14 October

Clear. High 90°, low 65°.

Pressure29.97 inHg

Wind3.5 mph S

Humidity39%

Visibility—

Dew point58°

Thu, 1588° / 70°

88 °

Sumter, Thursday, 15 October

Clear. High 88°, low 70°.

Pressure30.18 inHg

Wind5.7 mph S

Humidity42%

Visibility—

Dew point60°

Fri, 1688° / 69°

88 °

Sumter, Friday, 16 October

Clear. High 88°, low 69°.

Pressure30.15 inHg

Wind5.6 mph S

Humidity45%

Visibility—

Dew point62°

Sat, 1790° / 71°

0.03

90 °

Sumter, Saturday, 17 October

Light rain. High 90°, low 71°.

Pressure29.97 inHg

Wind16.9 mph NE

Humidity42%

Visibility—

Dew point61°

Sun, 1866° / 53°

66 °

Sumter, Sunday, 18 October

Overcast. High 66°, low 53°.

Pressure30.30 inHg

Wind19.3 mph NE

Humidity30%

Visibility—

Dew point32°

Mon, 1963° / 46°

63 °

Sumter, Monday, 19 October

Clear. High 63°, low 46°.

Pressure30.47 inHg

Wind15.5 mph NE

Humidity25%

Visibility—

Dew point24°

Tue, 2068° / 44°

68 °

Sumter, Tuesday, 20 October

Clear. High 68°, low 44°.

Pressure30.36 inHg

Wind10.3 mph NE

Humidity28%

Visibility—

Dew point30°

Wed, 2174° / 48°

74 °

Sumter, Wednesday, 21 October

Clear. High 74°, low 48°.

Pressure30.27 inHg

Wind8.5 mph NE

Humidity42%

Visibility—

Dew point45°

Thu, 2274° / 57°

74 °

Sumter, Thursday, 22 October

Overcast. High 74°, low 57°.

Pressure30.18 inHg

Wind7 mph NE

Humidity49%

Visibility—

Dew point52°

Fri, 2379° / 57°

79 °

Sumter, Friday, 23 October

Clear. High 79°, low 57°.

Pressure30.12 inHg

Wind6.2 mph N

Humidity34%

Visibility—

Dew point46°

About the monthly outlook

How accurate is a 30-day forecast?

The first 16 days come from weather models — reliable for the first 3–5 days and progressively less so after that. Days 17 through 30 for Sumter, SC are built from the climate normal, the 60-year average, so they show typical weather for those dates rather than a specific forecast.

What does "above normal" mean?

We compare the forecast against the climate normal for those exact calendar days, computed from 60 years of observations. The deviation shows how much the coming month differs from a typical one.

Where do the 66-year records come from?

They are real temperature extremes recorded in Sumter, SC since 1960: the highest and lowest reading for each calendar date, with the year it happened.

How often is it updated?

The forecast portion refreshes every hour; the climate portion is based on long-term data and stays stable.