As of 11:02 CDT

Weather in Herculaneum, MO

55°

Herculaneum, Saturday, 17 October, 11:02

Clear. Feels like 53°. High 56°, low 42°.

Pressure30.56 inHg

Wind4 mph NE

Humidity62%

Visibility6.2 mi

Dew point42°

See detailed hourly forecast

Sun, 1864° / 43°

64 °

Herculaneum, Sunday, 18 October

Clear. High 64°, low 43°.

Pressure30.47 inHg

Wind5.7 mph S

Humidity45%

Visibility6.2 mi

Dew point38°

Mon, 1967° / 44°

67 °

Herculaneum, Monday, 19 October

Clear. High 67°, low 44°.

Pressure30.39 inHg

Wind1.6 mph SE

Humidity49%

Visibility6.2 mi

Dew point45°

Tue, 2069° / 45°

69 °

Herculaneum, Tuesday, 20 October

Clear. High 69°, low 45°.

Pressure30.36 inHg

Wind2.9 mph SE

Humidity55%

Visibility3.2 mi

Dew point49°

Wed, 2171° / 47°

71 °

Herculaneum, Wednesday, 21 October

Clear. High 71°, low 47°.

Pressure30.27 inHg

Wind2.9 mph SE

Humidity45%

Visibility—

Dew point45°

Thu, 2272° / 50°

72 °

Herculaneum, Thursday, 22 October

Clear. High 72°, low 50°.

Pressure30.24 inHg

Wind3.8 mph E

Humidity43%

Visibility—

Dew point45°

Fri, 2379° / 55°

79 °

Herculaneum, Friday, 23 October

Partly cloudy. High 79°, low 55°.

Pressure30.12 inHg

Wind7.2 mph SE

Humidity29%

Visibility—

Dew point40°

Sat, 2478° / 59°

78 °

Herculaneum, Saturday, 24 October

Overcast. High 78°, low 59°.

Pressure30.12 inHg

Wind9.8 mph S

Humidity30%

Visibility—

Dew point41°

Sun, 2579° / 64°

0.04

79 °

Herculaneum, Sunday, 25 October

Light rain. High 79°, low 64°.

Pressure30.09 inHg

Wind8.6 mph W

Humidity39%

Visibility—

Dew point50°

Mon, 2680° / 60°

80 °

Herculaneum, Monday, 26 October

Clear. High 80°, low 60°.

Pressure30.15 inHg

Wind5.8 mph SE

Humidity46%

Visibility—

Dew point53°

Tue, 2777° / 62°

77 °

Herculaneum, Tuesday, 27 October

Overcast. High 77°, low 62°.

Pressure30.06 inHg

Wind12.9 mph S

Humidity30%

Visibility—

Dew point42°

Wed, 2867° / 64°

0.05

67 °

Herculaneum, Wednesday, 28 October

Light rain. High 67°, low 64°.

Pressure29.97 inHg

Wind15 mph S

Humidity73%

Visibility—

Dew point56°

Thu, 2969° / 61°

0.04

69 °

Herculaneum, Thursday, 29 October

Light rain. High 69°, low 61°.

Pressure30.06 inHg

Wind9.8 mph NE

Humidity36%

Visibility—

Dew point40°

Fri, 3079° / 64°

0.1

79 °

Herculaneum, Friday, 30 October

Light rain. High 79°, low 64°.

Pressure29.77 inHg

Wind16.1 mph S

Humidity58%

Visibility—

Dew point61°

Sat, 3173° / 52°

0.24

73 °

Herculaneum, Saturday, 31 October

Light rain. High 73°, low 52°.

Pressure29.85 inHg

Wind17.6 mph S

Humidity31%

Visibility—

Dew point38°

Sun, 0168° / 46°

68 °

Herculaneum, Sunday, 1 November

Clear. High 68°, low 46°.

Pressure30.15 inHg

Wind5.7 mph E

Humidity33%

Visibility—

Dew point33°

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 Herculaneum, MO 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 Herculaneum, MO 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.