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As of 20:29 CDT

Weather in Jamestown, IL

80°Current weather

Jamestown, Saturday, 8 August, 20:29

Clear. Feels like 85°. High 90°, low 71°.

Pressure30.00 inHg
Wind3.7 mph E
Humidity80%
Visibility6.2 mi
Dew point73°
Sun, 0995° / 74°0Overcast
95 °Overcast

Jamestown, Sunday, 9 August

Overcast. High 95°, low 74°.

Pressure30.00 inHg
Wind12.5 mph S
Humidity65%
Visibility6.2 mi
Dew point73°
Mon, 1095° / 74°0Partly cloudy
95 °Partly cloudy

Jamestown, Monday, 10 August

Partly cloudy. High 95°, low 74°.

Pressure29.97 inHg
Wind13.1 mph SW
Humidity59%
Visibility6.2 mi
Dew point74°
Tue, 1198° / 74°0.06Light rain
98 °Light rain

Jamestown, Tuesday, 11 August

Light rain. High 98°, low 74°.

Pressure29.88 inHg
Wind10.8 mph SW
Humidity56%
Visibility6.2 mi
Dew point73°
Wed, 1288° / 71°0.18Rain
88 °Rain

Jamestown, Wednesday, 12 August

Rain. High 88°, low 71°.

Pressure29.88 inHg
Wind7.4 mph W
Humidity74%
Visibility6.2 mi
Dew point73°
Thu, 1382° / 69°2.31Heavy rain
82 °Heavy rain

Jamestown, Thursday, 13 August

Heavy rain. High 82°, low 69°.

Pressure29.94 inHg
Wind15.3 mph E
Humidity73%
Visibility—
Dew point71°
Fri, 1474° / 68°0.74Heavy rain
74 °Heavy rain

Jamestown, Friday, 14 August

Heavy rain. High 74°, low 68°.

Pressure30.03 inHg
Wind11.2 mph E
Humidity91%
Visibility—
Dew point69°
Sat, 1577° / 67°0.17Light rain
77 °Light rain

Jamestown, Saturday, 15 August

Light rain. High 77°, low 67°.

Pressure30.18 inHg
Wind14.9 mph E
Humidity76%
Visibility—
Dew point66°
Sun, 1679° / 65°0.2Light rain
79 °Light rain

Jamestown, Sunday, 16 August

Light rain. High 79°, low 65°.

Pressure30.06 inHg
Wind9.3 mph E
Humidity82%
Visibility—
Dew point71°
Mon, 1781° / 68°0.09Light rain
81 °Light rain

Jamestown, Monday, 17 August

Light rain. High 81°, low 68°.

Pressure30.03 inHg
Wind6.8 mph NE
Humidity86%
Visibility—
Dew point70°
Tue, 1882° / 68°0.04Light rain
82 °Light rain

Jamestown, Tuesday, 18 August

Light rain. High 82°, low 68°.

Pressure30.00 inHg
Wind5.7 mph E
Humidity79%
Visibility—
Dew point73°
Wed, 1983° / 70°0Overcast
83 °Overcast

Jamestown, Wednesday, 19 August

Overcast. High 83°, low 70°.

Pressure29.91 inHg
Wind13.3 mph N
Humidity72%
Visibility—
Dew point71°
Thu, 2075° / 57°0Mostly clear
75 °Mostly clear

Jamestown, Thursday, 20 August

Mostly clear. High 75°, low 57°.

Pressure30.03 inHg
Wind11.6 mph NE
Humidity63%
Visibility—
Dew point58°
Fri, 2175° / 56°0.01Light rain
75 °Light rain

Jamestown, Friday, 21 August

Light rain. High 75°, low 56°.

Pressure30.03 inHg
Wind9.5 mph E
Humidity60%
Visibility—
Dew point56°
Sat, 2285° / 62°0.15Light rain
85 °Light rain

Jamestown, Saturday, 22 August

Light rain. High 85°, low 62°.

Pressure29.85 inHg
Wind12.1 mph SE
Humidity69%
Visibility—
Dew point67°
Sun, 2390° / 70°0.01Light rain
90 °Light rain

Jamestown, Sunday, 23 August

Light rain. High 90°, low 70°.

Pressure29.94 inHg
Wind7.8 mph NE
Humidity65%
Visibility—
Dew point71°

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 Jamestown, IL 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 Jamestown, IL 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.