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As of 07:39 CDT

Weather in Portland, IL

70°Current weather

Portland, Sunday, 9 August, 07:39

Mostly clear. Feels like 71°. High 90°, low 65°.

Pressure29.97 inHg
Wind5.5 mph S
Humidity89%
Visibility6.2 mi
Dew point67°
Mon, 1092° / 73°0.02Light rain
92 °Light rain

Portland, Monday, 10 August

Light rain. High 92°, low 73°.

Pressure29.85 inHg
Wind4.1 mph E
Humidity77%
Visibility6.2 mi
Dew point75°
Tue, 1188° / 69°0.04Light rain
88 °Light rain

Portland, Tuesday, 11 August

Light rain. High 88°, low 69°.

Pressure29.80 inHg
Wind6.1 mph SW
Humidity71%
Visibility6.2 mi
Dew point72°
Wed, 1284° / 68°0.06Light rain
84 °Light rain

Portland, Wednesday, 12 August

Light rain. High 84°, low 68°.

Pressure29.85 inHg
Wind6.2 mph NE
Humidity73%
Visibility6.2 mi
Dew point72°
Thu, 1375° / 62°0.54Heavy rain
75 °Heavy rain

Portland, Thursday, 13 August

Heavy rain. High 75°, low 62°.

Pressure30.03 inHg
Wind9.2 mph NE
Humidity73%
Visibility—
Dew point64°
Fri, 1473° / 61°0.14Light rain
73 °Light rain

Portland, Friday, 14 August

Light rain. High 73°, low 61°.

Pressure30.15 inHg
Wind13.1 mph E
Humidity64%
Visibility—
Dew point58°
Sat, 1574° / 62°0.06Light rain
74 °Light rain

Portland, Saturday, 15 August

Light rain. High 74°, low 62°.

Pressure30.21 inHg
Wind10.8 mph SE
Humidity68%
Visibility—
Dew point61°
Sun, 1677° / 65°0.02Light rain
77 °Light rain

Portland, Sunday, 16 August

Light rain. High 77°, low 65°.

Pressure30.09 inHg
Wind5.6 mph E
Humidity84%
Visibility—
Dew point68°
Mon, 1781° / 65°0Overcast
81 °Overcast

Portland, Monday, 17 August

Overcast. High 81°, low 65°.

Pressure30.09 inHg
Wind5.6 mph E
Humidity68%
Visibility—
Dew point66°
Tue, 1881° / 64°0Overcast
81 °Overcast

Portland, Tuesday, 18 August

Overcast. High 81°, low 64°.

Pressure30.00 inHg
Wind10 mph S
Humidity73%
Visibility—
Dew point68°
Wed, 1991° / 71°0Overcast
91 °Overcast

Portland, Wednesday, 19 August

Overcast. High 91°, low 71°.

Pressure29.83 inHg
Wind13.1 mph S
Humidity72%
Visibility—
Dew point74°
Thu, 2092° / 76°0Overcast
92 °Overcast

Portland, Thursday, 20 August

Overcast. High 92°, low 76°.

Pressure29.77 inHg
Wind9.9 mph S
Humidity62%
Visibility—
Dew point71°
Fri, 2186° / 73°0Mostly clear
86 °Mostly clear

Portland, Friday, 21 August

Mostly clear. High 86°, low 73°.

Pressure29.94 inHg
Wind13.1 mph NE
Humidity61%
Visibility—
Dew point68°
Sat, 2292° / 68°0Clear
92 °Clear

Portland, Saturday, 22 August

Clear. High 92°, low 68°.

Pressure29.83 inHg
Wind11.3 mph SE
Humidity65%
Visibility—
Dew point73°
Sun, 2392° / 76°0Overcast
92 °Overcast

Portland, Sunday, 23 August

Overcast. High 92°, low 76°.

Pressure29.80 inHg
Wind18.1 mph S
Humidity53%
Visibility—
Dew point70°
Mon, 2485° / 67°0.58Rain
85 °Rain

Portland, Monday, 24 August

Rain. High 85°, low 67°.

Pressure30.03 inHg
Wind13 mph E
Humidity73%
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 Portland, 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 Portland, 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.