10-day forecast for Portland, IA: 55° to 86°, with precipitation expected on 4 days. The table below breaks each day into morning, afternoon, evening and overnight.
86°
Best day: Tuesday, August 18
65° · 0.12 in
Worst day: Thursday, August 13
Tap any day below to see morning, afternoon, evening and overnight.
Mon, 1082° / 69°0.07
Morning69°feels 70°
Afternoon80°feels 80°
Evening76°feels 77°
Overnight72°feels 74°
82 °
Portland, Monday, 10 August
Light rain. High 82°, low 69°.
Pressure29.88 inHg
Wind11.1 mph SE
Humidity74%
Visibility6.2 mi
Dew point68°
Tue, 1185° / 69°0.06
Morning71°feels 72°
Afternoon84°feels 90°
Evening77°feels 78°
Overnight72°feels 73°
85 °
Portland, Tuesday, 11 August
Rain. High 85°, low 69°.
Pressure29.80 inHg
Wind5.2 mph N
Humidity72%
Visibility6.2 mi
Dew point72°
Wed, 1280° / 64°0
Morning66°feels 66°
Afternoon80°feels 80°
Evening71°feels 71°
Overnight70°feels 71°
80 °
Portland, Wednesday, 12 August
Partly cloudy. High 80°, low 64°.
Pressure29.88 inHg
Wind7.6 mph E
Humidity59%
Visibility6.2 mi
Dew point63°
Thu, 1365° / 59°0.12
Morning60°feels 60°
Afternoon64°feels 64°
Evening61°feels 61°
Overnight63°feels 63°
65 °
Portland, Thursday, 13 August
Light rain. High 65°, low 59°.
Pressure30.06 inHg
Wind9.5 mph E
Humidity87%
Visibility—
Dew point59°
Fri, 1473° / 55°0
Morning60°feels 60°
Afternoon72°feels 71°
Evening65°feels 66°
Overnight61°feels 61°
73 °
Portland, Friday, 14 August
Overcast. High 73°, low 55°.
Pressure30.15 inHg
Wind11.7 mph E
Humidity58%
Visibility—
Dew point55°
Sat, 1566° / 59°0
Morning63°feels 63°
Afternoon65°feels 65°
Evening64°feels 65°
Overnight64°feels 64°
66 °
Portland, Saturday, 15 August
Light rain. High 66°, low 59°.
Pressure30.18 inHg
Wind12 mph SE
Humidity77%
Visibility—
Dew point58°
Sun, 1681° / 62°0
Morning67°feels 67°
Afternoon77°feels 78°
Evening74°feels 75°
Overnight67°feels 67°
81 °
Portland, Sunday, 16 August
Overcast. High 81°, low 62°.
Pressure30.09 inHg
Wind8.1 mph N
Humidity70%
Visibility—
Dew point65°
Mon, 1780° / 58°0
Morning64°feels 63°
Afternoon77°feels 77°
Evening73°feels 74°
Overnight65°feels 65°
80 °
Portland, Monday, 17 August
Overcast. High 80°, low 58°.
Pressure30.09 inHg
Wind8.3 mph SE
Humidity57%
Visibility—
Dew point58°
Tue, 1886° / 63°0.02
Morning69°feels 71°
Afternoon81°feels 85°
Evening81°feels 86°
Overnight72°feels 73°
86 °
Portland, Tuesday, 18 August
Light rain. High 86°, low 63°.
Pressure29.91 inHg
Wind14 mph S
Humidity71%
Visibility—
Dew point68°
About this forecast
How reliable is a 10-day forecast?
The first 3–5 days are the most reliable, typically within 2–4°. From day six to ten the models show the trend: the direction of change is right more often than the exact numbers.
What does the time-of-day table show?
Temperature in Portland, IA around 8am, 2pm, 8pm and 2am each day — handy for planning a walk, a drive or work outdoors.
How is the best day chosen?
We weigh the daytime high against precipitation: a warm, dry day scores highest.