10-day forecast for Johnston, IA: 57° to 98°, with precipitation expected on 3 days. The table below breaks each day into morning, afternoon, evening and overnight.
98°
Best day: Monday, August 17
82° · 0.22 in
Worst day: Thursday, August 13
Tap any day below to see morning, afternoon, evening and overnight.
Sun, 0996° / 70°0.06
Morning70°feels 71°
Afternoon94°feels 95°
Evening88°feels 92°
Overnight79°feels 79°
96 °
Johnston, Sunday, 9 August
Rain. High 96°, low 70°.
Pressure29.77 inHg
Wind12.8 mph SW
Humidity40%
Visibility6.2 mi
Dew point64°
Mon, 1097° / 68°0.01
Morning72°feels 73°
Afternoon95°feels 96°
Evening84°feels 87°
Overnight72°feels 72°
97 °
Johnston, Monday, 10 August
Light rain. High 97°, low 68°.
Pressure29.85 inHg
Wind5.8 mph N
Humidity47%
Visibility6.2 mi
Dew point64°
Tue, 1196° / 70°0.03
Morning71°feels 71°
Afternoon95°feels 98°
Evening84°feels 90°
Overnight73°feels 73°
96 °
Johnston, Tuesday, 11 August
Light rain. High 96°, low 70°.
Pressure29.74 inHg
Wind13.1 mph W
Humidity38%
Visibility6.2 mi
Dew point64°
Wed, 1292° / 72°0.25
Morning74°feels 76°
Afternoon91°feels 93°
Evening83°feels 87°
Overnight76°feels 77°
92 °
Johnston, Wednesday, 12 August
Rain. High 92°, low 72°.
Pressure29.85 inHg
Wind11.5 mph SE
Humidity48%
Visibility6.2 mi
Dew point65°
Thu, 1382° / 65°0.22
Morning70°feels 71°
Afternoon77°feels 77°
Evening75°feels 75°
Overnight65°feels 65°
82 °
Johnston, Thursday, 13 August
Light rain. High 82°, low 65°.
Pressure29.94 inHg
Wind14.2 mph NE
Humidity65%
Visibility—
Dew point63°
Fri, 1482° / 57°0
Morning64°feels 63°
Afternoon81°feels 80°
Evening75°feels 75°
Overnight64°feels 63°
82 °
Johnston, Friday, 14 August
Clear. High 82°, low 57°.
Pressure30.18 inHg
Wind8.9 mph E
Humidity30%
Visibility—
Dew point44°
Sat, 1583° / 59°0
Morning65°feels 65°
Afternoon80°feels 80°
Evening78°feels 78°
Overnight71°feels 71°
83 °
Johnston, Saturday, 15 August
Overcast. High 83°, low 59°.
Pressure30.21 inHg
Wind13.7 mph S
Humidity42%
Visibility—
Dew point53°
Sun, 1685° / 66°0
Morning71°feels 72°
Afternoon83°feels 87°
Evening84°feels 87°
Overnight73°feels 74°
85 °
Johnston, Sunday, 16 August
Overcast. High 85°, low 66°.
Pressure30.03 inHg
Wind11.6 mph SE
Humidity63%
Visibility—
Dew point67°
Mon, 1798° / 70°0
Morning76°feels 79°
Afternoon91°feels 97°
Evening85°feels 89°
Overnight74°feels 76°
98 °
Johnston, Monday, 17 August
Overcast. High 98°, low 70°.
Pressure29.94 inHg
Wind15.1 mph NE
Humidity49%
Visibility—
Dew point67°
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 Johnston, 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.