10-day forecast for Castalia, IA: 58° to 83°, with precipitation expected on 3 days. The table below breaks each day into morning, afternoon, evening and overnight.
82°
Best day: Wednesday, August 12
83° · 0.37 in
Worst day: Sunday, August 9
Tap any day below to see morning, afternoon, evening and overnight.
Mon, 1082° / 67°0.06
Morning71°feels 72°
Afternoon80°feels 80°
Evening75°feels 76°
Overnight70°feels 71°
82 °
Castalia, Monday, 10 August
Rain. High 82°, low 67°.
Pressure29.94 inHg
Wind2.9 mph N
Humidity92%
Visibility3.8 mi
Dew point71°
Tue, 1181° / 66°0.02
Morning69°feels 70°
Afternoon78°feels 79°
Evening75°feels 76°
Overnight68°feels 69°
81 °
Castalia, Tuesday, 11 August
Light rain. High 81°, low 66°.
Pressure29.83 inHg
Wind9.9 mph SE
Humidity92%
Visibility6.2 mi
Dew point68°
Wed, 1282° / 68°0
Morning70°feels 71°
Afternoon82°feels 83°
Evening71°feels 72°
Overnight68°feels 69°
82 °
Castalia, Wednesday, 12 August
Partly cloudy. High 82°, low 68°.
Pressure29.88 inHg
Wind6.3 mph NE
Humidity65%
Visibility6.2 mi
Dew point67°
Thu, 1372° / 61°0.02
Morning64°feels 64°
Afternoon69°feels 70°
Evening68°feels 69°
Overnight65°feels 64°
72 °
Castalia, Thursday, 13 August
Light rain. High 72°, low 61°.
Pressure29.97 inHg
Wind7.9 mph SE
Humidity79%
Visibility—
Dew point61°
Fri, 1473° / 58°0
Morning62°feels 62°
Afternoon71°feels 71°
Evening69°feels 69°
Overnight64°feels 64°
73 °
Castalia, Friday, 14 August
Overcast. High 73°, low 58°.
Pressure30.15 inHg
Wind12.8 mph E
Humidity63%
Visibility—
Dew point57°
Sat, 1568° / 58°0.13
Morning61°feels 61°
Afternoon66°feels 67°
Evening68°feels 69°
Overnight66°feels 67°
68 °
Castalia, Saturday, 15 August
Light rain. High 68°, low 58°.
Pressure30.15 inHg
Wind14.3 mph E
Humidity90%
Visibility—
Dew point62°
Sun, 1670° / 61°0
Morning64°feels 65°
Afternoon68°feels 69°
Evening69°feels 69°
Overnight61°feels 62°
70 °
Castalia, Sunday, 16 August
Light rain. High 70°, low 61°.
Pressure30.09 inHg
Wind12.7 mph NW
Humidity83%
Visibility—
Dew point62°
Mon, 1777° / 58°0
Morning64°feels 64°
Afternoon75°feels 75°
Evening71°feels 72°
Overnight64°feels 64°
77 °
Castalia, Monday, 17 August
Overcast. High 77°, low 58°.
Pressure30.09 inHg
Wind7.9 mph S
Humidity64%
Visibility—
Dew point60°
Tue, 1878° / 62°0.02
Morning66°feels 66°
Afternoon76°feels 77°
Evening76°feels 77°
Overnight71°feels 72°
78 °
Castalia, Tuesday, 18 August
Light rain. High 78°, low 62°.
Pressure29.83 inHg
Wind21.6 mph SW
Humidity71%
Visibility—
Dew point64°
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 Castalia, 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.