Weather in Castalia, IA
Castalia, Saturday, 8 August, 23:10
Mostly clear. Feels like 64°. High 79°, low 58°.
Monthly outlook for Castalia, IA: average high 75.1°, average low 59.6°. That is 1.5° below the climate normal for August. Precipitation is expected on 5 days (about 1.6 inches), against a normal of 5 days and 2.2 inches. The warmest day looks like 18 August (84.2°), the coolest 21 August (51.6°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 8 August – 17 August | 75.9° | 78° | -1.1° |
| 18 August – 27 August | 73.8° | 77.7° | -2.2° |
| 28 August – 6 September | at normal | 76.3° | — |
August records over 66 years
Climate normals and records are computed from the nearest reference point — West Union (13 mi).
1.09
Castalia, Sunday, 9 August
Heavy rain. High 76°, low 64°.
0.04Castalia, Monday, 10 August
Light rain. High 83°, low 68°.
0.05Castalia, Tuesday, 11 August
Rain. High 83°, low 69°.
0
Castalia, Wednesday, 12 August
Overcast. High 79°, low 65°.
0Castalia, Thursday, 13 August
Overcast. High 67°, low 58°.
0
Castalia, Friday, 14 August
Partly cloudy. High 76°, low 56°.
0Castalia, Saturday, 15 August
Overcast. High 64°, low 57°.
0Castalia, Sunday, 16 August
Overcast. High 71°, low 55°.
0.01Castalia, Monday, 17 August
Light rain. High 81°, low 60°.
0.16Castalia, Tuesday, 18 August
Light rain. High 84°, low 65°.
0.08Castalia, Wednesday, 19 August
Light rain. High 73°, low 59°.
0.02Castalia, Thursday, 20 August
Light rain. High 65°, low 52°.
0
Castalia, Friday, 21 August
Mostly clear. High 72°, low 52°.
0.12Castalia, Saturday, 22 August
Light rain. High 74°, low 55°.
0
Castalia, Sunday, 23 August
Clear. High 74°, low 59°.
0.13Castalia, Monday, 24 August
Climate normal for this date — 60-year average.
0.12Castalia, Tuesday, 25 August
Climate normal for this date — 60-year average.
0.11
Castalia, Wednesday, 26 August
Climate normal for this date — 60-year average.
0.17Castalia, Thursday, 27 August
Climate normal for this date — 60-year average.
0.2Castalia, Friday, 28 August
Climate normal for this date — 60-year average.
0.13Castalia, Saturday, 29 August
Climate normal for this date — 60-year average.
0.15Castalia, Sunday, 30 August
Climate normal for this date — 60-year average.
0.04Castalia, Monday, 31 August
Climate normal for this date — 60-year average.
0.07Castalia, Tuesday, 1 September
Climate normal for this date — 60-year average.
0.1Castalia, Wednesday, 2 September
Climate normal for this date — 60-year average.
0.11Castalia, Thursday, 3 September
Climate normal for this date — 60-year average.
0.09Castalia, Friday, 4 September
Climate normal for this date — 60-year average.
0.09Castalia, Saturday, 5 September
Climate normal for this date — 60-year average.
0.11Castalia, Sunday, 6 September
Climate normal for this date — 60-year average.
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 Castalia, IA 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 Castalia, IA 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.
Sun and moon today
Weather history
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