Weather in Castalia, IA
Castalia, Sunday, 18 October, 19:40
Clear. Feels like 54°. High 66°, low 41°.
Monthly outlook for Castalia, IA: average high 59.2°, average low 44.9°. That is 2.9° above the climate normal for October. Precipitation is expected on 7 days (about 1.1 inches), against a normal of 4 days and 1.4 inches. The warmest day looks like 24 October (69.3°), the coolest 2 November (30.8°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 18 October – 27 October | 62.1° | 55.3° | +3.8° |
| 28 October – 6 November | 54.3° | 50.6° | +2.1° |
| 7 November – 16 November | at normal | 44.9° | — |
October records over 66 years
Climate normals and records are computed from the nearest reference point — West Union (13 mi).
0
Castalia, Monday, 19 October
Overcast. High 62°, low 40°.
0
Castalia, Tuesday, 20 October
Clear. High 63°, low 41°.
0Castalia, Wednesday, 21 October
Clear. High 66°, low 45°.
0
Castalia, Thursday, 22 October
Partly cloudy. High 66°, low 49°.
0Castalia, Friday, 23 October
Overcast. High 64°, low 49°.
0Castalia, Saturday, 24 October
Overcast. High 69°, low 54°.
0Castalia, Sunday, 25 October
Overcast. High 58°, low 47°.
0.17
Castalia, Monday, 26 October
Light rain. High 56°, low 45°.
0.07Castalia, Tuesday, 27 October
Light rain. High 50°, low 46°.
0.24Castalia, Wednesday, 28 October
Light rain. High 56°, low 49°.
0.22Castalia, Thursday, 29 October
Light rain. High 59°, low 53°.
0.09Castalia, Friday, 30 October
Light rain. High 60°, low 44°.
0Castalia, Saturday, 31 October
Partly cloudy. High 57°, low 40°.
0.23Castalia, Sunday, 1 November
Light rain. High 49°, low 46°.
0.08Castalia, Monday, 2 November
Light rain. High 46°, low 31°.
0.06Castalia, Tuesday, 3 November
Climate normal for this date — 60-year average.
0.08Castalia, Wednesday, 4 November
Climate normal for this date — 60-year average.
0.08Castalia, Thursday, 5 November
Climate normal for this date — 60-year average.
0.06Castalia, Friday, 6 November
Climate normal for this date — 60-year average.
0.02
Castalia, Saturday, 7 November
Climate normal for this date — 60-year average.
0.03Castalia, Sunday, 8 November
Climate normal for this date — 60-year average.
0.11
Castalia, Monday, 9 November
Climate normal for this date — 60-year average.
0.1Castalia, Tuesday, 10 November
Climate normal for this date — 60-year average.
0.09Castalia, Wednesday, 11 November
Climate normal for this date — 60-year average.
0.06Castalia, Thursday, 12 November
Climate normal for this date — 60-year average.
0.06Castalia, Friday, 13 November
Climate normal for this date — 60-year average.
0.02Castalia, Saturday, 14 November
Climate normal for this date — 60-year average.
0.06Castalia, Sunday, 15 November
Climate normal for this date — 60-year average.
0.06Castalia, Monday, 16 November
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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