Anamosa
United States · North America
Year-round range: 14°F to 82°F
September
Excellent conditions this month
Your monthly fit score
Comfort fit by month.
Climate details▼
Temperature
Average highs and lows.
September has comfortable temperatures — not too hot, not too cold.
Shaded band = typical daily swing (P10 of night lows to P90 of afternoon peaks) — spans wider than avg high/low lines because it captures day-to-day variation.
| = SepPrecipitation
Monthly precipitation, wet-day risk, and snow signal where relevant.
September is one of the wetter months — pack rain gear.
Sunshine
Average hours of bright sun per day.
September is one of the sunniest months — great for outdoor plans.
Air comfort by month
Humidity and heat feel by month.
September is mostly comfortable — low heat and humidity pressure.
Time-of-day patterns
Typical hourly rhythm for September.
Temperature by hour
Temperature by hour and month
Typical temperature through the day across the year (1996-2025 normals, local time). Shaded cells are nighttime.
In September, afternoons reach about 75° and nights settle near 56°.
▶Full month-by-month data
| Month | High °F | Low °F | Rain days | Rain (in) | Sun h/day | Humidity |
|---|---|---|---|---|---|---|
| Jan | 28°F | 14°F | 7 | 1.6in | 4.2h | 74.42857142857142% |
| Feb | 34°F | 17°F | 6 | 1.7in | 5.1h | 70.42857142857143% |
| Mar | 48°F | 29°F | 9 | 2.7in | 5.8h | 64.42857142857142% |
| Apr | 60°F | 40°F | 11 | 4.3in | 6.4h | 62.285714285714285% |
| May | 71°F | 52°F | 13 | 4.7in | 7.3h | 65.14285714285714% |
| Jun | 80°F | 62°F | 12 | 5.0in | 8.6h | 68% |
| Jul | 82°F | 66°F | 9 | 3.8in | 9.6h | 72.14285714285714% |
| Aug | 81°F | 64°F | 10 | 3.7in | 9h | 72.28571428571428% |
| Sep | 75°F | 57°F | 8 | 3.6in | 8.5h | 66.85714285714285% |
| Oct | 63°F | 46°F | 8 | 2.8in | 6.4h | 63.57142857142857% |
| Nov | 48°F | 33°F | 7 | 2.3in | 5h | 67.71428571428571% |
| Dec | 34°F | 21°F | 7 | 1.9in | 3.9h | 74% |
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Planning notes
Expect some rain.