Darby
United States · North America
Year-round range: 16°F to 85°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 has moderate rainfall — occasional showers but mostly manageable.
Sunshine
Average hours of bright sun per day.
September is one of the sunniest months — great for outdoor plans.
Clear sky
Clear-sky share is the inverse of average cloud cover (100% minus cloud cover). Band labels follow standard meteorological categories; distribution within each band varies by day.
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 73° and nights settle near 48°.
▶Full month-by-month data
| Month | High °F | Low °F | Rain days | Rain (in) | Sun h/day | Humidity |
|---|---|---|---|---|---|---|
| Jan | 33°F | 18°F | 14 | 2.7in | 6.2h | 80.85714285714286% |
| Feb | 37°F | 21°F | 13 | 2.6in | 7.5h | 77% |
| Mar | 45°F | 28°F | 14 | 2.9in | 9.2h | 72.71428571428571% |
| Apr | 50°F | 32°F | 15 | 2.8in | 10.8h | 70.57142857142857% |
| May | 61°F | 39°F | 13 | 2.7in | 12.2h | 67.14285714285714% |
| Jun | 73°F | 48°F | 14 | 3.3in | 12.6h | 61% |
| Jul | 85°F | 57°F | 8 | 1.4in | 14h | 47% |
| Aug | 84°F | 56°F | 7 | 1.3in | 12.7h | 45.142857142857146% |
| Sep | 75°F | 48°F | 7 | 1.7in | 10.8h | 52.42857142857142% |
| Oct | 58°F | 37°F | 11 | 2.3in | 8.6h | 66.85714285714285% |
| Nov | 41°F | 23°F | 12 | 3.0in | 6.7h | 77.99999999999999% |
| Dec | 32°F | 16°F | 14 | 3.3in | 5.7h | 81.99999999999999% |