September
September · June · August
78climate match
United States · 1991–2020
Best time to visit
Duncansville.
September leads for comfortable weather in Duncansville: typically 23.9°C by day, 11.6°C at night, with 112 mm of rain. Based on measured 1991–2020 NOAA station history.
Best comfortSeptember
Typical high23.9°C
Typical low11.6°C
Rain in September112 mm
July
July · August · June
67climate match
May
May · September · October
71climate match
The weakest month is January, scoring 5 against September’s 78 — days reach only 1.8°C, 22° below the 24°C the score treats as ideal.
Month by month
The whole year,
without the guesswork.
The bars show the comfort score. Day and night temperatures come from daily observed highs and lows; rain is the historical monthly estimate.
Jan
51.8° / -6.8°
Feb
53.4° / -6.3°
Mar
78.8° / -2.1°
Apr
4016.2° / 3.5°
May
6521.8° / 9.2°
Jun
7525.8° / 14°
Jul
6828.4° / 16.3°
Aug
7327.6° / 15.5°
Sep
7823.9° / 11.6°
Oct
4416.7° / 5.7°
Nov
2010.6° / 0.2°
Dec
54.2° / -3.8°
| Month | Day | Night | Rain | Wet days | Daylight | Comfort | Coverage |
|---|---|---|---|---|---|---|---|
| January | 1.8°C | -6.8°C | 69 mm | 9.5 | 9 h 35 | 5 | Good coverage |
| February | 3.4°C | -6.3°C | 64 mm | 8.3 | 10 h 36 | 5 | Good coverage |
| March | 8.8°C | -2.1°C | 83 mm | 9.1 | 11 h 49 | 7 | Good coverage |
| April | 16.2°C | 3.5°C | 86 mm | 10.3 | 13 h 13 | 40 | Good coverage |
| May | 21.8°C | 9.2°C | 104 mm | 11.8 | 14 h 24 | 65 | Good coverage |
| June | 25.8°C | 14°C | 104 mm | 11.1 | 15 h 02 | 75 | Good coverage |
| July | 28.4°C | 16.3°C | 98 mm | 10 | 14 h 47 | 68 | Good coverage |
| August | 27.6°C | 15.5°C | 101 mm | 9 | 13 h 46 | 73 | Good coverage |
| September | 23.9°C | 11.6°C | 112 mm | 8.3 | 12 h 25 | 78 | Good coverage |
| October | 16.7°C | 5.7°C | 98 mm | 9.9 | 11 h 03 | 44 | Good coverage |
| November | 10.6°C | 0.2°C | 70 mm | 8.3 | 9 h 53 | 20 | Good coverage |
| December | 4.2°C | -3.8°C | 89 mm | 9.3 | 9 h 18 | 5 | Good coverage |
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 20.6°C12 Jan 2017 | -22.8°C7 Jan 2014 | 53 mm25 Jan 2010 | 135 mm2005 · driest 26 mm in 2011 | 25 |
| February | 26.1°C20 Feb 2018 | -24.4°C24 Feb 2015 | 34 mm6 Feb 2004 | 162 mm2018 · driest 24 mm in 2009 | 25 |
| March | 29.4°C23 Mar 2026 | -17.8°C6 Mar 2015 | 48 mm14 Mar 2010 | 145 mm2011 · driest 27 mm in 2006 | 25 |
| April | 32.8°C28 Apr 2009 | -7.8°C4 Apr 2013 | 60 mm3 Apr 2024 | 209 mm2011 · driest 35 mm in 2016 | 25 |
| May | 32.8°C31 May 2011 | -2.8°C9 May 2020 | 56 mm22 May 2025 | 227 mm2025 · driest 23 mm in 2023 | 25 |
| June | 35.6°C23 Jun 2024 | 2.8°C1 Jun 2009 | 79 mm22 Jun 2022 | 211 mm2015 · driest 16 mm in 2005 | 26 |
| July | 38.9°C23 Jul 2011 | 6.7°C3 Jul 2007 | 54 mm19 Jul 2026 | 246 mm2018 · driest 27 mm in 2011 | 26 |
| August | 35.6°C3 Aug 2002 | 5.0°C31 Aug 2025 | 89 mm21 Aug 2022 | 207 mm2003 · driest 26 mm in 2015 | 25 |
| September | 33.9°C8 Sep 2015 | 0.0°C22 Sep 2020 | 140 mm1 Sep 2021 | 359 mm2018 · driest 24 mm in 2005 | 25 |
| October | 32.2°C1 Oct 2019 | -4.4°C9 Oct 2001 | 73 mm30 Oct 2012 | 140 mm2006 · driest 36 mm in 2022 | 25 |
| November | 27.8°C1 Nov 2024 | -12.8°C22 Nov 2014 | 78 mm11 Nov 2022 | 135 mm2018 · driest 16 mm in 2012 | 25 |
| December | 23.3°C6 Dec 2001 | -19.4°C24 Dec 2022 | 82 mm1 Dec 2010 | 143 mm2018 · driest 34 mm in 2017 | 25 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) | Snow days |
|---|---|---|---|---|---|
| January | 0 | 0 | 27 | 2 | 8 |
| February | <1 | 0 | 25 | 2 | 7 |
| March | <1 | 0 | 21 | 3 | 4 |
| April | 4 | <1 | 8 | 3 | <1 |
| May | 11 | 2 | <1 | 3 | 0 |
| June | 19 | 5 | 0 | 3 | 0 |
| July | 27 | 12 | 0 | 4 | 0 |
| August | 26 | 8 | 0 | 3 | 0 |
| September | 13 | 3 | <1 | 3 | 0 |
| October | 3 | <1 | 4 | 3 | <1 |
| November | <1 | 0 | 16 | 2 | 1 |
| December | 0 | 0 | 26 | 4 | 5 |
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | 0% | 30% | 7% | 36% | -1.6–5.4°C |
| February | 1% | 29% | 8% | 35% | -0.5–8.2°C |
| March | 6% | 30% | 9% | 38% | 5.5–14.0°C |
| April | 23% | 35% | 11% | 48% | 14.1–18.9°C |
| May | 44% | 38% | 11% | 54% | 19.5–24.5°C |
| June | 61% | 37% | 11% | 48% | 24.7–27.3°C |
| July | 67% | 33% | 11% | 41% | 26.5–30.6°C |
| August | 69% | 30% | 11% | 35% | 25.9–28.6°C |
| September | 63% | 29% | 10% | 35% | 22.6–25.6°C |
| October | 26% | 29% | 10% | 31% | 15.0–19.4°C |
| November | 6% | 26% | 7% | 31% | 7.9–13.5°C |
| December | <1% | 29% | 11% | 35% | 1.6–8.1°C |
A warm and dry day reaches 20°C with under 1 mm of rain; a wet day gets 1 mm or more; a washout gets 10 mm or more. The week column is the share of seven-day stretches in that month, across the station’s whole daily record, that contained three or more wet days — the odds a week-long trip is rained on repeatedly, counted rather than modelled. The last column is the 10th to 90th percentile of that month’s daytime average across individual years: a narrow band means the average is what you will get, a wide one means the average is a midpoint between years that felt quite different.
The evidence behind this page
Nearby, measured,
and named.
- Place identity
- GeoNames 5187508
- NOAA station
- USC00360132 · ALTOONA 7 SW
- Station distance
- 1.3 km from the place centre
- Climate period
- 1991–2020
- Minimum month coverage
- 19 usable years
- Daylight
- Calculated from latitude 40.42°, mid-month, sunrise to sunset including refraction. Not a station measurement.
- Important limit
- Historical climate is not a forecast. Nearby stations can miss mountains, coasts, and local microclimates.