United States · 1991–2020

Best time to visit
Pottstown.

September leads for comfortable weather in Pottstown: typically 24.9°C by day, 13.4°C at night, with 121 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortSeptember

Typical high24.9°C

Typical low13.4°C

Rain in September121 mm

Comfort

September

September · May · June

78climate match

Beach

July

July · August · June

70climate match

Outdoors

May

May · October · April

73climate match

The weakest month is January, scoring 5 against September’s 78 — days reach only 3.6°C, 20° 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

53.6° / -5.3°

Feb

55.3° / -4.5°

Mar

1510.5° / -0.4°

Apr

4617.2° / 5°

May

7322.5° / 10.6°

Jun

7327° / 15.7°

Jul

5829.8° / 18.4°

Aug

6328.5° / 17.5°

Sep

7824.9° / 13.4°

Oct

5318.3° / 7.1°

Nov

2812.4° / 1.6°

Dec

56.4° / -2.6°

Monthly climate evidence for Pottstown — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	3.6°C	-5.3°C	70 mm	7.7	9 h 36	5	Good coverage
February	5.3°C	-4.5°C	66 mm	7.7	10 h 36	5	Good coverage
March	10.5°C	-0.4°C	93 mm	8.4	11 h 49	15	Good coverage
April	17.2°C	5°C	97 mm	8.8	13 h 13	46	Good coverage
May	22.5°C	10.6°C	97 mm	9.5	14 h 23	73	Good coverage
June	27°C	15.7°C	107 mm	9.2	15 h 01	73	Good coverage
July	29.8°C	18.4°C	119 mm	8.7	14 h 46	58	Good coverage
August	28.5°C	17.5°C	124 mm	8.5	13 h 46	63	Good coverage
September	24.9°C	13.4°C	121 mm	7.6	12 h 24	78	Good coverage
October	18.3°C	7.1°C	104 mm	8	11 h 04	53	Good coverage
November	12.4°C	1.6°C	76 mm	7	9 h 53	28	Good coverage
December	6.4°C	-2.6°C	98 mm	8.5	9 h 19	5	Good coverage

Records at HERITAGE FLD AP, 1999–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	21.7°C6 Jan 2007	-21.6°C31 Jan 2019	57 mm9 Jan 2024	148 mm2024 · driest 13 mm in 2025	27
February	25.6°C21 Feb 2018	-18.8°C1 Feb 2019	65 mm13 Feb 2008	151 mm2008 · driest 13 mm in 2002	27
March	28.9°C29 Mar 2025	-17.7°C6 Mar 2015	69 mm21 Mar 2000	170 mm2000 · driest 24 mm in 2006	28
April	33.3°C27 Apr 2009	-6.0°C6 Apr 2016	123 mm30 Apr 2014	232 mm2014 · driest 35 mm in 2021	28
May	34.4°C31 May 2011	-1.1°C4 May 2002	56 mm13 May 2006	187 mm2025 · driest 3 mm in 2023	28
June	36.7°C22 Jun 2024	4.4°C1 Jun 2020	99 mm20 Jun 2003	294 mm2003 · driest 18 mm in 1999	28
July	40.6°C22 Jul 2011	8.9°C3 Jul 2001	109 mm12 Jul 2004	310 mm2004 · driest 0 mm in 1999	28
August	38.3°C9 Aug 2001	7.2°C31 Aug 2025	129 mm4 Aug 2020	274 mm2011 · driest 10 mm in 2025	27
September	36.7°C1 Sep 2010	1.1°C21 Sep 2020	137 mm1 Sep 2021	288 mm2011 · driest 13 mm in 2007	27
October	32.8°C2 Oct 2019	-3.8°C19 Oct 2015	121 mm8 Oct 2005	242 mm2005 · driest 1 mm in 2024	27
November	28.3°C6 Nov 2024	-11.6°C23 Nov 2018	57 mm30 Nov 2020	200 mm2018 · driest 15 mm in 2025	27
December	22.8°C1 Dec 2006	-17.8°C14 Dec 2005	58 mm27 Dec 2023	201 mm2023 · driest 21 mm in 2025	27

Typical days per month at HERITAGE FLD AP, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)
January	0	0	26	3
February	0	0	24	2
March	<1	0	18	4
April	3	<1	4	3
May	11	3	<1	3
June	22	8	0	3
July	29	16	0	4
August	27	11	0	4
September	16	3	0	4
October	3	<1	2	4
November	<1	0	13	3
December	0	0	23	4

How often, not how much — every day in HERITAGE FLD AP’s record sorted by what it was actually like, rather than averaged
Month	Warm & dry days	Wet days	Washouts	Week with 3+ wet days	Daytime mean has ranged
January	<1%	25%	8%	23%	1.0–6.9°C
February	<1%	27%	7%	30%	1.5–8.4°C
March	7%	27%	11%	31%	7.5–14.4°C
April	26%	29%	9%	35%	15.0–19.2°C
May	52%	31%	11%	39%	20.3–24.8°C
June	69%	30%	11%	34%	25.4–29.2°C
July	72%	28%	11%	34%	27.8–31.8°C
August	73%	27%	11%	30%	26.7–30.0°C
September	69%	26%	11%	29%	23.5–27.0°C
October	32%	25%	12%	26%	16.7–20.1°C
November	7%	22%	8%	21%	9.9–14.9°C
December	<1%	27%	11%	31%	3.8–9.6°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.

2000Each stripe is one year’s mean temperature against the 26-year average. Warmest: 2010. Coolest: 2014.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 5207069
NOAA station: USW00054782 · HERITAGE FLD AP
Station distance: 8.1 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 21 usable years
Daylight: Calculated from latitude 40.25°, 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.

These places read the same station, so their numbers are identical — distance from HERITAGE FLD AP is what differs

Limerick→Sanatoga→Gilbertsville→Royersford→Boyertown→Stowe→

Or put two places side by side: Pottstown vs Limerick

Best time to visitPottstown.

September

July

May

The whole year,without the guesswork.

Nearby, measured,and named.

Best time to visit
Pottstown.

The whole year,
without the guesswork.

Nearby, measured,
and named.