Gettysburg, PA weather in September
In September, Gettysburg sees highs around 77°F and lows around 56°F: mild, with some rain. There are about 10 days with rain. Good for outdoor plans.
- Normal high
- 77°F
- Normal low
- 56°F
- Wet days
- 10
- 5.2 in total
- Muggy days
- 5
- dew point 65°F+
How September changes from start to finish
| September 1 | September 30 | |
|---|---|---|
| Normal high | 82°F | 71°F |
| Normal low | 60°F | 50°F |
| Chance of a wet day | 29% | 32% |
| Sunrise / sunset | 6:37 am / 7:40 pm | 7:04 am / 6:53 pm |
| Daylight | 13.1 h | 11.8 h |
Chance of a wet day: average for the first and last 7 days of the month. Times are local clock time (Eastern Time).
A typical September day
- 6 am58°Fdew point 55°F
- 9 am67°Fdew point 58°F
- Noon74°Fdew point 57°F
- 3 pm77°Fdew point 57°F
- 6 pm72°Fdew point 57°F
- 9 pm65°Fdew point 58°F
NOAA hourly normals (local standard time) from Martinsburg E Wv Rgnl Airport (50 mi away); average wind 5 mph; clear or few clouds in 56% of daytime hours, mostly cloudy or overcast in 35%.
What kind of days to expect
- Comfortable dayshigh 65-80°F and dew point under 60°F13 of 30
- Hot dayshigh 90°F or more2 of 30
- Muggy daysdaily mean dew point 65°F or more5 of 30
- Wet daysat least 0.01 in of rain or melted snow10 of 30
- Notable rainat least 0.10 in6 of 30
- Freezing nightslow 32°F or below0 of 30
- Snow on the groundsnow depth 1 in or more0 of 30
Average days per September, counted from daily records for each year 1991-2020.
Rain in September
Normal precipitation is 5.2 in; a dry September brings about 2.5 in and a wet one about 7.9 in (25th and 75th percentiles). About 3 days bring half an inch or more, and about 2 an inch or more.
How September varies from year to year
- Warmest September, 1991-20202005: average high 82°F
- Coolest September1992: average high 72°F
- Wettest September2018: 11.5 in
- Driest September2005: 0.3 in
- Highest reading96°F (September 3, 2010)
- Lowest reading33°F (September 28, 1991)
From the station's daily records with NOAA quality flags removed; most recent date shown when a reading repeats.
September compared with August and October
| August | September | October | |
|---|---|---|---|
| Normal high | 84°F | 77°F | 65°F |
| Normal low | 63°F | 56°F | 44°F |
| Wet days | 9 | 10 | 9 |
| Comfortable days | 5 | 13 | 13 |
| Daylight | 13.7 h | 12.4 h | 11.1 h |
Highs change by -7°F from August and -12°F into October.
How Gettysburg ranks in September
- Normal high246th warmest of 378 cities; 3rd of 4 in Pennsylvania
- Wet days288th driest of 378
- Comfortable days129th most of 342
What to pack for Gettysburg in September
- A rain jacket or umbrella – rain on about 10 days
Heating and cooling
September has 72 heating degree days and 109 cooling degree days (base 65°F), 3% of the year's total heating and cooling demand.
Questions
How hot is Gettysburg in September?
The normal high is 77°F and the normal low is 56°F. From 1991 to 2020 the hottest September reading was 96°F (most recently on September 3, 2010).
Does it rain a lot in Gettysburg in September?
About 10 days in September have at least 0.01 in of precipitation, and the normal total is 5.2 in. The wettest September in 1991-2020 was in 2018 (11.5 in); the driest was in 2005 (0.3 in).
Is September a good time to visit Gettysburg?
September ranks 2nd of 12 months on our comfort score for Gettysburg (64 out of 100). It has about 13 comfortable days and about 2 days at 90°F or hotter. The best month is May.
Where the numbers come from
- Temperature, rain, snowfall, snow depth and frost dates: Biglerville (USC00360656), 7.3 mi N of the city center, 720 ft (183 ft higher than the city). NOAA normals and daily records, 1991-2020.
- Humidity and wind by hour and cloud cover: Martinsburg E Wv Rgnl Airport (USW00013734), 50 mi SW of the city center, 534 ft . NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: Capital City Airport (725118-14751), 33 mi NE of the city center, 335 ft (202 ft lower than the city). Hourly observations, 1991-2020.