Summer rainJuly to September 2026Philadelphia International Airport
Philadelphia's airport got 21.08 inches of rain from July to September 2026, the third most since 1940
Philadelphia International Airport recorded 21.08 inches of rain from July through September 2026, the third most since 1940 and 8 inches above average.
- Rain, July to September
- 21.08inches, preliminary
- Rank since 1940
- Thirdof 87 years
- Above average
- 8.01inches over 13.07
- Days with 1 inch or more
- 8average 3.87
Rain fell on 32 of the 92 days, and the total finished 8.01 inches above the average
Philadelphia International Airport recorded 21.08 inches of rain from July 1 through September 30, 2026. That is the third-highest total for those three months in the station's record, which starts in July 1940, behind 32.29 inches in 2011 and 22.41 inches in 2013. It is 8.01 inches above the 13.07 inches the airport averaged for the same months from 1991 through 2020. The figures are this site's totals from NOAA's daily records, as served by the Applied Climate Information System (ACIS), and the station is missing no days in the period.
Since 1940Four of 87 years topped 20 inches from July through September, and 2026 is one of them
Four of the 87 years on record topped 20 inches from July through September: 1971, 2011, 2013 and 2026. The years 2010 through 2019 averaged 15.02 inches for the three months, against 11.26 inches from 1941 through 1970.
Only 2011 and 2013 were wetter than 2026 at the airport
Month by monthEach of the three months ran more than 2 inches above its average
July brought 7.03 inches, August 7.44 and September 6.61. None of the three ranked among the five wettest of its own month at the airport. Each came in more than 2 inches above its 1991 to 2020 average, and 2026 is the only year in the record when all three months reached 6 inches.
July, August and September each reached 6 inches at the airport
| Month | Airport 2026 | 2026 1991-2020 average | Average | Days 1 in.+ | Wettest day | Norristown 2026 |
|---|---|---|---|---|---|---|
| July | 7.03 | 4.38 | 2 | 2.70 | 4.21 | |
| August | 7.44 | 4.29 | 3 | 2.33 | 8.59 | |
| September | 6.61 | 4.40 | 3 | 1.58 | 6.97 | |
| July to September | 21.08 | 13.07 | 8 | 19.77 |
The airport had 8 days with an inch or more of rain, against an average of 3.87 for the same months from 1991 through 2020. That ties 1967 for the third most in the record, after 10 in 2011 and 9 in 2013. Two of those days brought more than 2 inches: 2.70 inches on July 9 and 2.33 inches on August 27. Measurable rain, a hundredth of an inch or more, fell on 32 of the 92 days.
The ten wettest July-to-September stretches at the airport, with their days of an inch or more
| Rank | Year | Inches | Bar of inches | Days 1 in.+ | Days shown as dots |
|---|---|---|---|---|---|
| 1 | 2011 | 32.29 | 10 | ||
| 2 | 2013 | 22.41 | 9 | ||
| 3 | 2026 | 21.08 | 8 | ||
| 4 | 1971 | 20.28 | 6 | ||
| 5 | 1999 | 19.61 | 7 | ||
| 6 | 1989 | 18.39 | 7 | ||
| 7 | 2020 | 18.30 | 5 | ||
| 8 | 2021 | 17.51 | 6 | ||
| 9 | 1960 | 17.49 | 5 | ||
| 10 | 1996 | 17.41 | 5 |
Closer to ConshohockenNorristown recorded 19.77 inches, sixth among its 54 complete years
NOAA's Cooperative Network station in Norristown, USC00366370, sits just up the Schuylkill from Conshohocken. Its precipitation record in ACIS starts in May 1948 and has gaps. It recorded 19.77 inches from July through September 2026 with no days missing, the sixth most among the 54 years since 1948 when the station has every day of those three months.
Norristown's 19.77 inches ranks sixth among the years it reported in full
The two stations split the summer differently. Norristown had 4.21 inches in July, well under the airport's 7.03, and 8.59 inches in August, more than the airport's 7.44. Norristown counted 9 days with an inch or more, the third most among its complete years after 10 in 2011 and 10 in 2018.
Norristown had 4.21 inches in July and 8.59 in August, against the airport's 7.03 and 7.44
ACIS lists the Norristown readings as taken at 7 a.m., so each of its days covers the 24 hours ending that morning. A storm on a summer evening lands on the next day's line, which is why the two stations' heavy-rain dates often differ by one.
What this means for a roofCheck the valleys, gutters and drains in this fall's inspection
The National Roofing Contractors Association recommends inspecting a roof at least twice a year, in spring and fall, and says to pay special attention to valleys, gutters and roof drains, where debris collects and slows drainage. A valley is the channel where two roof slopes meet. This fall's inspection is the first chance to check those spots after the wet summer.
Indoors, a stain on a top-floor ceiling or on the attic side of the roof deck after one of the heavy days is worth a closer look from the attic or by a roofer. The roof inspection checklist lists what to check.
If water came in, the Pennsylvania Insurance Department's natural disaster guide tells homeowners to photograph or film the damage before cleaning up, to make only the repairs needed to prevent more damage, and to hold off on permanent repairs until the insurer approves them. The same guide suggests asking the insurer whether damage from floods and wind is covered under the policy, since that decides what a claim can include. Whether a given leak is covered depends on the policy wording, so ask the insurer or an agent. The storm damage and insurance claims guide covers the claim process and its deadlines.
CaveatsThe July to September 2026 figures are preliminary and can still change
The National Weather Service says daily observations are preliminary until NOAA's National Centers for Environmental Information finishes quality control, three or more months after they are taken. The July to September 2026 figures can still change.
Norristown's July total, 2.82 inches below the airport's, shows how far two stations in the same region can differ in one month. Neither station measures rain on a particular street in Conshohocken or West Conshohocken.
The 1991 to 2020 averages here are this site's averages of the airport's own monthly totals, not NOAA's published climate normals. Norristown's comparison uses only the years when it reported every day from July through September, which leaves out many years and makes its ranking less certain than the airport's. The weather guide covers the area's rain over the full year, along with freeze-thaw days, wind and hail.
Data: airport yearly totals, ten wettest years, monthly table, daily readings, Norristown yearly totals (CSV).