Norristown weather in August: Norristown, Pennsylvania: normal highs, lows, rain and records for August
Norristown in August has a normal high of 87°F and a normal low of 65°F, a daily mean of 76°F, falling from 88°F on the 1st to 85°F by the 31st. Measurable precipitation falls on 10 days in a normal August, 4.98 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 30°C and low of 18°C, 126 mm of precipitation in August.
- NOAA stationNorristown
- Station IDUSC00366370
- Location40.11°N 75.34°W
- Elevation62 ft (19 m)
- From the centerunder 1 mile
- Population36,075
- Jan 42° 23°
- Feb 44° 25°
- Mar 52° 32°
- Apr 65° 42°
- May 75° 52°
- Jun 84° 62°
- Jul 89° 67°
- Aug 87° 65°
- Sep 80° 58°
- Oct 68° 45°
- Nov 57° 35°
- Dec 46° 28°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Norristown in August?
The normal high is 87°F and the normal low 65°F, for a daily mean of 75.9°F. August is 1.8°F cooler than July and 7.1°F warmer than September. August is the 2nd warmest month of the year in Norristown and the wettest. Across the month the normal high falls 3°F, from 88°F on August 1 to 85°F on August 31. From one year to the next August's mean temperature typically moves about 2.4°F either way (NOAA's standard deviation), so roughly two Augusts in three average between 74°F and 78°F.
Bars above: each day's normal high to low. Columns below: the chance of 0.01 inch or more of precipitation that day, on a scale of 0 to 100% (highest 37%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| August 1 | 88°F | 66°F | 37% | 25% |
| August 8 | 87°F | 66°F | 36% | 24% |
| August 15 | 87°F | 66°F | 34% | 23% |
| August 22 | 86°F | 65°F | 32% | 21% |
| August 31 | 85°F | 63°F | 29% | 20% |
Every day of August: normal high, low and chance of precipitation (warmest afternoon August 1, coldest night August 31)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| August 1 | 88°F | 66°F | 37% | 25% | 14 h 20 min |
| August 2 | 88°F | 66°F | 37% | 25% | 14 h 20 min |
| August 3 | 88°F | 66°F | 37% | 25% | 14 h 10 min |
| August 4 | 88°F | 66°F | 37% | 25% | 14 h 10 min |
| August 5 | 88°F | 66°F | 36% | 25% | 14 h 10 min |
| August 6 | 88°F | 66°F | 36% | 25% | 14 h 10 min |
| August 7 | 87°F | 66°F | 36% | 24% | 14 h 10 min |
| August 8 | 87°F | 66°F | 36% | 24% | 14 h |
| August 9 | 87°F | 66°F | 36% | 24% | 14 h |
| August 10 | 87°F | 66°F | 36% | 24% | 14 h |
| August 11 | 87°F | 66°F | 35% | 24% | 14 h |
| August 12 | 87°F | 66°F | 35% | 23% | 14 h |
| August 13 | 87°F | 66°F | 35% | 23% | 13 h 50 min |
| August 14 | 87°F | 66°F | 34% | 23% | 13 h 50 min |
| August 15 | 87°F | 66°F | 34% | 23% | 13 h 50 min |
| August 16 | 87°F | 66°F | 34% | 22% | 13 h 50 min |
| August 17 | 87°F | 65°F | 34% | 22% | 13 h 40 min |
| August 18 | 86°F | 65°F | 33% | 22% | 13 h 40 min |
| August 19 | 86°F | 65°F | 33% | 22% | 13 h 40 min |
| August 20 | 86°F | 65°F | 33% | 21% | 13 h 40 min |
| August 21 | 86°F | 65°F | 32% | 21% | 13 h 30 min |
| August 22 | 86°F | 65°F | 32% | 21% | 13 h 30 min |
| August 23 | 86°F | 65°F | 32% | 21% | 13 h 30 min |
| August 24 | 86°F | 65°F | 31% | 21% | 13 h 30 min |
| August 25 | 86°F | 64°F | 31% | 20% | 13 h 20 min |
| August 26 | 86°F | 64°F | 31% | 20% | 13 h 20 min |
| August 27 | 85°F | 64°F | 30% | 20% | 13 h 20 min |
| August 28 | 85°F | 64°F | 30% | 20% | 13 h 20 min |
| August 29 | 85°F | 64°F | 30% | 20% | 13 h 10 min |
| August 30 | 85°F | 63°F | 30% | 20% | 13 h 10 min |
| August 31 | 85°F | 63°F | 29% | 20% | 13 h 10 min |
- Normal high
- 87°FAugust average
- Normal low
- 65°FAugust average
- Precipitation
- 4.98 inmonth total
- Days with precipitation
- 100.01 inch or more
- Days at 90°F or more
- 10
- Daylight
- 14 h 20 min to 13 h 10 minAugust 1 to August 31
- Days at 70°F or more
- 31
- Days at 80°F or more
- 28
- Sunshine
- 77%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USC00366370; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Norristown in August?
On a given August day the chance of 0.01 inch or more is 33% on average, highest around August 1 (37%). In all, 4.98 in falls on 10 days of a normal August, 2 of them with an inch or more.
In a normal August in Norristown, 10 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USC00366370.
What are the records for August in Norristown?
The warmest August temperature on this station's record (since 1951) is 106°F, on August 10, 2001; the coldest is 40°F, on August 30, 1982. The wettest August brought 18.11 in (2011).
The August mean against the 1991-2020 normal of 75.9°F: 2021 77.5°F (+1.6), 2022 79.2°F (+3.3), 2023 74.9°F (−1.0), 2025 73.4°F (−2.5), 2026 76.7°F (+0.8). 3 of 5 ran warmer than normal.
| August | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 77.5°F | +1.6°F | 7.62 in |
| 2022 | 79.2°F | +3.3°F | 1.98 in |
| 2023 | 74.9°F | −1.0°F | 2.80 in |
| 2025 | 73.4°F | −2.5°F | 2.18 in |
| 2026 | 76.7°F | +0.8°F | 8.59 in |
Source: records: ACIS, station USC00366370; recent months: ACIS, station USC00366370. Records and recent months use complete months only.
How does August in Norristown compare across Pennsylvania?
Across the 108 places PlainClimate covers in Pennsylvania, August normal highs run from 75°F in Laporte to 87°F in Marcus Hook; Norristown's is 87°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.
Other months and places
- Norristown in July89°F by day, 67°F at night
- Norristown in September80°F by day, 58°F at night
- Norristown through the yearEvery month, frost dates, records and recent years
- Pennsylvania in AugustThe statewide normal and the warmest and coolest places
- Marcus Hook: Pennsylvania's warmest Augustnormal high 87°F