Johnstown weather in August: Johnstown, Pennsylvania: normal highs, lows, rain and records for August
Johnstown in August has a normal high of 77°F and a normal low of 60°F, a daily mean of 69°F, falling from 78°F on the 1st to 75°F by the 31st. Measurable precipitation falls on 14 days in a normal August, 3.95 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 25°C and low of 16°C, 100 mm of precipitation in August.
- NOAA stationJohnstown Cambria County Airport
- Station IDUSW00004726
- Location40.32°N 78.83°W
- Elevation2,284 ft (696 m)
- From the center5 miles
- Population17,853
- Jan 33° 19°
- Feb 36° 21°
- Mar 45° 28°
- Apr 58° 38°
- May 68° 49°
- Jun 75° 57°
- Jul 79° 61°
- Aug 77° 60°
- Sep 71° 53°
- Oct 59° 43°
- Nov 47° 33°
- Dec 38° 25°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Johnstown in August?
The normal high is 77°F and the normal low 60°F, for a daily mean of 68.6°F. August is 1.3°F cooler than July and 7.0°F warmer than September. August is the 2nd warmest month of the year in Johnstown and the 5th wettest. Across the month the normal high falls 3°F, from 78°F on August 1 to 75°F on August 31. From one year to the next August's mean temperature typically moves about 2.1°F either way (NOAA's standard deviation), so roughly two Augusts in three average between 67°F and 71°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 46%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| August 1 | 78°F | 61°F | 46% | 27% |
| August 8 | 78°F | 61°F | 45% | 26% |
| August 15 | 77°F | 60°F | 43% | 25% |
| August 22 | 77°F | 59°F | 42% | 25% |
| August 31 | 75°F | 58°F | 41% | 23% |
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 | 78°F | 61°F | 46% | 27% | 14 h 20 min |
| August 2 | 78°F | 61°F | 45% | 27% | 14 h 20 min |
| August 3 | 78°F | 61°F | 45% | 27% | 14 h 20 min |
| August 4 | 78°F | 61°F | 45% | 27% | 14 h 10 min |
| August 5 | 78°F | 61°F | 45% | 27% | 14 h 10 min |
| August 6 | 78°F | 61°F | 45% | 27% | 14 h 10 min |
| August 7 | 78°F | 61°F | 45% | 27% | 14 h 10 min |
| August 8 | 78°F | 61°F | 45% | 26% | 14 h |
| August 9 | 78°F | 61°F | 44% | 26% | 14 h |
| August 10 | 78°F | 61°F | 44% | 26% | 14 h |
| August 11 | 78°F | 61°F | 44% | 26% | 14 h |
| August 12 | 78°F | 61°F | 44% | 26% | 14 h |
| August 13 | 78°F | 61°F | 44% | 26% | 13 h 50 min |
| August 14 | 78°F | 61°F | 43% | 26% | 13 h 50 min |
| August 15 | 77°F | 60°F | 43% | 25% | 13 h 50 min |
| August 16 | 77°F | 60°F | 43% | 25% | 13 h 50 min |
| August 17 | 77°F | 60°F | 43% | 25% | 13 h 40 min |
| August 18 | 77°F | 60°F | 43% | 25% | 13 h 40 min |
| August 19 | 77°F | 60°F | 43% | 25% | 13 h 40 min |
| August 20 | 77°F | 60°F | 42% | 25% | 13 h 40 min |
| August 21 | 77°F | 60°F | 42% | 25% | 13 h 30 min |
| August 22 | 77°F | 59°F | 42% | 25% | 13 h 30 min |
| August 23 | 76°F | 59°F | 42% | 24% | 13 h 30 min |
| August 24 | 76°F | 59°F | 42% | 24% | 13 h 30 min |
| August 25 | 76°F | 59°F | 41% | 24% | 13 h 30 min |
| August 26 | 76°F | 59°F | 41% | 24% | 13 h 20 min |
| August 27 | 76°F | 58°F | 41% | 24% | 13 h 20 min |
| August 28 | 76°F | 58°F | 41% | 23% | 13 h 20 min |
| August 29 | 75°F | 58°F | 41% | 23% | 13 h 20 min |
| August 30 | 75°F | 58°F | 41% | 23% | 13 h 10 min |
| August 31 | 75°F | 58°F | 41% | 23% | 13 h 10 min |
- Normal high
- 77°FAugust average
- Normal low
- 60°FAugust average
- Precipitation
- 3.95 inmonth total
- Days with precipitation
- 140.01 inch or more
- Daylight
- 14 h 20 min to 13 h 10 minAugust 1 to August 31
- Days at 70°F or more
- 28
- Days at 80°F or more
- 9
- Sunshine
- 75%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00004726; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Johnstown in August?
On a given August day the chance of 0.01 inch or more is 43% on average, highest around August 1 (46%). In all, 3.95 in falls on 14 days of a normal August, 1 of them with an inch or more.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00004726.
How humid and windy is Johnstown in August?
At 3 p.m. the normal temperature is 74°F with 57% relative humidity and a dew point of 57°F; at 6 a.m. it is 60°F with 89% humidity. The wind averages 6.5 mph, most often from the west in the afternoon.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 60°F | 57°F | 89% | 5.4 mph | – |
| 9 a.m. | 66°F | 58°F | 77% | 6.6 mph | – |
| noon | 72°F | 58°F | 62% | 7.9 mph | – |
| 3 p.m. | 74°F | 57°F | 57% | 8.4 mph | – |
| 6 p.m. | 71°F | 58°F | 64% | 6.9 mph | – |
| 9 p.m. | 66°F | 57°F | 74% | 5.9 mph | – |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00004726. Hourly normals exist only for NOAA's first-order stations; a dash where NOAA publishes no value for that hour (the sky at some hours).
What are the records for August in Johnstown?
The warmest August temperature on this station's record (since 2000) is 90°F, on August 2, 2002; the coldest is 44°F, on August 30, 2025. The wettest August brought 8.95 in (2007).
The August mean against the 1991-2020 normal of 68.6°F: 2021 72.1°F (+3.5), 2022 69.6°F (+1.0), 2023 68.2°F (−0.4), 2024 68.8°F (+0.2), 2025 66.8°F (−1.8), 2026 68.3°F (−0.3). 3 of 6 ran warmer than normal.
| August | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 72.1°F | +3.5°F | 6.89 in |
| 2022 | 69.6°F | +1.0°F | 4.63 in |
| 2023 | 68.2°F | −0.4°F | 5.15 in |
| 2024 | 68.8°F | +0.2°F | 8.25 in |
| 2025 | 66.8°F | −1.8°F | 0.49 in |
| 2026 | 68.3°F | −0.3°F | 6.12 in |
Source: records: ACIS, station USW00004726; recent months: ACIS, station USW00004726. Records and recent months use complete months only.
How does August in Johnstown 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; Johnstown's is 77°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.
Other months and places
- Johnstown in July79°F by day, 61°F at night
- Johnstown in September71°F by day, 53°F at night
- Johnstown 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