Plymouth weather in August: Plymouth, Massachusetts: normal highs, lows, rain and records for August
Plymouth in August has a normal high of 80°F and a normal low of 61°F, a daily mean of 71°F, falling from 82°F on the 1st to 78°F by the 31st. Measurable precipitation falls on 13 days in a normal August, 3.46 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 27°C and low of 16°C, 88 mm of precipitation in August.
- NOAA stationPlymouth Municipal Airport
- Station IDUSW00054769
- Location41.91°N 70.73°W
- Elevation149 ft (45 m)
- Population (town)66,663
- Census place7,852
- Jan 38° 20°
- Feb 40° 21°
- Mar 46° 27°
- Apr 57° 36°
- May 67° 46°
- Jun 76° 55°
- Jul 82° 62°
- Aug 80° 61°
- Sep 73° 53°
- Oct 63° 42°
- Nov 53° 33°
- Dec 43° 26°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Plymouth in August?
The normal high is 80°F and the normal low 61°F, for a daily mean of 70.5°F. August is 1.4°F cooler than July and 7.3°F warmer than September. August is the 2nd warmest month of the year in Plymouth and the 10th wettest. Across the month the normal high falls 4°F, from 82°F on August 1 to 78°F on August 31. From one year to the next August's mean temperature typically moves about 2.2°F either way (NOAA's standard deviation), so roughly two Augusts in three average between 68°F and 73°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 43%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| August 1 | 82°F | 62°F | 41% | 18% |
| August 8 | 82°F | 62°F | 42% | 19% |
| August 15 | 81°F | 61°F | 43% | 19% |
| August 22 | 80°F | 60°F | 43% | 19% |
| August 31 | 78°F | 58°F | 43% | 19% |
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 | 82°F | 62°F | 41% | 18% | 14 h 30 min |
| August 2 | 82°F | 62°F | 41% | 18% | 14 h 30 min |
| August 3 | 82°F | 62°F | 41% | 18% | 14 h 20 min |
| August 4 | 82°F | 62°F | 41% | 18% | 14 h 20 min |
| August 5 | 82°F | 62°F | 41% | 18% | 14 h 20 min |
| August 6 | 82°F | 62°F | 42% | 18% | 14 h 20 min |
| August 7 | 82°F | 62°F | 42% | 18% | 14 h 10 min |
| August 8 | 82°F | 62°F | 42% | 19% | 14 h 10 min |
| August 9 | 81°F | 62°F | 42% | 19% | 14 h 10 min |
| August 10 | 81°F | 62°F | 42% | 19% | 14 h 10 min |
| August 11 | 81°F | 62°F | 42% | 19% | 14 h |
| August 12 | 81°F | 62°F | 43% | 19% | 14 h |
| August 13 | 81°F | 61°F | 43% | 19% | 14 h |
| August 14 | 81°F | 61°F | 43% | 19% | 14 h |
| August 15 | 81°F | 61°F | 43% | 19% | 14 h |
| August 16 | 81°F | 61°F | 43% | 19% | 13 h 50 min |
| August 17 | 81°F | 61°F | 43% | 19% | 13 h 50 min |
| August 18 | 80°F | 61°F | 43% | 19% | 13 h 50 min |
| August 19 | 80°F | 61°F | 43% | 19% | 13 h 50 min |
| August 20 | 80°F | 60°F | 43% | 19% | 13 h 40 min |
| August 21 | 80°F | 60°F | 43% | 19% | 13 h 40 min |
| August 22 | 80°F | 60°F | 43% | 19% | 13 h 40 min |
| August 23 | 80°F | 60°F | 43% | 19% | 13 h 40 min |
| August 24 | 79°F | 60°F | 43% | 19% | 13 h 30 min |
| August 25 | 79°F | 59°F | 43% | 19% | 13 h 30 min |
| August 26 | 79°F | 59°F | 43% | 19% | 13 h 30 min |
| August 27 | 79°F | 59°F | 43% | 19% | 13 h 20 min |
| August 28 | 79°F | 59°F | 43% | 19% | 13 h 20 min |
| August 29 | 78°F | 59°F | 43% | 19% | 13 h 20 min |
| August 30 | 78°F | 58°F | 43% | 19% | 13 h 20 min |
| August 31 | 78°F | 58°F | 43% | 19% | 13 h 10 min |
- Normal high
- 80°FAugust average
- Normal low
- 61°FAugust average
- Precipitation
- 3.46 inmonth total
- Days with precipitation
- 130.01 inch or more
- Days at 90°F or more
- 2
- Daylight
- 14 h 30 min to 13 h 10 minAugust 1 to August 31
- Days at 70°F or more
- 29
- Days at 80°F or more
- 18
- Sunshine
- 80%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00054769; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Plymouth in August?
On a given August day the chance of 0.01 inch or more is 42% on average, highest around August 15 (43%). In all, 3.46 in falls on 13 days of a normal August, 1 of them with an inch or more.
In a normal August in Plymouth, 2 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00054769.
How humid and windy is Plymouth in August?
At 3 p.m. the normal temperature is 76°F with 57% relative humidity and a dew point of 59°F; at 6 a.m. it is 62°F with 89% humidity. The wind averages 6.2 mph, most often from the south in the afternoon.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 62°F | 59°F | 89% | 4.0 mph | – |
| 9 a.m. | 71°F | 60°F | 68% | 8.2 mph | – |
| noon | 75°F | 59°F | 57% | 9.4 mph | – |
| 3 p.m. | 76°F | 59°F | 57% | 9.6 mph | – |
| 6 p.m. | 70°F | 60°F | 70% | 5.9 mph | – |
| 9 p.m. | 65°F | 60°F | 85% | 4.1 mph | – |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00054769. 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 Plymouth?
The warmest August temperature on this station's record (since 1996) is 99°F, on August 2, 2006; the coldest is 46°F, on August 21, 2000. The wettest August brought 6.68 in (2022).
The August mean against the 1991-2020 normal of 70.5°F: 2021 73.9°F (+3.4), 2022 74.7°F (+4.2), 2023 70.1°F (−0.4), 2024 71.1°F (+0.6), 2025 67.9°F (−2.6), 2026 72.3°F (+1.8). 4 of 6 ran warmer than normal.
| August | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 73.9°F | +3.4°F | 0.02 in |
| 2022 | 74.7°F | +4.2°F | 6.68 in |
| 2023 | 70.1°F | −0.4°F | 5.10 in |
| 2024 | 71.1°F | +0.6°F | 4.39 in |
| 2025 | 67.9°F | −2.6°F | – |
| 2026 | 72.3°F | +1.8°F | 3.74 in |
Source: records: ACIS, station USW00054769; recent months: ACIS, station USW00054769. Records and recent months use complete months only.
How does August in Plymouth compare across Massachusetts?
Across the 35 places PlainClimate covers in Massachusetts, August normal highs run from 76°F in East Sandwich to 85°F in Maynard; Plymouth's is 80°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.