Plymouth weather in May: Plymouth, Massachusetts: normal highs, lows, rain and records for May
Plymouth in May has a normal high of 67°F and a normal low of 46°F, a daily mean of 56°F, rising from 63°F on the 1st to 71°F by the 31st. Measurable precipitation falls on 14 days in a normal May, 3.54 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 20°C and low of 8°C, 90 mm of precipitation in May.
- 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 May?
The normal high is 67°F and the normal low 46°F, for a daily mean of 56.4°F. May is 10.3°F warmer than April and 9.3°F cooler than June. May is the 5th warmest month of the year in Plymouth and the 9th wettest. Across the month the normal high rises 8°F, from 63°F on May 1 to 71°F on May 31. From one year to the next May's mean temperature typically moves about 2.4°F either way (NOAA's standard deviation), so roughly two Mays in three average between 54°F and 59°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 |
|---|---|---|---|---|
| May 1 | 63°F | 41°F | 45% | 24% |
| May 8 | 65°F | 43°F | 45% | 24% |
| May 15 | 67°F | 45°F | 46% | 25% |
| May 22 | 69°F | 48°F | 46% | 25% |
| May 31 | 71°F | 50°F | 46% | 24% |
Every day of May: normal high, low and chance of precipitation (warmest afternoon May 31, coldest night May 1)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| May 1 | 63°F | 41°F | 45% | 24% | 14 h |
| May 2 | 63°F | 41°F | 45% | 24% | 14 h |
| May 3 | 63°F | 42°F | 45% | 24% | 14 h |
| May 4 | 64°F | 42°F | 45% | 24% | 14 h 10 min |
| May 5 | 64°F | 42°F | 45% | 24% | 14 h 10 min |
| May 6 | 64°F | 43°F | 45% | 24% | 14 h 10 min |
| May 7 | 65°F | 43°F | 45% | 24% | 14 h 10 min |
| May 8 | 65°F | 43°F | 45% | 24% | 14 h 20 min |
| May 9 | 65°F | 44°F | 45% | 24% | 14 h 20 min |
| May 10 | 66°F | 44°F | 46% | 25% | 14 h 20 min |
| May 11 | 66°F | 44°F | 46% | 25% | 14 h 20 min |
| May 12 | 66°F | 45°F | 46% | 25% | 14 h 20 min |
| May 13 | 67°F | 45°F | 46% | 25% | 14 h 30 min |
| May 14 | 67°F | 45°F | 46% | 25% | 14 h 30 min |
| May 15 | 67°F | 45°F | 46% | 25% | 14 h 30 min |
| May 16 | 67°F | 46°F | 46% | 25% | 14 h 30 min |
| May 17 | 68°F | 46°F | 46% | 25% | 14 h 40 min |
| May 18 | 68°F | 46°F | 46% | 25% | 14 h 40 min |
| May 19 | 68°F | 47°F | 46% | 25% | 14 h 40 min |
| May 20 | 68°F | 47°F | 46% | 25% | 14 h 40 min |
| May 21 | 69°F | 47°F | 46% | 25% | 14 h 40 min |
| May 22 | 69°F | 48°F | 46% | 25% | 14 h 40 min |
| May 23 | 69°F | 48°F | 46% | 25% | 14 h 50 min |
| May 24 | 69°F | 48°F | 46% | 24% | 14 h 50 min |
| May 25 | 70°F | 49°F | 46% | 24% | 14 h 50 min |
| May 26 | 70°F | 49°F | 46% | 24% | 14 h 50 min |
| May 27 | 70°F | 49°F | 46% | 24% | 14 h 50 min |
| May 28 | 71°F | 49°F | 46% | 24% | 14 h 50 min |
| May 29 | 71°F | 50°F | 46% | 24% | 15 h |
| May 30 | 71°F | 50°F | 46% | 24% | 15 h |
| May 31 | 71°F | 50°F | 46% | 24% | 15 h |
- Normal high
- 67°FMay average
- Normal low
- 46°FMay average
- Precipitation
- 3.54 inmonth total
- Days with precipitation
- 140.01 inch or more
- Nights at 32°F or colder
- 1
- Daylight
- 14 h to 15 hMay 1 to May 31
- Days at 70°F or more
- 12
- Days at 80°F or more
- 3
- Sunshine
- 72%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 May?
On a given May day the chance of 0.01 inch or more is 45% on average, highest around May 15 (46%). In all, 3.54 in falls on 14 days of a normal May, 1 of them with an inch or more.
In a normal May in Plymouth, 1 nights fall to freezing.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00054769.
How humid and windy is Plymouth in May?
At 3 p.m. the normal temperature is 68°F with 57% relative humidity and a dew point of 52°F; at 6 a.m. it is 57°F with 85% humidity. The wind averages 7.5 mph, most often from the south-southwest in the afternoon.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 57°F | 52°F | 85% | 6.5 mph | – |
| 9 a.m. | 64°F | 53°F | 67% | 9.1 mph | – |
| noon | 68°F | 53°F | 58% | 10.3 mph | – |
| 3 p.m. | 68°F | 52°F | 57% | 10.4 mph | – |
| 6 p.m. | 64°F | 52°F | 65% | 8.4 mph | – |
| 9 p.m. | 58°F | 53°F | 82% | 5.5 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 May in Plymouth?
The warmest May temperature on this station's record (since 1996) is 93°F, on May 26, 2010; the coldest is 26°F, on May 7, 2001. The wettest May brought 9.77 in (2025).
The May mean against the 1991-2020 normal of 56.4°F: 2021 57.2°F (+0.8), 2022 59.3°F (+2.9), 2023 57.0°F (+0.6), 2024 58.2°F (+1.8), 2025 58.4°F (+2.0), 2026 57.3°F (+0.9). 6 of 6 ran warmer than normal.
| May | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 57.2°F | +0.8°F | 4.78 in |
| 2022 | 59.3°F | +2.9°F | 2.32 in |
| 2023 | 57.0°F | +0.6°F | 2.20 in |
| 2024 | 58.2°F | +1.8°F | 5.24 in |
| 2025 | 58.4°F | +2.0°F | 9.77 in |
| 2026 | 57.3°F | +0.9°F | 3.59 in |
Source: records: ACIS, station USW00054769; recent months: ACIS, station USW00054769. Records and recent months use complete months only.
How does May in Plymouth compare across Massachusetts?
Across the 35 places PlainClimate covers in Massachusetts, May normal highs run from 61°F in Nantucket to 73°F in Maynard; Plymouth's is 67°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.