Lewiston, ME weather in May
Lewiston is cool in May, with frequent rain: highs average 65°F and nights drop to about 40°F. There are about 13 days with rain.
- Normal high
- 65°F
- Normal low
- 40°F
- Wet days
- 13
- 3.6 in total
- Muggy days
- 0
- dew point 65°F+
How May changes from start to finish
| May 1 | May 31 | |
|---|---|---|
| Normal high | 61°F | 69°F |
| Normal low | 35°F | 45°F |
| Chance of a wet day | 41% | 43% |
| Sunrise / sunset | 5:32 am / 7:43 pm | 5:01 am / 8:16 pm |
| Daylight | 14.2 h | 15.3 h |
Chance of a wet day: average for the first and last 7 days of the month. Times are local clock time (Eastern Time).
A typical May day
- 6 am48°Fdew point 42°F
- 9 am56°Fdew point 42°F
- Noon61°Fdew point 41°F
- 3 pm63°Fdew point 41°F
- 6 pm59°Fdew point 42°F
- 9 pm52°Fdew point 42°F
NOAA hourly normals (local standard time) from Augusta State Airport (26 mi away); average wind 8 mph.
What kind of days to expect
- Comfortable dayshigh 65-80°F and dew point under 60°F14 of 31
- Hot dayshigh 90°F or more0 of 31
- Muggy daysdaily mean dew point 65°F or more0 of 31
- Wet daysat least 0.01 in of rain or melted snow13 of 31
- Notable rainat least 0.10 in8 of 31
- Freezing nightslow 32°F or below5 of 31
- Snow on the groundsnow depth 1 in or more0 of 31
Average days per May, counted from daily records for each year 1991-2020.
Rain in May
Normal precipitation is 3.6 in; a dry May brings about 1.9 in and a wet one about 4.7 in (25th and 75th percentiles). About 3 days bring half an inch or more, and about 1 an inch or more. Snow is very rare.
How May varies from year to year
- Warmest May, 1991-20202015: average high 71°F
- Coolest May2003: average high 59°F
- Wettest May2006: 8.9 in
- Driest May2015: 0.7 in
- Highest reading95°F (May 19, 2017)
- Lowest reading24°F (May 1, 2008)
From the station's daily records with NOAA quality flags removed; most recent date shown when a reading repeats.
May compared with April and June
| April | May | June | |
|---|---|---|---|
| Normal high | 54°F | 65°F | 74°F |
| Normal low | 30°F | 40°F | 50°F |
| Wet days | 12 | 13 | 14 |
| Comfortable days | 4 | 14 | 15 |
| Daylight | 13.5 h | 14.8 h | 15.4 h |
Highs change by +11°F from April and +9°F into June.
Nearby alternatives in May
- Warmer: Springfield, MA183 mi · high 72°F · 12 wet days
How Lewiston ranks in May
- Normal high334th warmest of 378 cities; 2nd of 5 in Maine
- Wet days343rd driest of 378
- Comfortable days130th most of 339
What to pack for Lewiston in May
- A warm jacket – lows near 40°F, highs near 65°F
- Layers – afternoons near 65°F but nights near 40°F
- A rain jacket or umbrella – rain on about 13 days
Heating and cooling
May has 391 heating degree days and 5 cooling degree days (base 65°F), 5% of the year's total heating and cooling demand.
Questions
How cold is Lewiston in May?
The normal high is 65°F and the normal low is 40°F. From 1991 to 2020 the coldest May reading was 24°F (most recently on May 1, 2008).
Does it rain a lot in Lewiston in May?
About 13 days in May have at least 0.01 in of precipitation, and the normal total is 3.6 in. The wettest May in 1991-2020 was in 2006 (8.9 in); the driest was in 2015 (0.7 in).
Does it snow in Lewiston in May?
Snow is very rare: the 1991-2020 normal for May rounds to 0.0 in.
Is May a good time to visit Lewiston?
May ranks 2nd of 12 months on our comfort score for Lewiston (71 out of 100). It has about 14 comfortable days. The best months are May, June and September.
Where the numbers come from
- Temperature, rain, snowfall and snow depth: Durham (USC00172048), 9.1 mi SE of the city center, 140 ft (78 ft lower than the city). NOAA normals and daily records, 1991-2020.
- Frost dates: Lewiston (USC00174566), 0.1 mi WSW of the city center, 180 ft . NOAA normals and daily records, 1991-2020.
- Humidity and wind by hour: Augusta State Airport (USW00014605), 26 mi NE of the city center, 350 ft (132 ft higher than the city). NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: Augusta State Airport (726185-14605), 26 mi NE of the city center, 349 ft (131 ft higher than the city). Hourly observations, 1991-2020.
- Not available for this location: cloud cover (no station close enough or similar enough in elevation).