Castine climate

Castine Weather in May

NOAA 1991-2020 normals for Belfast, 15.1 km from Castine

Average highs run from 58°F on May 1 to 67°F on May 31, and lows from 37°F to 46°F. Normal precipitation for the month is 3.86 in over about 10 wet days.

May day by day

The normal high and low for each date, and the record, in °F.

Normal daily high and low temperature at Castine, in °F, with the record for each date.20406080100151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

May at a glance

Average high
63°F
Average low
41°F
Precipitation
3.86 in
Record high
90°FMay 20, 2026
Record low
26°FMay 18, 2023
Chance of a freeze
80%
Daylight
14 h 13 min to 15 h 17 min
Cloud cover
68%
Humidity
81%
Dew point
45°F
Wind
5.6 mph

Every day of the month

A wet day has at least 0.01 inch of precipitation; snow means at least 0.1 inch of snowfall.

DateNormal highNormal lowRecord highRecord lowChance wetChance of snow
May 158°F37°F64°F 201328°F 201932%1%
May 258°F37°F79°F 201828°F 201532%1%
May 359°F37°F71°F 201834°F 202032%1%
May 459°F38°F66°F 202030°F 202632%1%
May 560°F38°F72°F 201532°F 201332%1%
May 660°F38°F76°F 202328°F 202032%0%
May 760°F39°F82°F 201530°F 202132%0%
May 861°F39°F70°F 201330°F 202232%0%
May 961°F39°F70°F 202228°F 201933%0%
May 1061°F40°F72°F 202230°F 202333%0%
May 1162°F40°F79°F 202331°F 202033%0%
May 1262°F40°F81°F 202229°F 201833%0%
May 1362°F40°F70°F 202328°F 202033%0%
May 1462°F41°F83°F 202228°F 202033%0%
May 1563°F41°F72°F 202332°F 201333%0%
May 1663°F41°F76°F 201733°F 201933%0%
May 1763°F42°F81°F 202636°F 202033%0%
May 1864°F42°F89°F 201726°F 202333%0%
May 1964°F42°F82°F 201731°F 201833%0%
May 2064°F43°F90°F 202633°F 202033%0%
May 2165°F43°F76°F 201835°F 201533%0%
May 2265°F43°F87°F 202034°F 202632%0%
May 2365°F43°F81°F 202432°F 202332%0%
May 2465°F44°F79°F 202430°F 202032%0%
May 2566°F44°F86°F 201834°F 202032%0%
May 2666°F44°F82°F 201236°F 202332%0%
May 2766°F45°F81°F 202638°F 201332%0%
May 2867°F45°F88°F 202336°F 201932%0%
May 2967°F45°F84°F 201832°F 201432%0%
May 3067°F46°F84°F 202236°F 202332%0%
May 3167°F46°F85°F 201333°F 202632%0%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Castine, in percent, and of at least 0.1 inch of snowfall.0102030401102030
  • Chance of a wet day
  • Chance of snowfall

Sunrise and sunset

Times for 2026, local time (EDT).

May 1
sunrise 5:26 AM, sunset 7:39 PM
May 31
sunrise 4:55 AM, sunset 8:12 PM

Every day of May: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00170480 (Belfast), public domain. Records: NOAA GHCN-Daily, station USC00172443, every year on file, quality-flagged values removed. Cloud, humidity, wind and sunshine: NASA POWER (MERRA-2, CERES and GEWEX SRB), 1991-2020. The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center's Prediction Of Worldwide Energy Resources (POWER) project funded through the NASA Earth Science Division: POWER Daily API v2, accessed 2026-09-24. Sun and moon: computed with the NOAA solar equations and Meeus.