These details are provided by the NWS offices in Gray Maine, and the surrounding NWS offices in New York, and Massachusetts.  I have modified some of the technical stuff to help make it more understandable for the average reader.

Last update: 6/28 - 7:30 AM

NEAR TERM /TODAY/...
725 AM Update...
Just a few minor tweaks to the forecast to round out T/Td trends for this morning. Otherwise, a fine morning is underway with temperatures rising through the 50s and into the 60s.

Previously... Today will be a much more comfortable summer day compared to the last few, with dew points back down in the 40s/50s and temperatures warming into 70s to near 80... aided by a downsloping wind for southern and coastal areas. Looking aloft... a shortwave will be crossing, but given the dry air mass mixed in overnight there won`t be much with it other than some fair weather cumulus clouds, and maybe some sprinkles toward the west early in the day. Winds meanwhile will be refreshing and out of the northwest veering westerly late in the day, just strong enough to keep the seabreeze from making much inroads along the coast.

SHORT TERM /TONIGHT THROUGH WEDNESDAY:
Surface high pressure will be building broadly over the east coast through mid-week, although the troughy pattern largely remains over eastern NOAM. A shortwave ridge will cross the area tonight which will have us clearing and calming, which will probably lead to the development of patchy valley fog with temperatures falling into the 40s in sheltered valleys, 50s elsewhere.

On Wednesday, another trough axis will approach from the west with surface high pressure centering itself south of New England. Winds will take on a more southerly to southwesterly clip as a result which combined with a warming airmass aloft will make for a little warmer day than today. High temperatures are forecast to reach into the 80s, except for in the western Maine Mountains and portions of Coos Co NH where more clouds limit highs to the 70s. Shower chances will increase from the west with the approaching trough, and remain mostly in the mountain until later in the evening.

LONG TERM /WEDNESDAY NIGHT THROUGH MONDAY:
Overview...

A weak cold front crosses the area Wednesday night, but a building ridge continues to bring seasonable warmth through the end of the week. Temperatures peak on Friday as the ridge crests the area, with many areas warming into the 90s. A cold front likely brings widespread showers and some thunderstorms on Saturday, along with cooler temperatures. Seasonable conditions return early next week.

Details...

The passing cold front Wednesday night will likely only bring a few scattered showers to northern areas, but otherwise it`s passage will be rather benign. Temps are expected to range from the mid 70s to mid 80s from north to south on Thursday.

A warm front then passes through early Friday, setting up Friday to be the hottest day of the stretch. Temps will likely warm into the upper 80s to mid 90s across most interior areas. Even the southern coastline will likely briefly warm to near 90 with the southwesterly flow delaying and limiting any seabreeze influence. The MidCoast will likely manage to escape the heat with highs in the 70s and 80s expected. Dew points are expected to mostly remains in the 50s, so heat index values aren`t expected to differ much from the actual air temperatures.

A slow moving cold front gradually crosses the area on Saturday, bringing periods of showers and some thunderstorms to the area. With the front already crossing the area during the morning, the threat of thunderstorms looks to be limited at this point, but some more widespread or stronger storms would be more likely across southeast New Hampshire where temps warm into the mid to upper 80s. While it won`t be as hot as Friday, dew points in the 60s to near 70 will make Saturday feel a lot more muggy.

Behind the front, high pressure brings a return to drier conditions and seasonable temperatures for Sunday and early next week. A gradual moderating trend likely resumes next week as the airmass begins to modify.