Mild
Average highs are around 21°C, so days are mild rather than hot.
September verdict
Portland, Maine, United States in September
Weather score45Mixed
Mixed for holiday weather
Average highs are around 21°C, so days are mild rather than hot. Sunshine averages 7.4h per day, enough for a balanced month. Rainfall averages 81mm, so some wet days are possible.
September weather
Monthly averages
Temp
21°C
Rain
81mm
Sun
7.4h
Sea
16°C
Weather score
45
Mixed
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
SwimSwim
Weather scoreWeather score
Trip feel
Showers
Rainfall averages 81mm, so some wet days are possible.
Some sun
Sunshine averages 7.4h per day, enough for a balanced month.
Cool sea
Sea temperatures average 16°C, so the water can feel cool.
Map
Weather map
Compare Portland, Maine, United States with nearby places by weather score, rain, sun, temperature, and swim conditions.
Temperature
September21°C average high
September sits in the warmer part of the year, so midday sightseeing can feel heavier than in cooler months.
Warmest monthsJune to September
This stretch sets the upper range for average daytime heat.
Rain
September81mm average rain
September sits on the drier side of Portland's year, which helps with sightseeing and transfers.
Driest monthsJanuary to October
This is the drier part of the year, when outdoor plans usually need less weather flexibility.
Sun
September7.4 hours average sun
September sits close to Portland's yearly sunshine average, so it is a middle-of-the-pack month for bright days.
Brightest monthsJune to August
This stretch has the strongest sunshine in the monthly averages.
Sea temperature
September16°C average sea
September sits in the warmer sea-temperature season, usually making swimming easier to enjoy.
Warmest seaJuly to September
Sea temperatures are usually near 17°C in this stretch, so swimming comfort is at its strongest.
Weather score
September45 weather score
September sits close to Portland's yearly weather-score average, giving a typical overall read on the month.
Best weather monthsJuly to August
These months have the strongest weather score in the monthly averages.
Hotels in Portland, Maine, United States
Marriott
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The Ritz-Carlton, PortlandPortland, Oregon, USA
The Nines, a Luxury Collection Hotel, PortlandPortland, Oregon, USA
Portland Marriott Downtown WaterfrontPortland, Oregon, USA
The Bidwell Marriott PortlandPortland, Oregon, USA
The Westin Portland HarborviewPortland, Maine, USA
Sheraton Portland Airport HotelPortland, Oregon, USA