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City guide · Maine

Outdoor Project Weather in Portland, ME

This page runs Portland's forecast against all six task rulesets at once. Verdicts load live above; the month-by-month matrix below — built from NOAA 1991–2020 normals — shows when each job's season opens. Lawn Seeding gets the most calendar here: 204 workable days a year.

Six tasks · one forecast · Maine

AugustBest overall month
Lawn SeedingFriendliest task
732 task-daysWorkable task-days/yr
6Tasks tracked
Average of all six tasks

Today at a glance

Verdicts load live from the 10-day forecast; without JavaScript this column stays blank and the year-round matrix below still answers the planning question.
Task	Today	Best months here	Full 10-day check
Deck Staining	—	Aug, Sep, Jul	Stain a Deck in Portland →
Exterior Painting	—	Aug, Sep, Jul	Paint Outside in Portland →
Driveway Sealing	—	Aug, Jul, Jun	Seal a Driveway in Portland →
Concrete Pouring	—	Aug, Sep, Jul	Pour Concrete in Portland →
Roof Coating	—	Aug, Sep, Jul	Coat a Roof in Portland →
Lawn Seeding	—	May, Jul, Aug	Seed a Lawn in Portland →

Keep the tour going — compare this calendar with Augusta, ME behind you or Annapolis, MD up next.

Project weather, month by month

Workable days per month by task, from NOAA 1991–2020 normals for PORTLAND INTL JETPORT, ME US. Darker = more workable days.
Task	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Deck Staining	0	0	0	1	19	19	20	21	21	12	0	0
Exterior Painting	0	0	0	1	19	19	20	21	21	12	0	0
Driveway Sealing	0	0	0	0	1	19	20	21	15	0	0	0
Concrete Pouring	0	0	0	1	19	19	20	21	21	12	0	0
Roof Coating	0	0	0	1	19	19	20	21	21	12	0	0
Lawn Seeding	0	0	0	16	31	30	31	31	30	31	4	0

Which task gets the most weather in Portland?

Lawn Seeding204days/yr
Deck Staining113days/yr
Exterior Painting113days/yr
Concrete Pouring113days/yr
Roof Coating113days/yr
Driveway Sealing76days/yr

Season edges differ by task — that's the point of checking six at once. In Portland the earliest opener starts around April and the last holdout closes after October. A week that fails the paint rules on humidity can still pass seeding, and a frost that ends concrete season leaves sealing untouched until nights slip under 50°F.

If you only open one full check, make it lawn seeding — Portland's longest season at 204 workable days.

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Full 10-day checks

Maine

Climatology: NOAA 1991–2020 normals via PORTLAND INTL JETPORT, ME US (4.7 km from Portland center); live outlook by Open-Meteo.