WorkWindow

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.

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.
TaskTodayBest months hereFull 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 →

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.
TaskJanFebMarAprMayJunJulAugSepOctNovDec
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

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.

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.