WorkWindow

Outdoor Project Weather in San Mateo, CA

This page runs San Mateo'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: 366 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 — Jul, Aug, Sep Stain a Deck in San Mateo →
Exterior Painting — Jul, Aug, Sep Paint Outside in San Mateo →
Driveway Sealing — Jul, Aug, Sep Seal a Driveway in San Mateo →
Concrete Pouring — Jul, Aug, Sep Pour Concrete in San Mateo →
Roof Coating — Jul, Aug, Sep Coat a Roof in San Mateo →
Lawn Seeding — Jan, Mar, May Seed a Lawn in San Mateo →

Project weather, month by month

Workable days per month by task, from NOAA 1991–2020 normals for SAN FRANCISCO INTL AP, CA US. Darker = more workable days.
TaskJanFebMarAprMayJunJulAugSepOctNovDec
Deck Staining 20 18 21 24 28 29 31 31 29 28 23 20
Exterior Painting 20 18 21 24 28 29 31 31 29 28 23 20
Driveway Sealing 0 0 0 3 28 29 31 31 29 28 6 0
Concrete Pouring 20 18 21 24 28 29 31 31 29 28 23 20
Roof Coating 20 18 21 24 28 29 31 31 29 28 23 20
Lawn Seeding 31 29 31 30 31 30 31 31 30 31 30 31

Season edges differ by task — that's the point of checking six at once. In San Mateo the earliest opener starts around May 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 — San Mateo's longest season at 366 workable days.

Full 10-day checks

California

Climatology: NOAA 1991–2020 normals via SAN FRANCISCO INTL AP, CA US (8.9 km from San Mateo center); live outlook by Open-Meteo.