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City guide · California

Outdoor Project Weather in Vallejo, CA

This page runs Vallejo'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.

Six tasks · one forecast · California

JulyBest overall month
Lawn SeedingFriendliest task
1,459 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	—	Jul, Aug, Sep	Stain a Deck in Vallejo →
Exterior Painting	—	Jul, Aug, Sep	Paint Outside in Vallejo →
Driveway Sealing	—	Jul, Aug, Jun	Seal a Driveway in Vallejo →
Concrete Pouring	—	Jul, Aug, Sep	Pour Concrete in Vallejo →
Roof Coating	—	Jul, Aug, Sep	Coat a Roof in Vallejo →
Lawn Seeding	—	Jan, Mar, May	Seed a Lawn in Vallejo →

Keep the tour going — compare this calendar with Vacaville, CA behind you or Victorville, CA up next.

Project weather, month by month

Workable days per month by task, from NOAA 1991–2020 normals for NAPA CO AP, CA US. Darker = more workable days.
Task	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Deck Staining	0	10	22	24	28	29	31	31	29	28	13	0
Exterior Painting	0	10	22	24	28	29	31	31	29	28	13	0
Driveway Sealing	0	0	0	0	0	29	31	31	22	0	0	0
Concrete Pouring	0	10	22	24	28	29	31	31	29	28	13	0
Roof Coating	0	10	22	24	28	29	31	31	29	28	13	0
Lawn Seeding	31	29	31	30	31	30	31	31	30	31	30	31

Which task gets the most weather in Vallejo?

Lawn Seeding366days/yr
Deck Staining245days/yr
Exterior Painting245days/yr
Concrete Pouring245days/yr
Roof Coating245days/yr
Driveway Sealing113days/yr

Season edges differ by task — that's the point of checking six at once. In Vallejo the earliest opener starts around February and the last holdout closes after November. 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 — Vallejo's longest season at 366 workable days.

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Full 10-day checks

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Climatology: NOAA 1991–2020 normals via NAPA CO AP, CA US (11.3 km from Vallejo center); live outlook by Open-Meteo.