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City guide · Missouri

Outdoor Project Weather in St. Louis, MO

One forecast, six label checks. Today's verdict for every task in St. Louis loads above; the matrix below shows the whole year at a glance, computed from NOAA 1991–2020 normals at Cahokia, Il Us. The friendliest calendar here belongs to lawn seeding (169 workable days a year).

Six tasks · one forecast · Missouri

SeptemberBest overall month
Lawn SeedingFriendliest task
883 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, Oct	Stain a Deck in St. Louis →
Exterior Painting	—	Aug, Sep, Oct	Paint Outside in St. Louis →
Driveway Sealing	—	Aug, Sep, Jul	Seal a Driveway in St. Louis →
Concrete Pouring	—	Aug, Sep, Oct	Pour Concrete in St. Louis →
Roof Coating	—	Aug, Sep, Oct	Coat a Roof in St. Louis →
Lawn Seeding	—	May, Oct, Apr	Seed a Lawn in St. Louis →

Keep the tour going — compare this calendar with Springfield, MO behind you or Billings, MT up next.

Project weather, month by month

Workable days per month by task, from NOAA 1991–2020 normals for CAHOKIA, IL US. Darker = more workable days.
Task	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Deck Staining	0	0	0	18	19	20	23	23	23	23	1	0
Exterior Painting	0	0	0	18	19	20	23	23	23	23	1	0
Driveway Sealing	0	0	0	2	19	20	23	23	23	4	0	0
Concrete Pouring	0	0	0	18	19	20	23	23	23	23	1	0
Roof Coating	0	0	0	18	19	20	23	23	23	23	1	0
Lawn Seeding	0	0	15	30	31	15	0	1	30	31	16	0

Which task gets the most weather in St. Louis?

Lawn Seeding169days/yr
Deck Staining150days/yr
Exterior Painting150days/yr
Concrete Pouring150days/yr
Roof Coating150days/yr
Driveway Sealing114days/yr

The composite season in St. Louis opens around March and closes after October: coatings wait on warm nights, concrete on freeze-free 48-hour stretches, seeding on the 55–80°F germination band. Between those bookends, the right question is which task fits this week — which is what the verdicts above answer.

Deepest calendar first: start with lawn seeding in St. Louis (169 workable days a year), then work down the matrix.

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Full 10-day checks

Missouri

Climatology: NOAA 1991–2020 normals via CAHOKIA, IL US (8.9 km from St. Louis center); live outlook by Open-Meteo.