Summer Set, Missouri Weather
Thunder quiets the land. Day 93 of summer. Read this microseason across nine climate regions →
Summer Set weather forecast — hour by hour, 7-day outlook, NOAA radar
Conditions updated 1:00 AM CDT · Open-Meteo
- TodaySep 21Drizzle later74%0.03″79°68°—
- TuesdaySep 22Overcast14%—67°61°-12°
- WednesdaySep 23Overcast——77°55°+10°
- ThursdaySep 24Overcast——78°54°+1°
- FridaySep 25Overcast——81°59°+3°
- SaturdaySep 26Overcast——75°60°-6°
- SundaySep 27Overcast——81°58°+6°
Air quality now AQI 42 · Good
AQI 42 (Good), driven by PM2.5. AQI flat over the last 6 hours (within ±3 points). PM scrubbed by 2 hours of recent rain — PM2.5 down to 9.6 µg/m³, PM10 to 9.8 µg/m³.
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion.
What's driving it
Ozone × UV × Sky
Ozone at AQI 31. Overcast through the UV peak window (cloud cover ~97%) — afternoon ozone should stay flat.
- Present
- AQI 31
- UV peak
- 3.3 at 1 PM
- Sky at peak
- overcast
- Projected peak
- AQI 7
PM × Wind × Precip
PM scrubbed by 2 hours of recent rain — PM2.5 down to 9.6 µg/m³, PM10 to 9.8 µg/m³.
- PM2.5/PM10
- 0.98
- Wind
- calm
- Recent rain
- 2h in last 6h
- Pattern
- washed out
Trends
Seven days of AQI and PM2.5.
Hourly air-quality data from the Copernicus Atmosphere Monitoring Service, charted across the past and next several days. Dashed lines mark the AQI breakpoints at 50 (Good → Moderate) and 100 (Moderate → Unhealthy for Sensitive Groups).
September dries up ditches or breaks down bridges.
- Moonrise
- 4:30 PM
- Moonset
- 1:29 AM
- In sign
- ♑︎ Capricorn
Thunder quiets the land
Read this microseason across nine climate regions →
All 72 microseasons on the year wheel →
Summer Set at a glance
- Today vs. normal: Today averages 74°F (high 79°F, low 68°F), 7°F above the 67°F normal for Sep 21
- Last frost: April 9 (1991–2020 median, NOAA station 22 km away)
- Microseason: Sep 21–25
- Planting calendar: September — plant garlic (overwinter); harvest tomatoes, peppers, beans, summer squash, winter squash
15-Day Forecast — Summer Set
- Mon79°68°74%
- Tue67°61°14%
- Wed77°55°1%
- Thu78°54°0%
- Fri81°59°1%
- Sat75°60°6%
- Sun81°58°9%
- Mon82°55°14%
- Tue84°59°27%
- Wed82°57°18%
- Thu79°50°9%
- Fri84°54°16%
- Sat79°64°11%
- Sun95°75°13%
- Mon88°69°10%
Forecast data from Open-Meteo (CC BY 4.0).
Right now in the garden
Fall planting + final harvests
As of September 21, the season's first frost (typically October 26) is approaching. Pick what frost-tender plants still carry before the next cold front. This city's planting calendar for September: plant garlic (overwinter); harvest tomatoes, peppers, beans, summer squash, and winter squash.
SPC Convective Outlook
Storm Prediction Center — Summer Set
SPC includes Summer Set in the general thunderstorm area today — no severe risk, but storms are possible.
- TODAYTSTMGeneral Thunderstorms
- TOMORROWNONENo severe risk
- DAY 3NONENo severe risk
Thunderstorms possible. Not severe, but capable of producing lightning and brief heavy rain.
Source: NOAA / NWS Storm Prediction Center categorical convective outlook.
Sun & seasons in Summer Set
Summer Set sits in Jefferson County, where the year’s longest day runs 14h 49m of daylight and its shortest just 9h 31m — a swing of +5h 18m between the June and December solstices. Clocks spring forward on Sunday, March 8, 2026 and fall back on Sunday, November 1, 2026.
St. Louis, the state’s largest city, lies about 42 miles to the NNE. The nearest town Summer Set tracks is St. Louis, roughly 42 miles to the NNE.
Air quality in Summer Set
Air quality in Summer Set’s county has held roughly steady since 2020; its cleanest year on record was 2024 (median AQI 40).
Planting calendar
| Month | Plant | Harvest |
|---|---|---|
| March | lettuce, peas, spinach, radishes | — |
| April | lettuce, peas, spinach, radishes | spinach, radishes |
| May | tomatoes, peppers, beans, squash | lettuce, peas, spinach, radishes |
| June | tomatoes, peppers, beans, squash | lettuce, peas, spinach, beans, summer squash, garlic |
| July | tomatoes, peppers, beans, squash | tomatoes, peppers, beans, summer squash, garlic |
| August | beans, squash, fall brassicas, carrots | tomatoes, peppers, beans, summer squash, winter squash |
| September | garlic (overwinter) | tomatoes, peppers, beans, summer squash, winter squash |
| October | garlic (overwinter) | tomatoes, peppers, beans, summer squash, winter squash, fall brassicas, carrots |
| November | — | fall brassicas, carrots |
A year in weather
July is Summer Set's warmest stretch (~78°F) and January its coldest (~32°F); precipitation crests in April at 4.9 inches and ebbs in February to 2.5 inches.
| Month | Mean temp | Precip | Rainy days |
|---|---|---|---|
| January | 32° | 2.7″ | 8 |
| February | 36° | 2.5″ | 7 |
| March | 45° | 4.0″ | 10 |
| April | 56° | 4.9″ | 10 |
| May | 65° | 4.8″ | 12 |
| June | 74° | 4.7″ | 9 |
| July | 78° | 3.8″ | 8 |
| August | 76° | 3.6″ | 7 |
| September | 69° | 3.4″ | 7 |
| October | 58° | 2.8″ | 8 |
| November | 46° | 3.5″ | 8 |
| December | 36° | 2.8″ | 8 |
Regional context
Similar climates De Soto, MO, Briarwood Estates, MO, Lake Timberline, MO
Summer Set's climate, from NOAA NCEI 1991-2020 station normals, pairs 32°F Januarys with 78°F Julys — a 46°F swing. About 43.6 inches of precipitation falls over roughly 101 days a year.
No season owns Summer Set's rain: April reaches 4.9 inches across 10.1 days and February keeps 2.5 inches on 7.1, an even spread through Summer Set's year. That lines Summer Set up with places like De Soto, MO, Briarwood Estates, MO and Lake Timberline, MO, fed by overlapping storm tracks.
Summer Set's growing window opens around April 9, once Summer Set's overnight lows stop freezing — sow peas, lettuce, spinach, and radishes. Warm-soil crops in Summer Set wait about two weeks past Summer Set's last frost, once the soil warms. Summer Set's window closes around October 26 as Summer Set's overnight lows return below freezing. In about half of years, Summer Set's last freeze comes after April 9.
Similar climates: De Soto, MO, Briarwood Estates, MO, Lake Timberline, MO, Olympian Village, MO, Hillsboro, MO.
Frequently asked
- When does it freeze in Summer Set?
- Summer Set's last spring frost lands near April 9, and in Summer Set the first fall frost follows around October 26.
- What is the rainy season in Summer Set?
- April is the wettest month in Summer Set, about 4.9 inches on average; the year totals roughly 44 inches.
- What is the warmest month in Summer Set?
- On average July tops the year in Summer Set at about 78°F.
- What is the coldest month in Summer Set?
- The coldest stretch in Summer Set falls in January, around 32°F on average.
- When can I start a vegetable garden in Summer Set?
- In Summer Set, sow peas and hardy greens around April 9; Summer Set's tomatoes and peppers wait two weeks more.
- How many rainy days does Summer Set get?
- Summer Set averages about 101 days with measurable rain or snow each year.
- What hardiness zone is Summer Set?
- Since January in Summer Set averages 32°F, Summer Set's USDA zone follows that floor — confirm it by ZIP.
- What is the 10-day forecast for Summer Set?
- Summer Set's extended outlook — daily high and low temperatures and precipitation chances for each upcoming day — is in the daily forecast above.
- Will it rain this week in Summer Set?
- See this week's day-by-day rain chances for Summer Set in the daily forecast above, and the next 24 hours in the hourly chart.
- What is the weather like right now in Summer Set?
- Current conditions for Summer Set and the next 24 hours — temperature, precipitation chance, and wind by the hour — are in the hourly forecast chart above.
- How often is the Summer Set forecast updated?
- The Summer Set forecast on this page is built from Open-Meteo weather-model data and refreshes regularly through the day.
- When are sunrise and sunset in Summer Set?
- Today's sunrise and sunset times for Summer Set are in the Almanac section above, along with civil dawn, civil dusk, and day length. Day length is longest near the summer solstice and shortest near the winter solstice.
- How accurate is the weather forecast for Summer Set?
- The next few days in Summer Set's forecast are the most reliable; accuracy declines beyond about a week as weather-model uncertainty grows.
Summer Set sits at 38.1°N; its climate zone is humid subtropical (Köppen approximation).
ZIP codes in Summer Set
- 63020