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15-Day Weather Outlook for the St. Louis, MO Area
15-Day Weather Outlook for the St. Louis, MO Area
(As of Saturday morning, September 5, 2026 – forecasts can change, especially beyond 7–10 days. Temperatures in °F. Data drawn from National Weather Service and local forecasts.)
Current/Near-Term Highlights An Extreme Heat Warning is in effect through Saturday evening. Expect very hot conditions early in the period with heat index values potentially reaching 105–110°F on the hottest days. Stay hydrated, limit outdoor activity during peak heat, and check on vulnerable people/pets.
Day-by-Day Summary
Date
High / Low
Conditions
Precip Chance
Notes
Sat Sep 5
100–101 / 74–78
Sunny/hot
10–20%
Heat index ~108°F; light NW winds
Sun Sep 6
94–95 / 69–72
Sunny to mostly sunny
0–10%
Slightly cooler but still warm
Mon Sep 7 (Labor Day)
91–92 / 69–72
Sunny
Near 0%
Pleasant for outdoor plans
Tue Sep 8
98–99 / 76–78
Sunny/hot
Near 0%
Heat builds again
Wed Sep 9
100–101 / 76–78
Sunny/hot
0–20% (mainly night)
Another very hot day
Thu Sep 10
88–94 / 70–73
Mostly sunny, slight chance storms
20–30%
Cooler high; isolated showers possible
Fri Sep 11
89–92 / 70–75
Mostly sunny, slight chance storms
20%
Continued warm
Sat Sep 12
90–92 / 70–73
Mostly sunny
10–20%
—
Sun Sep 13
91–93 / 70–73
Mostly sunny
10–20%
—
Mon Sep 14
87–92 / 68–72
Mostly sunny
0–20%
—
Tue Sep 15
85–90 / 65–70
Mostly sunny to partly cloudy
10–20%
Gradual cooling trend
Wed Sep 16
83–88 / 63–68
Partly cloudy, chance of showers
20–40%
Increasing shower chances
Thu Sep 17
82–87 / 62–67
Partly cloudy, chance of showers
20–40%
—
Fri Sep 18
81–86 / 62–66
Partly cloudy
10–30%
More seasonal feel
Sat Sep 19
80–85 / 60–65
Partly cloudy to mostly sunny
10–30%
Longer-range outlook
Export to Sheets
Overall Pattern
Early period (Sep 5–9): Hot and mostly dry with abundant sunshine. Highs frequently in the upper 90s to low 100s.
Mid-period (Sep 10–14): Still warm (upper 80s to low 90s) with a few more opportunities for isolated showers or thunderstorms, mainly in the afternoons/evenings.
Later period (Sep 15–19): Temperatures trend closer to seasonal averages (low-to-mid 80s highs). Slightly higher chances of showers as weather systems become more active, but no major prolonged rain event is currently indicated.
Winds will generally stay light to moderate (5–10 mph). Humidity will be noticeable during the hottest days, making it feel even warmer.
For the most up-to-date details, hourly forecasts, radar, or any new alerts, check the National Weather Service St. Louis office or a trusted local source. Have a great (and safe) stretch of early September weather!
5-Day Skywatching Forecast for the St. Louis, MO Area
(September 5–19, 2026) St. Louis has moderate light pollution, so the best views come from darker suburban or rural spots (e.g., parks west or south of the city). Weather will generally favor viewing early in the period (mostly clear skies), with increasing chances of clouds or showers later. Check real-time conditions and apps like Stellarium, SkySafari, or Heavens-Above for exact timings.
Moon Phases & Impact on Dark Skies
Sep 5–9: Waning crescent (starts ~30–36% illuminated and shrinks). Moon rises later in the night/early morning, so evenings stay relatively dark.
Sep 10–11: New Moon (near or at 0% illumination) — best dark-sky window of the period for deep-sky objects, Milky Way, and faint meteors.
Sep 12–18: Waxing crescent growing to First Quarter (~Sep 18). Evenings gradually brighten with the Moon, but early evenings remain usable.
Sep 19: Moon is a thicker waxing crescent; good for lunar observing (International Observe the Moon Night falls around this date).
Moonrise/set times shift daily (roughly rising later each day early on, then earlier after New Moon). Exact times available via timeanddate.com or similar for St. Louis.
Planets Visible
Venus — Brilliant “Evening Star” (magnitude around –4.4). Low in the western sky after sunset; sets roughly 1–1.5 hours after the Sun early in the period. Easy naked-eye target.
Saturn — Excellent overnight. Rises in the evening (around 8:40–9 PM early on) in the east/southeast, highest in the south after midnight. Magnitude ~0.4; rings visible in a small telescope. Titan (its brightest moon) is close to the planet around Sep 5–6.
Jupiter — Bright morning planet (magnitude ~–1.7 to –1.9). Rises in the northeast before dawn (around 4 AM early, earlier later).
Mars — Morning sky (magnitude ~1.2). Rises after midnight/early morning in the northeast.
Mercury — Near the Sun; generally poor or daytime visibility.
Fainter: Uranus and Neptune require binoculars/telescope (Neptune approaches opposition later in the month).
Notable conjunctions:
Thin crescent Moon near Mars around Sep 6–7 (pre-dawn).
Crescent Moon near Jupiter around Sep 8 (pre-dawn).
Crescent Moon near Venus around mid-month (evening).
Meteor Showers
September ε-Perseids (Epsilon Perseids): Active roughly Sep 5–21. Peak around Sep 9–10 under excellent dark (near-New Moon) skies. Modest rates (typically 5–10 meteors per hour under ideal conditions). Fast meteors from the constellation Perseus. Best after midnight looking northeast/east, away from city lights.
Residual activity possible from the Aurigids early on (minor).
No major showers peak in this exact window, but the dark skies around New Moon help any sporadic meteors.
Other Highlights
ISS passes: Several visible passes expected in the coming nights (often pre-dawn or evening). Brightness can reach magnitude –2 or better. Check Heavens-Above or ISS Detector apps for exact St. Louis times and paths (they change daily).
Deep-sky: Around New Moon (Sep 10–14 window), try for the Andromeda Galaxy (naked-eye or binoculars from dark sites), star clusters, and the summer Milky Way fading into autumn constellations.
Stars: Bright summer stars still visible early evening (Vega, Altair, Deneb of the Summer Triangle); autumn constellations rising later.
Viewing Tips for St. Louis
Best times: After full darkness (roughly 9–10 PM early in the period, earlier later) until moonrise or dawn.
Face away from downtown lights. Parks, rural areas, or higher ground help.
Binoculars enhance planets, clusters, and the Moon; a small telescope reveals Saturn’s rings and more.
Weather note: Early period looks mostly clear and excellent for viewing. Later days have higher chances of clouds or showers—monitor forecasts.
Clear skies and happy observing! For precise hourly rise/set or real-time maps, use free apps or sites tailored to your exact location.
Lunar eclipse looked something like this August 27–28, 2026.
The next lunar eclipse visible from the St. Louis area will be the penumbral lunar eclipse on February 20, 2027
The name Jupiter comes from Latin Iuppiter (or Iūpiter), the name of the king of the Roman gods — the god of the sky, thunder, and lightning (equivalent to the Greek Zeus).
Etymology
Etymology
It derives from a compound in Proto-Italic and earlier Proto-Indo-European roots:
Dyeu- (or dyeu-pəter): Meaning "to shine" or "sky/daylight," which also gives us words related to "god," "day," and "heaven" (cognate with Greek Zeus and Dios).
Pater: Meaning "father."
So, Jupiter essentially means "Sky Father," "God-Father," or "Father of the Gods/Heaven." It was originally a vocative form (like calling out "O Father Sky!") used in prayers.
Context
Context
As a god: Jupiter (also called Jove) was the supreme deity in Roman mythology, associated with power, justice, and the heavens.
As a planet: The Romans named the largest planet after their chief god because it was the brightest "wandering star" in the night sky, symbolizing majesty and power.
Modern Usage
Modern Usage
Today, Jupiter is also used as a bold, gender-neutral given name (more recently popular for girls, partly due to its similarity to Juniper), directly referencing the god or planet and evoking strength and grandeur.
In short, it's a very ancient name rooted in Indo-European sky-god worship, symbolizing divine fatherly authority.
Our Solar System Explained
Name: The Solar System (or Sol System).
Our star is named Sol (hence "Solar"). We don’t usually give it a fancier proper name like “Alpha Centauri System” — it’s just the Solar System. It includes the Sun, 8 planets, dwarf planets (like Pluto), moons, asteroids, comets, etc.
The Alpha Centauri system is approximately 4.34–4.37 light-years away from Earth.
Breakdown:
Alpha Centauri A and B (the two brighter stars that appear as one to the naked eye): ~4.344 light-years (about 1.33 parsecs).
en.wikipedia.orgProxima Centauri (the faint red dwarf, component C, and the closest individual star to our Sun): ~4.2465 light-years.
en.wikipedia.org
This makes the Alpha Centauri triple-star system our nearest stellar neighbor beyond the Sun.
Our Galaxy
Name: The Milky Way (or Milky Way Galaxy).
It’s a barred spiral galaxy containing 100–400 billion stars. The name comes from its glowing band of light visible across the night sky, which looks like spilled milk. We live about 26,000 light-years from the center.
Black Hole at the Center of Our Galaxy?
Yes — there is a supermassive black hole at the exact center of the Milky Way.
The Black Hole is Named: Sagittarius A* (pronounced “Sagittarius A-star” and often abbreviated Sgr A*).
Mass: Roughly 4 million times the mass of our Sun.
Distance from Earth: About 26,000 light-years.
It was imaged for the first time in 2022 by the Event Horizon Telescope team (the same group that imaged the black hole in M87).
It’s relatively quiet right now (not actively devouring huge amounts of material), which is good for us!
Our Universe
Name: Simply the Universe (or the Observable Universe).
There isn’t a fancy proper name like “Milky Way.” The observable universe is the part we can see (about 93 billion light-years across), but the entire universe may be much larger or even infinite. Some people informally call it “the Cosmos,” but that’s more poetic than official.
These names are standard across astronomy. The Milky Way and Sagittarius A* are especially fun to observe or read about — on dark nights far from city lights, you can actually see the Milky Way’s glow stretching across the sky.
Cresent moon less than 50 percent illuminated.
Gibbous moon more than 50 percent illuminated.
Did groundhog see its shadow?
Yes, Punxsutawney Phil (the most famous groundhog) did see his shadow on February 2, 2026.
According to the official announcement from the Punxsutawney Groundhog Club and multiple reports, he emerged at Gobbler's Knob in Pennsylvania around 7:25 a.m. under clear skies and low temperatures (around -3°F), spotted his shadow, and predicted six more weeks of winter.
This is the traditional outcome:
Shadow seen → more winter
No shadow → early spring
Phil has now seen his shadow 110 times in recorded history (with this being a very common prediction for him—he's favored winter far more often than spring).
Note that other regional groundhogs sometimes disagree (e.g., Woodstock Willie or Buckeye Chuck predicted early spring in some reports), but Punxsutawney Phil is the classic one everyone asks about.
Buckle up for a bit more cold weather, according to the rodent oracle!
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