Temperature
56 F at 12 PM; 81 F at its warmest, 4 PM Thursday, and 51 F at its coolest, 8 AM.
- Now
- 56F
- 12 PM
- Highest
- 81F
- 4 PM Thursday
- Lowest
- 51F
- 8 AM
How it is measured: Stevenson screen and siting, Field Book FB-INS-009
St Louis Downtown Airport, Illinois
Small airport in St. Clair County, Illinois55°
58°/44°
Overcast·
Feels like 55°·Moderate breeze 16 mph NW
Now. St Louis Downtown Airport is 55° and overcast at 1 PM. The dew point is 39°, so the air feels dry and comfortable. Moderate breeze from the northwest at 16 mph, gusting to 29 mph.
Today and tonight. It warms to about 57° by 3 PM. Tonight falls to about 40° by 7 AM, under a mostly clear sky. No rain is expected for the rest of the day.
The week. The warmest day ahead is Thursday, near 79°, and the coolest tomorrow, near 60°. The days ahead look dry. Frost is possible Sunday morning, a low of 33°.
The sky tonight. The sun sets at 6:21 PM. The Moon is a waxing crescent, 33% lit, and sets at 10:21 PM. The next full Moon is Sunday, Oct 25. After dark, look for Saturn, bright in the east-southeast. A planet shines with a steady light where the stars around it twinkle. The Orionids meteor shower is active, peaking around Oct 21: at its peak, up to about 20 meteors an hour can be seen from a dark site. The sky is forecast to stay clear: a good night to look up. The day is 11 hours 12 minutes long, 2 minutes shorter than yesterday.
4UV Moderate
24Air quality
53%Humidity
98%Cloud
Now
1:00 PM
55feels55
16mph
Today
Oct 16
5844
21%
16mph
Sat
Oct 17
6037
clear day
Sun
Oct 18
6633
clear day
Mon
Oct 19
7136
clear day
Tue
Oct 20
7338
overcast
Wed
Oct 21
7640
overcast
Thu
Oct 22
7943
overcast
55°
58°44°
60°37°
66°33°
71°36°
73°38°
76°40°
79°43°
As of 1:00 PM in St Louis Downtown Airport, Illinois.
Air quality
The air at St Louis Downtown Airport
Index 24, good, led by fine particles. Read at 1 PM from its reporting area, St. Louis (Metro-east) (IL), 10 miles off.
24Good
- Fine particles (PM2.5)24Good2.9 mi
- Ozone19Good18 ppb2.9 mi
- Coarse particles (PM10)12Good6.2 mi
- Nitrogen dioxide2Good2.6 ppb6.3 mi
- Sulfur dioxide0Good0.4 ppb6.3 mi
- Carbon monoxide-0.2 ppm6.3 mi
The days ahead
Good each day through Mon Oct 19, led by fine particles. Yesterday measured 39, good.
GoodModerate
- 39YesterdayOct 15
- GoodTodayOct 16
- GoodSatOct 17
- GoodSunOct 18
- GoodMonOct 19
Smoke, the next 43 hours
No smoke near the ground through Sun 7 AM.
Precipitation
What has fallen at St Louis Downtown Airport
0.02 in in the last 24 hours, 1.50 in over the last 3 days, to Fri 12 PM. Measured by radar and rain gauges, as water.
- Last 24 hours
- 0.02in
- Last 3 days
- 1.50in
3 days agoLast 24 hours 1%
Visibility
How far you can see at St Louis Downtown Airport, the next 43 hours
Visibility stays 9 miles or more through Sun 7 AM, lowest 10 miles Sat 3 AM.
F
Now, today, and the week
Weather instrument stations by state
Airfield
- Code
- CPS
- ICAO
- KCPS
- IATA
- CPS
- Field elevation
- 413 ft
- Serves
- Cahokia/St Louis
- Kind
- Small airport
- Scheduled service
- No
- Its own instrument
- CPS
- Wind now
- From 310° at 16 mph, read 16 Oct, 12:53
Runways
| Runway | Length | Width | Surface | Heading, true | Wind along it now | Crosswind now |
|---|---|---|---|---|---|---|
| 05 / 23 unlit | 2,799 ft | 75 ft | Asphalt | 47° / 227° | 2 mph head, on 23 | 16 mph from the right |
| 12L / 30R | 5,301 ft | 75 ft | Concrete | 123° / 303° | 16 mph head, on 30R | 2 mph from the right |
| 12R / 30L | 7,002 ft | 150 ft | Asphalt | 122° / 302° | 16 mph head, on 30L | 2 mph from the right |
Measured here
What the airfield's own instrument measured, the last 24 hours
Every hour from Cahokia/St Louis (CPS), St Louis Downtown Airport's own instrument, measure by measure, on the field's own clock.
Humidity and dew point
A dew point of 39 F, the air 53% saturated; the humidity ran from 51% at 11 AM to 85% at 12 AM.
- Dew point now
- 39F
- 12 PM
- Humidity now
- 53%
- Humidity, range
- 51 to 85%
How it is measured: Humidity variables, Field Book FB-WAT-002
Wind
13 mph from the northwest at 1 PM; at its strongest 23 mph, 6 AM, with a gust of 41 mph at 11 PM Thursday.
- Now
- 13mph
- from the northwest
- Strongest
- 23mph
- 6 AM
- Highest gust
- 41mph
- 11 PM Thursday
How it is measured: Coriolis as geometry, Field Book FB-ENG-008
Pressure
30.23 inHg at 1 PM, steady over 3 hours; 0.32 inHg higher than a day before.
- Now
- 30.23inHg
- 1 PM
- 3 hours
- -0.01inHg
- steady
- 24 hours
- +0.32inHg
How it is measured: Hydrostatic balance, Field Book FB-ENG-003
Visibility
Down to 9 miles at 12 AM; 10 miles or more now.
- Now
- 10+mi
- Lowest
- 9mi
- 12 AM
- Hours under a mile
- 0
How it is measured: Fog types, Field Book FB-WAT-020
Cloud base
The lowest cloud base came down to 1,100 ft at 2 PM Thursday; a base was reported in 23 of the hours.
- Lowest base now
- 4,500ft
- Lowest in 24 hours
- 1,100ft
- 2 PM Thursday
- Hours with a base reported
- 23
How it is measured: Cloud classification, Field Book FB-SKY-001
Precipitation
None measured in the gauge in the last 24 hours.
- Last 24 hours
- 0.00in
- Wettest hour
- 0.00in
- 5 PM Thursday
- Hours with some
- 6
How it is measured: ASOS, Field Book FB-INS-002
Cahokia/St Louis: every reading, the last 7 days, 30 days and the year, and how well it reports
What is measuring near here
The 5 instruments nearest St Louis Downtown Airport, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 0.0 miles away.
measured now3 instruments
At an airfield/0.0 mi away/413 ft/level with here
temp, wind, gust, visibility, precip, pressure
- 55/64/70 @ Poplar St. BridgeSS0234
Beside a road/3.3 mi away/-/- ft from here
temp, pavement temp, wind, visibility, precip
Mississippi River AT Mel Price LDALNI2
At a river or reservoir gauge/21.6 mi away/394 ft/19 ft below here
temp, wind, gust, humidity, pressure
measured daily2 instruments
East St. Louis 1.3 NWIL-SC-36
In a volunteer observer's own ground/4.1 mi away/423 ft/10 ft above here
precip, snowfall, snow depth
Milstadt 2SWMSTI2
At a cooperative observer's station/9.0 mi away/656 ft/243 ft above here
snowfall, snow depth, precip, high, low
What the snow tracker reads here
Every instrument in this state
0in
Snow on the ground
Measured at Mississippi River AT Mel Price LD (ALNI2), 21.6 miles from here, read 16 Oct, 05:00. measured daily
Elsewhere in Illinois
23 places, each with its own forecast and its own instruments.
AuroracityBloomingtoncityCarbondalecityChampaigncityChicagocityDanvillecityDecaturcityElgincityGalenatownIllinois RiverfeatureJolietcityLake ShelbyvillefeatureMolinecityMount VernoncityNapervillecityPeoriacityQuincycityRockfordcityShawnee National ForestfeatureSpringfieldcityStarved RockfeatureVilla Oliviaski areaWaukegancity
Near St Louis Downtown Airport
The nearest places, each with its own forecast and the instruments nearest it.
- Cahokia Heightscity, under 1 mi
- Saugetvillage, 1 mi
- East St. Louiscity, 4 mi
- Dupovillage, 4 mi
- East Carondeletvillage, 5 mi
- Washington Parkvillage, 5 mi
- Brooklynvillage, 6 mi
- Fairmont Cityvillage, 6 mi
- Venicecity, 7 mi
- Madisoncity, 8 mi
- Caseyvillevillage, 8 mi
- Millstadtvillage, 8 mi
Airports near St Louis Downtown Airport
- Scott AFB/Midamerica AirportBLV, 17 mi
- St Louis Regional AirportALN, 23 mi
- Sparta Community Airport - Hunter FieldSAR, 38 mi
- Litchfield Municipal Airport3LF, 48 mi
- Centralia Municipal AirportENL, 58 mi
- Salem-Leckrone AirportSLO, 65 mi
- Mount Vernon Outland AirportMVN, 72 mi
- Southern Illinois AirportMDH, 74 mi