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Affton weather forecast

Missouri, United States · Chicago time · 38.55°, -90.33°

Current conditions · 7:00 PM local

Current conditions in Affton

79°F

Thunderstorm

Feels like 85°F

Humidity
80%
Wind
7 mph WSW
Gusts
19 mph
UV index
1.45
Visibility
11.5 mi

Right now

Conditions in Affton at the moment: thunderstorm, 26 °C. It feels warmer than it reads, more like 29 °C. Wind is from the WSW at 11 km/h, gusting to 30 km/h. Humidity stands at 80% with sea-level pressure near 1006 hPa.

At a glance

Today

80° / 67°

Thunderstorm · rain likely (91%)

Tomorrow

72° / 62°

Overcast

Upcoming · to Saturday

96° / 59°

Highs 96°, lows 59°. The most active day looks like Saturday, when rain chances peak at 52%.

Next 3 days

Today looks like thunderstorm; temperatures run from 20 °C up to 27 °C. Rain chance peaks at 91% with around 7.1 mm possible. Gusts may reach 49 km/h from the SSW. Expect overcast tomorrow, between 16 °C and 22 °C. Expect overcast Tuesday, between 15 °C and 28 °C.

Today

Sun, Jun 21

Thunderstorm

80°67°

Rain chance
91%
Precip
0.3 in
Max wind
10 mph

Tomorrow

Mon, Jun 22

Overcast

72°62°

Rain chance
4%
Precip
0 in
Max wind
9 mph

Tuesday

Tue, Jun 23

Overcast

82°59°

Rain chance
3%
Precip
0 in
Max wind
7 mph

Next 48 hours

  1. 12 AM72°0%2 mph
  2. 1 AM70°0%4 mph
  3. 2 AM68°0%2 mph
  4. 3 AM68°0%2 mph
  5. 4 AM69°1%2 mph
  6. 5 AM68°1%3 mph
  7. 6 AM67°1%3 mph
  8. 7 AM69°1%4 mph
  9. 8 AM71°1%6 mph
  10. 9 AM74°2%8 mph
  11. 10 AM75°5%8 mph
  12. 11 AM76°14%10 mph
  13. 12 PM76°42%5 mph
  14. 1 PM75°79%10 mph
  15. 2 PM73°91%9 mph
  16. 3 PM76°69%7 mph
  17. 4 PM79°43%7 mph
  18. 5 PM80°42%10 mph
  19. 6 PM80°37%9 mph
  20. 7 PM79°29%7 mph
  21. 8 PM75°23%8 mph
  22. 9 PM74°13%4 mph
  23. 10 PM73°9%9 mph
  24. 11 PM71°6%6 mph
  25. 12 AM68°2%6 mph
  26. 1 AM65°0%8 mph
  27. 2 AM63°2%7 mph
  28. 3 AM62°0%7 mph
  29. 4 AM63°0%8 mph
  30. 5 AM62°0%9 mph
  31. 6 AM62°1%7 mph
  32. 7 AM62°1%7 mph
  33. 8 AM63°1%9 mph
  34. 9 AM64°1%5 mph
  35. 10 AM66°2%6 mph
  36. 11 AM67°2%7 mph
  37. 12 PM67°2%9 mph
  38. 1 PM69°2%8 mph
  39. 2 PM71°3%7 mph
  40. 3 PM71°3%6 mph
  41. 4 PM72°3%7 mph
  42. 5 PM69°4%3 mph
  43. 6 PM72°4%7 mph
  44. 7 PM71°4%5 mph
  45. 8 PM69°4%4 mph
  46. 9 PM67°3%4 mph
  47. 10 PM65°3%4 mph
  48. 11 PM64°3%3 mph

In depth

The weather picture for Affton opens with thunderstorm; it's 26 °C out, feeling like 29 °C. Today's forecast calls for thunderstorm, topping out near 27 °C before falling back to 20 °C overnight. Winds blow mainly from the SSW around 16 km/h, with gusts up to 49 km/h. A warming trend takes daytime highs from 22 to 35 °C over the coming week. Rain is in the picture on today, Wednesday, Thursday and beyond, with roughly 24 mm expected in total across the week. Tomorrow brings overcast with a high of 22 °C and a 4% chance of precipitation. The UV index reaches 6 today, so sun protection is sensible during the middle of the day. Sunrise comes at 05:37 and sunset at 20:28, giving 14.9 hours of daylight. Current humidity sits at 80% with pressure near 1006 hPa. Looking further out, Thursday shows thunderstorm with a high around 30 °C, while Saturday ends the week at 35 °C. Forecast details are refreshed throughout the day as new model runs arrive, so check back for the latest figures.

Air quality

46

Good

US AQI · European AQI 26

Air quality in Affton is currently good, with a US AQI of 46 (European AQI 26). The dominant pollutant right now is ozone. Air quality is healthy; no precautions needed. Fine particulate matter (PM2.5) measures 5.5 µg/m³.

Pollutants

PM2.5
5.5 µg/m³
PM10
6 µg/m³
Ozone (O₃)
64 µg/m³
NO₂
3.7 µg/m³
SO₂
1.2 µg/m³
CO
139 µg/m³
Dust
1 µg/m³

Sun & UV

Sunrise
5:37 AM
Sunset
8:28 PM
Daylight
14h 52m
Max UV
6.3 High

Wind

Wind
7 mph
Gusts
19 mph
Direction
WSW (253°)

Farming weather

Soil temperatures today read surface 21.3 °C, 6 cm 22.4 °C, 18 cm 22.7 °C, 54 cm 21.1 °C. Soil moisture sits at 0-1 cm at 0.32 m³/m³, 3-9 cm at 0.32 m³/m³, 27-81 cm at 0.29 m³/m³. For maize, the root-zone reading is within the ideal 0.2-0.35 m³/m³ band. Forecast rain (24 mm) roughly covers crop water demand (ET0 28 mm), so irrigation can likely be paused. A suitable spraying window opens around 06:00 on 2026-06-21, with winds at or below 15 km/h and no rain expected. Heat stress is likely for maize with highs reaching 35 °C (threshold 35 °C). Heat stress is likely for wheat with highs reaching 35 °C (threshold 32 °C). Projected growing degree days over the next week: maize 91, wheat 130.

Topsoil moisture
0.237 m³/m³
Soil temp
68°F
ET₀ today
2.58 mm
Spray window
~5:00
Rain (next 7d)
0.9 in
Wind
7 mph
Humidity
80%

Full farming outlook for Affton →

Advisory summary

No weather alert thresholds are crossed for Affton in the current forecast (derived from forecast data, not official warnings). Conditions may still change — check back for updates.

All data for Affton
Every forecast variable for Affton with human-readable labels
VariableValue
CityAffton, Missouri, United States
Coordinates38.55061, -90.33317
Elevation188 m
TimezoneAmerica/Chicago
Population20,307
Observed at (local)7:00 PM
Temperature (2 m)79°F
Apparent temperature85°F
Relative humidity (2 m)80%
Dew point (2 m)72°F
Precipitation (last hour)0 in
Rain0 in
Showers0 in
Snowfall0 in
Weather code (WMO)95
Cloud cover100%
Surface pressure29.1 inHg
Sea-level pressure29.7 inHg
Wind speed (10 m)7 mph
Wind gusts (10 m)19 mph
Wind direction (10 m)253° (WSW)
Visibility11.5 mi
UV index1.45
Day / nightDay
Today max / min80°F / 67°F
Today feels-like max / min85°F / 70°F
Today precipitation sum0.3 in
Today rain sum0.3 in
Today snowfall sum0 in
Today max precip probability91%
Today max wind / gusts10 mph / 31 mph
Dominant wind direction196° (SSW)
Sunrise / sunset5:37 AM / 8:28 PM
Daylight duration14h 52m
Sunshine duration4h 56m
Max UV index6.3
Reference evapotranspiration (ET₀)2.58 mm
Topsoil moisture (0–1 cm)0.237 m³/m³
Surface soil temperature68°F
US AQI46
European AQI26
PM2.55.5 µg/m³
PM106 µg/m³
Ozone (O₃)64 µg/m³
Nitrogen dioxide (NO₂)3.7 µg/m³
Sulphur dioxide (SO₂)1.2 µg/m³
Carbon monoxide (CO)139 µg/m³
Dust1 µg/m³

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Frequently asked questions

Will it rain in Affton tomorrow?

Rain is unlikely in Affton tomorrow; the precipitation chance stays around 4%.

What is the temperature in Affton today?

Today Affton sees thunderstorm with a high of 27 °C and a low of 20 °C.

How hot will it be in Affton tomorrow?

Tomorrow's high in Affton is forecast at 22 °C with overcast.

Is it windy in Affton today?

Yes, yes — gusts up to 49 km/h today.

What is the UV index in Affton today?

The UV index peaks at 6 today, which is high.

What time is sunrise and sunset in Affton today?

The sun rises at 05:37 and sets at 20:28 local time.

Is the air quality in Affton good today?

Air quality is good right now, with a US AQI reading of 46.