St Louis weather in August 2025

Expect 88°F daytime maximum temperatures in the shade with on average 9 hours of sunshine per day in St Louis in August. Check more long-term weather averages for St Louis in August before you book your next holiday to Missouri in 2025/2026.

  • 88°F maximum daytime temperature in August in St Louis88
    88°F max day temperature
  • 9 hours of sunshine per day
  • 8 days with some rainfall in August in St Louis8
    8 days with some rainfall
  • 66°F minimum night-time temperature in August in St Louis66
    66°F min night temperature
  • 14 hours of daylight per day in August in St Louis14
    14 hours of daylight per day
  • High heat & humidity in August in St LouisH
    High heat & humidity
  • 3.0 inches monthly rainfall in August in St Louis3.0
    3.0 inches of monthly rainfall
  • UV (maximum) index 9 (Very High) in August in St Louis9
    9 (Very High) UV index

More about St Louis

St Louis by month

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Recommended for Missouri

Argus Car Hire: Compare low prices on car hire

  • Compare car hire with popular rental companies
  • Book with no credit card fees & free cancellation policy
  • Find low prices based on destination & travel dates
Go to Argus Car Hire deal >>

View all Argus Car Hire offers

The August weather guide for Missouri (St Louis) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

Metric (°C)  |  Imperial (°F)

Back to top

More about the USA

How hot is it in St Louis in August?

Daytime temperatures usually reach 88°F in St Louis in August with high heat and humidity, falling to 66°F at night.

How sunny is it in St Louis in August?

There are normally 9 hours of bright sunshine each day in St Louis in August - that's 65% of daylight hours.

Does it rain in St Louis in August?

There are usually 8 days with some rain in St Louis in August and the average monthly rainfall is 3.0 inches.

St Louis August sunrise & sunset times

Browse the sunrise and sunset times for St Louis in August 2025. Select a month to view St Louis sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Friday, 1st August 2025 05:03 19:11
Saturday, 16th August 2025 05:16 18:53
Sunday, 31st August 2025 05:29 18:32

Related posts

Popular travel offers

Explore holidays in the sun for less

More holidays

Airport parking

More parking

Airport lounges

More lounges

Top ^