Mammoth Cave weather in September 2025

Expect 81°F daytime maximum temperatures in the shade with on average 8 hours of sunshine per day in Mammoth Cave in September. Check more long-term weather averages for Mammoth Cave in September before you book your next holiday to Kentucky in 2025/2026.

  • 81°F maximum daytime temperature in September in Mammoth Cave81
    81°F max day temperature
  • 8 hours of sunshine per day
  • 8 days with some rainfall in September in Mammoth Cave8
    8 days with some rainfall
  • 57°F minimum night-time temperature in September in Mammoth Cave57
    57°F min night temperature
  • 12 hours of daylight per day in September in Mammoth Cave12
    12 hours of daylight per day
  • Low heat & humidity in September in Mammoth CaveL
    Low heat & humidity
  • 3.7 inches monthly rainfall in September in Mammoth Cave3.7
    3.7 inches of monthly rainfall
  • UV (maximum) index 7 (High) in September in Mammoth Cave7
    7 (High) UV index

More about Mammoth Cave

Mammoth Cave by month

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

Recommended for Kentucky

Cosmos: up to £200 off USA & Canada tours

  • Save up to £200 per couple on USA & Canada escorted tours
  • Book tours to southern USA & national parks in 2024
  • Travel before 31st December 2024 (inclusive)
Go to Cosmos deal >>

Expires at 23:59 on Tuesday 31st Dec 2024 · View all Cosmos offers

The September weather guide for Kentucky (Mammoth Cave) 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 Mammoth Cave in September?

Daytime temperatures usually reach 81°F in Mammoth Cave in September with low heat and humidity, falling to 57°F at night.

How sunny is it in Mammoth Cave in September?

There are normally 8 hours of bright sunshine each day in Mammoth Cave in September - that's 61% of daylight hours.

Does it rain in Mammoth Cave in September?

There are usually 8 days with some rain in Mammoth Cave in September and the average monthly rainfall is 3.7 inches.

Mammoth Cave September sunrise & sunset times

Browse the sunrise and sunset times for Mammoth Cave in September 2025. Select a month to view Mammoth Cave sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:15 18:13
Monday, 15th September 2025 05:27 17:52
Tuesday, 30th September 2025 05:39 17:29

Related posts

Popular travel offers

Explore holidays in the sun for less

More holidays

Airport parking

More parking

Airport lounges

More lounges

Top ^