Frederick weather in September 2025

Expect 79°F daytime maximum temperatures in the shade with on average 7 hours of sunshine per day in Frederick in September. Check more long-term weather averages for Frederick in September before you book your next holiday to Maryland in 2025/2026.

  • 79°F maximum daytime temperature in September in Frederick79
    79°F max day temperature
  • 7 hours of sunshine per day
  • 8 days with some rainfall in September in Frederick8
    8 days with some rainfall
  • 55°F minimum night-time temperature in September in Frederick55
    55°F min night temperature
  • 12 hours of daylight per day in September in Frederick12
    12 hours of daylight per day
  • Low heat & humidity in September in FrederickL
    Low heat & humidity
  • 3.5 inches monthly rainfall in September in Frederick3.5
    3.5 inches of monthly rainfall
  • UV (maximum) index 7 (High) in September in Frederick7
    7 (High) UV index

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The September weather guide for Maryland (Frederick) 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)

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How hot is it in Frederick in September?

Daytime temperatures usually reach 79°F in Frederick in September with low heat and humidity, falling to 55°F at night.

How sunny is it in Frederick in September?

There are normally 7 hours of bright sunshine each day in Frederick in September - that's 59% of daylight hours.

Does it rain in Frederick in September?

There are usually 8 days with some rain in Frederick in September and the average monthly rainfall is 3.5 inches.

What is the chance of a hurricane in Frederick in September?

On average less than 1 day in September in Frederick is likely to be affected by the passage of one or more tropical storms.

Frederick September sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:38 18:40
Monday, 15th September 2025 05:51 18:18
Tuesday, 30th September 2025 06:05 17:53

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