The highest day temperature in September 2025 was 82°F. The lowest night temperature was 66°F. The average values for day and night temperatures during September were 76.3°F и 67.5°F respectivly.

Most of the days in September are gloomy but you can also expect sunny days.

Precipitation total in September for Copan is 13.3 in. It makes september the most rainy month of the year.

The average wind speed in September is 3.1 mph. This value is relatively stable throughout the year.

We are using day length and cloud cover information for each day of the month to calculate averages for this chart. Average sunny hours for Copan in September is 4.5 hours.