Atlanta  Weather in September

By: Loan Budy

The month of September in Atlanta experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 35% throughout the month. The clearest day of the month is September 21, with clear, mostly clear, or partly cloudy conditions 66% of the time.

The average daily high temperature in Atlanta in September is 82°F (28°C). The average daily low is 64°F (18°C). Especially in recent years, it is not very common to see daily highs below 80°F (27°C), particularly at the beginning of the month when temperatures are often still as high as during the summer months.

The weather in September is still warm and balmy, making it one of the best times to visit some outdoor attractions. Situated between the Upper West and Upper East Sides of Manhattan, Central Park is easily accessible and offers a wide array of fun activities.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Atlanta, the chance of a wet day over the course of September is rapidly decreasing, starting the month at 31% and ending it at 23%. For reference, the year's highest daily chance of a wet day is 45% on July 9, and its lowest chance is 19% on October 29.

Growing degree days are a measure of yearly heat accumulation used to predict plant and animal development, and defined as the integral of warmth above a base temperature, discarding any excess above a maximum temperature. In this report, we use a base of 50°F and a cap of 86°F. The average accumulated growing degree days in Atlanta are rapidly increasing during September, increasing by 641°F, from 3,877°F to 4,518°F, over the course of the month.

The month of September in Atlanta experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 35% throughout the month. The clearest day of the month is September 21, with clear, mostly clear, or partly cloudy conditions 66% of the time.

September is generally a good time of year to visit the city, with plenty of sun and slightly smaller crowds now the schools are back in session. On the hotter days, it can still be best to confine more active sightseeing or strenuous hiking to the earlier, cooler parts of the day.

September in Atlanta is usually a very sunny month, with completely clear or mostly sunny weather on most days through the month. Sometimes there may be a cloudy morning or afternoon, and while afternoon rain showers and thunderstorms are still quite possible at this time of year, they are not as frequent as during the peak of summer.

Weather in Atlanta in September varies, from the intense heat and humidity of summer, especially in the earlier weeks of the month, and cooler weather more typical of fall. The average daily high is 82°F (28°C), although temperatures into the 90s are very common. Afternoon thunderstorms are still possible, although they are usually of short duration and are often fairly localised.

September is generally a good time of year to visit the city, with plenty of sun and slightly smaller crowds now the schools are back in session. On the hotter days, it can still be best to confine more active sightseeing or strenuous hiking to the earlier, cooler parts of the day.

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