There’s big action along the 5th house/11th house axis of your chart in September. The fifth house, where the sun and Mercury in Virgo are hanging out, has to do with fun, love, kids, play, etc. The 11th house, where Jupiter and Uranus are electrifying things, has more to do with goals and strategies for achieving them. Having fun is important in the short term, but connecting with others to move your goals forward is more important in the long term.
Jupiter is actually in Aries until the 9th, and this position in your chart symbolizes spiritual courage. So the progression goes from bulking up your spiritual courage to taking that courage and applying it to your goals.
Mars also changes signs this month. He spends the first half of the month in Libra in your job sector. Mars in Libra in your solar chart encourages aggressive action on the job, which is part of a longer, ongoing obsession that your chart has with your work in general (thanks mostly to Saturn).
On the 14th, Mars moves into Scorpio and your 7th house. The 7th house pertains to things like committed relationships, but it also represents things like legal proceedings and disputes. Scorpio as a sign relates to joint finances and anything that has to do with 2 or more people with a joint interest in a contractual matter. If any of those circumstances apply to you, prepare for action on those fronts. Mars is a bit of a daredevil, so watch out for recklessness, either on your part or a partner’s.