September brings cooler temperatures to Cape Cod Beach, but the weather is still pleasant for swimming, sunbathing, and beach activities. Water sports like snorkeling, diving, surfing, windsurfing, and kitesurfing are still enjoyable, but wetsuits may be needed as the water begins to cool down. Also consider one of our other suggestions for September.
September sees a decrease in beach crowds as schools resume and the summer season comes to an end. However, the weather remains warm, with temperatures ranging from 54°F (12°C) to 71°F (22°C), making it an enjoyable time for those who prefer a less crowded beach experience. Labor Day weekend can still be quite busy, but overall, the crowds begin to diminish in September.
The average maximum temperature in Cape Cod Beach in September is 22°. The average maximum temperature is 25° in the previous month and 17° in the next month.
The average temperature in Cape Cod Beach in September is 18°. The average temperature ranges is 21° in the previous month and 13° in the next month.
The average minimum temperature in Cape Cod Beach in September is 15°. The minimum temperature is 18° in the previous month and 10° in the next month.
The average day light hours per day in Cape Cod Beach in September are 12.5 and there are 5.9 hours of sunshine per day on average during September making it a sunny month that is overcast at times.
The ultraviolet index in Cape Cod Beach in September is typically 6.3 during September. An ultraviolet index reading of 6 to 7 indicates a high risk of harm from unprotected sun exposure. Unprotected skin risks burning in less than 20 minutes. Protection against skin and eye damage is needed. Tanning will be safest before 10am and after 4pm. For those with sensitive skin stay in the shade and wear protective clothing, a wide-brimmed hat, and UV-blocking sunglasses. Generously apply broad spectrum SPF 30+ sunscreen every 2 hours, even on cloudy days. Watch out for relections from water that may increase ultraviolet exposure.
The average sea water temperature in Cape Cod Beach in September is 22.3° which is warm and pleasant for relaxing and swimming for long periods.
The average total rainfall in Cape Cod Beach in September is 8.6cm and on average there are 13.5 rainy days in September making it a slightly wet time to visit the beach.
The maximum dew point (an indicator of humidity) in Cape Cod Beach in September is 17° which is OK for most but slightly uncomfortable for some. The dew point is 19° in the previous month and 12° in the next month.
The average maximum relative humidity in Cape Cod Beach in September is typically 92.9%. The maximum relative humidity is 93.9% in the previous month and 91.4% in the next month.
The average relative humidity in Cape Cod Beach in September is typically 78.6%. The average relative humidity is 79.9% in the previous month and 77.6% in the next month.
The average maximum wind speed in Cape Cod Beach in September is typically 20kmh. The average maximum wind speed is 18kmh in the previous month and 21kmh in the next month.
The average wind speed in Cape Cod Beach in September is typically 10kmh. The average wind speed is 9kmh in the previous month and 11kmh in the next month.
The average wind direction in Cape Cod Beach in September is from the South West.
