September weather forecast
Louisiana, USA

September marks the transition from the peak summer heat to the early hints of fall in Louisiana. The southern regions of the state, encompassing areas like Baton Rouge, generally observe daytime highs between 86°F (30°C) and 90°F (32.2°C). Meanwhile, the northern regions, which include towns like Ruston, typically see temperatures ranging from 81°F (27.2°C) to 85°F (29.4°C).

Nighttimes begin to show the first subtle signs of cooling. In the southern part of the state, nighttime temperatures hover between 68°F (20°C) and 72°F (22.2°C). In contrast, the northern sections experience slightly cooler nights, with lows ranging from 63°F (17.2°C) to 67°F (19.4°C).

Rainfall begins to diminish in September, although afternoon thunderstorms with brief, heavy downpours can still be prevalent. The frequency of these storms, however, is generally reduced compared to the earlier summer months. This reduction signifies the beginning of the shift from the wet season to the drier months ahead.

In comparison to August, September typically experiences a slight decrease in both temperature and humidity, especially as the month progresses. The heat is less intense, and there is a palpable freshness in the air during early mornings and late evenings. That said, September remains within the hurricane season's window. This fact necessitates that both residents and visitors stay informed about possible tropical systems, as the state remains vulnerable to hurricanes and tropical storms during this month.

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• New Orleans - September »
  In New Orleans in September, during 11.7 rainfall days, 0.47" (12mm) of precipitation is typically accumulated. In New Orleans, in September, during 11.7 rainfall days, 0.47" (12mm) of precipitation is typically accumulated.
• Baton Rouge - September »
  On the first day of September in Baton Rouge sunrise is at 6:41 am and sunset at 7:27 pm. In Baton Rouge, during September, the rain falls for 17.6 days and regularly aggregates up to 2.95" (75mm) of precipitation.
• Shreveport - September »
  The month with the least rainfall in Shreveport is September, when the rain falls for 9.2 days and typically collects 0.63" (16mm) of precipitation. September in Shreveport marks the gradual end of the intense summer heat.
• Lafayette - September »
  Relief from the heat begins in September as Lafayette, Louisiana starts moving towards fall. On the first day of September in Lafayette sunrise is at 6:45 am and sunset at 7:30 pm.
• Lake Charles - September »
  In September, in Lake Charles the rain falls for 19.1 days. On the last day of September, in Lake Charles, sunrise is at 7:06 am and sunset at 6:59 pm CDT.
• Kenner - September »
  On the first day of September in Kenner, sunrise is at 6:38 am and sunset at 7:23 pm. In Kenner, in September, it is raining for 17 days, with typically 3.82" (97mm) of accumulated precipitation.
• Bossier City - September »
  On the first day of September in Bossier City sunrise is at 6:50 am and sunset at 7:39 pm. In Bossier City, in September, it is raining for 9.2 days, with typically 0.63" (16mm) of accumulated precipitation.
• Monroe - September »
  The month with the least rainfall in Monroe is September, when the rain falls for 11.6 days and typically collects 1.5" (38mm) of precipitation. The month with the least rainfall in Monroe is September, when the rain falls for 11.6 days and typically collects 1.5" (38mm) of precipitation.
• Alexandria - September »
  September brings a noticeable dip in temperature from the heat of August, marking the inception of cooler weather in Alexandria, Louisiana. In Alexandria in September, it is raining for 14.8 days, with typically 2.44" (62mm) of accumulated precipitation.
• Houma - September »
  In Houma in September, it is raining for 15.1 days, with typically 1.34" (34mm) of accumulated precipitation. The average relative humidity in September in Houma is 77%.
• New Iberia - September »
  On the first day of September in New Iberia sunrise is at 6:44 am and sunset at 7:29 pm. On the first day of September in New Iberia sunrise is at 6:44 am and sunset at 7:29 pm.
• Slidell - September »
  An average temperature of 73.4°F (23°C) marks the nights in Slidell in September. In Slidell, Louisiana, the average relative humidity in September is 75%.