Hotter-than-average forecast for summer across Louisiana
The National Oceanic and Atmospheric Administration (NOAA) has issued a seasonal outlook calling for above-average temperatures across the United States, with Louisiana at the center of intense early heat. This summer is shaping up to be particularly harsh across the Deep South, with the Crescent City already breaking into dangerous territory.
Extreme heat hits New Orleans with 110°F (43°C) heat index
On Saturday, June 7, New Orleans faced its first official heat advisory of the season, marked by an air temperature of 95°F (35°C) and a heat index soaring to 110°F (43°C). According to the National Weather Service in Slidell, this heat index reflects the combined effect of temperature and humidity, giving a more realistic sense of how the heat is perceived by the human body.
This week, temperatures in New Orleans are expected to hover in the upper 80s to low 90s°F (31–33°C). However, due to persistent cloud cover and extreme humidity, the “feels like” temperature is forecast to remain dangerously high — around 108°F (42°C).
Louisiana enters its hottest stretch earlier than usual
Historically, July and August are the hottest months in Louisiana, with highs commonly topping 90°F (32°C). But June 2025 has already delivered record-breaking conditions, raising concerns about heat-related illnesses and the strain on power infrastructure. New Orleans is particularly vulnerable as one of the nation’s most severe urban heat islands, with its dense infrastructure intensifying the heat experienced within the city compared to surrounding areas.
Forecast: Long, humid, and hazardous summer ahead
This summer, highs in the 90s°F (32–37°C) will likely feel even hotter due to humidity-driven heat indices that are expected to reach or exceed 100°F (38°C) statewide. The National Weather Service notes that in Louisiana’s humid subtropical climate, relative humidity levels of 89% to 92% during June through August significantly reduce the body’s ability to cool itself, exacerbating the impact of the heat.
The average heat index in Louisiana during summer ranges from the high 80s°F (31°C) to the mid-90s°F (35°C). However, 2025’s projections suggest that triple-digit heat indices will become a recurring challenge throughout the season.
Health risks spike as heat indices climb
According to the National Weather Service, when the heat index exceeds 90°F (32°C), the risk of heat-related illnesses such as heat cramps, heat exhaustion, and potentially heat stroke increases sharply. The body’s cooling mechanisms become less effective, particularly in high humidity, making prolonged outdoor exposure dangerous.
The combination of persistent heat, record humidity, and urban heat island effects means New Orleans and broader South Louisiana must prepare for a brutal and potentially record-setting summer.
