Oklahoma Heat Returns Before Possible Late-September Cooldown
Oklahoma Heat Returns This Weekend Before Signs of Fall Emerge Later in September
A brief break from Oklahoma's intense summer heat is coming to an end, with temperatures climbing back into the 90s this weekend and heat index values again approaching triple digits.
The Oklahoma September heat forecast calls for another stretch of hot, mostly dry weather through the middle of next week. However, longer-range forecasts are beginning to show signs of a more significant pattern change later in September that could finally bring cooler temperatures to the state.
The renewed heat follows a slow-moving front that brought scattered rain and temporarily ended the recent run of triple-digit temperatures across Oklahoma.
Oklahoma September Heat Forecast Brings 90s Back This Weekend
Temperatures will rebound quickly Friday and Saturday, with afternoon highs expected to reach the low to mid-90s across much of Oklahoma.
Humidity will make it feel even hotter. Afternoon heat index values could climb into the upper 90s and potentially reach 100 to 103 degrees in some areas, particularly where moisture remains higher following this week's rain.
The National Weather Service advises that the heat index combines air temperature and relative humidity to estimate how hot conditions feel to the human body. When temperatures and humidity rise together, the body's ability to cool itself through evaporation becomes less effective, increasing the risk of heat-related illness. The National Weather Service heat safety guidance recommends limiting strenuous outdoor activity during the hottest part of the day, staying hydrated and never leaving children or pets inside vehicles.
The weekend will not be completely rain-free. Isolated showers and thunderstorms remain possible, particularly across eastern and southern Oklahoma, although widespread rainfall is not expected.
Any storms that develop could briefly cool temperatures locally, but most of the state will remain hot through the weekend.
Hot and Mostly Dry Pattern Expected Through Middle of September
The summer-like pattern is expected to continue into next week as high pressure strengthens over the region.
From roughly September 14 through September 17, daytime temperatures are expected to remain in the 90s, with many locations reaching approximately 93 to 95 degrees. Overnight temperatures should generally fall into the low to mid-70s.
Rain chances are also expected to decrease as the ridge builds, creating several days of mostly sunny, stable and dry weather.
That continued heat is notable even by Oklahoma's September standards. Normal temperatures gradually decline during the month as the state moves toward fall, although significant year-to-year variations are common. Historical climate records available through the Oklahoma Climatological Survey show the state's transition from summer to fall can include substantial swings between periods of late-season heat and much cooler conditions.
For areas that received beneficial rain this week, another prolonged stretch of sunshine and temperatures in the 90s could also quickly begin drying soils and vegetation again.
The National Weather Service recommends continuing summer heat precautions during unusually warm September weather, particularly for people working or exercising outdoors during the afternoon.
Long-Range Forecast Shows Potential Fall Change Later in September
A more substantial weather change could begin developing during the second half of September.
Long-range forecast models have indicated the potential for a stronger cold front around September 19 or 20, which could bring a significant drop in temperatures along with renewed chances for rain and thunderstorms.
Current projections suggest temperatures behind that system could fall by roughly 15 degrees, potentially bringing daytime highs into the upper 70s and lower 80s in parts of Oklahoma.
Because the possible front remains more than a week away, its exact timing, rainfall coverage and eventual temperature drop remain uncertain and could change as newer forecast data becomes available.
The broader outlook can be tracked through the National Weather Service Climate Prediction Center, which issues updated 6-to-10-day and 8-to-14-day temperature and precipitation outlooks for Oklahoma and the rest of the country.
For now, Oklahoma's brief preview of cooler weather is ending. Temperatures in the 90s return this weekend and are expected to stick around through much of next week, meaning summer is not finished with the state just yet.
But the first stronger signs of Oklahoma's eventual transition toward fall are beginning to appear in the longer-range forecast.
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