France’s 2026 grain-maize yield is forecast to fall to 6.3 tonnes per hectare (2.81 short tons per acre), its lowest level since 1991, after repeated heatwaves and persistent drought damaged crops. Agreste estimates production, including seed maize, at 7.3 million tonnes (8 million short tons), nearly half the 2025 level, as grain-maize area fell 28% and yield declined 27%.
Five daily high-temperature records were broken and one was tied at six sites across Kansas, Oklahoma, Missouri and Illinois on October 13, 2026. Temperatures at the sites reached 32.8–33.9°C (91–93°F), or 9.4–13.3°C (17–24°F) above normal, following the warmest September on record for the contiguous United States.
Extreme Heat Warnings and Heat Advisories covered a broad section of California on October 5, 2026, as potentially record-breaking early-October heat persisted from Southern California to the Bay Area, Central Valley and northern interior. Forecast highs reached 41°C (106°F) in inland Los Angeles and Ventura counties and 43°C (110°F) in Death Valley, while unusually warm nights limited relief. Most alerts remained in effect through October 7 or 8, with the Death Valley warning continuing through October 9.
A long-duration October heat wave is affecting California under an anomalous ridge over the western United States, with Heat Advisories and Extreme Heat Warnings in effect from Northern and Central California into Southern California. The NOAA/NWS Weather Prediction Center (WPC) forecasts October 3 as the hottest day of the short-range period, with temperatures about 8–11°C (15–20°F) above normal and some valleys reaching approximately 42°C (107°F).
Late-season heat affected southern China from September 25 into early October 2026, with official reports placing temperatures at 39.5°C (103.1°F) in Qiaojia, Yunnan, 39.1°C (102.4°F) in Yongding, Fujian, and 38.0°C (100.4°F) in Guangxin, Jiangxi. An independent analysis of station data identified 62 October maximum-temperature records on October 1 and another 18 on October 2, although Chinese meteorological authorities have not published an equivalent record count.
Heat Advisories issued by 16 National Weather Service (NWS) forecast offices cover portions of 12 U.S. states from September 14 through September 16, 2026, with heat index values forecast to reach 46°C (114°F) in southern Texas. The advisories extend from Texas and Oklahoma through the Lower Mississippi Valley and Mid-South into Indiana and Kentucky.
The National Weather Service (NWS) issued Heat Advisories for parts of Arkansas, northern Mississippi and western Tennessee from 11:00 to 20:00 CDT on September 10, 2026 (16:00 UTC on September 10 to 01:00 UTC on September 11). Heat-index values could reach approximately 43°C (109°F) in central, eastern and southeastern Arkansas and 42°C (107°F) elsewhere in the Mid-South. Farther west, temperatures near 38°C (100°F) are forecast in parts of North Texas as dangerous late-summer heat persists across the southern United States.
A heat wave across the San Francisco Bay Area and Central Coast brought temperatures well above normal on September 9, 2026, with daytime highs and overnight lows forecast 6–11°C (10–20°F) above normal and widespread Moderate to Major HeatRisk across the region. The National Weather Service (NWS) said the heat would persist through September 10, with inland highs reaching approximately 32–41°C (90–105°F), while the Bay Area Air District issued a Spare the Air Alert as ground-level ozone was forecast to reach unhealthy levels in parts of the Bay Area.
Extreme Heat Warnings and Heat Advisories were issued across parts of the central and southern United States, the Southwest and California on September 8, 2026. The National Weather Service (NWS) forecast heat index values up to 44°C (112°F) in parts of Arkansas and Oklahoma and temperatures up to 47°C (116°F) in Death Valley and the Colorado River Valley, with several western alerts continuing through September 11.
21 students were transported with heat-related illnesses after Carter Middle School in Knox County, Tennessee, evacuated students to a football field during an NWS Heat Advisory on September 4, 2026. The advisory warned of heat index values reaching 41.1°C (106°F) across the affected area, while three students were classified as critical when transported, according to Rural Metro Fire.
