Highlights: Scattered showers developed in the Southwest, which has experienced a sub-par monsoon season, and the Pacific Northwest, which endured an unusually warm, dry summer. Elsewhere west of the Rockies, warmth promoted crop development and fieldwork, including Northwestern small grain harvesting and planting activities. In southern California, however, the Station fire north of Los Angeles charred about 160,000 acres of vegetation and destroyed 166 structures, including more than six dozen residences.

Farther east, scattered showers and thunderstorms slowed fieldwork but maintained generally favorable soil moisture levels from the central and southern Plains into the Southeast. Rain was especially heavy in parts of Florida, where some locations received at least 4 inches. For the second consecutive week, some drought relief was noted in previously parched southern Texas. In contrast, mostly dry weather prevailed from the northern Plains into the Northeast, although showers spread into the Midwest as far north and east as the middle Missouri and Mississippi Valleys. Spring wheat harvesting advanced across the northern Plains, while growing conditions remained cool but otherwise nearly ideal for the Midwest's developmentally delayed corn and soybeans. Weekly temperatures averaged as much as 10 degrees Fahrenheit below normal from the east-central Plains into the central Corn Belt, while readings averaged at least 5 degrees Fahrenheit above normal across the northern High Plains and parts of the West.

Scattered frost and temperatures below 40 degrees Fahrenheit were reported in late August and early September as far south as northern Iowa. However, late-developing corn and soybeans were unharmed by the chilly conditions.

Early in the week, cool air settled across most areas east of the Rockies.

International Falls, Minnesota (32 degrees Fahrenheit), posted a daily-record low for August 30, while upper Midwestern daily records included 37 degrees Fahrenheit in Sisseton, South Dakota, and 38 degrees Fahrenheit in Grand Forks, North Dakota. In northern Iowa, Mason City noted lows of 38 and
39 degrees Fahrenheit on August 31 and September 1, respectively.

Daily-record lows for the last day of August included 31 degrees Fahrenheit in Merrill, Wisconsin; 34 degrees Fahrenheit in Gaylord, Michigan; and
42 degrees Fahrenheit in Lincoln, Nebraska. The following day, Eastern records for September 1 dipped to 34 degrees Fahrenheit in Bradford, Pennsylvania, and 44 degrees Fahrenheit in Martinsburg, West Virginia.

Later, daily-record warmth arrived in parts of the West, where Santa Cruz, California, attained 93 degrees Fahrenheit on September 2. The following day, Havre, Montana (99 degrees Fahrenheit on September 3), notched a daily-record high. In downtown Los Angeles, California, only a few miles from the massive Station fire, high temperatures reached or exceeded 90 degrees Fahrenheit on 10 consecutive days from August 26-September 4. It was the city's longest string of 90-degree days since August-September 1995, when Los Angeles experienced a 13-day heat wave. Farther east, Billings, Montana, experienced 5 consecutive days of 90-degree heat from September 2-6, breaking its monthly record of 4 days most recently attained from September 1-4, 2007.

Southeastern showers were particularly heavy across Florida, where daily-record totals were established in locations such as Melbourne (4.29 inches on September 1) and Jacksonville (4.13 inches on September 2).

Locally heavy showers were also scattered across the south-central U.S. and from the east-central Plains into the middle Mississippi Valley. Borger, Texas (1.71 inches), netted a daily-record sum for September 2, followed by a 3.07-inch total in Sioux City, Iowa, on September 3. Late in the week, a cold front triggered showers in the Pacific Northwest, while the remnants of Tropical Storm Erika produced heavy rain in parts of Puerto Rico and the U.S. Virgin Islands. Northwestern daily-record totals for September 5 included 0.75 inch in Portland, Oregon, and 0.21 inch in Yakima, Washington.

Meanwhile, September 4-5 airport rainfall totals in the U.S. Virgin Islands reached 2.13 inches on St. Thomas and 2.41 inches on St. Croix, while localized 4- to 8-inch amounts were observed in Puerto Rico.

Warmth returned to Alaska, following a chilly end of August. In fact, daily-record highs were established in locations such as Bettles (71 degrees Fahrenheit on September 4) and Juneau (72 degrees Fahrenheit on September 5).

However, much of Alaska continued to receive widespread precipitation.

Kotzebue, which experienced a cooler-than-normal month for the first time this year-with an August average of 49.8 degrees Fahrenheit (2.3 degrees Fahrenheit below normal)-received August rainfall totaling 3.18 inches (159 percent of normal). Pockets of dryness persisted, however, across mainland Alaska, where McGrath's July-August rainfall totaled just 2.02 inches (40 percent of normal). Farther south, generally tranquil weather continued across Hawaii, with showers mostly confined to windward locations. On the Big Island, Hilo netted 2.26 inches of rain (146 percent of normal) during the first 5 days of September.