September 2024 Weather Predictions. Fall officially begins on sunday, september 22, 2024, at 8:44 a.m. September 2024 — very sunny, dry and warm, with high pressure often centred over the country, bringing fine, warm days, but cool nights at times.
Our long range forecast (which is updated on a daily basis) provides an indication of how the weather might change, or be different from normal, (i.e. Eastern washington has equal chances of below,.