Autumnal Equinox Will Arrive in North Dakota Tuesday

The astronomical start of fall will officially occur in Bismarck at 7:05pm on September 22.

Updated on Sept. 21, 2026 in Current Conditions

Expansive golden prairie landscape under a vast, clear autumn sky at sunset in North Dakota. — The autumnal equinox officially arrives in Bismarck, North Dakota, on Tuesday, marking the seasonal transition as the state navigates persistent long-term drought. AI Illustration. Upload story photo >

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The Autumnal Equinox will officially take place in Bismarck at 7:05pm on Tuesday, September 22, 2026. This celestial transition marks the end of a summer defined by persistent drought conditions across North Dakota.

Why it matters

Understanding the timing of the equinox helps residents track the shifting seasons as the state moves from a dry summer into the cooler months. Despite recent rainfall, the state continues to manage significant long-term drought challenges.

Southeastern North Dakota recorded an average of 1.5 inches of rain last week, while the southwest corner received less than 1 inch. These levels remain insufficient to eliminate existing drought conditions across the state.

The details

Summer 2026 was notably dry and remained cooler than the heat-intensive seasons recorded in 1936 and 1988. While recent precipitation helped keep topsoil wet and briefly lowered local fire danger, the overall moisture deficit persists.

The Autumnal Equinox will occur at 7:05pm on Tuesday, September 22, 2026.
Rainfall was recorded across the state between September 14 and September 20, 2026.
Historical comparisons for dry summers include the years 1936 and 1988.
Warmer than normal conditions are expected for the Winter 2026-2027 season.

Seasonal Patterns

The dry conditions of Summer 2026 are frequently measured against the extreme drought years of 1936 and 1988. This summer serves as a modern marker for the state's long-term moisture trends and historical temperature fluctuations.

Residents should remain aware of persistent fire danger despite recent rainfall that briefly moistened topsoil. Continued monitoring of local drought status is advised as the state transitions into a winter period expected to be warmer than average.

The takeaway

The arrival of the equinox signals a shift toward winter, with forecasts calling for a warmer-than-normal season due to El Nino patterns. Property owners should continue to practice caution regarding fire safety until deeper soil moisture levels improve.