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Weather Forecast (08/30/18)

The August 30 through September 5, 2018 Weather Summary and Outlook

Temperatures this month have been running mostly at or below average across much of the North Dakota Agricultural Weather Network (NDAWN). Many of you likely recall the brief heat wave from August 10-12 when temperatures exceeded 100° in western North Dakota. As an example, Williston recorded three straight triple digit high temperatures with the NDAWN station recording highs of 105° and 108° on two of those days. Yet, the month as a whole will finish below average at that location (Figure 1).  In fact, after a warm start much of North Dakota and northwestern Minnesota the summer of 2018 (June 1 though August 31) will finish very close to average as the second half of the summer has been nearly as cool as the first half of summer was warm.


August, like most of the summer, has been dry across much of northern North Dakota with the northeastern part of the state into northwestern Minnesota being the driest. Most of the rain that has fallen in that area this month occurred this past Sunday night with little or no moisture falling during the first three weeks of August (Figure 2).


There will be several time frames when at least some portion of the region will record rain during the next week. Friday, Sunday and Monday Night into Tuesday look to be the periods with the most widespread rain occurring. The locations that would need the rain the most once again look to be the areas that may record the least and the locations that currently have adequate or surplus moisture may end up with the most during this forecast period. In other words, the same pattern that has been with us through the summer is still in place. These next seven days should be much warmer than the past several days with temperatures mostly in the 70s and on a few occasions in the 80s for maximums. This should bring some additional late season growing degree days (GDDs) to the region. My projected GDDs for the period of August 30 through September 5 is presented in Figure 3.


Using May 5 as a planting date, the accumulated wheat growing degree days (Based 32°) through August 28, 2018 is presented in Figure 4. You can find your exact GDDs for your planting date(s) at:


Using May 10 as a planting date, the corn accumulated growing degree days (Base 50°) through August 28, 2018 is presented in Figure 5. You can find your exact GDDs for your planting date(s) at:



Daryl Ritchison


Interim Director of the North Dakota Agricultural Weather Network

This site is supported in part by the Crop Protection and Pest Management Program [grant no. 2017-70006-27144/accession 1013592] from the USDA National Institute of Food and Agriculture. Any opinions, findings, conclusions, or recommendations expressed are those of the website author(s) and do not necessarily reflect the view of the U.S. Department of Agriculture.

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