Southern Idaho Weather Forecast

CHIEF METEOROLOGIST ERIC BRILL – EVENING UPDATE - Wednesday, September 27, 2023

The end of the work week continues to have fair weather within it, but unfortunately, the weekend still doesn’t look to nice, too.

Thursday is going to be about 10° cooler for afternoon highs compared to Wednesday, thanks to a cold front. Throughout all of Southern Idaho, afternoon high temperatures will be in the middle to lower 60s but mostly sunny skies will prevail. Any sort of outdoor plans you may have should be able to be executed from the weather side of things, and that will be the case for Friday, too. I anticipate temperatures climbing about 10° for the Magic Valley and Mini-Cassia Region for Friday, which bodes well for any outdoor plans you might have on Friday evening!

There is going to be an increase in cloud coverage overnight Friday into Saturday, as the next area of low pressure starts to move closer to our area. Not only is this going to drop temperatures down quite a bit to close out September and begin October, but it will also allow for some showers around Southern Idaho. If there is any good news, I do not anticipate that it will be quite as cool as previous forecast numbers had featured, so that rain/snow line should be a bit higher in elevation (not that I ever thought that would be an issue in valley areas). Temperatures are going to be in the upper 50s and lower 60s for the Magic Valley and Mini-Cassia Region for Saturday, Sunday and Monday, while the Wood River Valley will range throughout the middle 50s. Overnight low temperatures won’t bottom out a ton, thanks to cloud coverage being in place, although upper 30s and lower 40s are expected area-wide.

Rain totals for Saturday, Sunday and Monday aren’t expected to be too great. I think between 0.10″ to 0.25″ worth of rain will fall between the three days combined, but the higher elevation terrain could exceed 0.75″ of rain/precipitation. So long as these precipitation totals stay within this general range, there shouldn’t be any sort of flooding, but pockets of standing water could be around isolated parts of Southern Idaho.

As this area of low pressure starts to depart the area, it will bring the showers, clouds and cooler conditions with it. This is going to be a gradual process, but by Wednesday, pretty typical Fall weather for Idaho standards are expected. That results in many towns and cities climbing into the 60s and lower 70s for afternoon highs, upper 30s and lower 40s for overnight lows, not much of a breeze, plenty of sunshine (which also means a lack of rain) and overall, very nice weather!

The bookends of the seven day forecast look to be rather nice, but Saturday, Sunday and Monday won’t be great! None of those days are going to be a washout, but anticipate cooler temperatures and additional cloud coverage to be over the skies of Southern Idaho.

For the latest on all warnings and advisories in Southern Idaho click on to Alerts (kmvt.com)

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WEDNESDAY NIGHT (September 27, 2023)

MAGIC VALLEY: Partly cloudy skies. Low: 43. Winds: Southwest to West 5-10 mph. WOOD RIVER VALLEY: Partly to mostly cloudy skies. Low: 34. Winds: North 5-10 mph.

THURSDAY (September 28th)

MAGIC VALLEY: Mostly sunny skies. High: 65. Winds: West to Northwest 5-15 mph. WOOD RIVER VALLEY: Partly cloudy skies. High: 61. Winds: Southwest 5-15 mph.

THURSDAY NIGHT:

MAGIC VALLEY: Mostly clear skies. Low: 39. Winds: Southwest to West 5-10 mph. WOOD RIVER VALLEY: Partly cloudy skies. Low: 34. Winds: Northwest to North 5-10 mph.

FRIDAY (September 29th)

MAGIC VALLEY: Mostly sunny skies. High: 74. Low: 44. WOOD RIVER VALLEY: Partly cloudy skies. High: 61. Low: 41.

SATURDAY (September 30th)

MAGIC VALLEY: Mostly cloudy skies with a chance of showers and/or thunderstorms. High: 62. Low: 40. WOOD RIVER VALLEY: Mostly cloudy skies with a chance of showers and/or thunderstorms. High: 57. Low: 40.

SUNDAY (October 1st)

MAGIC VALLEY: Partly sunny skies with scattered showers and/or thunderstorms. High: 58. Low: 39. WOOD RIVER VALLEY: Partly sunny skies with scattered showers and/or thunderstorms. High: 52. Low: 37.

MONDAY (October 2nd)

MAGIC VALLEY: Partly cloudy skies with some scattered showers and/or thunderstorms. High: 61. Low: 39. WOOD RIVER VALLEY: Partly cloudy skies with some scattered showers and/or thunderstorms around. High: 53. Low: 35.

TUESDAY (October 3rd)

MAGIC VALLEY: Partly cloudy skies with a slight chance of a shower or thunderstorm. It could be a bit breezy, too. High: 65. Low: 43. WOOD RIVER VALLEY: Partly cloudy skies with a slight chance of a shower or thunderstorm. High: 57. Low: 36.

WEDNESDAY (October 4th)

MAGIC VALLEY: Mainly sunny skies. High: 70. WOOD RIVER VALLEY: Mainly sunny skies. High: 62.

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