Weather in Brown County, South Dakota for May 2026
Red Flag Warning - See hour by hour.
Until now, May 2026 in Brown County is cooler than usual, with temperatures averaging 16.8 °F, this is -3.7 °F below the typical seasonal average.
Expect cooler weather in the next days in Brown County with the forecast suggesting a temperature of 18.4 °F, lower than the historical average.
In general, the average temperature in Brown County at the beginning of May is 17.9 °F. As the month progressed, temperatures tended to significantly warm up, reaching an average of 21.4 °F by the end of May.
Brown County experiences moderate rainfall in May, with an average of 8 rainy days and a total precipitation of 107.2 mm.
New! Chat with our AI weatherman - it’s amazing and free.
Official Weather Alert ⚠️
Temperatures
Rain 🌧️
More
Brown County Weather May
Temperatures trend during May in Brown County
May weather in Brown County day by day
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| May 1 |  Moderate rain at times | 15° /3° | 1.1 mm | 6 | |
| May 2 |  Overcast | 17° /3° | 0.1 mm | 6 | |
| May 3 |  Sunny | 21° /5° | 0 mm | 7 | |
| May 4 | Sunny | 19° /7° | 0 mm | 7 | |
| May 5 | Sunny | 18° /5° | 0 mm | 7 | |
| May 6 |  Partly cloudy | 17° /4° | 0 mm | 7 | |
| May 7 | Partly cloudy | 18° /3° | 0.6 mm | 8 | |
| May 8 | Sunny | 23° /6° | 0 mm | 8 | |
| May 9 |  Cloudy | 22° /9° | 0.9 mm | 8 | |
| May 10 | Partly cloudy | 22° /6° | 0 mm | 8 | |
| May 11 | Sunny | 27° /10° | 0 mm | 8 | |
| May 12 | Sunny | 27° /16° | 0 mm | 8 | |
| May 13 | Sunny | 29° /13° | 0 mm | 8 | |
| May 14 | Sunny | 28° /16° | 0.1 mm | 7.3 | |
| May 15 | Sunny | 26° /12° | 0 mm | 0.2 | |
| May 16 | Sunny | 23° /10° | 0 mm | 5 | |
| May 17 |  Moderate rain | 17° /12° | 12.6 mm | 3 | |
| May 18 | Moderate rain | 13° /8° | 14.2 mm | 3 | |
| May 19 |  Patchy rain possible | 14° /6° | 0.2 mm | 2 | |
| May 20 | Patchy rain possible | 20° /5° | 0.9 mm | 3 | |
| May 21 | Sunny | 17° /4° | 0 mm | 4 | |
| May 22 | Sunny | 25° /11° | 0 mm | 5 | |
| May 23 | Overcast | 16° /6° | 0 mm | 3 | |
| May 24 | Patchy rain possible | 7° /6° | 1.9 mm | 2 | |
| May 25 | Cloudy | 13° /7° | 0.1 mm | 2 | |
| May 26 | Partly cloudy | 16° /5° | 0 mm | 4 | |
| May 27 | Sunny | 22° /7° | 0 mm | 4 | |
| May 28 |  Fog | 20° /10° | 0 mm | 5 | |
| May 29 | Sunny | 25° /11° | 0 mm | 9 | |
| May 30 | Sunny | 26° /11° | 0 mm | 9 | |
| May 31 | Sunny | 28° /14° | 0 mm | 9 | |
| Next | |||||
Brown County in May - FAQ
What are the expected maximum and minimum temperatures in Brown County during May?
How much rainfall should be expected in Brown County during May?
What are the typical wind conditions in Brown County during May?
May rainfall patterns in Brown County
UV exposure in Brown County during May
Quick links
Where is Brown County?Get accurate weather forecasts for Brown County, located at latitude 45.465 and longitude -98.486. Stay updated with localized weather information tailored for Brown County.