Grenville, SD Weather Forecast for 5-Days

Updated: Fri May 15th 2026 9:15 AM CDT

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Grenville, SD Weather – 5-15 – Sunny
80° / 48°
Sunny
Highs will reach 80°F with lows near 48°F in Grenville, where sunshine is. Wind will be moderate, blowing around 19mph on average and gusts of 21.9mph at 4 PM. Humidity levels should be comfortable, sitting around 49% on average, the maximum being 49% at 10 AM and 18% being its lowest at 3 PM. Barometric pressure is its highest of 29.67inHg at 11 PM, a lowest point of 29.61inHg at 3 PM with an avg 29.64inHg.
Grenville, SD Weather – 5-16 – Sunny
73° / 53°

Weather Tomorrow

Sunny
Highs will reach 73°F with lows near 53°F in Grenville, where a sunny day is. Wind will be moderate, blowing around 13mph on average and gusts of 26.3mph at 11 PM. Humidity levels should be comfortable, sitting around 40% on average, the maximum being 57% at 7 AM and 27% being its lowest at 3 PM. Barometric pressure is its highest of 29.83inHg at 11 AM, a lowest point of 29.69inHg at 12 AM with an avg 29.78inHg.
Grenville, SD Weather – 5-17 – Heavy Rain
72° / 51°
Heavy Rain
Periods of rain are likely in Grenville, with a high of 72°F and a low of 51°F. The chance of rain is 85% with an estimated 1.31in. Wind will be moderate, blowing around 20mph on average and gusts of 32.5mph at 3 AM. The humidity will be on the higher side, averaging about 78%, the maximum being 98% at 6 PM and 57% being its lowest at 12 AM. Barometric pressure is its highest of 29.82inHg at 1 AM, a lowest point of 29.41inHg at 4 PM with an avg 29.62inHg.
Grenville, SD Weather – 5-18 – Moderate Rain
52° / 42°
Moderate Rain
In Grenville, it will rain at times with highs near 52°F and lows around 42°F. Rainfall predicted to have a 67% chance with an estimated 0.22in. Wind will be moderate, blowing around 19mph on average and gusts of 23.9mph at 5 AM. The humidity will be on the higher side, averaging about 78%, the maximum being 95% at 9 PM and 56% being its lowest at 2 PM. Barometric pressure is its highest of 29.95inHg at 10 PM, a lowest point of 29.65inHg at 12 AM with an avg 29.81inHg.
Grenville, SD Weather – 5-19 – Scattered Showers
63° / 36°
Scattered Showers
Daytime highs will reach 63°F with lows dropping to 36°F in Grenville, where on and off showers are set to occur. The chance of rain is 80% with an estimated 0.02in. Wind will be moderate, blowing around 18mph on average and gusts of 22.5mph at 7 AM. The humidity will be on the higher side, averaging about 75%, the maximum being 96% at 5 AM and 36% being its lowest at 4 PM. Barometric pressure is its highest of 30.11inHg at 10 AM, a lowest point of 29.86inHg at 12 AM with an avg 30inHg.
Grenville, SD Weather – 5-20 – Scattered Showers
52° / 48°
Scattered Showers
Highs will reach 52°F with lows near 48°F in Grenville, where passing showers are. The chance of rain is 77% with an estimated 0.18in. Wind will be moderate, blowing around 16mph on average and gusts of 22.2mph at 10 AM. The humidity will be on the higher side, averaging about 80%, the maximum being 95% at 11 PM and 53% being its lowest at 12 AM. Barometric pressure is its highest of 30.11inHg at 10 PM, a lowest point of 30.01inHg at 5 AM with an avg 30.04inHg.

Currently

Sunny 57°F
29.71 inHg.
Barometer
59%
Humidity
W 24.5 mph
Wind
Sunny

5 Day Forecast Nearby

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