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Lacy SD Weather - Light Rain - 69°F
Light Rain
69°F
Updated 6:45 am
Feels Like 69°F
Humidity 96%
Wind SSE 13 mph
Barometer  29.84 in
Dew Point 68°F
Lacy SD Weather - Light Rain - 21°C
Light Rain
21°C
Updated 6:45 am
Feels Like 21°C
Humidity 96%
Wind SSE 21 km/h
Barometer  101 kPa
Dew Point 20°C
Lacy, SD Weather and Current Conditionslacy sd weather forecast

Lacy, SD Weather Forecast

Lacy South Dakota WeatherLacy, South Dakota Weather Weather Forecast
14 day API weather forecast for Lacy, South Dakota. Note: The 7-day weather forecast for Lacy, SD is the most reliable and accurate weather forecast. This model should only be used as a likely scenario. It is difficult to predict weather more than 7 days ahead.
Lacy, SD Weather Forecast Dated: 645 AM Mon Sep 07 2026
Expect a very warm period with a mix of sun and clouds and mostly dry weather over the coming period. comfortable humidity and no major pressure swings will dominate.

Monday, September 7, 2026

Mid-Morning
Lacy Weather - 2026-09-07 - Morning - Drizzle
73°F 23°C
Drizzle
Mid-Afternoon
Lacy Weather - 2026-09-07 - Afternoon - Overcast
92°F 33°C
Overcast
Early-Evening
Lacy Weather - 2026-09-07 - Evening - Overcast
92°F 33°C
Overcast
Very hot with temperatures reaching 92°F 33°C, early showers breaking for a drier afternoon, with lower humidity and steady pressure. Winds turning from the SSE to the SW at 14 mph 23 km/h. Gusts up to 28 mph 45 km/h.

Tuesday, September 8, 2026

Mid-Morning
Lacy Weather - 2026-09-08 - Morning - Sunny
71°F 22°C
Sunny
Mid-Afternoon
Lacy Weather - 2026-09-08 - Afternoon - Sunny
83°F 28°C
Sunny
Early-Evening
Lacy Weather - 2026-09-08 - Evening - Sunny
79°F 27°C
Sunny
Balmy with temperatures reaching 83°F 28°C, sunny throughout the day, with steady humidity and steady pressure. Winds tapering down from NW 19 mph 31 km/h to N 9 mph 14 km/h.

Wednesday, September 9, 2026

Mid-Morning
Lacy Weather - 2026-09-09 - Morning - Sunny
64°F 18°C
Sunny
Mid-Afternoon
Lacy Weather - 2026-09-09 - Afternoon - Sunny
79°F 26°C
Sunny
Early-Evening
Lacy Weather - 2026-09-09 - Evening - Sunny
77°F 25°C
Sunny
Enjoyable around 79°F 26°C, sunny throughout the day, with lower humidity and barometric pressure falling. Winds decreasing from NW 14 mph 23 km/h to NE 6 mph 9 km/h.

Thursday, September 10, 2026

Mid-Morning
Lacy Weather - 2026-09-10 - Morning - Sunny
72°F 22°C
Sunny
Mid-Afternoon
Lacy Weather - 2026-09-10 - Afternoon - Sunny
89°F 31°C
Sunny
Early-Evening
Lacy Weather - 2026-09-10 - Evening - Sunny
87°F 30°C
Sunny
Warm temperatures up to 89°F 31°C, sunny throughout the day, with lower humidity and barometric pressure falling. Winds swinging from the SW to the SSE at 8 mph 13 km/h.

Friday, September 11, 2026

Mid-Morning
Lacy Weather - 2026-09-11 - Morning - Cloudy
68°F 20°C
Cloudy
Mid-Afternoon
Lacy Weather - 2026-09-11 - Afternoon - Sunny
79°F 26°C
Sunny
Early-Evening
Lacy Weather - 2026-09-11 - Evening - Sunny
74°F 23°C
Sunny
Mild with a high of 79°F 26°C, cloudy in the morning, partly cloudy in the afternoon, and sunny this evening, with steady humidity and steady pressure. Winds tapering down from N 20 mph 32 km/h to NNE 11 mph 17 km/h.

Saturday, September 12, 2026

Mid-Morning
Lacy Weather - 2026-09-12 - Morning - Scattered Showers
55°F 13°C
Scattered Showers
Mid-Afternoon
Lacy Weather - 2026-09-12 - Afternoon - Overcast
49°F 10°C
Overcast
Early-Evening
Lacy Weather - 2026-09-12 - Evening - Overcast
47°F 8°C
Overcast
Cool and brisk at 49°F 10°C, locally heavy downpours at times, with increasing humidity and barometric pressure rising. Winds turning from the NNE to the NNW at 13 mph 20 km/h.

Sunday, September 13, 2026

Mid-Morning
Lacy Weather - 2026-09-13 - Morning - Sunny
51°F 10°C
Sunny
Mid-Afternoon
Lacy Weather - 2026-09-13 - Afternoon - Sunny
61°F 16°C
Sunny
Early-Evening
Lacy Weather - 2026-09-13 - Evening - Sunny
60°F 15°C
Sunny
Comfortable at 61°F 16°C, sunny throughout the day, with lower humidity and steady pressure. Winds switching from the NNW to the ENE at 8 mph 12 km/h.

Monday, September 14, 2026

Mid-Morning
Lacy Weather - 2026-09-14 - Morning - Sunny
58°F 14°C
Sunny
Mid-Afternoon
Lacy Weather - 2026-09-14 - Afternoon - Sunny
72°F 22°C
Sunny
Early-Evening
Lacy Weather - 2026-09-14 - Evening - Sunny
70°F 21°C
Sunny
Enjoyable around 72°F 22°C, sunny throughout the day, with steady humidity and barometric pressure falling. Winds building from SSE at 6 mph 10 km/h to ESE at 15 mph 23 km/h. Gusts up to 26 mph 41 km/h.

Tuesday, September 15, 2026

Mid-Morning
Lacy Weather - 2026-09-15 - Morning - Sunny
64°F 18°C
Sunny
Mid-Afternoon
Lacy Weather - 2026-09-15 - Afternoon - Overcast
86°F 30°C
Overcast
Early-Evening
Lacy Weather - 2026-09-15 - Evening - Sunny
84°F 29°C
Sunny
Warm temperatures up to 86°F 30°C, sunny in the morning, overcast in the afternoon, and sunny this evening, with lower humidity and barometric pressure falling. Winds decreasing from SSE 20 mph 32 km/h to SE 11 mph 18 km/h. Gusts up to 23 mph 37 km/h.

Wednesday, September 16, 2026

Mid-Morning
Lacy Weather - 2026-09-16 - Morning - Sunny
71°F 22°C
Sunny
Mid-Afternoon
Lacy Weather - 2026-09-16 - Afternoon - Cloudy
97°F 36°C
Cloudy
Early-Evening
Lacy Weather - 2026-09-16 - Evening - Overcast
93°F 34°C
Overcast
Very hot with a high of 97°F 36°C, sunny in the morning, becoming overcast through the afternoon and evening, with lower humidity and barometric pressure falling. Winds shifting from the SE to the ESE at 12 mph 19 km/h. Gusts up to 23 mph 37 km/h.

Thursday, September 17, 2026

Mid-Morning
Lacy Weather - 2026-09-17 - Morning - Overcast
72°F 22°C
Overcast
Mid-Afternoon
Lacy Weather - 2026-09-17 - Afternoon - Sunny
92°F 34°C
Sunny
Early-Evening
Lacy Weather - 2026-09-17 - Evening - Overcast
84°F 29°C
Overcast
Very hot with temperatures reaching 92°F 34°C, overcast in the morning, sunny in the afternoon, and overcast this evening, with steady humidity and barometric pressure falling. Winds turning from the W to the NNW at 9 mph 14 km/h.

Friday, September 18, 2026

Mid-Morning
Lacy Weather - 2026-09-18 - Morning - Cloudy
67°F 19°C
Cloudy
Mid-Afternoon
Lacy Weather - 2026-09-18 - Afternoon - Overcast
81°F 27°C
Overcast
Early-Evening
Lacy Weather - 2026-09-18 - Evening - Scattered Showers
75°F 24°C
Scattered Showers
Balmy with temperatures reaching 81°F 27°C, locally heavy downpours at times, with lower humidity and steady pressure. Winds NNW at 11 mph 17 km/h. Gusts up to 24 mph 38 km/h.

Saturday, September 19, 2026

Mid-Morning
Lacy Weather - 2026-09-19 - Morning - Cloudy
56°F 13°C
Cloudy
Mid-Afternoon
Lacy Weather - 2026-09-19 - Afternoon - Overcast
58°F 14°C
Overcast
Early-Evening
Lacy Weather - 2026-09-19 - Evening - Overcast
56°F 14°C
Overcast
Refreshing around 58°F 14°C, cloudy in the morning, overcast in the afternoon, and partly cloudy this evening, with steady humidity and barometric pressure rising. Winds easing from NNE 16 mph 26 km/h to N 6 mph 10 km/h.

Sunday, September 20, 2026

Mid-Morning
Lacy Weather - 2026-09-20 - Morning - Overcast
49°F 10°C
Overcast
Mid-Afternoon
Lacy Weather - 2026-09-20 - Afternoon - Sunny
73°F 23°C
Sunny
Early-Evening
Lacy Weather - 2026-09-20 - Evening - Sunny
73°F 23°C
Sunny
Mild temperatures up to 73°F 23°C, overcast in the morning, becoming sunny through the afternoon and evening, with lower humidity and barometric pressure falling. Winds swinging from the SE to the SSE at 18 mph 29 km/h. Gusts up to 32 mph 52 km/h.

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Weather by the Numbers

Mon, 7th
Lacy SD Weather - Monday, Sep 7, 2026 - Overcast
Hi: 95°F 35°C
Lo: 71°F 22°C
Sunrise 06:12 AM
Sunset 07:07 PM
Wind SSW 14 mph22 km/h
Dew Point 57°F14°C
uv Index 6
Barometric Pressure 29.62 in1003 mb
POP 10% *
Humidity 35%
Tue, 8th
Lacy SD Weather - Tuesday, Sep 8, 2026 - Sunny
Hi: 83°F 28°C
Lo: 69°F 20°C
Sunrise 06:13 AM
Sunset 07:06 PM
Wind NW 17 mph28 km/h
Dew Point 38°F3°C
uv Index 6
Barometric Pressure 29.91 in1013 mb
POP 0% *
Humidity 24%
Wed, 9th
Lacy SD Weather - Wednesday, Sep 9, 2026 - Sunny
Hi: 79°F 26°C
Lo: 59°F 15°C
Sunrise 06:14 AM
Sunset 07:04 PM
Wind NW 13 mph20 km/h
Dew Point 38°F3°C
uv Index 6
Barometric Pressure 30.06 in1018 mb
POP 0% *
Humidity 27%
Thu, 10th
Lacy SD Weather - Thursday, Sep 10, 2026 - Partly Cloudy
Hi: 90°F 32°C
Lo: 68°F 20°C
Sunrise 06:15 AM
Sunset 07:02 PM
Wind SW 8 mph13 km/h
Dew Point 32°F0°C
uv Index 6
Barometric Pressure 29.8 in1009 mb
POP 3% *
Humidity 16%
Fri, 11th
Lacy SD Weather - Friday, Sep 11, 2026 - Sunny
Hi: 79°F 26°C
Lo: 63°F 17°C
Sunrise 06:16 AM
Sunset 07:00 PM
Wind N 20 mph32 km/h
Dew Point 44°F7°C
uv Index 6
Barometric Pressure 29.65 in1004 mb
POP 1% *
Humidity 32%
Sat, 12th
Lacy SD Weather - Saturday, Sep 12, 2026 - Patchy Rain Nearby
Hi: 62°F 17°C
Lo: 47°F 8°C
Sunrise 06:18 AM
Sunset 06:58 PM
Wind NNE 17 mph28 km/h
Dew Point 39°F4°C
uv Index 3
Barometric Pressure 29.88 in1012 mb
POP 13% *
Humidity 49%
Sun, 13th
Lacy SD Weather - Sunday, Sep 13, 2026 - Sunny
Hi: 61°F 16°C
Lo: 48°F 9°C
Sunrise 06:19 AM
Sunset 06:56 PM
Wind N 15 mph23 km/h
Dew Point 31°F-1°C
uv Index 4
Barometric Pressure 30.09 in1019 mb
POP 1% *
Humidity 37%
Mon, 14th
Lacy SD Weather - Monday, Sep 14, 2026 - Sunny
Hi: 72°F 22°C
Lo: 54°F 12°C
Sunrise 06:20 AM
Sunset 06:54 PM
Wind SE 9 mph15 km/h
Dew Point 29°F-1°C
uv Index 5
Barometric Pressure 30.18 in1022 mb
POP 0% *
Humidity 24%
Tue, 15th
Lacy SD Weather - Tuesday, Sep 15, 2026 - Partly Cloudy
Hi: 88°F 31°C
Lo: 57°F 14°C
Sunrise 06:21 AM
Sunset 06:52 PM
Wind SSE 18 mph28 km/h
Dew Point 39°F4°C
uv Index 7
Barometric Pressure 29.91 in1013 mb
POP 3% *
Humidity 24%
Wed, 16th
Lacy SD Weather - Wednesday, Sep 16, 2026 - Partly Cloudy
Hi: 98°F 37°C
Lo: 68°F 20°C
Sunrise 06:22 AM
Sunset 06:51 PM
Wind SE 12 mph20 km/h
Dew Point 40°F4°C
uv Index 8
Barometric Pressure 29.83 in1010 mb
POP 4% *
Humidity 19%
Thu, 17th
Lacy SD Weather - Thursday, Sep 17, 2026 - Partly Cloudy
Hi: 92°F 34°C
Lo: 72°F 22°C
Sunrise 06:23 AM
Sunset 06:49 PM
Wind SW 8 mph13 km/h
Dew Point 45°F7°C
uv Index 7
Barometric Pressure 29.85 in1011 mb
POP 2% *
Humidity 27%
Fri, 18th
Lacy SD Weather - Friday, Sep 18, 2026 - Overcast
Hi: 81°F 27°C
Lo: 66°F 19°C
Sunrise 06:25 AM
Sunset 06:47 PM
Wind NE 6 mph10 km/h
Dew Point 50°F10°C
uv Index 6
Barometric Pressure 29.74 in1007 mb
POP 10% *
Humidity 35%
Sat, 19th
Lacy SD Weather - Saturday, Sep 19, 2026 - Overcast
Hi: 64°F 18°C
Lo: 53°F 12°C
Sunrise 06:26 AM
Sunset 06:45 PM
Wind N 17 mph27 km/h
Dew Point 28°F-2°C
uv Index 3
Barometric Pressure 30.24 in1024 mb
POP 10% *
Humidity 33%
Sun, 20th
Lacy SD Weather - Sunday, Sep 20, 2026 - Sunny
Hi: 75°F 24°C
Lo: 46°F 8°C
Sunrise 06:27 AM
Sunset 06:43 PM
Wind SSE 20 mph32 km/h
Dew Point 28°F-2°C
uv Index 5
Barometric Pressure 30.21 in1023 mb
POP 1% *
Humidity 26%
* POP = Probability of Precipitation. Data for 12:00 PM.