Observed 8:55 PM CDT at KDSM

St. Marys, IA weather

Clear and 66°19°.

Forecasts agree

Now 66°19°

Clear

Wind: 7 mph11 km/h; From the east-southeast. 35–7 mph11 km/h through 9 AM
Dew point: 48°9°; Comfortable
UV tomorrow: 4Moderate; Moderate 12–4 PM · peak 4
Air quality: 62Moderate; Main pollutant: PM2.5 (fine particles)
Pressure: 30.28 inHg1025 hPa; Rising slowly · +0.04 inHg+1.4 hPa in 3 h

No precipitation expected in the next 2 hours.

From forecast models

Next 48 hours

Good hours for

Low 56°13° tomorrow at 7 AM
Above 70°21° tomorrow by noon
High 77°25° tomorrow at 3 PM
Below 70°21° tomorrow night after 8 PM

TonightDown to 58°14° by 5 AM · Mostly cloudy
Tomorrow morningUp to 68°20° by 11 AM · Mostly cloudy
Tomorrow afternoonUp to 77°25° by 3 PM · Mostly cloudy
Tomorrow nightDown to 56°13° by 5 AM · Mostly cloudy
Monday morningUp to 64°18° by 11 AM · Cloudy
Monday afternoonUp to 74°23° by 3 PM · Mostly cloudy
Monday nightDown to 66°19° by 8 PM · rain chance 10% · Mostly cloudy

Hourly forecast, next 48 hours, in the place's local time
Hour	Conditions	Temperature	Feels like	Precipitation	Wind	Humidity	Cloud cover	UV index
Sat 9p	Clear	64°18° (likely 64°18° to 66°19°)	64°18°	0%	6 mph10 km/h from S, gusts 14 mph23 km/h	67%	38%	0
Sat 10p	Cloudy	63°17° (likely 63°17° to 65°18°)	63°17°	0%	6 mph10 km/h from S, gusts 13 mph21 km/h	70%	76%	0
Sat 11p	Cloudy	62°17° (likely 62°17° to 64°18°)	62°17°	0%	6 mph10 km/h from S, gusts 11 mph18 km/h	70%	79%	0
Sun 12a	Cloudy	61°16° (likely 61°16° to 63°17°)	61°16°	0%	6 mph10 km/h from S, gusts 8 mph12 km/h	70%	80%	0
Sun 1a	Cloudy	60°16° (likely 60°16° to 62°17°)	60°16°	0%	6 mph10 km/h from SSW, gusts 7 mph12 km/h	72%	79%	0
Sun 2a	Cloudy	60°16° (likely 59°15° to 60°16°)	60°16°	0%	5 mph8 km/h from WSW, gusts 5 mph9 km/h	69%	78%	0
Sun 3a	Cloudy	59°15° (likely 57°14° to 59°15°)	59°15°	0%	5 mph8 km/h from W, gusts 5 mph7 km/h	72%	75%	0
Sun 4a	Cloudy	59°15° (likely 55°13° to 59°15°)	59°15°	0%	5 mph8 km/h from WSW, gusts 4 mph6 km/h	72%	72%	0
Sun 5a	Mostly cloudy	58°14° (likely 54°12° to 58°14°)	58°14°	0%	3 mph5 km/h from W, gusts 3 mph5 km/h	75%	64%	0
Sun 6a	Mostly cloudy	57°14° (likely 52°11° to 57°14°)	57°14°	0%	3 mph5 km/h from WSW, gusts 4 mph6 km/h	75%	60%	0
Sun 7a	Mostly cloudy	56°13° (likely 51°11° to 56°13°)	56°13°	0%	3 mph5 km/h from SW, gusts 6 mph10 km/h	77%	58%	0
Sun 8a	Partly sunny	56°13° (likely 50°10° to 56°13°)	56°13°	0%	3 mph5 km/h from SW, gusts 7 mph11 km/h	80%	63%	0
Sun 9a	Cloudy	58°14° (likely 53°12° to 58°14°)	58°14°	0%	3 mph5 km/h from SSE, gusts 6 mph9 km/h	77%	71%	0
Sun 10a	Mostly cloudy	63°17° (likely 59°15° to 63°17°)	63°17°	0%	2 mph3 km/h from S, gusts 7 mph11 km/h	67%	67%	1
Sun 11a	Partly sunny	68°20° (likely 62°17° to 68°20°)	68°20°	0%	3 mph5 km/h from S, gusts 9 mph15 km/h	57%	74%	2
Sun 12p	Partly sunny	71°22° (likely 66°19° to 71°22°)	71°22°	0%	3 mph5 km/h from S, gusts 5 mph9 km/h	53%	74%	4
Sun 1p	Cloudy	74°23° (likely 69°21° to 74°23°)	74°23°	0%	3 mph5 km/h from S, gusts 6 mph9 km/h	48%	78%	4
Sun 2p	Cloudy	75°24° (likely 71°22° to 75°24°)	75°24°	0%	3 mph5 km/h from S, gusts 5 mph8 km/h	46%	78%	4
Sun 3p	Cloudy	77°25° (likely 73°23° to 77°25°)	77°25°	0%	3 mph5 km/h from S, gusts 4 mph7 km/h	43%	80%	3
Sun 4p	Cloudy	77°25° (likely 73°23° to 77°25°)	77°25°	0%	3 mph5 km/h from S, gusts 6 mph9 km/h	42%	81%	2
Sun 5p	Cloudy	76°24° (likely 73°23° to 76°24°)	76°24°	0%	3 mph5 km/h from SSE, gusts 7 mph11 km/h	45%	81%	1
Sun 6p	Cloudy	74°23° (likely 69°21° to 74°23°)	74°23°	0%	5 mph8 km/h from ESE, gusts 7 mph11 km/h	48%	81%	0
Sun 7p	Cloudy	70°21° (likely 65°18° to 70°21°)	70°21°	0%	5 mph8 km/h from SE, gusts 10 mph16 km/h	55%	81%	0
Sun 8p	Cloudy	65°18° (likely 63°17° to 65°18°)	65°18°	0%	5 mph8 km/h from ENE, gusts 10 mph16 km/h	65%	80%	0
Sun 9p	Cloudy	64°18° (likely 62°17° to 64°18°)	64°18°	0%	3 mph5 km/h from SSE, gusts 9 mph14 km/h	67%	80%	0
Sun 10p	Cloudy	62°17° (likely 60°16° to 62°17°)	62°17°	0%	3 mph5 km/h from S, gusts 9 mph14 km/h	72%	78%	0
Sun 11p	Cloudy	61°16° (likely 58°14° to 61°16°)	61°16°	0%	3 mph5 km/h from S, gusts 8 mph13 km/h	72%	76%	0
Mon 12a	Cloudy	60°16° (likely 57°14° to 60°16°)	60°16°	0%	3 mph5 km/h from S, gusts 10 mph16 km/h	75%	83%	0
Mon 1a	Cloudy	59°15° (likely 56°13° to 59°15°)	59°15°	0%	3 mph5 km/h from S, gusts 12 mph19 km/h	78%	82%	0
Mon 2a	Cloudy	58°14° (likely 55°13° to 58°14°)	58°14°	0%	3 mph5 km/h from SSE, gusts 13 mph20 km/h	80%	81%	0
Mon 3a	Cloudy	58°14° (likely 54°12° to 58°14°)	58°14°	0%	3 mph5 km/h from SE, gusts 13 mph20 km/h	77%	87%	0
Mon 4a	Cloudy	57°14° (likely 52°11° to 57°14°)	57°14°	0%	3 mph5 km/h from ESE, gusts 13 mph21 km/h	80%	88%	0
Mon 5a	Cloudy	56°13° (likely 52°11° to 56°13°)	56°13°	0%	3 mph5 km/h from E, gusts 11 mph18 km/h	80%	90%	0
Mon 6a	Cloudy	55°13° (likely 51°11° to 55°13°)	55°13°	0%	3 mph5 km/h from E, gusts 11 mph18 km/h	83%	93%	0
Mon 7a	Cloudy	55°13° (likely 50°10° to 55°13°)	55°13°	0%	3 mph5 km/h from E, gusts 10 mph17 km/h	83%	83%	0
Mon 8a	Cloudy	54°12° (likely 50°10° to 54°12°)	54°12°	0%	3 mph5 km/h from E, gusts 10 mph17 km/h	83%	87%	0
Mon 9a	Cloudy	56°13° (likely 52°11° to 56°13°)	56°13°	0%	3 mph5 km/h from E, gusts 12 mph19 km/h	80%	86%	0
Mon 10a	Cloudy	60°16° (likely 54°12° to 60°16°)	60°16°	0%	5 mph8 km/h from ESE, gusts 13 mph21 km/h	72%	87%	1
Mon 11a	Cloudy	64°18° (likely 58°14° to 64°18°)	64°18°	0%	5 mph8 km/h from SE, gusts 13 mph20 km/h	63%	77%	2
Mon 12p	Cloudy	68°20° (likely 62°17° to 68°20°)	68°20°	0%	6 mph10 km/h from SE, gusts 10 mph16 km/h	55%	76%	3
Mon 1p	Cloudy	71°22° (likely 63°17° to 71°22°)	71°22°	0%	6 mph10 km/h from SE, gusts 9 mph14 km/h	49%	87%	3
Mon 2p	Cloudy	73°23° (likely 65°18° to 73°23°)	73°23°	0%	7 mph11 km/h from SE, gusts 10 mph16 km/h	46%	92%	4
Mon 3p	Cloudy	74°23° (likely 67°19° to 74°23°)	74°23°	0%	8 mph13 km/h from SSE, gusts 11 mph18 km/h	43%	86%	3
Mon 4p	Cloudy	74°23° (likely 69°21° to 74°23°)	74°23°	0%	8 mph13 km/h from SSE, gusts 11 mph18 km/h	43%	85%	2
Mon 5p	Cloudy	73°23° (likely 69°21° to 73°23°)	73°23°	0%	8 mph13 km/h from SSE, gusts 12 mph20 km/h	44%	75%	1
Mon 6p	Mostly cloudy	71°22° (likely 66°19° to 71°22°)	71°22°	0%	7 mph11 km/h from SE, gusts 12 mph19 km/h	47%	69%	0
Mon 7p	Cloudy	68°20° (likely 63°17° to 68°20°)	68°20°	10%	7 mph11 km/h from SE, gusts 10 mph17 km/h	53%	75%	0
Mon 8p	Mostly cloudy	66°19° (likely 62°17° to 66°19°)	66°19°	10%	7 mph11 km/h from SSE, gusts 10 mph16 km/h	56%	76%	0

Days ahead

Tap a day for its hours and the official wording.

Today, Oct 24. Cloudy. High 79°26°, low 56°13°. Dry. Forecasts agree.
1. Evening
  6 PM–midnight
  Cloudy, 62°17°
  Dry
2. Overnight
  midnight–6 AM
  Cloudy, 58°14°
  Dry
Official NWS forecast
Tonight: Mostly cloudy. Low around 56, with temperatures rising to around 58 overnight. Southwest wind around 6 mph.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
78°26°–79°26°
Low, likely
56°13°–58°14°
Wind
14 mph22 km/h, gusts 24 mph39 km/h
UV peak
4
Tomorrow, Oct 25. Cloudy. High 77°25°, low 54°12°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Cloudy, 56°13°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 77°25°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 65°18°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 56°13°
  Dry
Official NWS forecast
Day: Partly sunny, with a high near 77. South wind around 3 mph.
Night: Mostly cloudy. Low around 54, with temperatures rising to around 56 overnight. Southeast wind around 5 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
73°23°–77°25°
Low, likely
50°10°–55°13°
Wind
9 mph14 km/h, gusts 15 mph23 km/h
UV peak
4
Monday, Oct 26. Mostly cloudy. High 74°23°, low 57°14°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Cloudy, 54°12°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 74°23°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 66°19°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 61°16°
  Dry
Official NWS forecast
Day: Partly sunny, with a high near 74. East southeast wind 3 to 8 mph.
Night: Mostly cloudy, with a low around 57. South southeast wind around 8 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
70°21°–74°23°
Low, likely
49°9°–57°14°
Wind
10 mph17 km/h, gusts 20 mph31 km/h
UV peak
4
Tuesday, Oct 27. Mostly cloudy. High 72°22°, low 58°14°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Cloudy, 60°16°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 68°20°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 63°17°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 59°15°
  20% chance · 0.02 in0.5 mm
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly cloudy, with a high near 72.
Night: A slight chance of rain showers after 7pm. Mostly cloudy, with a low around 58. Chance of precipitation is 20%.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
66°19°–72°22°
Low, likely
58°14°–60°16°
Wind
15 mph23 km/h, gusts 27 mph43 km/h
UV peak
2
Wednesday, Oct 28. Showers. High 75°24°, low 57°14°. Rain 0.04 in1 mm, 20% chance. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 59°15°
  20% chance
2. Afternoon
  noon–6 PM
  Partly sunny, 75°24°
  Dry
3. Evening
  6 PM–midnight
  Drizzle, 68°20°
  20% chance · 0.03 in0.6 mm
4. Overnight
  midnight–6 AM
  Drizzle, 61°16°
  30% chance · 0.07 in1.7 mm
Hours this far out come from computer models only.
Official NWS forecast
Day: A slight chance of rain showers before 7am, then a slight chance of showers and thunderstorms between 7am and 1pm. Mostly sunny, with a high near 75. Chance of precipitation is 20%.
Night: A chance of rain showers after 7pm. Partly cloudy, with a low around 57. Chance of precipitation is 40%.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
73°23°–76°24°
Low, likely
56°13°–61°16°
Wind
17 mph27 km/h, gusts 36 mph58 km/h
UV peak
4
Thursday, Oct 29. Showers. High 75°24°, low 60°16°. Rain 0.19 in4.8 mm, 40% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Showers, 61°16°
  30% chance · 0.08 in1.9 mm
2. Afternoon
  noon–6 PM
  Cloudy, 71°22°
  Dry
3. Evening
  6 PM–midnight
  Drizzle, 67°19°
  Dry
4. Overnight
  midnight–6 AM
  Showers, 63°17°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: A chance of rain showers. Mostly sunny, with a high near 75. Chance of precipitation is 40%.
Night: A slight chance of rain showers before 7pm, then a slight chance of showers and thunderstorms. Mostly cloudy, with a low around 60.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
68°20°–75°24°
Low, likely
58°14°–61°16°
Wind
16 mph26 km/h, gusts 37 mph59 km/h
UV peak
3
Friday, Oct 30. Showers. High 75°24°, low 58°14°. Rain 0.27 in6.9 mm, 20% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Cloudy, 64°18°
  20% chance · 0.09 in2.3 mm
2. Afternoon
  noon–6 PM
  Cloudy, 75°24°
  20% chance · 0.06 in1.5 mm
3. Evening
  6 PM–midnight
  Cloudy, 70°21°
  30% chance · 0.02 in0.5 mm
4. Overnight
  midnight–6 AM
  Drizzle, 63°17°
  40% chance · 0.02 in0.6 mm
Hours this far out come from computer models only.
Official NWS forecast
Day: A slight chance of rain showers. Partly sunny, with a high near 75.
Night: A chance of rain showers. Mostly cloudy, with a low around 58. Chance of precipitation is 40%.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
71°22°–79°26°
Low, likely
58°14°–65°18°
Wind
21 mph34 km/h, gusts 35 mph56 km/h
UV peak
2
Saturday, Oct 31. Showers. High 70°21°, low 59°15°. Rain 0.34 in8.6 mm, 70% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Drizzle, 62°17°
  40% chance · 0.04 in1.1 mm
2. Afternoon
  noon–6 PM
  Showers, 65°19°
  50% chance · 0.09 in2.3 mm
3. Evening
  6 PM–midnight
  Showers, 60°15°
  50% chance · 0.19 in4.7 mm
4. Overnight
  midnight–6 AM
  Drizzle, 61°16°
  40% chance · 0.09 in2.2 mm
Hours this far out come from computer models only.
Official NWS forecast
Day: Rain showers likely. Mostly cloudy, with a high near 70.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
64°18°–73°23°
Low, likely
57°14°–60°16°
Wind
21 mph33 km/h, gusts 35 mph56 km/h
UV peak
2
Sunday, Nov 1. Drizzle. High 66°19°, low 54°12°. Rain 0.29 in7.4 mm, 40% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Drizzle, 60°16°
  40% chance · 0.01 in0.4 mm
2. Afternoon
  noon–6 PM
  Drizzle, 64°18°
  30% chance · 0.15 in3.7 mm
3. Evening
  6 PM–midnight
  Cloudy, 58°14°
  30% chance · 0.02 in0.5 mm
4. Overnight
  midnight–6 AM
  Cloudy, 52°11°
  30% chance · 0.21 in5.3 mm
Hours this far out come from computer models only.
The National Weather Service writes about seven days ahead; this day is our model forecast only.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
62°17°–70°21°
Low, likely
42°6°–59°15°
Wind
18 mph28 km/h, gusts 32 mph51 km/h
UV peak
3
Monday, Nov 2. Cloudy. High 65°18°, low 51°11°. Rain 0.39 in9.9 mm, 30% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Mostly sunny, 55°13°
  30% chance · 0.11 in2.7 mm
2. Afternoon
  noon–6 PM
  Cloudy, 65°18°
  30% chance · 0.01 in0.3 mm
3. Evening
  6 PM–midnight
  Clear, 56°13°
  30% chance
Hours this far out come from computer models only.
The National Weather Service writes about seven days ahead; this day is our model forecast only.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
52°11°–77°25°
Low, likely
35°2°–60°16°
Wind
23 mph37 km/h, gusts 45 mph72 km/h
UV peak
3

10 days15 days30 days

The outlook

Today
Dry, high 79°, low 56°.
Tomorrow
Dry, high 77°, low 54°.
Monday
Dry, high 74°, low 57°, cooling off.
Rest of week
Highs 65–75°; chance of precipitation on Thursday, Saturday, Sunday.

Want the meteorologists’ reasoning? Read the NWS forecast discussion (DMX) (opens in a new tab)

What changed since yesterday

No meaningful changes from yesterday’s forecast.

Radar

Radar data: NOAA MRMS, rendered by forecast.blue

Radar loads when scrolled into view

Full-screen radar

Rivers

NOAA river gauges within 25 mi

Middle River near Indianola

11 mi

Below flood stage

Level: 8.5 ft
Flow: 350 cfs

Reading from Sat 8:15 PM · NWS gauge page

North River near Norwalk

11 mi

Below flood stage

Level: 7.9 ft
Flow: 276 cfs

Reading from Sat 8:15 PM · NWS gauge page

South River near Ackworth

13 mi

Below flood stage

Level: 5.3 ft
Flow: 78 cfs

Reading from Sat 8:15 PM · NWS gauge page

Raccoon River near West Des Moines

15 mi

Level: 30.2 ft

Reading from Sat 8:47 PM · NWS gauge page

Sun & moon

Sun

Daylight: 10 h 44 min; Losing 2 min 35 s a day; shortest Dec 21, 1 h 32 min less
Golden hour: 5:42–6:37 PM; Morning 7:19–8:15 AM
Blue hour: 6:37–6:48 PM; Morning 7:08–7:19 AM; first light 7:08 AM

Stars tonight? Poor

Clouds most of the night (about 69% cover).

Moon

Waxing gibbous

98% lit · growing

Today: sets 5:51 AM · rises 5:18 PM
Full moon: Oct 25
New moon: Nov 9

Looking west from St. Marys. A level horizon.Skyline from USGS elevation data, heights drawn up to 6× taller. Sky, sun and moon as they are now.

St. Marys, IA weather

Next 2 hours

Next 48 hours

Days ahead

The outlook

Today

Tomorrow

Monday

Rest of week

What changed since yesterday

Radar

Rivers

Middle River near Indianola

North River near Norwalk

South River near Ackworth

Raccoon River near West Des Moines

Sun & moon

Sun

Stars tonight? Poor

Moon