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Saint Peters, MO Weather Forecast | 10 Days

Updated: Tue Oct 20th 2026 2:45 AM CDT

Tue, 10-20

73°F
49°F

Wed, 10-21

76°F
52°F

Thu, 10-22

77°F
53°F

Fri, 10-23

78°F
55°F

Sat, 10-24

80°F
56°F

Sun, 10-25

79°F
58°F

Mon, 10-26

74°F
56°F

Tue, 10-27

57°F
44°F

Wed, 10-28

48°F
28°F

Thu, 10-29

56°F
29°F

Sunny

Tue 10-20

Sunny with a high of 73°F and a low of 49°F. There's a very small chance of rainfall, only about 2%. Winds will be light at 6mph and gusts of 13.9mph at 2 PM. Humidity levels should be comfortable, sitting around 48% on average, the maximum being 66% at 7 AM and 30% being its lowest at 2 PM. Barometric pressure is its highest of 30.35^inHg at 9 AM, a lowest point of 30.24^inHg at 5 PM with an avg 30.29^inHg.

HI: 73°F
LO: 49°F

Rain: 2%
Snow: 0%

Wind
5.4 mph
Humidity
48% avg.

UV Index
4.5
Air Quality
Good

Sunrise
07:16 AM
Sunset
06:17 PM

Moonrise
03:42 PM
Moonset
01:41 AM
Moon Phase
Waxing Gibbous

Hourly

Sunny

Wed 10-21

Sunny with a high of 76°F and a low of 52°F. There's a very small chance of rainfall, only about 2%. Winds will be light at 4mph and gusts of 14.8mph at 1 PM. Humidity levels should be comfortable, sitting around 44% on average, the maximum being 55% at 7 AM and 28% being its lowest at 3 PM. Barometric pressure is its highest of 30.28^inHg at 9 AM, a lowest point of 30.17^inHg at 4 PM with an avg 30.23^inHg.

HI: 76°F
LO: 52°F

Rain: 2%
Snow: 0%

Wind
4 mph
Humidity
44% avg.

UV Index
4.6
Air Quality
Moderate

Sunrise
07:17 AM
Sunset
06:16 PM

Moonrise
04:04 PM
Moonset
02:42 AM
Moon Phase
Waxing Gibbous

Hourly

Sunny

Thu 10-22

Sunny with a high of 77°F and a low of 53°F. There's a very small chance of rainfall, only about 1%. Winds will be light at 6mph and gusts of 16.3mph at 1 PM. Humidity levels should be comfortable, sitting around 43% on average, the maximum being 58% at 7 AM and 28% being its lowest at 2 PM. Barometric pressure is its highest of 30.26^inHg at 10 AM, a lowest point of 30.16^inHg at 4 PM with an avg 30.21^inHg.

HI: 77°F
LO: 53°F

Rain: 1%
Snow: 0%

Wind
5.1 mph
Humidity
43% avg.

UV Index
4.6
Air Quality
Moderate

Sunrise
07:19 AM
Sunset
06:14 PM

Moonrise
04:26 PM
Moonset
03:41 AM
Moon Phase
Waxing Gibbous

Hourly

Sunny

Fri 10-23

Sunny with a high of 78°F and a low of 55°F. There's a very small chance of rainfall, only about 2%. Winds will be light at 9mph and gusts of 16.1mph at 10 PM. Humidity levels should be comfortable, sitting around 44% on average, the maximum being 55% at 7 AM and 28% being its lowest at 3 PM. Barometric pressure is its highest of 30.28^inHg at 11 AM, a lowest point of 30.19^inHg at 4 PM with an avg 30.23^inHg.

HI: 78°F
LO: 55°F

Rain: 2%
Snow: 0%

Wind
8.7 mph
Humidity
44% avg.

UV Index
4.4
Air Quality
Moderate

Sunrise
07:20 AM
Sunset
06:13 PM

Moonrise
04:47 PM
Moonset
04:42 AM
Moon Phase
Full Moon

Hourly

Overcast

Sat 10-24

Overcast with a high of 80°F and a low of 56°F. There's a very small chance of rainfall, only about 7%. Winds will be light at 9mph and gusts of 22.9mph at 10 PM. Humidity levels should be comfortable, sitting around 44% on average, the maximum being 56% at 6 AM and 26% being its lowest at 3 PM. Barometric pressure is its highest of 30.35^inHg at 9 AM, a lowest point of 30.25^inHg at 4 PM with an avg 30.29^inHg.

HI: 80°F
LO: 56°F

Rain: 7%
Snow: 0%

Wind
8.3 mph
Humidity
44% avg.

UV Index
7
Air Quality
Good

Sunrise
07:21 AM
Sunset
06:12 PM

Moonrise
05:10 PM
Moonset
05:43 AM
Moon Phase
Full Moon

Hourly

Overcast

Sun 10-25

Overcast with a high of 79°F and a low of 58°F. There's a very small chance of rainfall, only about 10%. Wind will be moderate, blowing around 11mph on average and gusts of 25.3mph at 10 PM. Humidity levels should be comfortable, sitting around 43% on average, the maximum being 56% at 7 AM and 28% being its lowest at 4 PM. Barometric pressure is its highest of 30.36^inHg at 10 AM, a lowest point of 30.25^inHg at 4 PM with an avg 30.3^inHg.

HI: 79°F
LO: 58°F

Rain: 10%
Snow: 0%

Wind
10.5 mph
Humidity
43% avg.

UV Index
6
Air Quality
TBA

Sunrise
07:22 AM
Sunset
06:10 PM

Moonrise
05:36 PM
Moonset
06:48 AM
Moon Phase
Full Moon

Hourly

Overcast

Mon 10-26

Overcast with a high of 74°F and a low of 56°F. There might be light rainfall having a 12% chance. Wind will be moderate, blowing around 13mph on average and gusts of 28.4mph at 7 PM. Humidity levels should be comfortable, sitting around 51% on average, the maximum being 76% at 11 PM and 31% being its lowest at 1 PM. Barometric pressure is its highest of 30.27^inHg at 12 AM, a lowest point of 30.14^inHg at 4 PM with an avg 30.21^inHg.

HI: 74°F
LO: 56°F

Rain: 12%
Snow: 0%

Wind
12.5 mph
Humidity
51% avg.

UV Index
5
Air Quality
TBA

Sunrise
07:23 AM
Sunset
06:09 PM

Moonrise
06:06 PM
Moonset
07:55 AM
Moon Phase
Full Moon

Hourly

Overcast

Tue 10-27

Overcast with a high of 57°F and a low of 44°F. There might be light rainfall having a 13% chance. Wind will be moderate, blowing around 16mph on average and gusts of 22.4mph at 10 PM. Humidity levels should be comfortable, sitting around 54% on average, the maximum being 81% at 1 AM and 30% being its lowest at 4 PM. Barometric pressure is its highest of 30.54^inHg at 11 PM, a lowest point of 30.24^inHg at 12 AM with an avg 30.39^inHg.

HI: 57°F
LO: 44°F

Rain: 13%
Snow: 0%

Wind
15.9 mph
Humidity
54% avg.

UV Index
3
Air Quality
TBA

Sunrise
07:24 AM
Sunset
06:08 PM

Moonrise
06:43 PM
Moonset
09:04 AM
Moon Phase
Waning Gibbous

Hourly

Sunny

Wed 10-28

Sunny with a high of 48°F and a low of 28°F. There's a very small chance of rainfall, only about 1%. Snow is likely with a 3% chance. Wind will be moderate, blowing around 13mph on average and gusts of 20.8mph at 12 AM. Humidity levels should be comfortable, sitting around 37% on average, the maximum being 56% at 7 AM and 20% being its lowest at 4 PM. Barometric pressure is its highest of 30.63^inHg at 9 AM, a lowest point of 30.43^inHg at 11 PM with an avg 30.54^inHg.

HI: 48°F
LO: 28°F

Rain: 1%
Snow: 3%

Wind
13 mph
Humidity
37% avg.

UV Index
3
Air Quality
TBA

Sunrise
07:25 AM
Sunset
06:07 PM

Moonrise
07:29 PM
Moonset
10:14 AM
Moon Phase
Waning Gibbous

Hourly

Overcast

Thu 10-29

Overcast with a high of 56°F and a low of 29°F. Rainfall expected to have a 62% chance with an estimated 0.19in. Wind will be moderate, blowing around 14mph on average and gusts of 18.8mph at 10 PM. Humidity levels should be comfortable, sitting around 43% on average, the maximum being 89% at 11 PM and 18% being its lowest at 3 PM. Barometric pressure is its highest of 30.42^inHg at 12 AM, a lowest point of 30.14^inHg at 4 PM with an avg 30.27^inHg.

HI: 56°F
LO: 29°F

Rain: 62% | est. 0.19in
Snow: 0%

Wind
13.2 mph
Humidity
43% avg.

UV Index
3
Air Quality
TBA

Sunrise
07:26 AM
Sunset
06:05 PM

Moonrise
08:25 PM
Moonset
11:22 AM
Moon Phase
Waning Gibbous

Hourly

This 10-Day weather forecast is valid for ZIP code 63376, accurately covering the area of Saint Peters, MO.

Currently

	52°F	30.32 inHg. Barometer 60% Humidity SSW 6.1 mph Wind
Partly Cloudy

Full Report

National Outlook

Flash Flooding Risk in Southwest & Coastal Showers in Northeast - 10-19 to 10-21

Mon Oct 19th 2026, 8:31am PDT

Read

East Coast Nor'easter and West Coast Heavy Rain Expected 10-22 to 10-26

Extended Forecast
Mon Oct 19th 2026, 8:36am PDT

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Weather Forecast Nearby

Missouri

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