Saint Peters, MO Weather Forecast for 5-Days

Updated: Mon May 18th 2026 10:00 AM CDT

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Saint Peters, MO Weather – 5-18 – Heavy Rain
89° / 67°
Heavy Rain
In Saint Peters, periods of rain are likely with highs near 89°F and lows around 67°F. The chance of rain is 85% with an estimated 2.16in. Wind will be moderate, blowing around 15mph on average and gusts of 28.8mph at 7 PM. High humidity with average of 81% is anticipated, the maximum being 96% at 2 PM and 67% being its lowest at 11 AM. Barometric pressure is its highest of 29.92inHg at 2 PM, a lowest point of 29.82inHg at 7 PM with an avg 29.88inHg.
Saint Peters, MO Weather – 5-19 – Moderate Rain
83° / 59°

Weather Tomorrow

Moderate Rain
It will rain at times in Saint Peters, with a high of 83°F and a low of 59°F. The chance of rain is 87% with an estimated 0.59in. Wind will be moderate, blowing around 16mph on average and gusts of 28.3mph at 1 AM. High humidity with average of 81% is anticipated, the maximum being 94% at 8 PM and 64% being its lowest at 3 AM. Barometric pressure is its highest of 30.14inHg at 11 PM, a lowest point of 29.86inHg at 1 AM with an avg 29.98inHg.
Saint Peters, MO Weather – 5-20 – Scattered Showers
62° / 54°
Scattered Showers
Showers likely at times in Saint Peters, with a high of 62°F and a low of 54°F. The chance of rain is 87% with an estimated 0.06in. Wind will be moderate, blowing around 14mph on average and gusts of 20mph at 4 AM. The humidity will be on the higher side, averaging about 80%, the maximum being 95% at 2 AM and 68% being its lowest at 1 PM. Barometric pressure is its highest of 30.24inHg at 8 AM, a lowest point of 30.14inHg at 3 AM with an avg 30.18inHg.
Saint Peters, MO Weather – 5-21 – Overcast
65° / 55°
Overcast
Highs will reach 65°F with lows near 55°F in Saint Peters, where cloud-filled skies are. Wind will be moderate, blowing around 12mph on average and gusts of 14.5mph at 5 PM. The humidity will be on the higher side, averaging about 76%, the maximum being 88% at 11 PM and 66% being its lowest at 2 AM. Barometric pressure is its highest of 30.18inHg at 12 AM, a lowest point of 30.05inHg at 11 PM with an avg 30.12inHg.
Saint Peters, MO Weather – 5-22 – Moderate Rain
66° / 57°
Moderate Rain
In Saint Peters, periods of rain are likely with highs near 66°F and lows around 57°F. The chance of rain is 86% with an estimated 0.57in. Winds will be light at 9mph and gusts of 12.1mph at 9 AM. High humidity with average of 96% is anticipated, the maximum being 99% at 11 AM and 88% being its lowest at 2 AM. Barometric pressure is its highest of 30.03inHg at 12 AM, a lowest point of 29.88inHg at 5 PM with an avg 29.94inHg.
Saint Peters, MO Weather – 5-23 – Moderate Rain
82° / 58°
Moderate Rain
In Saint Peters, it will rain at times with highs near 82°F and lows around 58°F. The chance of rain is 83% with an estimated 0.36in. Winds will be light at 9mph and gusts of 17.1mph at 10 PM. High humidity with average of 88% is anticipated, the maximum being 98% at 5 AM and 63% being its lowest at 4 PM. Barometric pressure is its highest of 30.02inHg at 11 PM, a lowest point of 29.93inHg at 4 PM with an avg 29.97inHg.

Currently

Light Rain 79°F
29.92 inHg.
Barometer
74%
Humidity
SSW 20.5 mph
Wind
Light Rain

5 Day Forecast Nearby

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