Saint Peters, Missouri Climate by Month
Saint Peters, Missouri, United States
Hot summers and cold winters, with rain spread through the year.
Saint Peters has hot summers and cold winters, with rain spread through the year. Expect highs of 90°F (32°C) in July and 41°F (5°C) in January, with the coldest nights (January) near 22°F (-6°C). It gets 39 in (999 mm) of rain a year, spread across the months.
- Warmest month
- 90°F(32°C)
- Average high, July
- Coldest nights
- 22°F(-6°C)
- Average low, January
- Rain per year
- 39 in(999 mm)
- No clear rainy season
- Humidity
- 67%
- Sunniest: July
Best and worst months in Saint Peters
Best for weatherThe most comfortable weather comes in May and October, with highs around 74°F (24°C) and about 3.9 in (100 mm) of rain a month.
Least pleasantDecember and January are the least pleasant; January is the coldest, with highs of only 41°F (5°C).
Comfort combines how close the afternoon high is to 75°F (24°C) with how much rain falls and how humid it is. See where the weather is best in October.
Temperature and rain through the year
Highs and lows (°F)
Average highAverage low
Rain (in per month)
Saint Peters weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 41°F(5°C) | 22°F(-6°C) | 2.0 in(50 mm) | 68% | 1.8 |
| FebFebruary | 46°F(8°C) | 25°F(-4°C) | 2.1 in(53 mm) | 71% | 2.7 |
| MarMarch | 57°F(14°C) | 35°F(1°C) | 3.2 in(82 mm) | 67% | 3.8 |
| AprApril | 69°F(20°C) | 44°F(7°C) | 3.9 in(98 mm) | 64% | 4.8 |
| MayMayBest | 78°F(26°C) | 55°F(13°C) | 4.7 in(120 mm) | 67% | 5.4 |
| JunJune | 86°F(30°C) | 64°F(18°C) | 3.7 in(95 mm) | 67% | 6.1 |
| JulJuly | 90°F(32°C) | 68°F(20°C) | 4.3 in(108 mm) | 69% | 6.2 |
| AugAugust | 89°F(31°C) | 66°F(19°C) | 3.3 in(84 mm) | 69% | 5.6 |
| SepSeptember | 82°F(28°C) | 57°F(14°C) | 3.5 in(88 mm) | 65% | 4.7 |
| OctOctoberBest | 70°F(21°C) | 45°F(7°C) | 3.1 in(79 mm) | 61% | 3.2 |
| NovNovember | 56°F(13°C) | 35°F(2°C) | 3.1 in(79 mm) | 68% | 2.1 |
| DecDecember | 44°F(7°C) | 26°F(-3°C) | 2.5 in(63 mm) | 72% | 1.6 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
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