Click on a day for an hourly weather forecast
The temperatures in St. Louis in May are comfortable with low of 12°C and and high up to 21°C.
You can expect rain for roughly half of the month of May in St. Louis. We’re expecting roughly 8 to 15 days of rain, so your rubber boots and umbrella are going to see plenty of use this month if you’re keen on staying dry.
Our weather forecast can give you a great sense of what weather to expect in St. Louis in May 2025.
If you’re planning to visit St. Louis in the near future, we highly recommend that you review the 14 day weather forecast for St. Louis before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | -1° / -7° | 6 | 8 | 17 | 104 mm | Awful | St. Louis in January |
| February | 1° / -6° | 6 | 7 | 15 | 104 mm | Awful | St. Louis in February |
| March | 8° / 0° | 9 | 13 | 9 | 131 mm | Awful | St. Louis in March |
| April | 14° / 5° | 10 | 17 | 3 | 161 mm | Bad | St. Louis in April |
| May | 21° / 12° | 10 | 21 | 0 | 179 mm | Ok | St. Louis in May |
| June | 25° / 16° | 9 | 21 | 0 | 184 mm | Good | St. Louis in June |
| July | 27° / 17° | 9 | 22 | 0 | 165 mm | Good | St. Louis in July |
| August | 26° / 16° | 7 | 24 | 0 | 138 mm | Good | St. Louis in August |
| September | 23° / 13° | 6 | 24 | 0 | 109 mm | Perfect | St. Louis in September |
| October | 17° / 8° | 6 | 24 | 1 | 120 mm | Good | St. Louis in October |
| November | 9° / 2° | 7 | 18 | 5 | 107 mm | Awful | St. Louis in November |
| December | 3° / -2° | 8 | 11 | 12 | 102 mm | Awful | St. Louis in December |