St. Louis in May
In May, St. Louis averages 25°C (76°F) during the day and 14°C (58°F) at night, with frequent rain — about 20 days of the month see precipitation (130 mm total).
ShoulderConditions are comfortable for sightseeing without being sweltering. Expect daily rain or showers, often in heavy bursts.
May offers comfortable temperatures in St. Louis, with some rain to plan around.
How May compares to the rest of the year in St. Louis
May is in the middle of the year for warmth in St. Louis (5th of 12) and one of the wettest months (1st of 12). Daytime temperature runs 6°C above the annual average (19°C). May runs 6°C warmer than April (19°C) and warms a further 5°C into June (30°C).
May sunrise & sunset in St. Louis
Times shown for St. Louis local time (America/Chicago), calculated for the 15th of May. They shift by a few minutes day to day across the month.
Photography light in St. Louis — May
Golden-hour and blue-hour windows for the 15th of May, in St. Louis's local time. Use these for soft warm light (golden) or cool architectural twilight (blue).
📅 When to book — St. Louis in May
Travel writers usually only tell you when to go. Here's when to book flights and lodging for the best mix of price and availability, based on May's tier (Shoulder) and St. Louis's popularity.
Crowds & pricing — May in St. Louis
St. Louis is in a shoulder season month — fewer crowds, slightly lower prices, and a calmer atmosphere than peak weeks. Most major sights stay open with normal hours, though a handful of seasonal restaurants or boat trips may run reduced schedules. Many regulars consider these months the best time to visit because you trade a small amount of weather reliability for a much more pleasant on-the-ground experience.
Why this tier: comfortable tourism weather
Sun & mosquito risk — May in St. Louis
UV is a clear-sky sea-level estimate — clouds, altitude, and reflective surfaces (snow, water) shift it ±30%. Mosquito risk is climate-derived only; for current disease advisories (dengue, malaria, zika) check the CDC or WHO travel pages before your trip.
St. Louis in other months
| Month | Avg high | Avg low | Rainfall | Rain days | Snow days |
|---|---|---|---|---|---|
| January | 5°C / 41°F | -4°C / 25°F | 74 mm | 13 | — |
| February | 7°C / 45°F | -4°C / 26°F | 72 mm | 13 | — |
| March | 13°C / 56°F | 3°C / 37°F | 133 mm | 16 | — |
| April | 19°C / 66°F | 8°C / 46°F | 132 mm | 16 | — |
| May | 25°C / 76°F | 14°C / 58°F | 130 mm | 20 | — |
| June | 30°C / 86°F | 20°C / 67°F | 137 mm | 17 | — |
| July | 31°C / 87°F | 21°C / 70°F | 152 mm | 17 | — |
| August | 30°C / 85°F | 20°C / 69°F | 140 mm | 18 | — |
| September | 27°C / 81°F | 17°C / 63°F | 112 mm | 13 | — |
| October | 20°C / 68°F | 10°C / 51°F | 106 mm | 14 | — |
| November | 12°C / 54°F | 3°C / 37°F | 77 mm | 12 | — |
| December | 8°C / 46°F | -1°C / 31°F | 76 mm | 10 | — |
Other cities with similar May weather
🌍 See the full ranked list of climate twins for St. Louis in May →
Frequently asked questions
How hot is St. Louis in May?
In May, St. Louis averages a high of 25°C (76°F) and a low of 14°C (58°F) — generally warm.
Does it rain a lot in St. Louis in May?
May is quite rainy in St. Louis, with about 20 rainy days on average.
Is May a good time to visit St. Louis?
May is warm but on the rainy side. It suits travelers who are comfortable with warm weather; check the month-by-month ranking to compare it against the rest of the year.
What should I pack for St. Louis in May?
Pack light layers for warm days and cooler evenings, plus a compact umbrella or rain jacket. See the full May packing list for St. Louis for a complete, climate-based checklist.
Check the live 10-day forecast and sunrise/sunset.