Yosemite National Park is definitely worth a visit
Vast forests, blue lakes, towering sequoias, and majestic waterfalls hint at the beauty of Yosemite National Park—a true natural masterpiece.
Alton Weather in May
May in Alton averages 24°C (75°F) during the day and 14°C (57°F) at night. Quite a bit of rainfall is typical this month, with around 107 mm (4.2 in) on average. An umbrella is a good idea.
Rainfall in Alton in May
Rain is expected on roughly 13 days, totalling around 107 mm (4.2 in) for the month. Individual showers can be quite heavy this month. A proper umbrella or rain jacket is worth having.
Temperature in Alton in May
May in Alton brings high temperatures, with highs of 24°C (75°F) and nights around 14°C (57°F). The days can feel warmer than the evenings, so packing for both parts of the day is a good idea. Nights drop to around 14°C (57°F), which is noticeably cooler than the daytime. A light jacket for the evening is a sensible addition, and the cool nights tend to make sleeping comfortable.
Sunshine in Alton in May
Expect sunny days throughout the month, with an estimated 269 hours of sunshine. This makes it a pleasant time to visit Alton.If your ideal day consists of dry skies and pleasant temperatures, September and October typically offer the best circumstances for Alton.
Alton Temperature in May
Min Temperature
14°C (57°F)
Max Temperature
24°C (75°F)
Chance of Rain
43%
Precipitation
107 mm (4.2 in)
Rainy days
13 days
Humidity
65% *
Sunshine
269 hours *
Percentage Sunshine
60% *
* Data from: St. Louis, the United States of America (29 KM, 18 Miles).
Alton Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Alton - and find the best time to visit.
Best Places in the United States of America in May
Find out more about the weather in the United States of America and which places have the best travel conditions in this month. See all of the United States of America in May →
perfect weather
pleasant
tolerable
unpleasant
poor
Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).
What to Wear in Alton in May
Comfortable temperatures call for an easy wardrobe in May. Pack summer basics like t-shirts and shorts, but include a light jacket for cooler moments. A pair of comfortable walking shoes is essential. Expect heavy rainfall, so bring good rain protection and waterproof bags. Don't forget sun protection, sunglasses, sunscreen, and a hat. These are all good ideas with this much sunshine.
What To Do in Alton in May
We rated the following activities from 1 (least suitable) to 10 (best) to do.
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Swimming9/10 -
Cycling9/10 -
Walking9/10 -
Camping6/10 -
Outdoor sports9/10
Alton 3-Day Forecast
More climate data for Alton
Temperature Rainfall Sunshine Humidity
See the full Alton climate overview or explore weather in the United States of America.
Popular in May
Where to go in May - average daytime high across popular destinations.
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Yosemite National Park is definitely worth a visit
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