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.
O'Fallon Weather in June
With daytime temperatures of 30°C (86°F) and nighttime lows of 19°C (66°F), June in O'Fallon brings very high temperatures during the day. It is also the wettest month of the year, so pack an umbrella.
Rainfall in O'Fallon in June
Being the wettest month, having an umbrella on standby can help you avoid getting caught in the rain. Historically, approximately 12 days this month are expected to have rain, averaging 142 mm (5.6 in). When it rains this month, it tends to come down fairly heavily. Showers can be substantial even if they don't last all day.
Temperature in O'Fallon in June
June in O'Fallon brings typical temperatures with highs around 30°C (86°F) and lows of 19°C (66°F). It's usually most comfortable outside during the morning and later in the day. At 19°C (66°F) overnight, it can feel quite a bit cooler after dark. Worth packing something warmer for evenings, but the cooler temperatures are ideal for sleeping.
Sunshine in O'Fallon in June
Expect a lot of sunshine this month, with about 293 hours of sun. These sunny conditions add to the overall experience.If your ideal day consists of dry skies and pleasant temperatures, October typically offers the best circumstances for O'Fallon.
O'Fallon Temperature in June
Min Temperature
19°C (66°F)
Max Temperature
30°C (86°F)
Chance of Rain
40%
Precipitation
142 mm (5.6 in)
Rainy days
12 days
Humidity
67% *
Sunshine
293 hours *
Percentage Sunshine
66% *
* Data from: St. Louis, the United States of America (25 KM, 15 Miles).
O'Fallon Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in O'Fallon - and find the best time to visit.
Best Places in the United States of America in June
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 June →
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 O'Fallon in June
Warm weather calls for comfortable, breathable clothing in June. Cotton t-shirts, shorts, light dresses, and sandals are perfect. You might still want a light layer for evenings or air-conditioned places (for example buses). High rain levels are expected, so pack waterproof gear and an umbrella or poncho. Don't forget sun protection, sunglasses, sunscreen, and a hat. These are all good ideas with this much sunshine.
What To Do in O'Fallon in June
We rated the following activities from 1 (least suitable) to 10 (best) to do.
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Swimming9/10 -
Cycling7/10 -
Walking7/10 -
Camping6/10 -
Outdoor sports7/10
O'Fallon 3-Day Forecast
More climate data for O'Fallon
Temperature Rainfall Sunshine Humidity
See the full O'Fallon climate overview or explore weather in the United States of America.
Popular in June
Where to go in June - average daytime high across popular destinations.
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