O'Fallon, Missouri, United States of America: What to pack, what to wear, and when to go [2022]

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Traveling to O'Fallon, Missouri, United States of America? If you're planning to go to O'Fallon, this is some important information about when to go, what to wear, and what to pack.

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About your travel guide

Hi! I'm Dev. I've traveled all over the world and in my travels, I have made many packing lists. In this series, my team and I have compiled the most useful information, as well as things we couldn't live without, to help you plan your trip.


When to go to O'Fallon, Missouri, United States of America

Based on the climate and weather in O'Fallon, the best time to go is September. See below for details.

Important essentials for O'Fallon, Missouri, United States of America

Here are some general tips on what to wear in O'Fallon, as well as several items to remember to pack when traveling there.

COVID-19 ESSENTIALS FOR 2022


  • N95 masks to use in crowded airports

    These N95 masks provide the best level of protection possible.


  • Travel disinfecting wipes

    Use these to sanitize plane and hotel surfaces.


  • Travel insurance

    If you or a companion get COVID-19, your amazing trip can be ruined. Good travel insurance can help. See plans


  • Kids' KN95 masks

    N95 masks are not available for kids. These are a good alternative (and can also be used by adults if N95 masks are not available).


  • Hand sanitizer

    This hand sanitizer is a good plane-friendly product.


  • A vaccine card protector

    Vaccine cards often get worn. An unreadable vaccine card may result in severe consequences. This vaccine card protector helps avoid that.

General health necessities

Don't forget these

What to wear/what to pack for O'Fallon, Missouri, United States of America by month

Already know when you're traveling?

January

January in O'Fallon can be brisk. The rain/snow can amount to several inches/centimeters. During this time, temperatures average in the high 20s F (single digits below 0 C) to high 30s F (single digits C), although night temperatures can dip into the single digits F (10+ below zero C).

What to wear/what to pack:

February

Traveling to O'Fallon in February, you will notice that it is cold. Daytime temperatures are in the 40s F (single digits C).

What to wear/what to pack:

March

March for O'Fallon is cool. Temperatures average in the 50s F (low 10s C) during the day.

What to wear/what to pack:

April

In April, O'Fallon is balmy. Temperatures routinely are in the high 60s F (low 10s C) and about half of the time jump into the low 70s F (low 20s C) range. At night, lows are in the 40s F (single digits C). This is also a rainy time for O'Fallon, with several of the days of the month having rain.

What to wear/what to pack:

May

If you vacation in O'Fallon during May, you are likely to find that it is warm. Temperatures tend to hover around the 70s F (mid 20s C) during the day, while at night they can dip into the low 50s F (low 10s C).

What to wear/what to pack:

June

If you go to O'Fallon in June, you will notice that it is extremely warm. Daytime temperatures are in the 80s F (high 20s C).

What to wear/what to pack:

July

If you vacation in O'Fallon during July, you are likely to see that it can be very hot. Temperatures tend to hover around the high 80s F (low 30s C) during the day, while at night they can dip into the high 60s F (low 10s C).

What to wear/what to pack:

August

August for O'Fallon is constantly hot. Temperatures average in the high 80s F (low 30s C) during the day.

What to wear/what to pack:

September

If you vacation in O'Fallon during September, you might notice that it is hot. Temperatures tend to hover around the low 80s F (high 20s C) during the day, while at night they can dip into the 50s F (low 10s C).

What to wear/what to pack:

October

If you visit O'Fallon during October, you may see that it is mild. Temperatures tend to hover around the high 60s F (low 20s C) during the day, while at night they can dip into the 40s F (single digits C).

What to wear/what to pack:

November

November in O'Fallon is relatively cool. The rain can amount to several inches/centimeters. During this time, temperatures average in the 50s F (low 10s C), although night temperatures can dip into the low 30s F (single digits C).

What to wear/what to pack:

December

December for O'Fallon is pretty cool. Temperatures average in the low 40s F (single digits C) during the day.

What to wear/what to pack:

Activities for O'Fallon, Missouri, United States of America

Here are some activity recommendations and activity-specific packing tips for O'Fallon.

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