Southern Illinois, Illinois, United States of America: What to pack, what to wear, and when to go [2018]

Traveling to Southern Illinois, Illinois, United States of America? If you're planning to go to Southern Illinois, here is some important information about when to go, what to wear, and what to pack:

When to go to Southern Illinois, Illinois, United States of America

Based on the climate and weather in Southern Illinois, the best time to go is September. See below for details.

What to wear/what to pack for Southern Illinois, Illinois, United States of America by month

January

January in Southern Illinois is pretty cool. The average overnight temperatures in the area are in the high 20s F (single digits below 0 C). It tends to rain about a third of the time.

What to wear/what to pack:

Cold weather footwear
Heavy jacket
Waterproof luggage
Gloves or mittens
Sweaters
Warm pants or jeans
Heavy socks
Waterproof footwear
Umbrella
Rain coat

February

February in Southern Illinois can be brisk. The rain/snow can amount to several inches/centimeters. During this time, temperatures average in the high 30s F (single digits C) to 40s F (single digits C).

What to wear/what to pack:

Gloves or mittens
Heavy jacket
Cold weather footwear
Waterproof footwear
Umbrella
Sweaters
Warm pants or jeans
Heavy socks
Waterproof luggage
Rain coat

March

If you vacation in Southern Illinois during March, you are likely to find that it is relatively cool. Temperatures tend to hover around the high 50s F (mid 10s C) during the day, while at night they can dip into the 30s F (single digits C).

In terms of precipitation, you can expect it to rain sometimes.

What to wear/what to pack:

Umbrella
Jacket or coat
Warm pants or jeans
Fleeces
Waterproof luggage
Rain coat
Socks
Standard footwear
Light gloves or mittens
Waterproof footwear

April

If you visit Southern Illinois during April, you are likely to find that it is balmy. Temperatures tend to hover around the low 60s F (low 20s C) during the day, while at night they can dip into the 40s F (single digits C).

In terms of precipitation, you can expect it to rain occasionally.

What to wear/what to pack:

Rain coat
Waterproof footwear
Standard footwear
Pants or jeans
Long skirts
Long sleeve shirts or blouses
Dresses
Socks
Umbrella
Waterproof luggage
Light jacket or fleece

May

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

In terms of precipitation, you can expect it to rain sometimes.

What to wear/what to pack:

Shorts or short pants
Sandals
Long and short sleeve shirts
Dresses
Sunscreen lotion
Waterproof footwear
Light footwear
Skirts
Umbrella
Rain coat
Waterproof luggage

June

If you are traveling to Southern Illinois in June, you will notice that it is really hot. Expect it to rain sometimes. Daytime temperatures are in the high 80s F (low 30s C).

What to wear/what to pack:

Umbrella
Short sleeve shirts
Sandals
Waterproof luggage
Dresses
Rain coat
Sunscreen lotion
Shorts
Sunglasses
Skirts
Waterproof footwear

July

July in Southern Illinois is consistently hot. The rain can amount to several inches/centimeters. During this time, temperatures average in the high 70s F (mid 20s C) to low 90s F (low 30s C).

What to wear/what to pack:

Sunglasses
Umbrella
Sunscreen lotion
Waterproof luggage
Skirts
Shorts
Waterproof footwear
Rain coat
Dresses
Short sleeve shirts
Sandals

August

August in Southern Illinois is really hot. The rain can amount to several inches/centimeters. During this time, temperatures average in the low 80s F (low 30s C).

What to wear/what to pack:

Umbrella
Sunscreen lotion
Shorts
Rain coat
Skirts
Short sleeve shirts
Waterproof footwear
Sunglasses
Sandals
Dresses
Waterproof luggage

September

If you are traveling to Southern Illinois in September, you will notice that it is extremely warm. Expect it to rain occasionally. Daytime temperatures are in the 80s F (high 20s C).

What to wear/what to pack:

Dresses
Waterproof footwear
Rain coat
Shorts
Short sleeve shirts
Waterproof luggage
Umbrella
Sunglasses
Sandals
Skirts
Sunscreen lotion

October

October in Southern Illinois is mild. The rain can amount to several inches/centimeters. During this time, temperatures average in the low 70s F (low 20s C), although night temperatures can dip into the low 30s F (single digits C).

What to wear/what to pack:

Sandals
Waterproof luggage
Umbrella
Sunscreen lotion
Rain coat
Light footwear
Shorts or short pants
Skirts
Long and short sleeve shirts
Dresses
Waterproof footwear

November

November in Southern Illinois is relatively cool. The rain can amount to several inches/centimeters. During this time, temperatures average in the high 50s F (mid 10s C).

What to wear/what to pack:

Umbrella
Warm pants or jeans
Waterproof luggage
Fleeces
Waterproof footwear
Standard footwear
Jacket or coat
Rain coat
Socks
Light gloves or mittens

December

December in Southern Illinois is pretty cool. The rain/snow can amount to several inches/centimeters. During this time, temperatures average in the 40s F (single digits C).

What to wear/what to pack:

Warm pants or jeans
Light gloves or mittens
Socks
Umbrella
Standard footwear
Waterproof luggage
Jacket or coat
Waterproof footwear
Rain coat
Fleeces

Year-round what to wear/what to pack for Southern Illinois, Illinois, United States of America

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

A plug adadpter that supports outlet types A and B
A SIM card that works in Southern Illinois

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