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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