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

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

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

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

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

January

January in Northern Illinois is very cold and snowy. The average overnight temperatures in the area are in the 10s F (10+ below zero C), with a few days below 0 F (10+ below zero C). It tends to rain 5-10 days this month.

It also snows regularly. But the colder weather doesn't bring low humidity, which is in the 60% to 70% range on average.

What to wear/what to pack:

  • Scarf
  • Very heavy socks
  • Insulated boots
  • Pajamas, such as sweats
  • Gloves
  • Fleeces
  • Waterproof boots
  • Thermal undergarments
  • Multiple layer jacket shell
  • Waterproof coat
  • Umbrella
  • Sweaters

February

February in Northern Illinois is frosty and snowy. The snow can amount to several inches/centimeters.

During this time, temperatures average in the 20s F (single digits below 0 C) to 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:

  • Sweaters
  • Thermal undergarments
  • Gloves
  • Very heavy socks
  • Pajamas, such as sweats
  • Insulated boots
  • Waterproof coat
  • Fleeces
  • Umbrella
  • Waterproof boots
  • Scarf
  • Multiple layer jacket shell

March

March can be very chilly, snowy and somewhat rainy. Temperatures average in the 40s F (single digits C) during the day. It rains about a third of the time and snows once in a while.

What to wear/what to pack:

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

April

In April, Northern Illinois is relatively cool and somewhat rainy. Temperatures routinely are in the low 50s F (mid 10s C) and a bit less than half of the time jump into the 60s F (high 10s C) range. At night, lows are in the high 30s F (single digits C).

During your visit, you can expect a dusting of snow. This is also a rainy time for Northern Illinois, with several of the days of the month having rain. In April, humidity reaches as high as 60%.

What to wear/what to pack:

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

May

If you go to Northern Illinois in May, you will notice that it is mild and somewhat rainy. Expect it to rain about a third of the time. Daytime temperatures are in the low 70s F (low 20s C).

What to wear/what to pack:

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

June

June in Northern Illinois is pretty consistently hot and somewhat rainy. The rain can amount to several inches/centimeters.

During this time, temperatures average in the low 60s F (low 20s C) to low 80s F (high 20s C), although night temperatures can dip into the low 50s F (single digits C).

What to wear/what to pack:

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

July

If you vacation in Northern Illinois during July, you are likely to find that it can be sweltering and somewhat rainy. Temperatures tend to hover around the high 80s F (low 30s C) during the day, while at night they can dip into the low 60s F (high 10s C).

Humidity is generally between 50 and 60% during the day. In terms of precipitation, you can expect it to rain about a third of the time.

What to wear/what to pack:

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

August

If you vacation in Northern Illinois during August, you are likely to find that it is hot. Temperatures tend to hover around the 80s F (high 20s C) during the day, while at night they can dip into the low 60s F (mid 10s C).

Humidity is generally between 50 and 60% during the day. In terms of precipitation, you can expect it to rain a bit less than half of the time.

What to wear/what to pack:

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

September

September in Northern Illinois is warm. The rain can amount to several inches/centimeters. During this time, temperatures average in the high 70s F (mid 20s C), although night temperatures can dip into the low 50s F (single digits C).

What to wear/what to pack:

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

October

October for Northern Illinois is crisp. Temperatures average in the 60s F (high 10s C) during the day. It rains about a third of the time.

What to wear/what to pack:

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

November

If you are traveling to Northern Illinois in November, you will notice that it can be very chilly. Expect it to rain regularly. Daytime temperatures are in the high 40s F (single digits C).

What to wear/what to pack:

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

December

In December, Northern Illinois is frigid, snowy and somewhat rainy. Temperatures routinely are in the 30s F (single digits C) and 5-10 days this month jump into the low 40s F (single digits C) range. At night, lows are in the high 10s F (single digits below 0 C).

During your visit, you can expect several inches of snow. This is also a rainy time for Northern Illinois, with several of the days of the month having rain. In December, humidity reaches as high as 70%.

What to wear/what to pack:

  • Pajamas, such as sweats
  • Sweaters
  • Umbrella
  • Very heavy socks
  • Multiple layer jacket shell
  • Scarf
  • Fleeces
  • Thermal undergarments
  • Waterproof boots
  • Waterproof coat
  • Gloves
  • Insulated boots

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

Here are some general tips on what to wear in Northern 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 Northern Illinois

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