Ontario, California, United States of America: What to pack, what to wear, and when to go [2021]

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Traveling to Ontario, California, United States of America? If you're planning to go to Ontario, the following is some important information about when to go, what to wear, and what to pack.

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When to go to Ontario, California, United States of America

Based on the climate and weather in Ontario, the best time to go is May. See below for details.

Important esssentials for Ontario, California, United States of America

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

What to wear/what to pack for Ontario, California, United States of America by month

January

January in Ontario is mild. The average overnight temperatures in the area are in the 40s F (single digits C). With the colder weather comes lower humidity, which is in the 40% to 50% range on average.

What to wear/what to pack:

February

February in Ontario is balmy. The rain can amount to several inches/centimeters.

During this time, temperatures average in the 50s F (low 10s C) to 60s F (high 10s C), although night temperatures can dip into the low 40s F (single digits C).

What to wear/what to pack:

March

March in Ontario is mild. The rain can amount to several inches/centimeters.

During this time, temperatures average in the high 50s F (mid 10s C) to low 60s F (low 20s C), although night temperatures can dip into the low 40s F (single digits C).

What to wear/what to pack:

April

Traveling to Ontario in April, you will notice that it is warm. Daytime temperatures are in the 70s F (low 20s C).

What to wear/what to pack:

May

May is a perfect temperature. Temperatures average in the high 70s F (mid 20s C) during the day.

What to wear/what to pack:

June

June here is extremely hot. Temperatures average in the 80s F (low 20s C) during the day.

What to wear/what to pack:

July

If you go to Ontario in July, you will notice that it is unbearably hot. Daytime temperatures are in the low 90s F (low 30s C).

What to wear/what to pack:

August

If you go to Ontario in August, you will notice that it is scorchingly hot. Daytime temperatures are in the 90s F (mid 30s C).

What to wear/what to pack:

September

September can be sweltering. Temperatures average in the high 80s F (low 30s C) during the day.

What to wear/what to pack:

October

October is pretty consistently hot. Temperatures average in the low 80s F (high 20s C) during the day.

What to wear/what to pack:

November

If you go to Ontario in November, you will notice that it is balmy. Daytime temperatures are in the low 70s F (low 20s C).

What to wear/what to pack:

December

December in Ontario is mild. The average overnight temperatures in the area are in the low 40s F (single digits C). With the colder weather comes lower humidity, which is in the 40% to 50% range on average.

What to wear/what to pack:

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