Climate ▸Forecast ▸December ▸January ▸
JanuaryFebruaryMarchAprilMayJuneJulyAugustSeptemberOctoberNovemberDecember

Harvey (IL) Weather and Climate: A Comprehensive Guide

Harvey experiences great temperature shifts. The city's weather can transition from warm days to very cold weather. It also has a notably wet climate with much precipitation. Now, let’s break down all the climate details for a clearer picture.

Average maximum day and minimum night temperature

The climate in Harvey is known for significant temperature differences throughout the year, making the weather dynamic. Average maximum daytime temperatures range from a comfortable 29°C in July, the warmest time of the year, to a very cold 0°C during cooler months like January.

At night, temperatures typically drop to an average of around -8°C during these months. Check out our detailed temperature page for more information.

Temperature ranges by month

Precipitation and rainy days

Harvey has a notably wet climate with abundant precipitation, recording 1060 mm of rain/snowfall per year. Significant seasonal changes in precipitation occur throughout the year. During the wetter season, August receives high rainfall, averaging 122 mm of precipitation, recorded across 11 rainy days. In contrast, the drier season, November brings less rainfall, with 54 mm over 8 rainy days. For more details, please visit our Harvey Precipitation page.

The mean monthly precipitation over the year, including rain, hail and snow

Sunshine over the year

Seasonal changes in sunshine hours are quite dramatic in Harvey. While July receives considerable daily sunshine with up to 10.6 hours, December marks the darkest time of the year, where sunshine is scarce with only 3.6 hours of sunlight per day. Visit our detailed sunshine hours page for more information.

Monthly hours of sunshine

Data from: Chicago, the United States of America (46 KM, 28 Miles).

Daily hours of sunshine

Data from: Chicago, the United States of America (46 KM, 28 Miles).

Forecast for Harvey (IL)

Wed   Dec 25
4°C | 0°C
NE 2 m/s
overcast and no rain

overcast and no rain

Thu   Dec 26
9°C | 2°C
SE 4 m/s
0.3 mm
broken clouds and  chance of slight rain

broken clouds and chance of slight rain

Fri   Dec 27
10°C | 5°C
SE 6 m/s
2.7 mm
overcast and rain

overcast and rain

The best time of year to visit Harvey in the United States of America

During the months of May and September you are most likely to experience good weather with pleasant average temperatures that fall between 20°C and 26°C.

Other facts from our historical weather data:
  • When is summer in Harvey?
    The hottest season / summer takes place in June, July, August and September.
  • Which is the warmest month in Harvey?
    July has an average maximum temperature of 29°C and is the warmest month of the year.
  • Which is the coldest month in Harvey?
    The coldest month is January with an average maximum temperature of 0°C.
  • Which is the wettest month in Harvey?
    August tops the wettest month list with 122 mm of rainfall.
  • Which is the driest month in Harvey?
    November is the driest month with 54 mm of precipitation.
  • Which is the sunniest month in Harvey?
    July is the sunniest month with an average of 319 hours of sunshine.

  • No idea where to travel to this year? We have a tool that recommends destinations based on your ideal conditions. Find out where to go with our weather planner.