Harvey (LA) Temperature by Month
The average annual maximum temperature in Harvey, Louisiana, United States of America is 26°C (79°F), with daytime highs ranging from 17°C (63°F) in January to 33°C (91°F) in July. This page covers monthly averages, day-night differences, and how Harvey compares to cities worldwide.
Harvey Monthly Temperatures
Visitors to Harvey will encounter a climate influenced by big temperature differences across the year. Nighttime temperatures range from 25°C (77°F) in July to 7°C (45°F) in January.
The chart below illustrates the average maximum day and minimum night temperatures in Harvey by month:
The coolest part of the day is typically between 4 AM and 6 AM, while 3 PM is usually the warmest, when solar heating is at its peak. July, the city's warmest month, averages 257 hours of sunshine.
The chart below shows the average temperature throughout the year:
Temperature: Harvey vs the United States of America
The map below shows the annual temperature across the United States of America. You can also select individual months if you want to compare a specific time of year.
very warm
warm
pleasant
moderate
cold
very cold
Harvey vs World: Temperature Compared
Harvey's average annual maximum temperature is 26°C (79°F). To put that in context, here's how it compares to a few well-known destinations:
Barcelona, Spain has an annual average of around 21°C (70°F), with warm summers and mild, fairly short winters.
Toronto, Canada averages 13°C (55°F) annually, with cold snowy winters balanced by genuinely warm summers.
Beijing, China averages 20°C (68°F) annually, but with big seasonal swings — very cold winters and hot summers.
Brisbane, Australia averages 26°C (79°F) a year, with warm winters and hot, humid summers.
What Does the Temperature Feel Like in Harvey?
Temperature alone doesn't tell the whole story — humidity plays a big role in how warm or cold it actually feels. High humidity in summer makes the heat feel more intense, particularly once temperatures climb above 25°C. In winter, the same humidity can make cold air feel sharper than the thermometer suggests.
In Harvey, January is the coolest month, with average highs of 17°C (63°F) and humidity around 75% — considered high. In July, the warmest month, temperatures average 33°C (91°F) with 79% humidity — conditions that feel high. For a full picture, see our humidity page.
Climate temperature data is typically calculated as a 30-year average. This smooths out year-to-year variability and gives a more reliable picture of what a place is actually like, rather than what happened in any single unusual year.
The readings come from a range of sources — land-based weather stations, ocean buoys, ships, and satellites. That data is collected by weather services around the world, then pooled, quality-checked, and averaged to produce the climate records you see here.
Global average temperatures have risen by around 1.2°C since the pre-industrial era, and the effects are visible across many regions. Winters are milder on average, with fewer frost days and less snow in many parts of the world. Heatwaves are more frequent and more intense, and Europe's summers of 2018, 2019, and 2020 all set records.
Summers are also getting drier in some areas, while winter rainfall has increased in others. This contributies to higher river levels and more flooding. In many countries, spring arrives earlier and autumn lasts longer. It has knock-on effects for wildlife, agriculture, and local ecosystems.
For more on Harvey's weather — including monthly rainfall, sunshine hours, and humidity — visit our Harvey climate page.
