Onitsha Temperature by Month
The average annual maximum temperature in Onitsha, Nigeria is 33°C (91°F), with little variation between seasons. This page covers monthly averages, day-night differences, and how Onitsha compares to cities worldwide.
Onitsha Monthly Temperatures
The temperature in Onitsha remains steady throughout the year, providing a consistently very hot climate. Maximum daytime temperatures range from a very hot 37°C (99°F) in February to a comfortable 30°C (86°F) in July. Nights are mild year-round, with lows ranging from 25°C (77°F) in February to 23°C (73°F) in July.
The chart below illustrates the average maximum day and minimum night temperatures in Onitsha by month:
Temperatures tend to bottom out between 4 AM and 6 AM, then climb to their daily peak around 3 PM.
The chart below shows the average temperature throughout the year:
Historical Onitsha Temperatures: 1987-2026
Browse day-by-day temperature records for Onitsha spanning 40 years. Select any month and year to see actual high and low temperatures recorded on each day.
Temperature: Onitsha vs Nigeria
The map below shows the annual temperature across Nigeria. You can also select individual months if you want to compare a specific time of year.
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Onitsha vs World: Temperature Compared
Onitsha's average annual maximum temperature is 33°C (91°F). To put that in context, here's how it compares to a few well-known destinations:
Lisbon, Portugal averages 21°C (70°F) annually — warm summers, mild winters, and rain mainly in the cooler months.
Queenstown, New Zealand averages 10°C (50°F) annually — remember seasons are flipped, so its coldest months fall in June and July.
Shanghai, China averages 21°C (70°F) a year, with warm summers, mild winters, and a noticeable spring and autumn.
Brisbane, Australia averages 26°C (79°F) a year, with warm winters and hot, humid summers.
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.
Land Temperature: The average surface temperature across the Earth's land is around 14°C, but that figure hides enormous variation. In the Sahara, daytime temperatures can exceed 50°C. At the poles, averages fall below -30°C. Deserts are also notable for how quickly they cool at night — without moisture in the air to retain heat, temperatures can drop 30°C or more in just a few hours, making desert nights surprisingly cold.
Sea Temperature: The oceans average around 17°C at the surface — generally cooler than land. Because water absorbs and releases heat slowly, the sea acts as a buffer, keeping coastal climates more stable than inland areas. The deep ocean is a different story: below the sunlit upper layers, water stays near-freezing regardless of surface conditions.
Equatorial Regions: Near the equator, the sun is overhead year-round, producing consistent heat and fuelling tropical rainforests in places like the Amazon and Congo basins. Seasonal temperature variation is minimal, but these regions do experience distinct wet and dry seasons that shape their ecosystems.
Desert Regions: Desert temperatures swing wildly between seasons and even between day and night. The Sonoran Desert in North America can drop to 0°C on winter nights yet exceed 40°C on summer days. What all deserts share is very low rainfall — typically under 250mm per year.
Polar Regions: The Arctic and Antarctic experience extreme cold, with long stretches of darkness in winter and continuous daylight in summer. Arctic winter temperatures average around -30°C. In Antarctica's interior, it gets far colder — sometimes below -80°C in the coldest recorded spots.
Temperate Forests: Across North America, Europe, and East Asia, temperate forests see proper seasons — warm summers and cold winters, with average temperatures roughly between 5°C and 22°C depending on the time of year.
Mountain Regions: Temperature drops by roughly 6°C for every 1,000 metres of altitude. In ranges like the Andes or the Himalayas, that means you can move from temperate forest at lower elevations to permanent snow and ice at the peaks, all within a relatively short distance.
For more on Onitsha's weather — including monthly rainfall, sunshine hours, and humidity — visit our Onitsha climate page.
