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Onitsha Weather by Month
Average temperatures, rainfall and humidity for Onitsha, Nigeria, month by month, built from OpenWeather’s historical records. Use it to see what a typical Onitsha month looks like before you travel — then check the live Onitsha forecast for the days ahead.
Warmest month
February
37°C average high
Coolest month
August
22°C average low
Wettest month
July
213 mm of rain
Driest month
December
12 mm of rain
Average temperature and rainfall in Onitsha by month
Averages of the daily highs and lows recorded in each month, with total rainfall, mean humidity and mean wind speed.
| Month | Avg high | Avg low | Record low / high | Rainfall | Humidity | Wind |
|---|---|---|---|---|---|---|
| January | 36°C | 22°C | 15°C / 40°C | 18 mm | 57% | 8 km/h |
| February | 37°C | 24°C | 18°C / 42°C | 29 mm | 60% | 9 km/h |
| March | 35°C | 25°C | 22°C / 42°C | 88 mm | 72% | 10 km/h |
| April | 34°C | 25°C | 22°C / 41°C | 103 mm | 76% | 10 km/h |
| May | 33°C | 24°C | 22°C / 38°C | 85 mm | 82% | 9 km/h |
| June | 30°C | 23°C | 21°C / 35°C | 130 mm | 89% | 9 km/h |
| July | 28°C | 22°C | 20°C / 33°C | 213 mm | 92% | 9 km/h |
| August | 28°C | 22°C | 20°C / 33°C | 181 mm | 91% | 10 km/h |
| September | 28°C | 23°C | 20°C / 33°C | 174 mm | 92% | 9 km/h |
| October | 30°C | 23°C | 21°C / 35°C | 115 mm | 88% | 8 km/h |
| November | 32°C | 23°C | 18°C / 37°C | 53 mm | 78% | 7 km/h |
| December | 35°C | 23°C | 16°C / 40°C | 12 mm | 60% | 7 km/h |
Best time to visit Onitsha
The most comfortable time to visit Onitsha is generally November to January, balancing mild daytime temperatures against the driest stretch of the year. The city has a moderate seasonal swing and rain concentrates around July, totalling about 1,201 mm a year.
Travellers who prefer heat should aim for February, when highs average 37°C. July is the month to avoid if rain would spoil your plans — it averages 213 mm, roughly 18× the rainfall of the driest month (December).
Source: OpenWeather historical and statistical weather data. Values are long-term averages, not a forecast — see the Onitsha forecast for what is happening now.