Semi, Benin Climate
The warmest month is February, with an average high of 31°C; the coldest is August, with an average low of 23°C. A normal year brings 1290 mm of precipitation.
Temperature through the year
The normal daily high and low. The line marks today.
- Normal low
- Normal high
- Reanalysis extreme high
- Reanalysis extreme low
Normals for Sep 24
- Normal high
- 28°C
- Normal low
- 24°C
- Reanalysis high
- 29°Cin 2019
- Reanalysis low
- 23°Cin 1996
- Chance of a wet day
- 93%
- Daylight
- 12 h 06 min
Month by month
Averages for 1991-2020. Wet days have at least 1 mm of precipitation in the reanalysis. Each month links to its own page.
| Month | Avg high | Avg low | Warmest | Coldest | Precipitation | Wet days |
|---|---|---|---|---|---|---|
| January | 30°C | 24°C | 33°C (1992) | 15°C (2015) | 19 mm | 6.2 |
| February | 31°C | 25°C | 35°C (1998) | 18°C (2001) | 31 mm | 8.5 |
| March | 30°C | 26°C | 35°C (1998) | 21°C (2004) | 78 mm | 18.6 |
| April | 30°C | 26°C | 33°C (1998) | 23°C (1997) | 123 mm | 24.0 |
| May | 29°C | 26°C | 31°C (2008) | 23°C (1996) | 167 mm | 27.9 |
| June | 28°C | 25°C | 30°C (2018) | 23°C (1992) | 213 mm | 27.0 |
| July | 27°C | 23°C | 29°C (2014) | 21°C (2004) | 164 mm | 24.8 |
| August | 27°C | 23°C | 30°C (1998) | 21°C (1997) | 96 mm | 21.7 |
| September | 28°C | 24°C | 30°C (2003) | 22°C (2001) | 174 mm | 27.0 |
| October | 28°C | 24°C | 31°C (2018) | 22°C (1996) | 158 mm | 27.9 |
| November | 29°C | 25°C | 32°C (1998) | 21°C (1992) | 48 mm | 12.0 |
| December | 30°C | 24°C | 33°C (1992) | 19°C (2015) | 19 mm | 3.1 |
| Year | 29°C | 24°C | 1290 mm | 229 |
Precipitation
Rain and melted snow together. The chance of a wet day is the share of days with at least 1 mm of precipitation in the reanalysis.
1290 mm in a normal year, most in June.
Chance of a wet day
- Chance of a wet day
Humidity and comfort
NASA POWER reanalysis, 1991-2020, for the grid cell around Semi.
The muggiest month is September, when 101 percent of days are muggy or worse, with a mean dew point of 18°C or more.
| Month | Dew point | Humidity | Dry | Comfortable | Humid | Muggy | Oppressive | Miserable |
|---|---|---|---|---|---|---|---|---|
| January | 22°C | 76% | 1% | 8% | 11% | 12% | 47% | 22% |
| February | 23°C | 79% | 0% | 1% | 4% | 6% | 36% | 52% |
| March | 24°C | 83% | 0% | 0% | 1% | 1% | 17% | 81% |
| April | 25°C | 85% | 0% | 0% | 0% | 0% | 9% | 91% |
| May | 25°C | 87% | 0% | 0% | 0% | 0% | 12% | 88% |
| June | 24°C | 88% | 0% | 0% | 0% | 0% | 55% | 45% |
| July | 23°C | 88% | 0% | 0% | 0% | 0% | 97% | 3% |
| August | 22°C | 87% | 0% | 0% | 0% | 4% | 96% | 0% |
| September | 23°C | 88% | 0% | 0% | 0% | 1% | 93% | 7% |
| October | 24°C | 88% | 0% | 0% | 0% | 0% | 61% | 39% |
| November | 24°C | 84% | 0% | 0% | 1% | 2% | 46% | 52% |
| December | 22°C | 78% | 0% | 2% | 8% | 15% | 47% | 28% |
Comfort is judged by the day's mean dew point: dry below 13°C, comfortable to 16°C, humid to 18°C, muggy to 21°C, oppressive to 24°C, miserable above.
Clouds
Average share of the sky covered, from satellite (CERES and GEWEX SRB) by way of NASA POWER, 1991-2020.
The clearest month is December, with the sky 35 percent covered on average; the cloudiest is July, at 77 percent.
Wind
The mean wind speed over the whole day, from the MERRA-2 reanalysis by way of NASA POWER. Gusts run well above it.
The windiest month is August, averaging 14.8 km/h at 10 meters (33 feet) above the ground.
Daylight and sunshine
The longest day is Jun 14, with 12 h 30 min of daylight; the shortest is Dec 10, with 11 h 45 min.
- Day length
Solar energy
Average daily sunshine reaching the ground on a flat surface, in kilowatt-hours per square meter, clouds included.
Month pages
The weather in Semi in each month, day by day.
What this means
A normal is the average of the thirty years 1991 to 2020, the period the World Meteorological Organization and NOAA use for comparison. It is an average, not a forecast: most days depart from it, and some by a long way.
Where no station record is within reach, the extremes shown are the highest and lowest the reanalysis produced for the date in 1991-2020, not measured records.
Cloud, humidity, wind and sunshine come from a reanalysis: a weather model run over the past with every observation fed in, averaged over a grid cell about 50 km across. It is consistent everywhere on Earth; it smooths local detail such as a lake shore or a valley.
More for this place
Nearby
Sources
Cloud, humidity, wind and sunshine, and temperature and precipitation: NASA POWER (MERRA-2, CERES and GEWEX SRB), 1991-2020. The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center's Prediction Of Worldwide Energy Resources (POWER) project funded through the NASA Earth Science Division: POWER Daily API v2, accessed 2026-09-24. Sun and moon: computed with the NOAA solar equations and Meeus.