Climate averages 1991–2020
Asmara weather
by month.
See how the year changes. June has the highest average daily maximum; October has the lowest average monthly rainfall.
Pleasant-weather months by our simple rule: SeptemberOctober
Long-term climate patterns, not a forecast for a particular trip.
Across the year Asmara averages a daytime high of 22.5°C and a nighttime low of 12.2°C, with about 807 mm of rain on roughly 155 days. June is the warmest month (average high 25.3°C) and December the coolest (20.3°C). August is the wettest month with 211 mm; October is the driest with 28 mm.
Months with pleasant weather by a simple rule (average high between 18°C and 29°C, average low of at least 5°C and at most 8 rain days): September and October. This looks at temperature and rain only, not humidity, wind, sea temperature or crowds.
The annual picture
A year in Asmara
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Asmara climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 20.5°C9.6°C | 9.6°C | 49 | 12.9 | 11.311 h |
| February | 22.0°C10.4°C | 10.4°C | 34 | 9.4 | 11.612 h |
| March | 23.3°C11.4°C | 11.4°C | 48 | 12.2 | 12.012 h |
| April | 23.8°C12.6°C | 12.6°C | 63 | 16.1 | 12.512 h |
| May | 24.5°C13.7°C | 13.7°C | 47 | 10.7 | 12.813 h |
| June | 25.3°C14.0°C | 14.0°C | 39 | 8.3 | 13.013 h |
| July | 22.5°C14.0°C | 14.0°C | 182 | 27.3 | 12.913 h |
| August | 22.1°C14.3°C | 14.3°C | 211 | 26.9 | 12.613 h |
| September | 23.4°C13.4°C | 13.4°C | 38 | 6.1 | 12.212 h |
| October | 22.0°C11.9°C | 11.9°C | 28 | 5.7 | 11.812 h |
| November | 20.9°C10.8°C | 10.8°C | 32 | 8.4 | 11.411 h |
| December | 20.3°C10.1°C | 10.1°C | 36 | 10.9 | 11.211 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
Nearby cities
- KerenEritrea · 71 kmHigh 28.4°C · Low 16.4°C · 493 mm rain a year
- AdwaEthiopia · 131 kmHigh 26.8°C · Low 12.8°C · 729 mm rain a year
- ĀdīgratEthiopia · 131 kmHigh 22.3°C · Low 11.8°C · 1,303 mm rain a year
- AksumEthiopia · 137 kmHigh 25.6°C · Low 12.6°C · 895 mm rain a year
- Inda SilasēEthiopia · 154 kmHigh 26.9°C · Low 15.0°C · 1,536 mm rain a year
- Mek'eleEthiopia · 213 kmHigh 24.2°C · Low 13.1°C · 877 mm rain a year
- KassalaSudan · 272 kmHigh 36.3°C · Low 22.7°C · 181 mm rain a year
- AlamataEthiopia · 332 kmHigh 27.1°C · Low 15.5°C · 798 mm rain a year
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsWhat do the high and low temperatures mean?
We average the daily maximum and daily minimum for each calendar month over 1991–2020. They are not record extremes, a forecast range or temperatures at a fixed time of day.
How is a rain day counted?
A local calendar day (standard time, UTC+3, no daylight saving) with at least 1 mm of total precipitation counts as one rain day. We count these for each year and month, then average across 30 years. The average does not predict which days will be wet.
Where do the numbers come from?
ERA5-Land (temperature) and ERA5 (precipitation) reanalysis from the Copernicus Climate Change Service, read from the Open-Meteo open-data archive. Temperature comes from the 0.1° model cell at 15.30°, 38.90° (5 km from the city centre), adjusted down by 0.2°C for the difference between the city's elevation (2,334 m) and the cell's (2,307 m). Rain comes from the 0.25° cell at 15.25°, 39.00°. These are model estimates, not weather-station readings; coast, hills and city streets can differ.
Does this page show sunshine, humidity or sea temperature?
No. The data used here contain air temperature and precipitation only. Daylight hours are calculated from the city's latitude (sunrise to sunset), not measured sunshine.