Climate averages 1991–2020
Semnan weather
in April.
A mild, very dry month: the 7th warmest and the 10th driest of the year. Meets the pleasant-weather rule
Long-term climate patterns, not a forecast for a particular trip.
April is a mild month in Semnan: daytime highs average 21.9°C and nights cool to about 10.4°C. By daytime temperature it is the 7th warmest of the 12 months.
Expect about 13 mm of rain on roughly 3 days, which makes April a very dry month (the 10th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 13 h 04 min on an average April day.
The nearest other city in this atlas is Qā’em Shahr (110 km away). In April its highs average 20.0°C, 1.9°C cooler than Semnan, with 52 mm of rain.
Among the 128 cities listed in Iran, Semnan ranks 54th of 128 for the warmest April highs and joint 20th of 128 for the driest April (rainfall, lowest first). The mean April high of those 128 cities is 21.8°C; Semnan is 0.1°C warmer than that mean.
From April to May, average highs rise by 5.9°C to 27.7°C, and monthly rainfall falls from 13 mm to 4.8 mm.
The annual picture
April in context
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
Semnan climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 7.1°C-1.0°C | -1.0°C | 12 | 3.3 | 10.010 h |
| February | 9.6°C0.4°C | 0.4°C | 14 | 3.1 | 10.911 h |
| March | 15.3°C4.7°C | 4.7°C | 18 | 3.9 | 11.912 h |
| April, selected | 21.9°C10.4°C | 10.4°C | 13 | 2.8 | 13.113 h |
| May | 27.7°C15.2°C | 15.2°C | 4.8 | 1.3 | 14.014 h |
| June | 32.8°C19.5°C | 19.5°C | 1.2 | 0.3 | 14.515 h |
| July | 35.3°C22.4°C | 22.4°C | 1.0 | 0.3 | 14.314 h |
| August | 34.3°C21.7°C | 21.7°C | 1.2 | 0.3 | 13.514 h |
| September | 29.8°C18.0°C | 18.0°C | 1.7 | 0.5 | 12.412 h |
| October | 22.8°C12.5°C | 12.5°C | 4.5 | 1.2 | 11.311 h |
| November | 13.9°C5.8°C | 5.8°C | 11 | 3.1 | 10.310 h |
| December | 8.4°C1.2°C | 1.2°C | 10 | 3.2 | 9.810 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
April in nearby cities
- Qā’em Shahr in AprilIran · 110 kmHigh 20.0°C · Low 9.4°C · 52 mm rain
- Sari in AprilIran · 114 kmHigh 20.1°C · Low 9.5°C · 60 mm rain
- Behshahr in AprilIran · 125 kmHigh 20.7°C · Low 11.7°C · 50 mm rain
- Bābol in AprilIran · 126 kmHigh 19.6°C · Low 10.3°C · 52 mm rain
- Āmol in AprilIran · 136 kmHigh 17.7°C · Low 9.4°C · 87 mm rain
- Būmahen in AprilIran · 139 kmHigh 15.7°C · Low 6.6°C · 50 mm rain
- Pardīs in AprilIran · 144 kmHigh 14.7°C · Low 5.2°C · 50 mm rain
- Pākdasht in AprilIran · 155 kmHigh 22.5°C · Low 9.8°C · 31 mm rain
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 limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Semnan) is explained once on the Semnan year overview and on the Sources, method and limits page.