Bandar-e Deylam climate — normals and trends
Bandar-e Deylam (Iran) has a hot semi-arid climate (BSh) under the Köppen-Geiger classification. Its mean annual temperature is 25.1 °C and it receives 315 mm of precipitation per year.
These figures are normals computed over 86 complete calendar years, from 1940 to 2025, using ERA5 reanalysis data from the Copernicus programme.
The warmest month is July (35.2 °C on average) and the coldest is January (13.4 °C). Rainfall peaks in December.
Bandar-e Deylam averages 0 frost days, 198 hot days (≥ 30 °C) and 30 rainy days per year.
Bandar-e Deylam has warmed by +1.8 °C between 1940 and 2025, or +0.21 °C per decade. This trend is statistically significant.
The hottest day of the period reached 48.8 °C (on 7 June 2018) and the coldest -2.3 °C (on 20 January 1964).
Data from ERA5 reanalysis (Copernicus Climate Change Service), redistributed under a CC-BY 4.0 licence. Normals are recomputed whenever the archive is updated.
Climate normals · ERA5
Bandar-e DeylamBushehr
- coords
- 30.05°, 50.16°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
25.1°C
Average daily high
30.3°C
Average daily low
20.2°C
Annual rainfall
315mm
Sunshine / day
11.0h
Mean relative humidity
50%
Average peak wind
21.1km/h
Seasonal range
21.8°C
Frost days (< 0 °C)
0 d/yr
Hot days (≥ 30 °C)
198 d/yr
Rainy days (≥ 1 mm)
30 d/yr
Annual snowfall
0.0 cm
Average feels-like high
29.7 °C
Average feels-like low
19.0 °C
Average peak gust
34.3 km/h
Tropical nights (≥ 20 °C)
192 d/yr
Solar radiation
20.8 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.8 °C
since 1940
+0.2 °C per decade · r² = 0.46 · p = < 0.001
Trend fitted by linear regression (ordinary least squares) on annual means. A trend is shown only when it is statistically significant (p < 0.05).
A climograph overlays rainfall (bars) and temperature (line): the standard reading in climatology, where you can see at a glance whether the warm season is also the dry one.
Records for the period
Hottest day
48.8 °C
7 June 2018
Coldest day
-2.3 °C
20 January 1964
Wettest day
141 mm
29 November 1957
Windiest day
54.2 km/h
26 March 1979
Strongest gust
86.0 km/h
25 March 2019
Hottest feels-like
50.5 °C
30 July 2020
Coldest feels-like
-8.1 °C
20 January 1964
Sunniest day
13.0 h
28 April 1940
Normals computed over complete calendar years 1940–2025.
A specific year
Pick a year and see how it compares to normal — warmer, drier or more extreme than usual?
Across the whole year
Month by month
| High | vs. normal | Precipitation | vs. normal | |
|---|---|---|---|---|
| Jan | 20.7 °C | +3.1 °C | 11 mm | -65 mm |
| Feb | 20.2 °C | +0.8 °C | 17 mm | -22 mm |
| Mar | 25.1 °C | +1.4 °C | 42 mm | +10 mm |
| Apr | 33.7 °C | +4.2 °C | 1 mm | -11 mm |
| May | 38.8 °C | +2.8 °C | 0 mm | -4 mm |
| Jun | 40.6 °C | +0.8 °C | 0 mm | 0 mm |
| Jul | 42.0 °C | +1.3 °C | 0 mm | -0 mm |
| Aug | 41.3 °C | +0.9 °C | 0 mm | -0 mm |
| Sep | 39.7 °C | +1.8 °C | 0 mm | -0 mm |
| Oct | 34.2 °C | +0.9 °C | 0 mm | -4 mm |
| Nov | 28.8 °C | +2.9 °C | 0 mm | -56 mm |
| Dec | 21.5 °C | +1.8 °C | 203 mm | +111 mm |
The year's extremes
What was the weather like that day?
Your birthday, a wedding, a memorable trip: discover the actual weather for any date since 1940.
Frequently asked questions
What is the climate of Bandar-e Deylam?
Bandar-e Deylam has a hot semi-arid climate (Köppen BSh). Over 1940-2025, the average annual temperature is 25.1 °C and it receives 315 mm of precipitation per year.
What is the hottest day ever recorded in Bandar-e Deylam?
The hottest day measured in Bandar-e Deylam between 1940 and 2025 was 7 June 2018, reaching 48.8 °C.
What is the coldest day in Bandar-e Deylam?
The coldest day measured in Bandar-e Deylam between 1940 and 2025 was 20 January 1964, at -2.3 °C.
Does it snow in Bandar-e Deylam?
Almost never: Bandar-e Deylam sees virtually no snow, with about 0 frost days per year.
Has the climate of Bandar-e Deylam warmed?
Yes: Bandar-e Deylam warmed by +1.8 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Bandar-e Deylam?
The wettest day measured in Bandar-e Deylam between 1940 and 2025 was 29 November 1957, with 141 mm of rain in 24 hours.
What was the windiest day in Bandar-e Deylam?
The windiest day measured in Bandar-e Deylam between 1940 and 2025 was 26 March 1979, with winds reaching 54.2 km/h.
What is the warmest month in Bandar-e Deylam?
The warmest month in Bandar-e Deylam is July (35.2 °C on average); the coldest is January (13.4 °C).
How much does it rain in Bandar-e Deylam?
Bandar-e Deylam receives on average 315 mm of precipitation per year, spread over about 30 rainy days.
Is it sunny in Bandar-e Deylam?
Bandar-e Deylam gets on average 11.0 hours of sunshine per day, roughly 4,015 hours per year over 1940-2025.
Are there tropical nights in Bandar-e Deylam?
Yes: Bandar-e Deylam has on average 192 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Bandar-e Deylam?
In Bandar-e Deylam, between 1940 and 2025, the highest apparent temperature reached 50.5 °C on 30 July 2020, and the lowest was -8.1 °C on 20 January 1964.
Compare Bandar-e Deylam with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Bandar-e Deylam