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Contents
- The climate of Semnan
- The best time to visit Semnan
- The worst time to visit Semnan
- Spring weather in Semnan
- Summer weather in Semnan
- Autumn weather in Semnan
- Winter weather in Semnan
- Weather in January
- Weather in February
- Weather in March
- Weather in April
- Weather in May
- Weather in June
- Weather in July
- Weather in August
- Weather in September
- Weather in October
- Weather in November
- Weather in December
- Frequently asked questions
- Average temperature
- Average humidity
- Average rainfall
- Average rainfall days
- Average snowfall days
- Average daylight
- Average sunshine
Climate and monthly weather forecast
The climate of Semnan
Geographically nestled in Iran, Semnan's climate is chiefly dictated by the Köppen climate classification Csa, denoting a hot mediterranean climate. An observant analysis of pertinent data dissects a wondrous dichotomy of climatic shifts from the extremes of chilly winters to sweltering summers.
Temperature peaks from 8.4°C (47.1°F) in January to an intense 37.8°C (100°F) around July and oscillates back downto 10.8°C (51.4°F) by December. Conversely, the thermometer's lower bracket shifts from -1°C (30.2°F) in January, gradually ascends to 24.9°C (76.8°F) in July, and descends to a hardened 1.2°C (34.2°F) in December.
A keen note must be made about rainfall and humidity changes. Rainfall vacillates from a modest 22mm (0.87") in January, declines to 2mm (0.08") in July and then swells to 20mm (0.79") in December. Days with rain are most common in March, with about 7, and are the least in September with fewer than 1. The relative humidity also fluctuates throughout the year, from a diluted 28% in the peak summer months, ballooning up to 63% in the more temperate January.
Winter months occasionally see a modest snowfall, with January usually experiencing around three days of snowfall - contrary to the rest of the months that stay free from snow. Sunshine hours experience a steady climb from 5.5 hours in January to 11.3 hours in June before receding back to 5.7 hours by December.
Temperature peaks from 8.4°C (47.1°F) in January to an intense 37.8°C (100°F) around July and oscillates back downto 10.8°C (51.4°F) by December. Conversely, the thermometer's lower bracket shifts from -1°C (30.2°F) in January, gradually ascends to 24.9°C (76.8°F) in July, and descends to a hardened 1.2°C (34.2°F) in December.
A keen note must be made about rainfall and humidity changes. Rainfall vacillates from a modest 22mm (0.87") in January, declines to 2mm (0.08") in July and then swells to 20mm (0.79") in December. Days with rain are most common in March, with about 7, and are the least in September with fewer than 1. The relative humidity also fluctuates throughout the year, from a diluted 28% in the peak summer months, ballooning up to 63% in the more temperate January.
Winter months occasionally see a modest snowfall, with January usually experiencing around three days of snowfall - contrary to the rest of the months that stay free from snow. Sunshine hours experience a steady climb from 5.5 hours in January to 11.3 hours in June before receding back to 5.7 hours by December.
The best time to visit Semnan
Given the climate intricacies, it becomes paramount to consider the optimal period for exploring Semnan. An ideal time is from April to June. During this time, daily high temperatures range from 23.9°C (75°F) to 35.4°C (95.7°F). These temperatures paired with an average relative humidity of 34%, make for a warm and comfortable experience, perfect for outdoor exploration. Additionally, the amalgamation of these conditions with a scarce rainfall of 14mm (0.55") to 3mm (0.12") and a lengthy daylight duration of 13.1 to 14.5 hours, complement sightseeing endeavors.
The worst time to visit Semnan
Travelling during the hot summer months of July and August might pose a challenge. Though rainfall is nearly absent, with less than 3mm (0.12") to 2mm (0.08") of precipitation, the scorching high temperatures ranging from 37.8°C (100°F) to 36.7°C (98.1°F) and low relative humidity of 28% can lead to uncomfortable, arid conditions.
Spring weather in Semnan
Spring in Semnan, from March to May, sees temperatures surge from 16.8°C (62.2°F) to 29.6°C (85.3°F), coupled with a welcoming decline in relative humidity from 48% to 35%. Rainfall experiences a fluctuation during this period, from 23mm (0.91") subsequently dwindling to 15mm (0.59") towards the end of the season. It is also the season with the most substantial leap in daylight hours, escalating from 12 to 14 hours.
Summer weather in Semnan
The summers, stretching from June to August, deliver extreme heat with high temperature readings from 35.4°C (95.7°F) up to 37.8°C (100°F). These temperatures are mitigated by a lower relative humidity level that dips to 28%. Rainfall dwindles to an almost negligible average of 2mm (0.08") to 3mm (0.12"). The daylight hours are at their peak during these months, averaging around 14.5 hours in June and slightly decreasing to approximately 13.5 hours by August.
Autumn weather in Semnan
Autumn, spanning from September to November, sees a substantial cooling off from the summer heat with temperatures sliding from 32.7°C (90.9°F) to 17.7°C (63.9°F). Humidity levels gradually increase from 30% to 48%. Despite the rise in humidity, rainfall remains comparably low, from 1mm (0.04") in September to 9mm (0.35") in November. The daylight hours also see a decrease during these months, winding down from 12.4 to 10.3 hours.
Winter weather in Semnan
Winters are relatively cold with high temperatures dropping from 10.8°C (51.4°F) in December to 8.4°C (47.1°F) in January and low temperatures from 1.2°C (34.2°F) dipping to -1°C (30.2°F) in January. Relative humidity during this period leans towards the higher side, peaking at 63% in January. Rainfall sees a spurt to 22mm (0.87") in December and slightly decreasing to 20mm (0.79") in February. Sunshine hours during winter months plunge to 5.7 to 5.5 hours during December and January respectively. January also witnesses about three days of snowfall, adding a brisk touch to the Semnan winter landscape.
Weather in January
Commencing the year, the weather in Semnan, Iran, is relatively chilly, with the mercury dipping under freezing at its lowest point. January is mixed with rainy and snowy days, both acting as precursors to the severe winter month that lies ahead. Weather in January »
Weather in February
As Semnan moves from January into February, a noticeable reduction in snowfall days becomes apparent, indicating the gradual shift towards spring. The month experiences a decline in relative humidity compared to its predecessor, giving rise to relatively dry air. Weather in February »
Weather in March
The transformation of weather in March in Semnan, Iran is an evident indication of spring. Compared to February, there's an appreciable increase in both the maximum and minimum temperatures. With a minimum temperature climbing to 5.5°C (41.9°F) and the maximum reaching a pleasant 16.8°C (62.2°F), the effects of the warming season become apparent. Weather in March »
Weather in April
April demonstrates a significant rise in temperatures in Semnan, Iran, as the city progresses deeper into spring. The advent of moderate weather fosters an increased daytime length, inviting more sunshine hours. Despite receiving slightly less rainfall than March, it remains sufficiently wet due to scattered showers. Weather in April »
Weather in May
May marks the transition from spring to summer in Semnan, Iran, manifesting in remarkably hot, dry days. With an increased number of sunshine hours, the city basks in extended daylight. The month is relatively dry, and the rainfall is less frequent compared to the previous month. Weather in May »
Weather in June
June ushers in the full power of summer in Semnan, Iran. As the city transitions from May to June, it experiences an observable escalation in heat. This month sees the least rainfall amongst its peers, endorsing most of the month with sun-soaked days. Weather in June »
Weather in July
In Semnan, Iran, July stands as the hottest month. The mercury only continues its upward climb from June, making the weather unbearably hot. The humidity stays low, which prevents the weather from becoming stiflingly oppressive. With the dearth of rain, the number of rainfall days dwindles, paving the way for clear skies. Weather in July »
Weather in August
As summer continues in Semnan, Iran, August maintains much of July's torrid climate. Despite a negligible reduction in temperatures, Semnan remains deep within the summer season. Rain showers are infrequent, translating to more sunshine hours. Weather in August »
Weather in September
With summer drawing to a close, September brings a palpable cooler change to Semnan, Iran. Rainfall begins to reappear slowly, albeit insignificantly, and the humidity picks up slightly. The length of daylight hours descends further, signifying the approaching autumn. Weather in September »
Weather in October
October ushers in the season of fall in Semnan, Iran. The weather starts to cool down significantly from September, allowing residents to experience the pleasant change. The city gets less sunshine and more rainfall, albeit not in substantial quantities. Weather in October »
Weather in November
November accentuates the transition to winter in Semnan, Iran, with temperatures dropping significantly from October. The city witnesses extended periods of lower sunshine hours as daylight become scarcer. Meanwhile, the humidity continues to rise, leading to a moisture-laden atmosphere compared to the past few months. Weather in November »
Weather in December
In December, Semnan, Iran, fully plunges into winter. With the shortest daylight hours and decreased sunshine, its residents experience more cloud cover. An increase in rainfall brings a sharp close to the dry season. The chill is intensified, with temperatures dropping drastically from November, and the reappearance of snowfall days signifies the city's return to winter. Weather in December »
Updated: Aug 29, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the coldest month?
In Semnan, January is the month with the lowest recorded average temperatures, measuring a high of 8.4°C (47.1°F) and a low of -1°C (30.2°F).
What is the most humid month?
The most humid month is January, with an average relative humidity of 63%.
How many days does it rain?
Throughout the year, in Semnan, there are 48.7 rainfall days, and 140mm (5.51") of precipitation is accumulated.
When does it snow?
January through March and December are months with snowfall in Semnan.
What is the snowiest month?
The month with the most snowfall days is January, when snow falls for 3.3 days.
How many days does it snow?
In Semnan, during the entire year, snow falls for 6.8 days.
What is the month with the least sunshine?
With an average of 5.5h of sunshine, January has the least sunshine of the year.
What is the wettest month in Semnan?
The month with the most rainfall is March, when the rain falls for 7.2 days and typically aggregates up to 23mm (0.91") of precipitation.
When it does not snow?
April through November are months without snowfall.
What are the least humid months?
June and July, with an average relative humidity of 28%, are the least humid months in Semnan.
When are the longest days?
The month with the longest days is June, with an average of 14h and 30min of daylight.
What month has the most sunshine?
The month with the most sunshine is June, with an average of 11.3h of sunshine.
What are the warmest months?
Semnan witnesses the warmest weather in July, with temperatures averaging a high of 37.8°C (100°F) and a low of 24.9°C (76.8°F).
What is the driest month?
The month with the least rainfall is September, when the rain falls for 0.8 days and typically collects 1mm (0.04") of precipitation.
What is the month with the shortest days?
December has the shortest days of the year, with an average of 9h and 48min of daylight.
Is there Daylight Saving Time (DST)?
Semnan does not utilize Daylight Saving Time (DST). +0330 timezone is used over the entire year.
Average temperature
Semnan, Iran
The warmest month (with the highest average high temperature) is July (37.8°C).
The month with the lowest average high temperature is January (8.4°C).
The month with the highest average low temperature is July (24.9°C).
The coldest month (with the lowest average low temperature) is January (-1°C).
Average humidity
Semnan, Iran
The month with the highest relative humidity is January (63%).
The months with the lowest relative humidity are June and July (28%).
Average rainfall
Semnan, Iran
- Average rainfall in January:
22.1mm - Average rainfall in February:
20.7mm - Average rainfall in March:
22.7mm - Average rainfall in April:
13.7mm - Average rainfall in May:
14.6mm - Average rainfall in June:
3.1mm
- Average rainfall in July:
1.9mm - Average rainfall in August:
3.1mm - Average rainfall in September:
1.4mm - Average rainfall in October:
7.6mm - Average rainfall in November:
9.1mm - Average rainfall in December:
19.5mm
The wettest month (with the highest rainfall) is March (22.7mm).
The driest month (with the least rainfall) is September (1.4mm).
Average rainfall days
Semnan, Iran
- Average rainfall days in January:
6.5 days - Average rainfall days in February:
5.2 days - Average rainfall days in March:
7.2 days - Average rainfall days in April:
6 days - Average rainfall days in May:
6.2 days - Average rainfall days in June:
2.4 days
- Average rainfall days in July:
1.4 days - Average rainfall days in August:
1.3 days - Average rainfall days in September:
0.8 days - Average rainfall days in October:
3.3 days - Average rainfall days in November:
3.3 days - Average rainfall days in December:
5.1 days
The month with the highest number of rainy days is March (7.2 days).
The month with the least rainy days is September (0.8 days).
Average snowfall days
Semnan, Iran
- Average snowfall days in January:
3.3 days - Average snowfall days in February:
1.7 days - Average snowfall days in March:
0.7 days - Average snowfall days in April:
0 days - Average snowfall days in May:
0 days - Average snowfall days in June:
0 days
- Average snowfall days in July:
0 days - Average snowfall days in August:
0 days - Average snowfall days in September:
0 days - Average snowfall days in October:
0 days - Average snowfall days in November:
0 days - Average snowfall days in December:
1.1 days
The month with the highest number of snowfall days is January (3.3 days).
The months with the least snowfall days are April, May, June, July, August, September, October and November (0 days).
Average daylight / Average sunshine
Semnan, Iran
- Average daylight in January:
10h and 1min - Average daylight in February:
10h and 5min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 1min - Average daylight in May:
14h and 0min - Average daylight in June:
14h and 3min
- Average daylight in July:
14h and 2min - Average daylight in August:
13h and 3min - Average daylight in September:
12h and 2min - Average daylight in October:
11h and 2min - Average daylight in November:
10h and 2min - Average daylight in December:
9h and 5min
The month with the longest days is June (Average daylight: 14h and 30min).
The month with the shortest days is December (Average daylight: 9h and 48min).
- Average sunshine in January:
5h and 3min - Average sunshine in February:
6h and 2min - Average sunshine in March:
6h and 3min - Average sunshine in April:
7h and 2min - Average sunshine in May:
9h and 0min - Average sunshine in June:
11h and 2min
- Average sunshine in July:
10h and 5min - Average sunshine in August:
10h and 5min - Average sunshine in September:
10h and 1min - Average sunshine in October:
8h and 2min - Average sunshine in November:
6h and 5min - Average sunshine in December:
5h and 4min
The month with the most sunshine is June (Average sunshine: 11h and 18min).
The month with the least sunshine is January (Average sunshine: 5h and 30min).
