Iran · 1991–2020

Best time to visit
Semnan.

April leads for comfortable weather in Semnan: typically 24.3°C by day, 12.3°C at night, with 24 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortApril

Typical high24.3°C

Typical low12.3°C

Rain in April24 mm

Comfort

April

April · October · May

93climate match

Beach

May

May · September · June

88climate match

Outdoors

March

March · April · November

91climate match

The weakest month is January, scoring 22 against April’s 93 — days reach only 9.1°C, 15° below the 24°C the score treats as ideal.

Month by month

The whole year,
without the guesswork.

The bars show the comfort score. Day and night temperatures come from daily observed highs and lows; rain is the historical monthly estimate.

Jan

229.1° / -0.8°

Feb

3812.3° / 1.7°

Mar

6818.6° / 7°

Apr

9324.3° / 12.3°

May

7330.5° / 18.2°

Jun

4536° / 23.7°

Jul

3338.1° / 26.1°

Aug

4037.1° / 24.4°

Sep

6033.2° / 20.4°

Oct

9225.8° / 13.9°

Nov

5816.2° / 6.2°

Dec

3110.7° / 0.9°

Monthly climate evidence for Semnan — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	9.1°C	-0.8°C	16 mm	2.7	10 h	22	Good coverage
February	12.3°C	1.7°C	19 mm	2.9	10 h 50	38	Good coverage
March	18.6°C	7°C	20 mm	2.9	11 h 51	68	Good coverage
April	24.3°C	12.3°C	24 mm	4.1	13 h 02	93	Good coverage
May	30.5°C	18.2°C	11 mm	2.1	14 h 01	73	Good coverage
June	36°C	23.7°C	13 mm	1.1	14 h 33	45	Good coverage
July	38.1°C	26.1°C	4 mm	0.7	14 h 20	33	Good coverage
August	37.1°C	24.4°C	3 mm	0.6	13 h 30	40	Good coverage
September	33.2°C	20.4°C	3 mm	0.5	12 h 21	60	Good coverage
October	25.8°C	13.9°C	5 mm	1.1	11 h 13	92	Good coverage
November	16.2°C	6.2°C	12 mm	2.2	10 h 14	58	Good coverage
December	10.7°C	0.9°C	23 mm	2.6	9 h 46	31	Good coverage

Records at SEMNAN, 1973–2024
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	18.2°C28 Jan 2013	-12.6°C16 Jan 2008	21 mm30 Jan 2013	51 mm2006 · driest 0 mm in 2012	25
February	26.4°C23 Feb 2016	-8.8°C12 Feb 2020	45 mm2 Feb 2012	61 mm2012 · driest 0 mm in 2021	25
March	31.0°C30 Mar 2008	-5.6°C12 Mar 2012	20 mm22 Mar 2023	42 mm2007 · driest 0 mm in 2008	27
April	35.4°C30 Apr 2008	1.0°C1 Apr 2007	84 mm18 Apr 1992	110 mm1992 · driest 0 mm in 2001	25
May	38.4°C29 May 2016	6.0°C4 May 1978	30 mm11 May 2016	58 mm2021 · driest 0 mm in 2000	26
June	43.0°C28 Jun 2022	12.0°C3 Jun 1978	89 mm23 Jun 1991	89 mm1991 · driest 0 mm in 2008	30
July	44.4°C8 Jul 2021	16.8°C12 Jul 2004	28 mm12 Jul 2004	43 mm2004 · driest 0 mm in 2005	27
August	43.8°C8 Aug 2024	16.4°C31 Aug 2011	80 mm6 Aug 1990	80 mm1990 · driest 0 mm in 2000	29
September	39.6°C9 Sep 1991	11.4°C28 Sep 1991	32 mm18 Sep 2015	35 mm2015 · driest 0 mm in 1991	28
October	34.4°C4 Oct 2013	3.0°C26 Oct 2013	11 mm26 Oct 2019	28 mm2019 · driest 0 mm in 2005	30
November	27.2°C1 Nov 2017	-9.0°C25 Nov 2016	18 mm20 Nov 2011	46 mm2011 · driest 0 mm in 2000	26
December	20.2°C3 Dec 2010	-10.2°C18 Dec 2007	119 mm9 Dec 2004	128 mm2004 · driest 0 mm in 2017	27

Typical days per month at SEMNAN, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)
January	0	0	13	<1
February	<1	0	6	<1
March	2	<1	1	<1
April	13	2	0	<1
May	26	17	0	<1
June	25	24	0	<1
July	27	27	0	<1
August	27	27	0	0
September	28	25	0	<1
October	17	5	0	<1
November	<1	0	1	<1
December	0	0	8	<1

How often, not how much — every day in SEMNAN’s record sorted by what it was actually like, rather than averaged
Month	Warm & dry days	Wet days	Washouts	Week with 3+ wet days	Daytime mean has ranged
January	0%	8%	2%	4%	6.1–11.6°C
February	3%	10%	2%	6%	10.4–14.4°C
March	41%	9%	2%	5%	15.3–21.4°C
April	81%	12%	1%	7%	21.7–27.3°C
May	92%	8%	<1%	4%	29.0–32.2°C
June	96%	4%	<1%	3%	34.5–37.7°C
July	98%	2%	<1%	1%	36.8–39.6°C
August	98%	2%	<1%	2%	36.1–38.2°C
September	98%	2%	<1%	0%	32.1–34.9°C
October	90%	4%	<1%	4%	24.3–28.2°C
November	24%	7%	<1%	3%	14.1–18.8°C
December	<1%	7%	1%	6%	8.4–13.3°C

A warm and dry day reaches 20°C with under 1 mm of rain; a wet day gets 1 mm or more; a washout gets 10 mm or more. The week column is the share of seven-day stretches in that month, across the station’s whole daily record, that contained three or more wet days — the odds a week-long trip is rained on repeatedly, counted rather than modelled. The last column is the 10th to 90th percentile of that month’s daytime average across individual years: a narrow band means the average is what you will get, a wide one means the average is a midpoint between years that felt quite different.

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 116402
NOAA station: IRM00040757 · SEMNAN
Station distance: 9.4 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 15 usable years
Daylight: Calculated from latitude 35.58°, mid-month, sunrise to sunset including refraction. Not a station measurement.
Important limit: Historical climate is not a forecast. Nearby stations can miss mountains, coasts, and local microclimates.

These places read the same station, so their numbers are identical — distance from SEMNAN is what differs

Sorkheh→Lāsjerd→Dehāqīn→Cheheltan→Eslāmābād→Poshteh→

Or put two places side by side: Semnan vs Sorkheh

Best time to visitSemnan.

April

May

March

The whole year,without the guesswork.

Nearby, measured,and named.

Best time to visit
Semnan.

The whole year,
without the guesswork.

Nearby, measured,
and named.