Dallas climate

Name: Dallas
Address: US

Dallas is warmest in August, with average highs of 35 °C, and coldest in January, when nights average 4.1 °C. May is the wettest month (132 mm) and July the driest (44 mm). Figures are 1991–2020 climate normals.

Across a full year Dallas averages 1,043 mm of rain, 191 days above 25 °C and 16 days below freezing.

United States · 128 m elevation · population 1,326,087 · 1991–2020 normals

Temperature below 0 °C to above 30 °C Rain band height is that month’s share of the wettest month

Warmest month August 35 °C
Coldest month January 4.1 °C
Driest month July 44 mm
Wettest month May 132 mm
Least cloud September 38 % cloud
Hottest on record July 43 °C
Coldest on record January -10 °C

What to expectDallas through the year

Dallas has a clear annual cycle: average daily highs run from 14 °C in January to 35 °C in August, a swing of 22 °C in mean temperature across the year.

Counted across a normal year, 191 days a year reach 25 °C, 117 of them reach 30 °C, 16 nights drop below freezing. The warmest reading in the 1991–2020 record is 43 °C, in July.

Rain is strongly seasonal. May averages 132 mm against 44 mm in July — 3.0 times as much. Planning around the dry months matters more here than planning around temperature.

Month by month

Month	Avg high	Rainfall	Cloud
January	13.9 °C	73 mm	50 %
February	16.3 °C	78 mm	53 %
March	20.4 °C	102 mm	53 %
April	24.7 °C	107 mm	49 %
May	28.3 °C	132 mm	54 %
June	32.1 °C	90 mm	45 %
July	34.6 °C	44 mm	39 %
August	34.7 °C	59 mm	38 %
September	31.0 °C	75 mm	38 %
October	25.7 °C	104 mm	39 %
November	19.2 °C	89 mm	45 %
December	14.6 °C	91 mm	50 %

Temperature month by month

Month	Avg high	Avg low	Mean	Record high	Record low	Days above 25 °C	Days above 30 °C	Days below 0 °C
January	13.9 °C	4.1 °C	8.1 °C	27.6 °C	-10.3 °C	0	0	6
February	16.3 °C	6.1 °C	10.3 °C	32.1 °C	-10.3 °C	1	0	4
March	20.4 °C	9.9 °C	14.4 °C	31.4 °C	-7.4 °C	5	0	1
April	24.7 °C	14.1 °C	18.8 °C	37.2 °C	2.3 °C	16	2	0
May	28.3 °C	18.7 °C	23.1 °C	37.5 °C	6.4 °C	26	9	0
June	32.1 °C	22.9 °C	27.3 °C	39.8 °C	15.1 °C	30	23	0
July	34.6 °C	25.2 °C	29.8 °C	42.5 °C	18.7 °C	31	30	0
August	34.7 °C	25.3 °C	29.9 °C	42.4 °C	16.9 °C	31	28	0
September	31.0 °C	21.5 °C	25.9 °C	41.9 °C	10.0 °C	28	19	0
October	25.7 °C	15.7 °C	20.2 °C	35.7 °C	-0.7 °C	19	5	0
November	19.2 °C	9.9 °C	13.9 °C	32.8 °C	-5.3 °C	4	0	1
December	14.6 °C	5.4 °C	9.3 °C	29.6 °C	-7.2 °C	0	0	4

Rain, sun and wind month by month

Month	Rainfall	Wet days	Daylight	Cloud cover	Humidity	Wind
January	73 mm	7	10 h/day	50 %	68 %	22 km/h
February	78 mm	8	11 h/day	53 %	68 %	22 km/h
March	102 mm	9	12 h/day	53 %	67 %	23 km/h
April	107 mm	9	13 h/day	49 %	66 %	24 km/h
May	132 mm	10	14 h/day	54 %	70 %	22 km/h
June	90 mm	8	14 h/day	45 %	68 %	19 km/h
July	44 mm	6	14 h/day	39 %	60 %	18 km/h
August	59 mm	6	13 h/day	38 %	58 %	16 km/h
September	75 mm	6	12 h/day	38 %	62 %	17 km/h
October	104 mm	7	11 h/day	39 %	64 %	19 km/h
November	89 mm	7	10 h/day	45 %	68 %	21 km/h
December	91 mm	7	10 h/day	50 %	69 %	21 km/h

How Dallas compares

The same four figures for nearby destinations, so the numbers above have something to be read against. Summer high is the warmest month's average high; winter low is the coldest month's average low.

Destination	Summer high	Winter low	Rain per year	Days above 25 °C
Dallas	35 °C	4.1 °C	1,043 mm	191
Plano · United States	34 °C	3.6 °C	1,079 mm	182
Arlington · United States	35 °C	4.0 °C	988 mm	192
Fort Worth · United States	35 °C	3.9 °C	950 mm	194

Where Dallas ranks

Ranking	Position	Value
The warmest places in North America in August	22ndof 50	35 °C
The warmest places in North America in July	26thof 50	35 °C
The warmest places in North America in June	46thof 50	32 °C

Planning a trip? See the best time to visit Dallas.

QuestionsCommon questions about Dallas’s climate

When is the best time to visit Dallas?

That depends on what you want, so the honest answer is a comparison rather than a single month. April, May, October sit closest to 20 °C on average, August is the warmest month and July the driest. The month-by-month table above has the full picture.

How hot does Dallas get?

In August, the warmest month, daily highs average 35 °C. About 117 days a year pass 30 °C. The highest value in the 1991–2020 record is 43 °C.

How cold does it get in winter?

Nights average 4.1 °C in January, the coldest month. A normal year has 16 nights below freezing.

Which month is wettest in Dallas?

May, averaging 132 mm over 10 days with rain. The driest month is July with 44 mm. The year as a whole averages 1,043 mm.

Are these figures a forecast?

No. They are 1991–2020 climate normals: the average of thirty years, which describes what a month is usually like in Dallas rather than what any particular week will bring. Individual years can differ substantially from the normal.

Data sources and method

ERA5 / ERA5-Land reanalysis — Copernicus Climate Change Service (C3S), ECMWF. Copernicus Licence
Open-Meteo — Open-Meteo.com. CC BY 4.0
NOAA OISST v2.1 — NOAA Physical Sciences Laboratory. Public domain
GeoNames — GeoNames.org. CC BY 4.0

Normal period: 1991–2020
Dataset version: era5-1991-2020-scores1.1
Last processed: 1 August 2026

Measured values come from ERA5 reanalysis and are reproduced unchanged. Calculated by us: monthly rankings, daylight hours, beach and comfort scores. Full formulas are on the methodology page.

Contains modified Copernicus Climate Change Service information 2026. Neither the European Commission nor ECMWF is responsible for any use that may be made of the Copernicus information or data it contains.