San Luis weather in January

In January, San Luis sees average daytime highs of 71°F and overnight lows near 49°F, with 0.4 in of rain across 1.5 wet days and about 10.1 hours of daylight. It is the 11th-warmest and 5th-wettest month of the year here.

Highs climb over the month, from about 69°F in the first days to 73°F by the end. The sky is clear or mostly clear about 62% of the time in January, and the air most often feels dry.

Daylight stretches from about 9 h 54 min at the start of January to 10 h 24 min by month's end. Set against the rest of the year, January is San Luis's 11th-clearest and 5th-windiest month. For the whole year in context, see San Luis's year-round climate.

Daytime high: 71°; 11th warmest
Overnight low: 49°; 2nd coldest
Rainfall: 0.4 in; 1.5 wet days
Daylight: 10 h 06 min; 7:46 AM – 5:51 PM
Cloud cover: 33%; 11th clearest
Wind: 6 mph; 5th windiest
Solar energy: 3.71 kWh/m²
Travel score: 8.4; out of 10

San Luis is city in Yuma County, Arizona, United States.

Density: 356/km²; people per km²
Founded: 1930

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

← December San Luis year-round climate February →Best places to visit in January

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Temperature in January

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 69°F in the first days to 73°F by the end.

A typical January day in San Luis reaches about 71°F in the afternoon and slips back to 49°F overnight — a 22°F spread between the day's warmth and the night's chill. On most days the high lands between 63°F and 78°F. Set against its neighbours, January runs about 2°F warmer than December and about 4°F cooler than February.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Avg high (°F)	69	69	69	69	69	69	70	70	70	70	71	71	71	71	71	71	71	71	71	72	72	72	72	72	72	72	72	73	73	73	73
Avg low (°F)	47	48	48	48	48	48	48	49	49	49	49	49	49	49	49	49	49	49	49	50	50	50	50	50	50	50	50	50	50	50	50

	Avg high (°F)	Avg low (°F)
1	69	47
2	69	48
3	69	48
4	69	48
5	69	48
6	69	48
7	70	48
8	70	49
9	70	49
10	70	49
11	71	49
12	71	49
13	71	49
14	71	49
15	71	49
16	71	49
17	71	49
18	71	49
19	71	49
20	72	50
21	72	50
22	72	50
23	72	50
24	72	50
25	72	50
26	72	50
27	72	50
28	73	50
29	73	50
30	73	50
31	73	50

How January really feels in San Luis

Once humidity and wind are folded in, January averages 0 days that feel above 90°F and 0 that feel at or below 32°F — the comfort signal a plain temperature reading hides.

Days feeling ≥ 90°F

heat index over the day's high

Days feeling ≤ 32°F

wind chill below the day's low

January sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

San Luis weather by month

How January compares with the rest of the year at a glance. January is the 11th-warmest and 5th-wettest month here — the current month is highlighted below.

Month	High / Low (°F)	Rainfall (inches)	Wet days	Daylight (hours)	Travel score
Jan	71° / 49°	0.4	1.5	10.1	8.4
Feb	74° / 52°	0.5	2.3	10.8	8.6
Mar	81° / 56°	0.4	1.5	11.8	8.1
Apr	87° / 61°	0.1	0.6	12.8	6.1
May	95° / 68°	0.0	0.2	13.6	3.5
Jun	103° / 75°	0.0	0.2	14.1	0.7
Jul	106° / 83°	0.2	1.5	13.9	0.0
Aug	106° / 84°	0.4	2.9	13.2	0.0
Sep	101° / 78°	0.5	2.2	12.2	1.2
Oct	91° / 67°	0.2	0.9	11.2	4.9
Nov	78° / 56°	0.2	0.8	10.3	8.6
Dec	69° / 48°	0.4	1.7	9.9	8.2

Cloud cover in January

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 62% of the time in January.

Beyond those clear spells, partly cloudy skies cover about 13% of January, with mostly cloudy or overcast conditions the remaining 25%.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Clearer (%)	73	73	73	73	73	73	74	74	74	75	75	76	76	76	76	76	76	76	76	76	76	76	76	75	75	75	75	75	75	75	76
Cloudier (%)	27	27	27	27	27	27	26	26	26	25	25	24	24	24	24	24	24	24	24	24	24	24	24	25	25	25	25	25	25	25	24

	Clearer (%)	Cloudier (%)
1	73	27
2	73	27
3	73	27
4	73	27
5	73	27
6	73	27
7	74	26
8	74	26
9	74	26
10	75	25
11	75	25
12	76	24
13	76	24
14	76	24
15	76	24
16	76	24
17	76	24
18	76	24
19	76	24
20	76	24
21	76	24
22	76	24
23	76	24
24	75	25
25	75	25
26	75	25
27	75	25
28	75	25
29	75	25
30	75	25
31	76	24

Chance of precipitation in January

Any precipitation

San Luis gets around 0.4 in of rain over 1.5 wet days in January. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 5% and peaks near 6% on the wettest days.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Rain chance (%)	6	6	6	6	5	5	5	5	5	5	5	5	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	5	5	5

	Rain chance (%)
1	6
2	6
3	6
4	6
5	5
6	5
7	5
8	5
9	5
10	5
11	5
12	5
13	4
14	4
15	4
16	4
17	4
18	4
19	4
20	4
21	4
22	4
23	4
24	4
25	4
26	4
27	4
28	4
29	5
30	5
31	5

Humidity in January

DryComfortableHumidMuggyOppressiveMiserable

Most of January feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, January lands in the dry band about 99% of days. It rarely turns muggy — the humid and sticky bands barely register.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Dry (%)	100	100	100	100	100	100	100	100	100	100	100	100	100	100	99	99	99	99	99	99	99	99	99	99	99	99	99	99	99	99	99
Comfortable (%)	0	0	0	0	0	0	0	0	0	0	0	0	0	0	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1

	Dry (%)	Comfortable (%)
1	100	0
2	100	0
3	100	0
4	100	0
5	100	0
6	100	0
7	100	0
8	100	0
9	100	0
10	100	0
11	100	0
12	100	0
13	100	0
14	100	0
15	99	1
16	99	1
17	99	1
18	99	1
19	99	1
20	99	1
21	99	1
22	99	1
23	99	1
24	99	1
25	99	1
26	99	1
27	99	1
28	99	1
29	99	1
30	99	1
31	99	1

Wind in January

Winds average 6 mph in January.

Across January, daily wind ranges from about 6 mph on the calmest days to 6 mph at its breeziest. It stays fairly steady from day to day.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Wind speed (mph)	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6
Feels	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm

	Wind speed (mph)	Feels
1	6	calm
2	6	calm
3	6	calm
4	6	calm
5	6	calm
6	6	calm
7	6	calm
8	6	calm
9	6	calm
10	6	calm
11	6	calm
12	6	calm
13	6	calm
14	6	calm
15	6	calm
16	6	calm
17	6	calm
18	6	calm
19	6	calm
20	6	calm
21	6	calm
22	6	calm
23	6	calm
24	6	calm
25	6	calm
26	6	calm
27	6	calm
28	6	calm
29	6	calm
30	6	calm
31	6	calm

Sunrise & sunset in January

DaylightNight

Daylight runs from about 9 h 54 min at the start of January to 10 h 24 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 30 minutes over January. Sunrise moves from 7:45 AM to 7:41 AM, and sunset from 5:39 PM to 6:04 PM.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Daylight (h)	9.9	9.9	9.9	9.9	9.9	9.9	10.0	10.0	10.0	10.0	10.0	10.0	10.0	10.1	10.1	10.1	10.1	10.1	10.1	10.2	10.2	10.2	10.2	10.2	10.3	10.3	10.3	10.3	10.4	10.4	10.4
Sunrise (AM)	7:45	7:46	7:46	7:46	7:46	7:46	7:46	7:46	7:46	7:46	7:46	7:46	7:46	7:46	7:46	7:46	7:46	7:46	7:45	7:45	7:45	7:44	7:44	7:44	7:43	7:43	7:43	7:42	7:42	7:41	7:41
Sunset (PM)	5:39	5:40	5:41	5:41	5:42	5:43	5:44	5:44	5:45	5:46	5:47	5:48	5:48	5:49	5:50	5:51	5:52	5:53	5:54	5:54	5:55	5:56	5:57	5:58	5:59	6:00	6:01	6:02	6:03	6:03	6:04

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	9.9	7:45	5:39
2	9.9	7:46	5:40
3	9.9	7:46	5:41
4	9.9	7:46	5:41
5	9.9	7:46	5:42
6	9.9	7:46	5:43
7	10.0	7:46	5:44
8	10.0	7:46	5:44
9	10.0	7:46	5:45
10	10.0	7:46	5:46
11	10.0	7:46	5:47
12	10.0	7:46	5:48
13	10.0	7:46	5:48
14	10.1	7:46	5:49
15	10.1	7:46	5:50
16	10.1	7:46	5:51
17	10.1	7:46	5:52
18	10.1	7:46	5:53
19	10.1	7:45	5:54
20	10.2	7:45	5:54
21	10.2	7:45	5:55
22	10.2	7:44	5:56
23	10.2	7:44	5:57
24	10.2	7:44	5:58
25	10.3	7:43	5:59
26	10.3	7:43	6:00
27	10.3	7:43	6:01
28	10.3	7:42	6:02
29	10.4	7:42	6:03
30	10.4	7:41	6:03
31	10.4	7:41	6:04

Solar energy in January

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in January, about 3.71 kWh/m².

For context, solar energy here swings from a low near 3.4 kWh/m² to a high of 8.49 kWh/m² in June across the year — January's 3.71 kWh/m² sits near the bottom.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Solar energy (kWh/m²)	3.5	3.5	3.5	3.5	3.5	3.5	3.5	3.5	3.6	3.6	3.6	3.6	3.6	3.7	3.7	3.7	3.7	3.8	3.8	3.8	3.9	3.9	3.9	3.9	4.0	4.0	4.0	4.1	4.1	4.1	4.2
Level	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Bright	Bright	Bright	Bright	Bright	Bright

	Solar energy (kWh/m²)	Level
1	3.5	Moderate
2	3.5	Moderate
3	3.5	Moderate
4	3.5	Moderate
5	3.5	Moderate
6	3.5	Moderate
7	3.5	Moderate
8	3.5	Moderate
9	3.6	Moderate
10	3.6	Moderate
11	3.6	Moderate
12	3.6	Moderate
13	3.6	Moderate
14	3.7	Moderate
15	3.7	Moderate
16	3.7	Moderate
17	3.7	Moderate
18	3.8	Moderate
19	3.8	Moderate
20	3.8	Moderate
21	3.9	Moderate
22	3.9	Moderate
23	3.9	Moderate
24	3.9	Moderate
25	4.0	Moderate
26	4.0	Bright
27	4.0	Bright
28	4.1	Bright
29	4.1	Bright
30	4.1	Bright
31	4.2	Bright

Planning a trip in January

Is January a good time to visit San Luis?

Our two travel scores rate January for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

8.4

Sightseeing

3rd-best month of the year

5.6

Beach & pool

7th-best month of the year

January is one of the better times to visit San Luis for general sightseeing.

What to pack for San Luis in January

From January's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In January, San Luis sees daytime highs around 71°F and nights near 49°F. Little to plan around — just the basics.

UV index in San Luis in January

LowModerateHighVery highExtreme

Clear-sky midday UV in January peaks around 4 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in San Luis peaks around June 23 at about 11 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 18 at about 3 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
UV index (midday)	4	5	5	8	8	11	11	10	9	6	4	3
Level	Moderate	Moderate	Moderate	Very high	Very high	Extreme	Extreme	Very high	Very high	High	Moderate	Moderate

	UV index (midday)	Level
Jan	4	Moderate
Feb	5	Moderate
Mar	5	Moderate
Apr	8	Very high
May	8	Very high
Jun	11	Extreme
Jul	11	Extreme
Aug	10	Very high
Sep	9	Very high
Oct	6	High
Nov	4	Moderate
Dec	3	Moderate

Location & terrain

Where is San Luis?

San Luis sits at 32.5°N, 114.8°W, 131 ft above sea level, in United States. The nearest listed city is San Luis Río Colorado, 2.5 mi away.

Topography around San Luis

How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of San Luis.

Within 2 miles, the terrain around San Luis has only modest variations in elevation — a maximum elevation change of 89 ft around an average of 118 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 180 ft; within 50 miles, large variations in elevation — a maximum elevation change of 3,652 ft.

The land around San Luis is covered by artificial surfaces (46%), bare terrain (26%) and cropland (24%) within 2 miles, bare terrain (45%) and cropland (41%) within 10 miles, and bare terrain (73%) within 50 miles.

2 miles

89 ft

artificial surfaces 46%

10 miles

180 ft

bare terrain 45%

50 miles

3,652 ft

bare terrain 73%

treesshrubsgrasslandcroplandartificial surfacesbare terrainwaterwetland

← December San Luis year-round climate February →Best places to visit in January

January weather nearby: San Luis Río Colorado 2.5 mi · Somerton 8.7 mi · Yuma 19 mi · Ciudad Guadalupe Victoria 23 mi · Fortuna Foothills 25 mi · Puebla 34 mi · Mexicali 40 mi · Calexico 43 mi

United States travel facts

Power plugs: Type A / B; 120 V · 60 Hz
Prices: ≈ 100% of US; price level, 2025
GDP per capita: $90,027; 2025
Happiness: 6.8 / 10; World Happiness, 2025
Safe drinking water: 98%; of population, 2024
Homicide rate: 5.8; per 100k, 2023
Road deaths: 12.7; per 100k/yr, 2019
Income group: High; World Bank
Religion

Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.

Data sources

Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for San Luis (32.487°, -114.7822°, elevation 131 ft), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).

	Avg high (°F)	Avg low (°F)
1	69	47
2	69	48
3	69	48
4	69	48
5	69	48
6	69	48
7	70	48
8	70	49
9	70	49
10	70	49
11	71	49
12	71	49
13	71	49
14	71	49
15	71	49
16	71	49
17	71	49
18	71	49
19	71	49
20	72	50
21	72	50
22	72	50
23	72	50
24	72	50
25	72	50
26	72	50
27	72	50
28	73	50
29	73	50
30	73	50
31	73	50

	Clearer (%)	Cloudier (%)
1	73	27
2	73	27
3	73	27
4	73	27
5	73	27
6	73	27
7	74	26
8	74	26
9	74	26
10	75	25
11	75	25
12	76	24
13	76	24
14	76	24
15	76	24
16	76	24
17	76	24
18	76	24
19	76	24
20	76	24
21	76	24
22	76	24
23	76	24
24	75	25
25	75	25
26	75	25
27	75	25
28	75	25
29	75	25
30	75	25
31	76	24

	Rain chance (%)
1	6
2	6
3	6
4	6
5	5
6	5
7	5
8	5
9	5
10	5
11	5
12	5
13	4
14	4
15	4
16	4
17	4
18	4
19	4
20	4
21	4
22	4
23	4
24	4
25	4
26	4
27	4
28	4
29	5
30	5
31	5

	Dry (%)	Comfortable (%)
1	100	0
2	100	0
3	100	0
4	100	0
5	100	0
6	100	0
7	100	0
8	100	0
9	100	0
10	100	0
11	100	0
12	100	0
13	100	0
14	100	0
15	99	1
16	99	1
17	99	1
18	99	1
19	99	1
20	99	1
21	99	1
22	99	1
23	99	1
24	99	1
25	99	1
26	99	1
27	99	1
28	99	1
29	99	1
30	99	1
31	99	1

	Avg high (°F)	Avg low (°F)
1	69	47
2	69	48
3	69	48
4	69	48
5	69	48
6	69	48
7	70	48
8	70	49
9	70	49
10	70	49
11	71	49
12	71	49
13	71	49
14	71	49
15	71	49
16	71	49
17	71	49
18	71	49
19	71	49
20	72	50
21	72	50
22	72	50
23	72	50
24	72	50
25	72	50
26	72	50
27	72	50
28	73	50
29	73	50
30	73	50
31	73	50

	Clearer (%)	Cloudier (%)
1	73	27
2	73	27
3	73	27
4	73	27
5	73	27
6	73	27
7	74	26
8	74	26
9	74	26
10	75	25
11	75	25
12	76	24
13	76	24
14	76	24
15	76	24
16	76	24
17	76	24
18	76	24
19	76	24
20	76	24
21	76	24
22	76	24
23	76	24
24	75	25
25	75	25
26	75	25
27	75	25
28	75	25
29	75	25
30	75	25
31	76	24

	Rain chance (%)
1	6
2	6
3	6
4	6
5	5
6	5
7	5
8	5
9	5
10	5
11	5
12	5
13	4
14	4
15	4
16	4
17	4
18	4
19	4
20	4
21	4
22	4
23	4
24	4
25	4
26	4
27	4
28	4
29	5
30	5
31	5

	Dry (%)	Comfortable (%)
1	100	0
2	100	0
3	100	0
4	100	0
5	100	0
6	100	0
7	100	0
8	100	0
9	100	0
10	100	0
11	100	0
12	100	0
13	100	0
14	100	0
15	99	1
16	99	1
17	99	1
18	99	1
19	99	1
20	99	1
21	99	1
22	99	1
23	99	1
24	99	1
25	99	1
26	99	1
27	99	1
28	99	1
29	99	1
30	99	1
31	99	1

	Avg high (°F)	Avg low (°F)
1	69	47
2	69	48
3	69	48
4	69	48
5	69	48
6	69	48
7	70	48
8	70	49
9	70	49
10	70	49
11	71	49
12	71	49
13	71	49
14	71	49
15	71	49
16	71	49
17	71	49
18	71	49
19	71	49
20	72	50
21	72	50
22	72	50
23	72	50
24	72	50
25	72	50
26	72	50
27	72	50
28	73	50
29	73	50
30	73	50
31	73	50

	Clearer (%)	Cloudier (%)
1	73	27
2	73	27
3	73	27
4	73	27
5	73	27
6	73	27
7	74	26
8	74	26
9	74	26
10	75	25
11	75	25
12	76	24
13	76	24
14	76	24
15	76	24
16	76	24
17	76	24
18	76	24
19	76	24
20	76	24
21	76	24
22	76	24
23	76	24
24	75	25
25	75	25
26	75	25
27	75	25
28	75	25
29	75	25
30	75	25
31	76	24

	Rain chance (%)
1	6
2	6
3	6
4	6
5	5
6	5
7	5
8	5
9	5
10	5
11	5
12	5
13	4
14	4
15	4
16	4
17	4
18	4
19	4
20	4
21	4
22	4
23	4
24	4
25	4
26	4
27	4
28	4
29	5
30	5
31	5

	Dry (%)	Comfortable (%)
1	100	0
2	100	0
3	100	0
4	100	0
5	100	0
6	100	0
7	100	0
8	100	0
9	100	0
10	100	0
11	100	0
12	100	0
13	100	0
14	100	0
15	99	1
16	99	1
17	99	1
18	99	1
19	99	1
20	99	1
21	99	1
22	99	1
23	99	1
24	99	1
25	99	1
26	99	1
27	99	1
28	99	1
29	99	1
30	99	1
31	99	1