Mira Mesa weather in December

In December, Mira Mesa sees average daytime highs of 63°F and overnight lows near 50°F, with 2.1 in of rain across 5.3 wet days and about 9.9 hours of daylight. It is the 10th-warmest and 4th-wettest month of the year here.

Day-to-day highs hold fairly steady near 63°F through the month. The sky is clear or mostly clear about 52% of the time in December, and the air most often feels dry.

Daylight stretches from about 10 hours at the start of December to 9 h 54 min by month's end. Set against the rest of the year, December is Mira Mesa's 9th-clearest and 10th-windiest month. For the whole year in context, see Mira Mesa's year-round climate.

Daytime high
63°
10th warmest
Overnight low
50°
2nd coldest
Rainfall
2.1 in
5.3 wet days
Daylight
9 h 48 min
6:50 AM – 4:40 PM
Cloud cover
42%
9th clearest
Wind
5 mph
10th windiest
Solar energy
3.11 kWh/m²
Travel score
6.4
out of 10

Mira Mesa is human settlement in San Diego, California, United States of America.

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

Temperature in December

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 63°F through the month.

A typical December day in Mira Mesa reaches about 63°F in the afternoon and slips back to 50°F overnight — a 13°F spread between the day's warmth and the night's chill. On most days the high lands between 57°F and 68°F. Set against its neighbours, December runs about 5°F cooler than November and on par with January.

40°50°60°70°80°151015202531
Avg high (°F)Avg low (°F)
16451
26451
36451
46451
56451
66451
76451
86350
96350
106350
116350
126350
136350
146350
156350
166249
176249
186249
196249
206249
216249
226249
236249
246249
256249
266249
276249
286249
296249
306249
316249

Mira Mesa weather by month

How December compares with the rest of the year at a glance. December is the 10th-warmest and 4th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysDaylight (hours)Travel score
Jan62° / 49°2.75.910.16.2
Feb62° / 50°3.46.710.86.0
Mar63° / 52°2.25.911.76.4
Apr65° / 55°1.03.512.87.3
May67° / 58°0.51.813.77.8
Jun70° / 60°0.10.414.18.7
Jul74° / 64°0.10.5149.3
Aug76° / 66°0.00.113.29.5
Sep75° / 65°0.10.612.29.3
Oct72° / 60°0.72.411.28.5
Nov67° / 54°1.13.410.37.6
Dec63° / 50°2.15.39.96.4

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 52% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 12% of December, with mostly cloudy or overcast conditions the remaining 36%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
16733
26733
36634
46634
56634
66535
76436
86436
96436
106436
116436
126436
136436
146436
156436
166436
176436
186337
196337
206337
216337
226337
236337
246337
256238
266238
276139
286238
296139
306139
316139

Chance of precipitation in December

Any precipitation

Mira Mesa gets around 2.1 in of rain over 5.3 wet days in December. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 18% and peaks near 19% on the wettest days.

0%10%20%30%151015202531
Rain chance (%)
116
216
316
417
517
617
717
817
917
1017
1118
1218
1318
1418
1518
1618
1718
1818
1918
2018
2118
2218
2318
2418
2518
2618
2718
2818
2918
3019
3119

Humidity in December

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, December lands in the dry band about 96% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)
1928
2928
3928
4928
5928
6937
7937
8937
9937
10946
11946
12946
13955
14955
15964
16964
17964
18973
19973
20982
21982
22982
23982
24982
25982
26982
27982
28982
29982
30982
31982

Wind in December

Winds average 5 mph in December.

Across December, daily wind ranges from about 5 mph on the calmest days to 5 mph at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (mph)Feels
15calm
25calm
35calm
45calm
55calm
65calm
75calm
85calm
95calm
105calm
115calm
125calm
135calm
145calm
155calm
165calm
175calm
185calm
195calm
205calm
215calm
225calm
235calm
245calm
255calm
265calm
275calm
285calm
295calm
305calm
315calm

Sunrise & sunset in December

DaylightNight

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

Days shrink by about 6 minutes over December. Sunrise moves from 6:39 AM to 6:56 AM, and sunset from 4:38 PM to 4:47 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
110.06:394:38
210.06:404:38
310.06:404:38
49.96:414:38
59.96:424:38
69.96:434:38
79.96:434:38
89.96:444:38
99.96:454:38
109.96:464:38
119.96:464:39
129.96:474:39
139.96:484:39
149.96:484:39
159.86:494:40
169.86:504:40
179.86:504:40
189.86:514:41
199.86:514:41
209.86:524:41
219.86:524:42
229.86:534:42
239.86:534:43
249.86:544:43
259.86:544:44
269.86:544:44
279.86:554:45
289.86:554:46
299.86:554:46
309.96:564:47
319.96:564:47

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 3.11 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 3.11 kWh/m² to a high of 7.93 kWh/m² in June across the year — December's 3.11 kWh/m² sits near the bottom.

01234151015202531
Solar energy (kWh/m²)Level
13.2Moderate
23.2Moderate
33.2Moderate
43.1Moderate
53.1Moderate
63.1Moderate
73.1Moderate
83.1Moderate
93.1Moderate
103.0Moderate
113.0Moderate
123.0Moderate
133.0Moderate
143.0Moderate
153.0Moderate
163.0Moderate
173.0Moderate
183.0Moderate
193.0Moderate
203.0Moderate
213.0Moderate
223.1Moderate
233.1Moderate
243.1Moderate
253.1Moderate
263.1Moderate
273.1Moderate
283.1Moderate
293.1Moderate
303.1Moderate
313.2Moderate
Planning a trip in December

Is December a good time to visit Mira Mesa?

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

6.4
Sightseeing
9th-best month of the year
1.6
Beach & pool
10th-best month of the year

December is a reasonable time to visit Mira Mesa for sightseeing.

What to pack for Mira Mesa in December

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

In December, Mira Mesa sees daytime highs around 63°F and nights near 50°F. Little to plan around — just the basics. About 5 days see rain.

Sea temperature near Mira Mesa in December

The nearest coast averages about 61°F in December — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 14 mi away) is warmest in August at about 70°F and coldest in February near 59°F.

It's comfortable for a long swim from Jul 8 to Oct 6 — about 3 months when the water holds above 68°F.

60°65°70°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingcomfortable to swim
Sea temperature (°F)Comfort
Jan60Cool
Feb59Cool
Mar60Cool
Apr61Cool
May64Cool
Jun66Cool
Jul69Refreshing
Aug70Refreshing
Sep70Refreshing
Oct67Cool
Nov64Cool
Dec61Cool

UV index in Mira Mesa in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 3. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Mira Mesa peaks around June 23 at about 11 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 17 at about 3 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 11 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highExtremeVery highHighModerateJun 23UV 11Dec 17UV 3
UV index (midday)Level
Jan4Moderate
Feb5Moderate
Mar5High
Apr8Very high
May8Very high
Jun11Extreme
Jul11Extreme
Aug10Extreme
Sep8Very high
Oct6High
Nov4Moderate
Dec3Moderate

Air quality in Mira Mesa in December

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where December falls, not just the annual average.

Air quality in Mira Mesa is worst in September — around 26 µg/m³ PM2.5 (moderate), about 3.4× the cleanest month (May, 8 µg/m³).

Modeled monthly averages (CAMS reanalysis, 2015–2024).

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodModerateSep 1625 µg/m³May 168 µg/m³
PM2.5 (µg/m³)Level
Jan12Good
Feb12Moderate
Mar12Moderate
Apr11Good
May8Good
Jun11Good
Jul11Good
Aug15Moderate
Sep26Moderate
Oct14Moderate
Nov12Moderate
Dec16Moderate
Location & terrain

Where is Mira Mesa?

Mira Mesa sits at 32.9°N, 117.1°W, 436 ft above sea level, in United States. The nearest listed city is Rancho Penasquitos, 3.7 mi away.

Topography around Mira Mesa

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

Within 2 miles, the terrain around Mira Mesa has only modest variations in elevation — a maximum elevation change of 614 ft around an average of 404 ft above sea level; within 10 miles, significant variations in elevation — a maximum elevation change of 1,621 ft; within 50 miles, very significant variations in elevation — a maximum elevation change of 6,430 ft.

The land around Mira Mesa is covered by artificial surfaces (64%) within 2 miles, artificial surfaces (36%) and trees (21%) within 10 miles, and water (29%) and shrubs (26%) within 50 miles.

2 miles
614 ft
10 miles
1,621 ft
50 miles
6,430 ft
treesshrubsgrasslandartificial surfacesbare terrainwater
December weather nearby: Rancho Penasquitos 3.7 mi · Poway 6.8 mi · La Jolla 8.7 mi · Santee 11 mi · Encinitas 12 mi · La Mesa 12 mi · El Cajon 14 mi · Lakeside 14 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
Protestant 47%unaffiliated 23%Roman Catholic 21%Jewish 2%

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 Mira Mesa (32.9156°, -117.1439°, elevation 436 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. Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).