United States · 1991–2020

Best time to visit
National City.

October leads for comfortable weather in National City: typically 24.4°C by day, 14.6°C at night, with 7 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortOctober

Typical high24.4°C

Typical low14.6°C

Rain in October7 mm

Comfort

October

October · July · June

98climate match

Beach

August

August · September · July

83climate match

Outdoors

March

March · April · December

98climate match

The weakest month is February, scoring 70 against October’s 98 — days reach only 19.7°C, 4° below the 24°C the score treats as ideal, and nights drop to 9.1°C.

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

7220.1° / 8°

Feb

7019.7° / 9.1°

Mar

7820° / 10.6°

Apr

8320.7° / 11.9°

May

8921.1° / 14.4°

Jun

9222.1° / 16.2°

Jul

9424.2° / 18.2°

Aug

8825.5° / 18.8°

Sep

8825.9° / 17.9°

Oct

9824.4° / 14.6°

Nov

8622.4° / 10.4°

Dec

7219.7° / 7.9°

Monthly climate evidence for National City — daylight is calculated from latitude, everything else is measured, sea temperature from the nearest open water 6 km away
Month	Day	Night	Rain	Wet days	Sea	Daylight	Comfort	Coverage
January	20.1°C	8°C	46 mm	4.4	15.3°C	10 h 13	72	Strong coverage
February	19.7°C	9.1°C	58 mm	5.3	15.1°C	10 h 58	70	Strong coverage
March	20°C	10.6°C	35 mm	3.6	15.5°C	11 h 53	78	Strong coverage
April	20.7°C	11.9°C	17 mm	2.3	16.1°C	12 h 56	83	Strong coverage
May	21.1°C	14.4°C	6 mm	1	17.3°C	13 h 49	89	Strong coverage
June	22.1°C	16.2°C	1 mm	0.2	18.6°C	14 h 17	92	Strong coverage
July	24.2°C	18.2°C	2 mm	0.2	20.2°C	14 h 06	94	Strong coverage
August	25.5°C	18.8°C	0 mm	0.2	21.0°C	13 h 21	88	Strong coverage
September	25.9°C	17.9°C	2 mm	0.3	20.5°C	12 h 20	88	Strong coverage
October	24.4°C	14.6°C	7 mm	0.9	19.3°C	11 h 19	98	Strong coverage
November	22.4°C	10.4°C	18 mm	2.3	17.5°C	10 h 26	86	Strong coverage
December	19.7°C	7.9°C	34 mm	3.7	16.0°C	10 h 01	72	Strong coverage

What has changed

National City runs +1.6°C
on the 1961–1990 baseline.

Each bar compares the 2011–2025 daytime average for that month against the same month in 1961–1990, measured at the same station. Months where the older record is too thin to compare are left blank.

Jan

+1.4

Feb

+0.8

Mar

+1.4

Apr

+1.4

May

+1.4

Jun

+1.6

Jul

+1.7

Aug

+1.9

Sep

+2.4

Oct

+2.0

Nov

+1.8

Dec

+1.2

October daytime highs, 2011–2025. Last recorded: 25.2°C.

Records at CHULA VISTA, 1918–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	32.2°C31 Jan 2003	-4.4°C14 Jan 1963	54 mm30 Jan 1986	210 mm1993 · driest 0 mm in 2006	107
February	33.9°C12 Feb 2022	-1.7°C19 Feb 1990	66 mm6 Feb 1937	197 mm1998 · driest 0 mm in 1984	108
March	35.0°C26 Mar 1988	0.0°C2 Mar 1971	73 mm9 Mar 1968	188 mm1983 · driest 0 mm in 1956	107
April	38.9°C6 Apr 1989	2.2°C4 Apr 1945	46 mm1 Apr 1941	123 mm1941 · driest 0 mm in 1961	106
May	36.7°C15 May 2014	5.0°C10 May 1922	42 mm5 May 1921	69 mm1921 · driest 0 mm in 2010	107
June	36.1°C27 Jun 2006	6.1°C21 Jun 1984	10 mm5 Jun 1993	15 mm1990 · driest 0 mm in 1985	106
July	37.8°C24 Jul 2006	10.6°C5 Jul 1940	22 mm19 Jul 2015	30 mm2015 · driest 0 mm in 1975	107
August	35.6°C8 Aug 1936	11.7°C26 Aug 1928	49 mm17 Aug 1977	51 mm1977 · driest 0 mm in 1927	106
September	42.2°C27 Sep 1963	6.1°C3 Sep 1999	31 mm25 Sep 1997	74 mm1939 · driest 0 mm in 2006	107
October	41.1°C3 Oct 1987	2.2°C29 Oct 1971	73 mm4 Oct 1925	100 mm1925 · driest 0 mm in 2003	107
November	36.7°C9 Nov 2016	0.6°C23 Nov 1931	55 mm24 Nov 1985	207 mm1985 · driest 0 mm in 1980	107
December	30.0°C29 Dec 1963	-2.2°C25 Dec 1987	93 mm24 Dec 1940	210 mm1921 · driest 0 mm in 1999	106

Typical days per month at CHULA VISTA, 1991–2020
Month	Days 25°C+	Days 30°C+	Heavy rain (10 mm+)
January	4	<1	2
February	3	<1	2
March	3	<1	1
April	3	<1	<1
May	2	<1	<1
June	3	<1	0
July	10	<1	<1
August	16	2	0
September	15	3	0
October	9	3	<1
November	6	1	<1
December	2	0	1

The best month has moved. On the 1961–1990 numbers the strongest month here was September (scoring 96); on 2011–2025 it is October (98). Both are scored the same way, from the same station — only the climate underneath changed.

How often, not how much — every day in CHULA VISTA’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	26%	16%	5%	16%	15.8–21.2°C
February	25%	18%	6%	18%	15.8–20.5°C
March	24%	15%	4%	14%	16.2–20.9°C
April	30%	10%	2%	6%	17.1–21.7°C
May	40%	3%	<1%	1%	17.9–21.9°C
June	63%	1%	<1%	0%	18.9–23.0°C
July	94%	<1%	<1%	<1%	20.8–24.6°C
August	99%	<1%	<1%	0%	21.7–26.6°C
September	94%	2%	<1%	<1%	21.3–26.8°C
October	78%	5%	1%	2%	20.3–25.7°C
November	53%	9%	3%	7%	18.6–23.4°C
December	29%	15%	4%	16%	16.5–20.8°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.

1919Each stripe is one year’s mean temperature against the 95-year average. Warmest: 2014. Coolest: 1933.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 5376200
NOAA station: USC00041758 · CHULA VISTA
Station distance: 4.4 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 26 usable years
Daylight: Calculated from latitude 32.68°, mid-month, sunrise to sunset including refraction. Not a station measurement.
Sea temperature: NOAA OISST v2.1 1991–2020 monthly climatology, nearest open water 6 km from the place centre. A sheltered bay can run warmer than the open sea it is measured from.
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 CHULA VISTA is what differs

Chula Vista→Bonita→Boal→Castle Park→Chollas View→Fruitdale→

Or put two places side by side: National City vs Chula Vista

Best time to visitNational City.

October

August

March

The whole year,without the guesswork.

National City runs +1.6°Con the 1961–1990 baseline.

Nearby, measured,and named.

Best time to visit
National City.

The whole year,
without the guesswork.

National City runs +1.6°C
on the 1961–1990 baseline.

Nearby, measured,
and named.