United States · 1991–2020

Best time to visit
Riverside (historical).

September leads for comfortable weather in Riverside (historical): typically 22.7°C by day, 7.5°C at night, with 27 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortSeptember

Typical high22.7°C

Typical low7.5°C

Rain in September27 mm

Comfort

September

September · June · August

81climate match

Beach

August

August · July · June

75climate match

Outdoors

September

September · May · June

86climate match

The weakest month is January, scoring 5 against September’s 81 — days reach only -4.7°C, 29° 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

5-4.7° / -15.3°

Feb

5-2.2° / -13.3°

Mar

55.5° / -6.6°

Apr

3713.8° / -0.3°

May

6219.8° / 5.5°

Jun

8024.6° / 10.8°

Jul

7429.7° / 14°

Aug

7729.4° / 13.3°

Sep

8122.7° / 7.5°

Oct

3813.6° / 0.3°

Nov

54.4° / -7.1°

Dec

5-2.6° / -13.1°

Monthly climate evidence for Riverside (historical) — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	-4.7°C	-15.3°C	11 mm	3.5	8 h 45	5	Strong coverage
February	-2.2°C	-13.3°C	9 mm	2.7	10 h 07	5	Strong coverage
March	5.5°C	-6.6°C	12 mm	3.7	11 h 44	5	Strong coverage
April	13.8°C	-0.3°C	26 mm	5.2	13 h 35	37	Strong coverage
May	19.8°C	5.5°C	56 mm	7.6	15 h 10	62	Strong coverage
June	24.6°C	10.8°C	72 mm	9.4	16 h 03	80	Strong coverage
July	29.7°C	14°C	49 mm	6.5	15 h 42	74	Strong coverage
August	29.4°C	13.3°C	32 mm	4.9	14 h 19	77	Strong coverage
September	22.7°C	7.5°C	27 mm	4.3	12 h 31	81	Strong coverage
October	13.6°C	0.3°C	23 mm	4.1	10 h 44	38	Strong coverage
November	4.4°C	-7.1°C	12 mm	3.1	9 h 09	5	Strong coverage
December	-2.6°C	-13.1°C	11 mm	2.8	8 h 21	5	Strong coverage

What has changed

Riverside (historical) runs +1.2°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

+3.5

Feb

-0.3

Mar

+1.2

Apr

0.0

May

+0.6

Jun

+0.7

Jul

+1.9

Aug

+1.5

Sep

+2.9

Oct

-0.2

Nov

+0.6

Dec

+1.8

September daytime highs, 2011–2025. Last recorded: 27.2°C.

Records at GLASGOW, 1948–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	16.1°C8 Jan 2002	-45.6°C26 Jan 1950	18 mm26 Jan 1951	50 mm2011 · driest 0 mm in 1973	79
February	21.7°C27 Feb 1992	-38.9°C2 Feb 1996	16 mm28 Feb 2006	37 mm1952 · driest 1 mm in 2005	79
March	26.1°C23 Mar 1993	-33.9°C6 Mar 1951	21 mm11 Mar 1954	35 mm1954 · driest 1 mm in 1957	79
April	33.9°C26 Apr 1952	-20.0°C2 Apr 1954	34 mm23 Apr 2026	67 mm1955 · driest 0 mm in 1949	79
May	38.9°C18 May 1948	-8.3°C3 May 1954	57 mm29 May 1953	177 mm2011 · driest 1 mm in 1958	79
June	42.2°C5 Jun 1988	-1.1°C1 Jun 1951	65 mm16 Jun 2007	177 mm1950 · driest 2 mm in 1985	79
July	43.3°C19 Jul 2021	5.0°C14 Jul 1977	63 mm13 Jul 1962	151 mm1993 · driest 0 mm in 1984	79
August	42.2°C6 Aug 1949	0.6°C19 Aug 1950	75 mm2 Aug 1985	171 mm2014 · driest 0 mm in 2001	78
September	41.1°C7 Sep 2022	-9.4°C21 Sep 1995	41 mm11 Sep 1978	116 mm2019 · driest 1 mm in 2012	78
October	33.3°C10 Oct 1955	-21.1°C30 Oct 1991	31 mm10 Oct 1998	79 mm2016 · driest 0 mm in 1965	78
November	26.1°C12 Nov 1999	-32.2°C29 Nov 1985	18 mm8 Nov 2020	39 mm1996 · driest 0 mm in 1969	78
December	20.6°C1 Dec 2021	-38.9°C9 Dec 1977	24 mm11 Dec 2025	44 mm2025 · driest 0 mm in 2020	78

Typical days per month at GLASGOW, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	31	0	9
February	0	0	28	<1	7
March	<1	0	28	<1	5
April	2	<1	16	<1	2
May	7	1	4	2	<1
June	15	4	0	2	0
July	27	16	0	1	0
August	25	16	0	<1	0
September	12	5	1	<1	0
October	2	<1	15	<1	2
November	0	0	27	<1	5
December	0	0	31	<1	7

The best month has moved. On the 1961–1990 numbers the strongest month here was June (scoring 86); on 2011–2025 it is September (88). Both are scored the same way, from the same station — only the climate underneath changed.

How often, not how much — every day in GLASGOW’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%	12%	0%	7%	-11.7–0.4°C
February	<1%	10%	<1%	5%	-8.5–3.8°C
March	2%	11%	<1%	7%	-1.8–10.9°C
April	19%	15%	2%	12%	9.8–16.8°C
May	45%	23%	5%	23%	17.2–22.5°C
June	66%	27%	6%	32%	22.7–27.1°C
July	80%	19%	4%	14%	27.5–32.5°C
August	83%	15%	3%	12%	25.6–32.3°C
September	62%	13%	2%	11%	19.3–26.2°C
October	24%	10%	2%	6%	11.4–17.6°C
November	2%	9%	<1%	4%	-0.5–9.3°C
December	0%	11%	<1%	6%	-8.4–2.3°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.

1948Each stripe is one year’s mean temperature against the 78-year average. Warmest: 1987. Coolest: 1950.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 5674035
NOAA station: USW00094008 · GLASGOW
Station distance: 10.4 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 30 usable years
Daylight: Calculated from latitude 48.26°, 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 GLASGOW is what differs

Glasgow→Tampico→Whately→

Or put two places side by side: Riverside (historical) vs Glasgow

Best time to visitRiverside (historical).

September

August

September

The whole year,without the guesswork.

Riverside (historical) runs +1.2°Con the 1961–1990 baseline.

Nearby, measured,and named.

Best time to visit
Riverside (historical).

The whole year,
without the guesswork.

Riverside (historical) runs +1.2°C
on the 1961–1990 baseline.

Nearby, measured,
and named.