The Frontier Gazette & Almanack
“Fair Warning for Every Town Under the Sky” · Est. 1881
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Arco-Íris Weather in September

Arco-Íris in September

The short of it: Arco-Íris in September averages a high of 29 °C (85 °F) and a low of 16 °C (60 °F), with 39 mm (1.5 in) of rain and about 12 h 0 min of daylight. Rated 4 of 5 for a visit; the best months are June and July. Source: TerraClimate climate normals, 1991–2020.

Average high 29° · low 16° · rain 39 mm · daylight 12 h 0 min

✦✦✦✦ Recommended for a visit · best months: June & July

September in Arco-Íris brings afternoons near 29° and nights around 16°, with about 39 mm of rain over the month. Much like August: highs about 29°, nights near 16°. Easy travelling weather. Rain is modest, about 39 mm, the 9th wettest month.

The sun is up for about 12 h 0 min in mid-September, 38 minutes more than a month before.

For the traveller: pack linen, a wide hat and water. The Almanac rates September 4 of 5 for a visit; the finest months here are June and July.

Against its neighbours, Arco-Íris runs warmer than most and wetter than most in September. Santópolis do Aguapeí, 15 km to the NNW, sees much the same highs.

September in Arco-Íris, by the numbers

Warmth rank
7th warmest of 12
Rain rank
9th wettest of 12
Versus August
2° warmer, 19 mm more rain
Versus October
1° colder
Day–night spread
14°
Snow season
seldom any
Daylight, mid-month
12 h 0 min
Average wind
10 km/h

Neighbouring Towns

September averages · distance by the crow’s flight
TownDistanceHighLowRain
Santópolis do AguapeíSão Paulo15 km NNW29°16°37 mm
LuiziâniaSão Paulo18 km NE29°16°36 mm
TupãSão Paulo19 km SSW29°15°47 mm
QueirozSão Paulo23 km E29°15°38 mm
ClementinaSão Paulo24 km N29°16°37 mm
PiacatuSão Paulo24 km NW29°16°37 mm
IacriSão Paulo25 km WSW29°15°45 mm
HerculândiaSão Paulo27 km SSE29°15°46 mm

The Almanac · Arco-Íris Month by Month

Climate normals 1991–2020 · pick a month
PrecipitationAverage highAverage low
Recommended
The Almanac Speaks
September
✦✦✦✦✦

Much like August: highs about 29°, nights near 16°. Easy travelling weather. Rain is modest, about 39 mm, the 9th wettest month.

Climate of Arco-Íris by month
MonthHighLowRainWindDaylightVisit
January31°20°259 mm9 km/h13 h 19 min✦✦
February30°20°222 mm8 km/h12 h 51 min✦✦
March30°19°121 mm8 km/h12 h 16 min✦✦
April29°16°54 mm8 km/h11 h 37 min✦✦✦✦
May25°13°56 mm8 km/h11 h 5 min✦✦✦✦
June25°12°39 mm8 km/h10 h 49 min✦✦✦✦✦
July26°11°24 mm9 km/h10 h 55 min✦✦✦✦✦
August27°13°20 mm10 km/h11 h 22 min✦✦✦✦✦
September29°16°39 mm10 km/h12 h 0 min✦✦✦✦
October30°17°119 mm10 km/h12 h 38 min✦✦
November30°19°117 mm10 km/h13 h 11 min✦✦
December31°19°152 mm9 km/h13 h 27 min✦✦

Questions Readers Ask about Arco-Íris in September

Answered from the wire & the Almanac

What is the weather like in Arco-Íris in September?

Days average 29 °C (85 °F) and nights 16 °C (60 °F), with about 39 mm (1.5 in) of rain over the month. Much like August: highs about 29°, nights near 16°. Easy travelling weather. Rain is modest, about 39 mm, the 9th wettest month.

Is September a good time to visit Arco-Íris?

The Almanac gives September 4 of 5 (recommended). The best months are June and July.

How long are the days in Arco-Íris in September?

In mid-September the sun is up for about 12 h 0 min. The days are lengthening — from 10 h 49 min in June to 13 h 27 min in December.

Does it snow in Arco-Íris in September?

Hardly — September nights average 16 °C (60 °F), above freezing.

What should I pack for Arco-Íris in September?

Linen, a wide hat, sun cream and water.

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The Editor’s Remark

“Weather is the only news that never grows stale. Each morning the sky writes its own front page, and we at Wanted Weather are but its telegraph operators.”— J. Whitmore, Editor
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