Santa Rosa weather in September

In September, Santa Rosa sees average daytime highs of 24°C and overnight lows near 14°C, with 134 mm of rain across 22 wet days and about 11.9 hours of daylight. It is the 1st-warmest and 9th-wettest month of the year here.

Day-to-day highs hold fairly steady near 24°C through the month. The sky is clear or mostly clear about 18% of the time in September, and the air most often feels comfortable.

Daylight stretches from about 11 h 48 min at the start of September to 12 h 06 min by month's end. Set against the rest of the year, September is Santa Rosa's 4th-clearest and 2nd-windiest month. For the whole year in context, see Santa Rosa's year-round climate.

Daytime high: 24°; 1st warmest
Overnight low: 14°; 3rd coldest
Rainfall: 134 mm; 22 wet days
Daylight: 11 h 54 min; 5:56 AM – 5:52 PM
Cloud cover: 64%; 4th clearest
Wind: 3 km/h; 2nd windiest
Solar energy: 5.29 kWh/m²
Travel score: 5.0; out of 10

← August Santa Rosa year-round climate October →Best places to visit in September

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

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 24°C through the month.

A typical September day in Santa Rosa reaches about 24°C in the afternoon and slips back to 14°C overnight — a 10°C spread between the day's warmth and the night's chill. On most days the high lands between 22°C and 26°C. Set against its neighbours, September runs on par with August and on par with October.

	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
Avg high (°C)	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24
Avg low (°C)	14	14	14	14	14	14	14	14	14	14	14	14	14	14	14	14	14	14	14	14	14	14	14	14	14	15	15	15	15	15

	Avg high (°C)	Avg low (°C)
1	24	14
2	24	14
3	24	14
4	24	14
5	24	14
6	24	14
7	24	14
8	24	14
9	24	14
10	24	14
11	24	14
12	24	14
13	24	14
14	24	14
15	24	14
16	24	14
17	24	14
18	24	14
19	24	14
20	24	14
21	24	14
22	24	14
23	24	14
24	24	14
25	24	14
26	24	15
27	24	15
28	24	15
29	24	15
30	24	15

Santa Rosa weather by month

How September compares with the rest of the year at a glance. September is the 1st-warmest and 9th-wettest month here — the current month is highlighted below.

Month	High / Low (°C)	Rainfall (mm)	Wet days	Daylight (hours)	Travel score
Jan	23° / 16°	481	30.3	12.6	3.5
Feb	23° / 16°	443	27.5	12.4	3.4
Mar	23° / 16°	337	30	12.1	3.6
Apr	24° / 15°	220	27.6	11.8	3.9
May	23° / 15°	153	25.4	11.5	4.4
Jun	23° / 14°	98	19.7	11.4	5.3
Jul	23° / 13°	82	16.4	11.4	5.9
Aug	23° / 13°	89	17.4	11.6	5.9
Sep	24° / 14°	134	22	11.9	5.0
Oct	24° / 15°	231	28.5	12.2	3.9
Nov	24° / 16°	317	28.6	12.5	3.6
Dec	23° / 16°	433	30.2	12.6	3.5

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 18% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 25% of September, with mostly cloudy or overcast conditions the remaining 57%. Skies tend to cloud over as the month goes on.

	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
Clearer (%)	63	63	62	61	59	58	57	56	55	52	51	50	48	46	44	41	40	38	36	35	33	32	30	29	28	26	26	25	25	25
Cloudier (%)	37	37	38	39	41	42	43	44	45	48	49	50	52	54	56	59	60	62	64	65	67	68	70	71	72	74	74	75	75	75

	Clearer (%)	Cloudier (%)
1	63	37
2	63	37
3	62	38
4	61	39
5	59	41
6	58	42
7	57	43
8	56	44
9	55	45
10	52	48
11	51	49
12	50	50
13	48	52
14	46	54
15	44	56
16	41	59
17	40	60
18	38	62
19	36	64
20	35	65
21	33	67
22	32	68
23	30	70
24	29	71
25	28	72
26	26	74
27	26	74
28	25	75
29	25	75
30	25	75

Chance of precipitation in September

Any precipitation

Santa Rosa gets around 134 mm of rain over 22 wet days in September. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 74% and peaks near 88% on the wettest days. The odds climb toward the end of the month.

	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
Rain chance (%)	63	64	64	64	65	65	65	65	66	67	68	68	69	71	72	73	74	75	77	78	79	81	82	83	84	85	86	87	88	88

	Rain chance (%)
1	63
2	64
3	64
4	64
5	65
6	65
7	65
8	65
9	66
10	67
11	68
12	68
13	69
14	71
15	72
16	73
17	74
18	75
19	77
20	78
21	79
22	81
23	82
24	83
25	84
26	85
27	86
28	87
29	88
30	88

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the comfortable band about 54% 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
Dry (%)	3	3	3	3	3	3	3	2	2	2	2	2	2	2	2	2	1	1	1	1	1	1	1	1	1	1	1	0	0	0
Comfortable (%)	74	73	72	71	70	69	68	68	67	65	63	62	60	58	56	54	53	51	49	47	45	43	42	40	38	37	35	34	33	32
Humid (%)	23	24	25	26	27	28	29	30	31	33	35	36	38	40	42	44	46	48	50	52	54	56	57	59	61	62	64	66	67	68

	Dry (%)	Comfortable (%)	Humid (%)
1	3	74	23
2	3	73	24
3	3	72	25
4	3	71	26
5	3	70	27
6	3	69	28
7	3	68	29
8	2	68	30
9	2	67	31
10	2	65	33
11	2	63	35
12	2	62	36
13	2	60	38
14	2	58	40
15	2	56	42
16	2	54	44
17	1	53	46
18	1	51	48
19	1	49	50
20	1	47	52
21	1	45	54
22	1	43	56
23	1	42	57
24	1	40	59
25	1	38	61
26	1	37	62
27	1	35	64
28	0	34	66
29	0	33	67
30	0	32	68

Wind in September

Winds average 3 km/h in September.

Across September, daily wind ranges from about 3 km/h on the calmest days to 3 km/h 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
Wind speed (km/h)	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3
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

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

Sunrise & sunset in September

DaylightNight

Daylight runs from about 11 h 48 min at the start of September to 12 h 06 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 18 minutes over September. Sunrise moves from 6:06 AM to 5:46 AM, and sunset from 5:53 PM to 5:51 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
Daylight (h)	11.8	11.8	11.8	11.8	11.8	11.8	11.8	11.9	11.9	11.9	11.9	11.9	11.9	11.9	11.9	11.9	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.1	12.1	12.1	12.1
Sunrise (AM)	6:06	6:05	6:04	6:04	6:03	6:02	6:02	6:01	6:00	6:00	5:59	5:58	5:58	5:57	5:56	5:56	5:55	5:54	5:54	5:53	5:52	5:52	5:51	5:50	5:50	5:49	5:48	5:48	5:47	5:46
Sunset (PM)	5:53	5:53	5:53	5:53	5:53	5:53	5:53	5:53	5:53	5:52	5:52	5:52	5:52	5:52	5:52	5:52	5:52	5:52	5:52	5:52	5:52	5:52	5:52	5:52	5:52	5:52	5:51	5:51	5:51	5:51

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	11.8	6:06	5:53
2	11.8	6:05	5:53
3	11.8	6:04	5:53
4	11.8	6:04	5:53
5	11.8	6:03	5:53
6	11.8	6:02	5:53
7	11.8	6:02	5:53
8	11.9	6:01	5:53
9	11.9	6:00	5:53
10	11.9	6:00	5:52
11	11.9	5:59	5:52
12	11.9	5:58	5:52
13	11.9	5:58	5:52
14	11.9	5:57	5:52
15	11.9	5:56	5:52
16	11.9	5:56	5:52
17	12.0	5:55	5:52
18	12.0	5:54	5:52
19	12.0	5:54	5:52
20	12.0	5:53	5:52
21	12.0	5:52	5:52
22	12.0	5:52	5:52
23	12.0	5:51	5:52
24	12.0	5:50	5:52
25	12.0	5:50	5:52
26	12.0	5:49	5:52
27	12.1	5:48	5:51
28	12.1	5:48	5:51
29	12.1	5:47	5:51
30	12.1	5:46	5:51

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.29 kWh/m² — the sunniest month for solar.

For context, solar energy here swings from a low near 4.11 kWh/m² to a high of 5.29 kWh/m² in September across the year — September's 5.29 kWh/m² sits near the top of that range.

	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
Solar energy (kWh/m²)	5.3	5.3	5.3	5.3	5.3	5.3	5.3	5.3	5.3	5.3	5.3	5.3	5.3	5.3	5.3	5.3	5.3	5.3	5.3	5.3	5.3	5.3	5.3	5.3	5.3	5.3	5.3	5.3	5.3	5.3
Level	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright

	Solar energy (kWh/m²)	Level
1	5.3	Bright
2	5.3	Bright
3	5.3	Bright
4	5.3	Bright
5	5.3	Bright
6	5.3	Bright
7	5.3	Bright
8	5.3	Bright
9	5.3	Bright
10	5.3	Bright
11	5.3	Bright
12	5.3	Bright
13	5.3	Bright
14	5.3	Bright
15	5.3	Bright
16	5.3	Bright
17	5.3	Bright
18	5.3	Bright
19	5.3	Bright
20	5.3	Bright
21	5.3	Bright
22	5.3	Bright
23	5.3	Bright
24	5.3	Bright
25	5.3	Bright
26	5.3	Bright
27	5.3	Bright
28	5.3	Bright
29	5.3	Bright
30	5.3	Bright

Planning a trip in September

Hazard calendar for Santa Rosa

In seasonPeak

None of Santa Rosa's seasonal hazards are active in September. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.

Santa Rosa's rainy season runs October–April, when most of the year's rain falls.

Rainy season

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Is September a good time to visit Santa Rosa?

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

5.0

Sightseeing

4th-best month of the year

4.1

Beach & pool

3rd-best month of the year

September is a reasonable time to visit Santa Rosa for sightseeing.

What to pack for Santa Rosa in September

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

In September, Santa Rosa sees daytime highs around 24°C and nights near 14°C. Pack rain gear. Worth having: light clothes and sun protection. About 22 days see rain.

rain gearlight clothessun protection

UV index in Santa Rosa in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 8 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Santa Rosa peaks around February 11 at about 16 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near September 13 at about 9 (very high).

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)	16	16	15	13	12	10	10	11	8	14	14	15
Level	Extreme	Extreme	Extreme	Extreme	Extreme	Very high	Very high	Extreme	Very high	Extreme	Extreme	Extreme

	UV index (midday)	Level
Jan	16	Extreme
Feb	16	Extreme
Mar	15	Extreme
Apr	13	Extreme
May	12	Extreme
Jun	10	Very high
Jul	10	Very high
Aug	11	Extreme
Sep	8	Very high
Oct	14	Extreme
Nov	14	Extreme
Dec	15	Extreme

Air quality in Santa Rosa in September

GoodModeratePoorUnhealthyVery unhealthy

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

Air quality in Santa Rosa is worst in September — around 29 µg/m³ PM2.5 (moderate), about 3.2× the cleanest month (May, 9 µg/m³).

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

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
PM2.5 (µg/m³)	9	10	11	10	9	9	15	29	29	13	10	9
Level	Good	Good	Good	Good	Good	Good	Moderate	Moderate	Moderate	Moderate	Good	Good

	PM2.5 (µg/m³)	Level
Jan	9	Good
Feb	10	Good
Mar	11	Good
Apr	10	Good
May	9	Good
Jun	9	Good
Jul	15	Moderate
Aug	29	Moderate
Sep	29	Moderate
Oct	13	Moderate
Nov	10	Good
Dec	9	Good

Location & terrain

Where is Santa Rosa?

Santa Rosa sits at 10.9°S, 74.9°W, 524 m above sea level, in Peru. The nearest listed city is Satipo, 46 km away.

Topography around Santa Rosa

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Santa Rosa.

Within 3 km, the terrain around Santa Rosa has significant variations in elevation — a maximum elevation change of 565 m around an average of 617 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,346 m; within 80 km, extreme variations in elevation — a maximum elevation change of 4,742 m.

The land around Santa Rosa is covered by trees (63%) within 3 km, trees (91%) within 16 km, and trees (89%) within 80 km.

3 km

565 m

trees 63%

16 km

1,346 m

trees 91%

80 km

4,742 m

trees 89%

treesgrasslandartificial surfacesbare terrainwater

← August Santa Rosa year-round climate October →Best places to visit in September

September weather nearby: Satipo 46 km · San Martín de Pangoa 71 km · Tarma 104 km · Jauja 116 km · Junín 124 km · Atalaya 125 km · La Oroya 129 km · Huancayo 133 km

Peru travel facts

Travel advisory: Level 2; Exercise Increased Caution
Power plugs: Type A / B / C; 220 V · 60 Hz
Prices: ≈ 51% of US; price level, 2025
GDP per capita: $9,684; 2025
Happiness: 6.0 / 10; World Happiness, 2025
Safe drinking water: 49%; of population, 2024
Homicide rate: 8.6; per 100k, 2021
Road deaths: 13.6; per 100k/yr, 2019
Income group: Upper middle; World Bank
English: Moderate; EF EPI 519
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 Santa Rosa (-10.9191°, -74.885°, elevation 524 m), 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. 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).

	Avg high (°C)	Avg low (°C)
1	24	14
2	24	14
3	24	14
4	24	14
5	24	14
6	24	14
7	24	14
8	24	14
9	24	14
10	24	14
11	24	14
12	24	14
13	24	14
14	24	14
15	24	14
16	24	14
17	24	14
18	24	14
19	24	14
20	24	14
21	24	14
22	24	14
23	24	14
24	24	14
25	24	14
26	24	15
27	24	15
28	24	15
29	24	15
30	24	15

	Clearer (%)	Cloudier (%)
1	63	37
2	63	37
3	62	38
4	61	39
5	59	41
6	58	42
7	57	43
8	56	44
9	55	45
10	52	48
11	51	49
12	50	50
13	48	52
14	46	54
15	44	56
16	41	59
17	40	60
18	38	62
19	36	64
20	35	65
21	33	67
22	32	68
23	30	70
24	29	71
25	28	72
26	26	74
27	26	74
28	25	75
29	25	75
30	25	75

	Rain chance (%)
1	63
2	64
3	64
4	64
5	65
6	65
7	65
8	65
9	66
10	67
11	68
12	68
13	69
14	71
15	72
16	73
17	74
18	75
19	77
20	78
21	79
22	81
23	82
24	83
25	84
26	85
27	86
28	87
29	88
30	88

	Dry (%)	Comfortable (%)	Humid (%)
1	3	74	23
2	3	73	24
3	3	72	25
4	3	71	26
5	3	70	27
6	3	69	28
7	3	68	29
8	2	68	30
9	2	67	31
10	2	65	33
11	2	63	35
12	2	62	36
13	2	60	38
14	2	58	40
15	2	56	42
16	2	54	44
17	1	53	46
18	1	51	48
19	1	49	50
20	1	47	52
21	1	45	54
22	1	43	56
23	1	42	57
24	1	40	59
25	1	38	61
26	1	37	62
27	1	35	64
28	0	34	66
29	0	33	67
30	0	32	68

	Avg high (°C)	Avg low (°C)
1	24	14
2	24	14
3	24	14
4	24	14
5	24	14
6	24	14
7	24	14
8	24	14
9	24	14
10	24	14
11	24	14
12	24	14
13	24	14
14	24	14
15	24	14
16	24	14
17	24	14
18	24	14
19	24	14
20	24	14
21	24	14
22	24	14
23	24	14
24	24	14
25	24	14
26	24	15
27	24	15
28	24	15
29	24	15
30	24	15

	Clearer (%)	Cloudier (%)
1	63	37
2	63	37
3	62	38
4	61	39
5	59	41
6	58	42
7	57	43
8	56	44
9	55	45
10	52	48
11	51	49
12	50	50
13	48	52
14	46	54
15	44	56
16	41	59
17	40	60
18	38	62
19	36	64
20	35	65
21	33	67
22	32	68
23	30	70
24	29	71
25	28	72
26	26	74
27	26	74
28	25	75
29	25	75
30	25	75

	Rain chance (%)
1	63
2	64
3	64
4	64
5	65
6	65
7	65
8	65
9	66
10	67
11	68
12	68
13	69
14	71
15	72
16	73
17	74
18	75
19	77
20	78
21	79
22	81
23	82
24	83
25	84
26	85
27	86
28	87
29	88
30	88

	Dry (%)	Comfortable (%)	Humid (%)
1	3	74	23
2	3	73	24
3	3	72	25
4	3	71	26
5	3	70	27
6	3	69	28
7	3	68	29
8	2	68	30
9	2	67	31
10	2	65	33
11	2	63	35
12	2	62	36
13	2	60	38
14	2	58	40
15	2	56	42
16	2	54	44
17	1	53	46
18	1	51	48
19	1	49	50
20	1	47	52
21	1	45	54
22	1	43	56
23	1	42	57
24	1	40	59
25	1	38	61
26	1	37	62
27	1	35	64
28	0	34	66
29	0	33	67
30	0	32	68

	Avg high (°C)	Avg low (°C)
1	24	14
2	24	14
3	24	14
4	24	14
5	24	14
6	24	14
7	24	14
8	24	14
9	24	14
10	24	14
11	24	14
12	24	14
13	24	14
14	24	14
15	24	14
16	24	14
17	24	14
18	24	14
19	24	14
20	24	14
21	24	14
22	24	14
23	24	14
24	24	14
25	24	14
26	24	15
27	24	15
28	24	15
29	24	15
30	24	15

	Clearer (%)	Cloudier (%)
1	63	37
2	63	37
3	62	38
4	61	39
5	59	41
6	58	42
7	57	43
8	56	44
9	55	45
10	52	48
11	51	49
12	50	50
13	48	52
14	46	54
15	44	56
16	41	59
17	40	60
18	38	62
19	36	64
20	35	65
21	33	67
22	32	68
23	30	70
24	29	71
25	28	72
26	26	74
27	26	74
28	25	75
29	25	75
30	25	75

	Rain chance (%)
1	63
2	64
3	64
4	64
5	65
6	65
7	65
8	65
9	66
10	67
11	68
12	68
13	69
14	71
15	72
16	73
17	74
18	75
19	77
20	78
21	79
22	81
23	82
24	83
25	84
26	85
27	86
28	87
29	88
30	88

	Dry (%)	Comfortable (%)	Humid (%)
1	3	74	23
2	3	73	24
3	3	72	25
4	3	71	26
5	3	70	27
6	3	69	28
7	3	68	29
8	2	68	30
9	2	67	31
10	2	65	33
11	2	63	35
12	2	62	36
13	2	60	38
14	2	58	40
15	2	56	42
16	2	54	44
17	1	53	46
18	1	51	48
19	1	49	50
20	1	47	52
21	1	45	54
22	1	43	56
23	1	42	57
24	1	40	59
25	1	38	61
26	1	37	62
27	1	35	64
28	0	34	66
29	0	33	67
30	0	32	68