Johnston weather in August

In August, Johnston sees average daytime highs of 80°F and overnight lows near 64°F, with 3.8 in of rain across 10.3 wet days and about 13.7 hours of daylight. It is the 2nd-warmest and 4th-wettest month of the year here.

Highs ease over the month, from about 82°F in the first days to 78°F by the end. The sky is clear or mostly clear about 32% of the time in August, and the air most often feels humid.

Daylight stretches from about 14 h 18 min at the start of August to 13 hours by month's end. Set against the rest of the year, August is Johnston's 3rd-clearest and 12th-windiest month. For the whole year in context, see Johnston's year-round climate.

Daytime high
80°
2nd warmest
Overnight low
64°
11th coldest
Rainfall
3.8 in
10.3 wet days
Daylight
13 h 42 min
4:59 AM – 6:41 PM
Cloud cover
57%
3rd clearest
Wind
6 mph
12th windiest
Solar energy
5.21 kWh/m²
Travel score
6.5
out of 10

Temperature in August

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 82°F in the first days to 78°F by the end.

A typical August day in Johnston reaches about 80°F in the afternoon and slips back to 64°F overnight — a 16°F spread between the day's warmth and the night's chill. On most days the high lands between 72°F and 88°F. Set against its neighbours, August runs about 2°F cooler than July and about 7°F warmer than September.

50°60°70°80°90°151015202531
Avg high (°F)Avg low (°F)
18266
28266
38266
48266
58166
68166
78166
88165
98165
108165
118165
128065
138065
148065
158065
168064
178064
188064
198064
208064
217964
227964
237963
247963
257963
267963
277862
287862
297862
307862
317862

How August really feels in Johnston

Once humidity and wind are folded in, August averages 0 days that feel above 90°F and 0 that feel at or below 32°F — the comfort signal a plain temperature reading hides.

Days feeling ≥ 90°F
0
heat index over the day's high
Days feeling ≤ 32°F
0
wind chill below the day's low

August sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Johnston weather by month

How August compares with the rest of the year at a glance. August is the 2nd-warmest and 4th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan37° / 23°3.6105.29.30.0
Feb39° / 24°3.18.64.810.30.0
Mar46° / 31°4.410.74.311.71.2
Apr57° / 41°3.810.80.713.13.9
May67° / 50°3.110.8014.35.9
Jun76° / 60°3.510.10156.7
Jul82° / 66°3.210.6014.76.3
Aug80° / 64°3.810.3013.76.5
Sep73° / 57°3.68.3012.37.0
Oct62° / 47°4.19.30.210.95.4
Nov51° / 37°3.58.80.89.62.7
Dec42° / 29°4.310.4490.3

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 32% of the time in August.

Beyond those clear spells, partly cloudy skies cover about 19% of August, with mostly cloudy or overcast conditions the remaining 48%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15149
25248
35248
45248
55248
65149
75149
85050
94951
104951
114951
124951
134852
144951
154951
164951
174951
185050
195149
205248
215248
225248
235347
245446
255446
265446
275446
285545
295545
305446
315446

Chance of precipitation in August

Any precipitation

Johnston gets around 3.8 in of rain over 10.3 wet days in August. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 33% and peaks near 37% on the wettest days. The odds ease toward the end of the month.

0%10%20%30%40%50%151015202531
Rain chance (%)
136
236
336
436
536
636
737
837
937
1037
1137
1237
1337
1437
1537
1636
1736
1835
1934
2033
2132
2231
2330
2429
2529
2628
2727
2827
2926
3026
3126

Humidity in August

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, August lands in the humid band about 26% of days. Sticky, muggy-or-worse air turns up on roughly 36% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
11219273013
21219263013
31219262913
41319262913
51319262913
61319262913
71319262813
81319262813
91419262813
101419262813
111419262813
121519262713
131519262713
141519262712
151519272712
161520272611
171520282611
181620282610
191621282510
20172128259
21172228249
22182228248
23192327238
24192427228
25202526218
26212526217
27222625207
28222625207
29232724197
30242724197
31242724187

Wind in August

Winds average 6 mph in August, the calmest month.

Across August, daily wind ranges from about 6 mph on the calmest days to 6 mph at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (mph)Feels
16calm
26calm
36calm
46calm
56calm
66calm
76calm
86calm
96calm
106calm
116calm
126calm
136calm
146calm
156calm
166calm
176calm
186calm
196calm
206calm
216calm
226calm
236calm
246calm
256calm
266calm
276calm
286calm
296calm
306calm
316calm

Sunrise & sunset in August

DaylightNight

Daylight runs from about 14 h 18 min at the start of August to 13 hours by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 78 minutes over August. Sunrise moves from 4:44 AM to 5:15 AM, and sunset from 7:01 PM to 6:17 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
114.34:447:01
214.24:457:00
314.24:466:58
414.24:476:57
514.14:486:56
614.14:496:55
714.14:506:54
814.04:516:52
914.04:526:51
1013.94:536:50
1113.94:546:48
1213.94:556:47
1313.84:566:45
1413.84:576:44
1513.74:586:43
1613.74:596:41
1713.75:006:40
1813.65:016:38
1913.65:026:37
2013.55:036:35
2113.55:046:34
2213.45:056:32
2313.45:076:30
2413.45:086:29
2513.35:096:27
2613.35:106:25
2713.25:116:24
2813.25:126:22
2913.15:136:20
3013.15:146:19
3113.05:156:17

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 5.21 kWh/m².

For context, solar energy here swings from a low near 1.66 kWh/m² to a high of 5.93 kWh/m² in June across the year — August's 5.21 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
15.5Bright
25.5Bright
35.5Bright
45.4Bright
55.4Bright
65.4Bright
75.4Bright
85.3Bright
95.3Bright
105.3Bright
115.3Bright
125.2Bright
135.2Bright
145.2Bright
155.2Bright
165.2Bright
175.1Bright
185.1Bright
195.1Bright
205.1Bright
215.1Bright
225.1Bright
235.1Bright
245.0Bright
255.0Bright
265.0Bright
275.0Bright
284.9Bright
294.9Bright
304.8Bright
314.8Bright
Planning a trip in August

Hazard calendar for Johnston

In seasonPeak

In August, Johnston sits inside its atlantic hurricane season. The full year is below, with each hazard's peak months called out.

Johnston sits in the Atlantic hurricane belt; the season peaks August–October.

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

Is August a good time to visit Johnston?

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

6.5
Sightseeing
3rd-best month of the year
6.5
Beach & pool
2nd-best month of the year

August is a reasonable time to visit Johnston for sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Johnston in August

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

In August, Johnston sees daytime highs around 80°F and nights near 64°F. Worth packing: light clothes, rain gear and sun protection. About 10 days see rain.

light clothesrain gearsun protection

Sea temperature near Johnston in August

The nearest coast averages about 69°F in August — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 32 mi away) is warmest in August at about 69°F and coldest in February near 39°F.

It's comfortable for a long swim from Jul 29 to Aug 30 — about 1.1 months when the water holds above 68°F.

40°50°60°70°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarm
Sea temperature (°F)Comfort
Jan43Bracing
Feb39Bracing
Mar40Bracing
Apr44Bracing
May51Bracing
Jun60Cool
Jul67Cool
Aug69Refreshing
Sep67Cool
Oct62Cool
Nov55Bracing
Dec48Bracing

UV index in Johnston in August

LowModerateHighVery highExtreme

Clear-sky midday UV in August peaks around 5 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Johnston peaks around July 10 at about 8 (very high) — sunscreen and a hat are worth it in the middle of the day. It bottoms out near January 1 at about 1 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 8 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighVery highHighModerateLowJul 10UV 8Jan 1UV 1
UV index (midday)Level
Jan1Low
Feb3Moderate
Mar4Moderate
Apr5High
May8Very high
Jun7Very high
Jul8Very high
Aug5Moderate
Sep6High
Oct3Moderate
Nov2Moderate
Dec1Low

Air quality in Johnston in August

GoodModeratePoorUnhealthyVery unhealthy

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

Air quality in Johnston is worst in July — around 16 µg/m³ PM2.5 (moderate), about 1.9× the cleanest month (November, 8 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1516 µg/m³Nov 189 µg/m³
PM2.5 (µg/m³)Level
Jan10Good
Feb13Moderate
Mar14Moderate
Apr14Moderate
May15Moderate
Jun15Moderate
Jul16Moderate
Aug14Moderate
Sep12Good
Oct10Good
Nov8Good
Dec10Good
Location & terrain

Where is Johnston?

Johnston sits at 41.8°N, 71.5°W, 82 ft above sea level, in United States. The nearest listed city is North Providence, 3.1 mi away.

Topography around Johnston

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

Within 2 miles, the terrain around Johnston has only modest variations in elevation — a maximum elevation change of 492 ft around an average of 266 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 797 ft; within 50 miles, large variations in elevation — a maximum elevation change of 2,198 ft.

The land around Johnston is covered by trees (68%) within 2 miles, trees (67%) within 10 miles, and trees (67%) and water (24%) within 50 miles.

2 miles
492 ft
10 miles
797 ft
50 miles
2,198 ft
treesgrasslandcroplandartificial surfacesbare terrainwater
August weather nearby: North Providence 3.1 mi · Cranston 4.3 mi · Providence 5.0 mi · East Providence 6.8 mi · Smithfield 7.5 mi · Pawtucket 7.5 mi · Central Falls 7.5 mi · Lincoln 8.1 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 Johnston (41.8219°, -71.5067°, elevation 82 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. Tropical-cyclone seasons are the published climatological basin seasons (NOAA National Hurricane Center / regional warning centres). 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).